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EK-VR320-SV-001

April 1990

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Document:	VR320 Monitor Service Guide
Order Number:	EK-VR320-SV
Revision:	001
Pages:	102
Original Filename:

OCR Text

VR320 Monitor Service Guide
Order Number EK-VR320-SV-001

Digital Equipment Corporation

First edition, April 1990
The information in this document is subject to change without notice and should not
be construed as a commitment by Digital Equipment Corporation. Digital Equipment
Corporation assumes no responsibility for any errors that may appear in this document.
The software described in this document is furnished under a license and may be used or
copied only in accordance with the terms of such license.
No responsibility is assumed for the use or reliability of software on equipment that is not
supplied by Digital Equipment Corporation or its affiliated companies.
Restricted Rights: Use, duplication, or disclosure by the U. S. Government is subject to
restrictions as set forth in subparagraph ( c ) ( 1 ) ( ii ) of the Rights in Technical Data and
Computer Software clause at DFARS 252.227–7013.
Copyright © Digital Equipment Corporation 1990
All Rights Reserved.
Printed in U.S.A.

The following are trademarks of Digital Equipment Corporation:
DEC
DEC/CMS
DEC/MMS
DECnet
DECsystem–10
DECSYSTEM–20
DECUS
DECwriter

DIBOL
EduSystem
IAS
MASSBUS
PDP
PDT
RSTS
RSX

UNIBUS
VAX
VAXcluster
VMS
VT

This document was prepared and published by Educational Services Development and
Publishing, Digital Equipment Corporation.

Contents
About This Manual
1

Overview

1.1
Product Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.1.1
Refresh Rate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.1.2
Model Variations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.2
Tools and Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.3
Recommended Spare Parts . . . . . . . . . . . . . . . . . . . . . . . . . . .

2
2.1
2.2
2.3

1–1
1–2
1–2
1–2
1–3

Troubleshooting
Before You Start . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Troubleshooting Procedures . . . . . . . . . . . . . . . . . . . . . . . . . .
Troubleshooting Tables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2–1
2–1
2–2

Removing and Replacing FRUs

3.1
Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.1.1
Rear Cover Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.1.2
Top Cover Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.2
Field Replaceable Units (FRUs) . . . . . . . . . . . . . . . . . . . . . . .
3.2.1
Interconnect Cable Removal . . . . . . . . . . . . . . . . . . . . . . . .
3.2.2
Deflection Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.2.3
Discharging the CRT . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.2.4
Power Supply Module Removal . . . . . . . . . . . . . . . . . . . . .
3.2.5
Power Supply Module Replacement . . . . . . . . . . . . . . . . . .
3.2.6
Video Casting Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.2.7
CRT/Chassis Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.3
CRT Disposal (Trained Service Personnel Only) . . . . . . . . . .

3–1
3–2
3–6
3–8
3–9
3–10
3–14
3–18
3–27
3–30
3–35
3–35
iii

iv Contents

Aligning the Video Monitor

4.1
4.1.1
4.1.2
4.2
4.3
4.4
4.5
4.5.1
4.5.2
4.5.3
4.5.4

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Before You Start . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Displaying Screen Tests . . . . . . . . . . . . . . . . . . . . . . . . . . .
Monitor Adjustments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Using the Radiance Meter . . . . . . . . . . . . . . . . . . . . . . . . . . .
Color Adjustments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Deflection Adjustments . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Vertical Linearity (VLIN) . . . . . . . . . . . . . . . . . . . . . . . . .
Vertical Centering (VCEN) . . . . . . . . . . . . . . . . . . . . . . . . .
Height (HEIGHT) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Horizontal Phase, Horizontal Linearity, and Horizontal
Centering (HPHASE, HLIN, HCEN) . . . . . . . . . . . . . . . . .
4.5.5
Horizontal Width (WIDTH) . . . . . . . . . . . . . . . . . . . . . . . .
4.5.20 Side Pincushioning (PIN) . . . . . . . . . . . . . . . . . . . . . . . . . .
4.5.7
Trapezoid (TRAP) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.5.8
Focus (FOCUS1, FOCUS2, DYN PHASE, HPARAB,
VPARAB) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4–1
4–1
4–2
4–3
4–4
4–6
4–13
4–16
4–17
4–18
4–19
4–21
4–23
4–25
4–27

Changing Refresh Rates

5.1
5.2
5.3

Refresh Rates of VR320 Monitors . . . . . . . . . . . . . . . . . . . . .
Changing the Refresh Rate . . . . . . . . . . . . . . . . . . . . . . . . . .
Product Variation Label . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Alignment Screens

A.1
A.2
A.3
A.4
A.5
A.6

Circle-Crosshatch Pattern . . . . . . . . . . . . . . . . . . . . . . . . . . .
All-White Pattern . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Central Rectangle Pattern . . . . . . . . . . . . . . . . . . . . . . . . . . .
All Es Pattern . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Color Bars I Pattern . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Color Bars II Pattern . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5–1
5–1
5–2

A–1
A–2
A–3
A–4
A–5
A–5

Contents v

VR320 Documentation

Index
Figures
1–1
3–1
3–2
3–3
3–4
3–5
3–6
3–7
3–8
3–9
3–10
3–11
3–12
3–13
3–14
3–15
3–16
3–17
3–18
3–19
3–20
3–21
3–22
3–23
3–24
3–25
3–26
3–27
3–28
3–29

VR320 Color Monitor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Power Switch/Indicator . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Removing the Power Cord . . . . . . . . . . . . . . . . . . . . . . . . . . .
Removing the Signal Cables . . . . . . . . . . . . . . . . . . . . . . . . . .
Removing the Rear Cover . . . . . . . . . . . . . . . . . . . . . . . . . . .
Tilting the Top Cover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Removing the Top Cover . . . . . . . . . . . . . . . . . . . . . . . . . . . .
VR320 Field Replaceable Units . . . . . . . . . . . . . . . . . . . . . . .
Removing the Interconnect Cable . . . . . . . . . . . . . . . . . . . . .
Removing the Cable from the Deflection Module . . . . . . . . . .
Disconnecting Cables from the Deflection Module . . . . . . . . .
Removing the Deflection Module . . . . . . . . . . . . . . . . . . . . . .
Refresh Rate Switch on the Deflection Module . . . . . . . . . . .
Removing the CRT Anode Cable from the Clamp . . . . . . . . .
Discharging and Removing the CRT Anode . . . . . . . . . . . . .
Removing the Interconnect Cable from the Power Supply . . .
Removing the Dynamic Focus Cable . . . . . . . . . . . . . . . . . . .
Removing the Degauss Cable from the Power Supply . . . . . .
Loosening the Power Supply Screws . . . . . . . . . . . . . . . . . . .
Sliding the Power Supply Out (Partially) . . . . . . . . . . . . . . . .
Removing the LED Cable from the Power Supply . . . . . . . . .
Disconnecting the Focus Pack and Focus Cables . . . . . . . . . .
Removing the Power Supply . . . . . . . . . . . . . . . . . . . . . . . . .
Removing the Focus Wires . . . . . . . . . . . . . . . . . . . . . . . . . . .
Refresh Rate Jumper on the Power Supply . . . . . . . . . . . . . .
Attaching the Focus Wires to the Power Supply . . . . . . . . . .
Removing Cables from the Video Casting . . . . . . . . . . . . . . .
Removing the Plug from the Video Casting . . . . . . . . . . . . . .
Removing the CRT Socket Connector . . . . . . . . . . . . . . . . . . .
Removing the Video Casting . . . . . . . . . . . . . . . . . . . . . . . . .

1–1
3–2
3–3
3–4
3–5
3–6
3–7
3–8
3–9
3–10
3–11
3–12
3–13
3–15
3–17
3–18
3–19
3–20
3–21
3–22
3–23
3–24
3–25
3–26
3–27
3–28
3–31
3–32
3–33
3–34

vi Contents

3–30
4–1
4–2
4–3
4–4
4–5
4–6
4–7
4–8
4–9
4–10
4–11
4–12
4–13
4–14
4–15
4–16
4–17
4–18
4–19
4–20
4–21
4–22
4–23
4–24
4–25
5–1
A–1
A–2
A–3
A–4
A–5
A–6

Crushing the Evacuation Point . . . . . . . . . . . . . . . . . . . . . . .
User Adjustments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Radiance Meter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Using the Radiance Meter . . . . . . . . . . . . . . . . . . . . . . . . . .
Color Adjustment Controls . . . . . . . . . . . . . . . . . . . . . . . . . . .
G2 Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Brightness and Contrast Controls . . . . . . . . . . . . . . . . . . . . .
Service Switch and Blue and Red Cutoff . . . . . . . . . . . . . . . .
Setting Service Switch to Normal Position . . . . . . . . . . . . . . .
Blue, Green, and Red Gain Controls . . . . . . . . . . . . . . . . . . .
Location of Deflection Adjustments . . . . . . . . . . . . . . . . . . . .
Using the Metric Measuring Tape . . . . . . . . . . . . . . . . . . . . .
Circle-Crosshatch Pattern . . . . . . . . . . . . . . . . . . . . . . . . . . .
VCEN, VHOLD, and VLIN Controls . . . . . . . . . . . . . . . . . . .
Vertical Height Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
HPHASE, HLIN, and HCEN Controls . . . . . . . . . . . . . . . . . .
Measuring the Width of the Viewing Area . . . . . . . . . . . . . .
Horizontal Width Control . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Video Area on Screen Bowed Out . . . . . . . . . . . . . . . . . . . . . .
Video Area on Screen Bowed In . . . . . . . . . . . . . . . . . . . . . . .
Pincushion Adjustment (PIN) . . . . . . . . . . . . . . . . . . . . . . . .
Screen Wider at Top . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Screen Wider at Bottom . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Trapezoid Adjustment (TRAP) . . . . . . . . . . . . . . . . . . . . . . . .
Focus Adjustment Controls . . . . . . . . . . . . . . . . . . . . . . . . . .
Circle-Crosshatch Screen . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Product Variation Label . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Circle-Crosshatch Pattern . . . . . . . . . . . . . . . . . . . . . . . . . . .
All-White Pattern . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Central Rectangle Pattern . . . . . . . . . . . . . . . . . . . . . . . . . . .
All Es Pattern . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Color Bars I Pattern . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Color Bars II Pattern . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3–38
4–3
4–4
4–5
4–6
4–7
4–8
4–9
4–11
4–12
4–13
4–15
4–16
4–17
4–18
4–20
4–21
4–22
4–23
4–23
4–24
4–25
4–25
4–26
4–27
4–28
5–3
A–1
A–2
A–3
A–4
A–5
A–5

Contents vii

Tables
1–1
1–2
1–3
2–1
2–2
2–3
2–4
2–5
5–1
5–2

Refresh Rates of Monitor Models . . . . . . . . . . . . . . . . . . . . . .
Tools and Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
VR320 Recommended Spare Parts . . . . . . . . . . . . . . . . . . . . .
Blank Screen, No Video or Raster . . . . . . . . . . . . . . . . . . . . .
Blank Screen, No Video but Raster Present . . . . . . . . . . . . . .
Loss of Synchronization . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Color Problems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Poor Display Quality: Color, Brightness, Geometry, or Focus
Refresh Rates of Monitor Models . . . . . . . . . . . . . . . . . . . . . .
Product Variation Label Information . . . . . . . . . . . . . . . . . . .

1–2
1–2
1–3
2–3
2–4
2–5
2–6
2–8
5–1
5–2

About This Manual
This guide describes how to service your VR320 monitor.

Guide Organization
This guide covers the following topics:
•

Chapter 1 provides a general overview of the product and includes a
list of spare parts.

•

Chapter 2 describes the troubleshooting procedures.

•

Chapter 3 provides the removing and replacing procedures for the
Field Replaceable Units (FRUs).

•

Chapter 4 describes the alignment procedures.

•

Chapter 5 describes the procedures to change the refresh rate of the
monitor.

•

Appendix A describes the alignment screens.

•

Appendix B describes related documentation.

Audience
The procedures in this guide are for service technicians trained only by
Digital Equipment Corporation.

Conventions
Warning

Provides information to prevent personal injury.

Caution

Provides information to prevent damage to the equipment.

Note

Provides general information you should be aware of.

Part number.

1
Overview
1.1 Product Description
The VR320 color monitor (Figure 1–1) has a direct viewed, 485 mm,
antiglare CRT with contrast enhancement. The built-in tilt-swivel
assembly lets the user adjust the screen for viewing comfort. When
connected to a host system, the monitor can display information sent to
the host system and information the host system sends to it.

MA-0244-90.DG

Figure 1–1

VR320 Color Monitor
1–1

1–2 Overview

1.1.1 Refresh Rate
The monitor operates at a refresh rate of either 66 Hz or 72 Hz. It is
preset for the system as ordered. If you change the monitor to another
system, check the refresh rate of the new system and then set the switch
on the deflection module and the jumper on the power supply module to
match the new system. Refer to Chapter 5.

1.1.2 Model Variations
Table 1–1 lists the different VR320 models and their refresh rates.
Table 1–1 Refresh Rates of Monitor Models
Model

Pixels x Lines

Refresh Rate

Applicable Area

VR320-CA

1280 x 1024

66 Hz

Northern Hemisphere

VR320-C4

1280 x 1024

66 Hz

Southern Hemisphere

VR320-DA

1280 x 1024

72 Hz

Northern Hemisphere

VR320-D4

1280 x 1024

72 Hz

Southern Hemisphere

1.2 Tools and Equipment
You need the following tools and equipment to service the VR320
monitor:
Table 1–2 Tools and Equipment
Tools and Equipment

Part Number

Terminal Technician Tool Kit

29-27340-01

Static protection kit

29-26246-00

Anode discharge tool

29-24717-00

Metric measuring tape

29-25342-00

Safety goggles

29-16141-00

Gloves

29-16146-00

Overview 1–3

1.3 Recommended Spare Parts
The following are the recommended spare parts for the VR320 monitor:
Table 1–3 VR320 Recommended Spare Parts
Spares

Part Number

Power supply module

54-19621-01

Deflection module

54-19301-01

Video casting assembly

70-27010-01

Interconnect cable

70-27000-01

CRT/chassis assembly

70-27429-03

CRT/chassis assembly

70-27429-04

2
Troubleshooting
This chapter describes how to troubleshoot a VR320 monitor problem
through fault isolation.

2.1 Before You Start
The following information will help you troubleshoot the monitor easily
and effectively:
WARNING
If you smell burning components, press the monitor power switch
to off and disconnect the power cord.
•

If you are going to service a display quality type of problem, tell
the customer to let the monitor warm up for at least 20 minutes, if
possible, before you arrive and begin the troubleshooting procedures.

•

Magnetic fields affect monitor performance and can give a false
indication of a monitor failure. Place the monitor away from any
electromagnetic devices, such as printers and terminals, or away from
large magnetized objects, such as filing cabinets and steel beams in
walls.

NOTE
Any time you replace a video casting assembly, deflection module,
or power supply module, perform all the necessary adjustments.
Refer to Chapter 3.

2.2 Troubleshooting Procedures
These procedures assume that only one assembly has failed or only one
problem exists. Always troubleshoot the most obvious symptom first.
However, one symptom may indicate multiple failures. Problems may
come from either the host system or the monitor.

2–1

2–2 Troubleshooting

Troubleshoot the VR320 monitor as follows:
1. Ask the operator to describe the problem. The operator often is the
most knowledgeable person.
2. Identify the problem. The screen display often indicates which
problem is occurring.
3. Isolate the problem. Refer to the troubleshooting tables to find the
suggested solutions.
4. Display the host system alignment test patterns to make sure that
no other problem exists. Refer to the host system service guide for
displaying test patterns.

2.3 Troubleshooting Tables
The troubleshooting tables list the possible cause in order of probability.
This troubleshooting information applies to the following types of video
problems your VR320 monitor may exhibit:
•

A blank screen, without video or raster (Table 2–1)

•

A blank screen, without video, but raster present (Table 2–2)

•

Loss of synchronization (Table 2–3)

•

Color problems (Table 2–4)

•

Poor display quality: color, brightness, geometry, or focus (Table 2–5)

Use the troubleshooting tables as follows:
1. Note the general symptom of the problem.
2. Check the Symptom column for a match.
3. Check the conditions in the Possible Cause column in the order given.
4. Perform the action in the Suggested Solution column in the order
given.
NOTE
Any time you replace a video casting assembly, deflection module,
or power supply module, perform all the necessary adjustments.
Refer to Chapter 3.

Troubleshooting 2–3

Table 2–1 Blank Screen, No Video or Raster
Symptom

Possible Cause

Suggested Solution

Blank screen, no
video or raster.
Power to the monitor
is on (power switch
is in), but power
indicator is off.

Power cord is not
connected.

Connect the power cord to
the power source or monitor.

Low or no power
at wall outlet.

Use another power source. If
the problem continues, call
the facilities person.

Power supply module
is faulty.

Replace the power supply
module (Section 3.2.4).

Deflection module is
faulty.

Replace the deflection module
(Section 3.2.2).

Video module is faulty.

Replace the video casting
assembly (Section 3.2.6).

Brightness or contrast
control is set too low.

Adjust the brightness and
contrast controls.

Internal cabling is
loose or faulty.

Check all cabling connected
to the deflection module and
the video casting assembly,
including the CRT socket. If
necessary, secure the cables.

Cutoff is set
improperly.

Perform the cutoff alignment
procedures (Section 4.4).

Deflection module is
faulty.

Replace the deflection module
(Section 3.2.2).

Video casting
assembly is faulty.

Replace the video casting
assembly (Section 3.2.6).

Power supply module
is faulty.

Replace the power supply
module (Section 3.2.4).

CRT/chassis assembly
is faulty.

Replace the CRT/chassis
assembly (Section 3.2.7) only
after trying all the other
solutions.

No video or raster,
but power indicator
is on.

2–4 Troubleshooting

Table 2–2 Blank Screen, No Video but Raster Present
Symptom

Possible Cause

Suggested Solution

No video or cursor
is visible even when
the contrast control
is at maximum;
however, raster is
visible by adjusting
the brightness
control.

Host screen saver is
activated.

Press any key to reactivate the
display.

Power to the host
system is not on.

Turn power to the host system
on.

External signal
cables are
disconnected.

Connect the signal cables
at the monitor and the host.

Signal cable is faulty.

Replace the signal cable.
Refer to the host system
documentation.

Host system is not
supplying video
signals to the
monitor.

Connect the monitor to a
known working host system
with the same refresh rate
(Chapter 5) and verify the
problem before replacing any
monitor modules.

Host system is
faulty.

Repair the host system.

Internal cabling is
loose or faulty.

Check all cabling connected
to the deflection module and
the video casting assembly. If
necessary, secure the cables.

Video casting
assembly is faulty.

Replace the video casting
assembly (Section 3.2.6).

Deflection module is
faulty.

Replace the deflection module
(Section 3.2.2).

CRT/chassis
assembly is faulty

Replace the CRT/chassis
assembly (Section 3.2.7) only
after trying all the other
solutions.

Troubleshooting 2–5

Table 2–3 Loss of Synchronization
Symptom

Possible Cause

Suggested Solution

VR320 video display
with 4-bar color
pattern is out of
sync.

Incorrect refresh rate
setting.

Check the refresh rate of the
host system and verify that the
monitor refresh rate matches
the host system.

Video cables are
faulty or improperly
connected.

If green is not present, connect
the video cables.
After connecting the video
cables and green is still not
present, swap the red and
green video cables at both the
monitor and host system.
If the display is now green
and in sync, replace the video
cable.
After connecting the video
cables and green is still not
present, swap the red and
green video cables at the
monitor. If the display is now
green and in sync, repair the
host system.
After swapping the red and
green video cables and the
display is green but out of
sync, go to the next probable
cause.

If green is present,
the problem is with
the monitor or host
system.

If another VR320 monitor is
available, swap the monitors
and see if the problem
continues.
If the problem continues,
repair the host system. If the
problem does not occur, the
problem is in the monitor.
If another VR320 monitor
is not available, replace
the deflection module
(Section 3.2.2).

2–6 Troubleshooting

Table 2–3 (Cont.) Loss of Synchronization
Symptom

Possible Cause

Suggested Solution

Deflection module is
faulty.

Replace the deflection module
(Section 3.2.2).

If the problem
continues, the video
casting assembly is
faulty.

Replace the video casting
assembly (Section 3.2.6).

If the problem still
continues, the host
system is faulty.

Repair the host system.

NOTE
Make sure the monitor has warmed up for at least 20 minutes
before you use Table 2–4. Refer to Appendix A for the color
patterns.
Table 2–4 Color Problems
Symptom

Possible Cause

Suggested Solution

Wrong color display. When
4-color bar pattern is
displays, the primary colors
are not in their proper
sequence.

Video cables are
crossed.

Swap the video cables.

Red or blue color is missing.
Missing color is restored
when red and blue cables
are swapped at both the
monitor and host system.
Color that was present is
now missing.

Signal cable is faulty.

Replace the signal
cable. Check that the
cables are installed in
the correct connectors.

Red or blue color is missing.
Missing color is restored
when red and blue cables
are swapped at the monitor.

Host system is
faulty.

Repair the host system.

Troubleshooting 2–7

Table 2–4 (Cont.) Color Problems
Symptom

Possible Cause

Suggested Solution

Green color is missing, but
video is in sync.

Swap red and green
video cables at the
monitor. If green
is still missing, the
problem is in the
monitor.

Repair the monitor.

If green is restored,
the problem is in the
host system.

Repair the host system.

Video casting
assembly is faulty.

Replace the video
casting assembly
(Section 3.2.6).

CRT/bezel/chassis
assembly is faulty.

Replace the
CRT/chassis assembly
(Section 3.2.7) only
after trying all the
other solutions.

2–8 Troubleshooting

Table 2–5 Poor Display Quality: Color, Brightness, Geometry, or Focus
Symptom

Possible Cause

Suggested Solution

Poor centering.

Centering controls
on top of the monitor
or on the deflection
module are set
incorrectly.

Adjust the centering controls
on top the monitor and check
the deflection adjustments.
Refer to Chapter 4.

Poor geometry,
and/or linearity.

Monitor is out of
adjustment.

Perform appropriate
adjustments. Refer to
Chapter 4.

Deflection module
assembly is faulty.

Replace the deflection module
assembly (Section 3.2.2)
and perform all deflection
adjustments.

Monitor needs to be
degaussed.

Press the degauss button to
correct color distortions.

Local magnetic
fields.

Remove any electromechanical
devices from the vicinity of the
monitor, or move the monitor
to another location.

CRT/chassis
assembly is faulty.

Replace the CRT/chassis
assembly (Section 3.2.7) only
after trying all the other
solutions.

Brightness or
contrast controls
set too low.

Adjust the brightness and
contrast controls.

Video casting
assembly is out of
adjustment.

Perform the color adjustments.
Refer to Chapter 4.

Host system is not
supplying correct
signal levels.

Repair the host system.

Video casting
assembly is faulty.

Replace the video casting
assembly (Section 3.2.6).

Poor color purity.
Different colors
can be seen when
an all-red pattern
displays.

Poor light output
(using the all-white
diagnostic pattern)

Troubleshooting 2–9

Table 2–5 (Cont.) Poor Display Quality: Color, Brightness, Geometry, or
Focus
Symptom

Poor color balance.

Display is not clear
or sharp.

Possible Cause

Suggested Solution

CRT wearout

Replace the CRT/chassis
assembly (Section 3.2.7) only
after trying all the other
solutions.

Video casting
assembly is out of
adjustment.

Perform all color adjustments.
Refer to Chapter 4.

Signal levels from
the host system
are not properly
balanced.

Repair the host system.

Video casting
assembly is faulty.

Replace the video casting
assembly (Section 3.2.7).

CRT/chassis
assembly is faulty.

Replace the CRT/chassis
assembly (Section 3.2.7) only
after trying all the other
solutions.

Focus is out of
adjustment.

Perform focus adjustment.
Refer to Chapter 4.

Cutoff and Gain
settings are too high.

Readjust the cutoff and gain
settings. Refer to Chapter 4.

Internal cabling is
loose or faulty.

Check all cabling connected
to the deflection module and
the video casting assembly. If
necessary, secure the cables.

Power supply module
is faulty.

Replace the power supply
module (Section 3.2.4).

Video casting
assembly is faulty.

Replace the video casting
assembly (Section 3.2.7).

Deflection module
assembly is faulty.

Replace the deflection module
assembly (Section 3.2.2)
and perform all deflection
adjustments.

2–10 Troubleshooting

Table 2–5 (Cont.) Poor Display Quality: Color, Brightness, Geometry, or
Focus
Symptom

Display characters
seem to flicker or
swim.

Possible Cause

Suggested Solution

CRT/chassis
assembly is faulty

Replace the CRT/chassis
assembly (Section 3.2.7) only
after trying all the other
solutions.

AC electromagnetic
interference from
adjacent power lines
or appliances

If possible, remove
electromagnetic devices from
the vicinity of the monitor, or
move the monitor to another
location.

Power supply module
is faulty.

Replace the power supply
module (Section 3.2.4).

Deflection module is
faulty.

Replace the deflection module
(Section 3.2.2).

NOTE
If the monitor cannot be internally degaussed and the problem is
not caused by external magnetic fields, replace the CRT/chassis
assembly (Section 3.2.7) only after trying all the other solutions.)

3
Removing and Replacing FRUs
This chapter describes how to remove and replace the VR320 monitor field
replaceable units (FRUs).

3.1 Procedures
Perform all the removal and replacement procedures from the rear of the
monitor. Tilt the monitor from the back to the front allowing easier access
to the FRUs.
NOTE
If you twist the monitor while applying the tilt pressure, the
monitor moves easily.
The procedures describe how to remove FRUs. To install each FRU,
reverse the removal procedure. Before removing any FRUs, you must
remove the rear cover and the top cover.
WARNING
Turn power to the monitor off and remove the power cord before
disconnecting or replacing any FRU.
NOTE
Any time you replace a video casting assembly, deflection module,
or power supply module, perform all the necessary adjustments.

3–1

3–2 Removing and Replacing FRUs

3.1.1 Rear Cover Removal
Remove the rear cover as follows:
1. Turn power to the monitor off (Figure 3–1).

Power
Switch/
Indicator

MA-1255-89.DG

Figure 3–1

Power Switch/Indicator

Removing and Replacing FRUs

2. Unplug the power cord from the power source first, then from the
monitor (Figure 3–2).

Power Cord

Power Source
f rom Host Syst em
MA-1020-89.DG

Figure 3–2

Removing the Power Cord

3–3

3–4 Removing and Replacing FRUs

3. Remove the three signal cables from the rear of the monitor (Sample,
Figure 3–3). Push each connector in and turn it left until the signal
cable is released from the connector.

R
G
B

RGB S i g n a l Ca b l e s

MA-1021-89.DG

Figure 3–3

Removing the Signal Cables

Removing and Replacing FRUs

3–5

4. Use a 9/32 Allen driver to loosen the four captive screws that hold the
rear cover to the CRT/chassis assembly (Figure 3–4).
NOTE
The rear cover is difficult to pull.
5. Remove the rear cover by pulling hard on the cover.

Allen Head
Screw (4)

Rear Cover

Allen Driver
MA-1022-89.DG

Figure 3–4

Removing the Rear Cover

3–6 Removing and Replacing FRUs

3.1.2 Top Cover Removal
Remove the top cover as follows:
NOTE
You may hear the fingerstock make a crackling noise when you
tilt the cover.
1. Remove the rear cover (Section 3.1.1).
2. Tilt the top cover up (Figure 3–5).
Top
Cover

MA-1023-89.DG

Figure 3–5

Tilting the Top Cover

Removing and Replacing FRUs

3. Slide the top cover toward the back of the monitor (Figure 3–6).

Top
Cover

MA-1024-89.DG

Figure 3–6

Removing the Top Cover

3–7

3–8 Removing and Replacing FRUs

3.2 Field Replaceable Units (FRUs)
The FRUs in the VR320 monitor are shown in Figure 3–7. Before
replacing any FRUs, see Section 3.1.
WARNING
Turn the power to the monitor off and remove the power cord
before disconnecting or replacing any FRU.

CRT/Chassis
Assembly

Deflection
Module

Power Supply
Module

I n t e r c o n n e c t C able
Video Cas ting
As s em bly

MA-1045-89.DG

Figure 3–7

VR320 Field Replaceable Units

Removing and Replacing FRUs

3–9

3.2.1 Interconnect Cable Removal
Remove the interconnect cable as follows:
1. Remove the rear cover (Section 3.1.1) and the top cover (Section 3.1.2).
2. Disconnect the interconnect cable (P1) from the power supply module
by pulling the connector off the module (J1).
3. Disconnect the interconnect cable (P2) from the connector (J2) on the
video casting assembly by pressing the plastic tabs outward and then
removing the cable.
4. Disconnect the interconnect cable (P3) from the connector (J3) on the
deflection module by pulling the connector off the module (Figure 3–8).

Plastic
Tab
Plastic
Tab

Interconnect
Cable
MA-1043-89.DG

Figure 3–8

Removing the Interconnect Cable

3–10 Removing and Replacing FRUs

3.2.2 Deflection Module
CAUTION
Use an anti-static protection kit (PN 29-26246-00) when handling
the deflection module.
Remove the deflection module as follows:
1. Remove the rear cover (Section 3.1.1) and the top cover (Section 3.1.2).
2. Disconnect the interconnect cable (P3) from the deflection module (J3)
(Figure 3–9).

Deflection
Module

MA-1025-89.DG

Figure 3–9

Removing the Cable from the Deflection Module

Removing and Replacing FRUs

3–11

3. Disconnect the 4-wire, 9-pin yoke cable (P11) 1 by pressing the tabs
on the connector (J11) (Figure 3–10).
4. Disconnect the 6-wire, 9-pin flat raster control cable (P6) 2 by
pressing the tab on top of the connector (J6).
5. Disconnect the 1-wire, 2-pin dynamic focus cable (P8) 3 by pressing
the tabson the connector (J8).

Deflection Module

4-Wire, 9-Pin,
CRT/Yoke
Cable

1
1
6-Wire, 9-Pin,
Raster Control
Cable

2
3

2
1-Wire, 2-Pin,
Dynamic Focus
Cable

MA-1026-89.DG

Figure 3–10

Disconnecting Cables from the Deflection Module

3–12 Removing and Replacing FRUs

NOTE
Make sure that none of the cables to the video casting
assembly interfere with the removal of the deflection module.
6. Slide the deflection module out of the card guides (Figure 3–11).

Card
Guide

Deflection
Module

Card
Guide

MA-1028-89.DG

Figure 3–11

Removing the Deflection Module

Removing and Replacing FRUs

3–13

NOTE
Before you replace the deflection module, make sure that the 66/72
Hz refresh switch 1 near the left side of the module (Figure 3–12)
is set correctly for your system. Check the setting on the module
you are replacing and move the switch if needed as follows:
Refresh Rate

Switch Position

66 Hz

Down

72 Hz

If the refresh rate is changed, check the power supply board
refresh jumper setting (Section 3.2.5).
Deflection Module
66/72 Hz
Refresh Rate
Switch

72 Hz
66 Hz

MA-1027-89.DG

Figure 3–12

Refresh Rate Switch on the Deflection Module

NOTE
Before replacing the deflection module, hold and guide the 4-wire,
9-pin cable with one hand and replace the module in the card
guides with the other hand.

3–14 Removing and Replacing FRUs

3.2.3 Discharging the CRT
You must discharge the CRT before removing the following FRUs:
•

Power supply module

•

Video casting assembly

•

CRT/chassis assembly

Discharging the CRT is a process that drains to ground any voltages
that remain in the CRT and in the extra-high tension (EHT) cable after
turning power off.
WARNING
The following steps expose you to the CRT anode, which may
store a high voltage.
Discharge the CRT as follows:
1. Remove the rear cover (Section 3.1.1).
2. Remove the top cover (Section 3.1.2).
3. Remove the CRT anode cable from the cable clamp (Figure 3–13).

Removing and Replacing FRUs

Cable
Clamp

CRT
Anode
Connector

MA-1046-89.DG

Figure 3–13

Removing the CRT Anode Cable from the Clamp

3–15

3–16 Removing and Replacing FRUs

4. Attach the clip end of the anode discharge tool (PN 29-24717-00)
to the metal on the power supply or the video casting assembly
(Figure 3–14). (Do not put the clip on the painted surface of the
monitor.)
WARNING
Keep your free hand away from any part of the monitor during
the anode discharge process.
5. Using one hand, carefully slip the anode discharge tool under the CRT
anode connector cup until it touches the connector prongs. Maintain
contact for at least 10 seconds.
CAUTION
When you use the anode discharge tool, do not tap the CRT.
Avoid scratching or marring the CRT glass when you insert or
remove the tool.
6. Using one hand, remove the CRT anode cap by pushing it in one
direction until one barb is free, then push it in the opposite direction
(Figure 3–14).

Removing and Replacing FRUs

Anode
Discharge Tool

A. Push in the direction
of the arrow.

B . W h e n o n e b a r b i s f r e e,
push in the opposite
direction (see arrows)
to remove anode cap.

MA-1035-89.DG

Figure 3–14

Discharging and Removing the CRT Anode

3–17

3–18 Removing and Replacing FRUs

3.2.4 Power Supply Module Removal
Remove the power supply module as follows:
WARNING
You must discharge the CRT (Section 3.2.3) before removing the
power supply module.
1. Remove the rear cover (Section 3.1.1) and the top cover (Section 3.1.2).
2. Disconnect the interconnect cable (P1) at the power supply (J1)
(Figure 3–15).

Power
Supply
Module

Interconnect
Cable

MA-1037-89.DG

Figure 3–15

Removing the Interconnect Cable from the Power Supply

Removing and Replacing FRUs

3–19

3. Disconnect the 1-wire, 2-pin dynamic focus cable (P8) from the
deflection module by pressing the tabs on the connector (J8)
(Figure 3–16).
4. Remove the 1-wire, 2-pin dynamic focus cable from the cable clamp on
the inside wall of the video area.
5. Move the 1-wire, 2-pin dynamic focus cable over the yoke to the power
supply side.

1-Wire, 2-Pin,
Dynamic Focus
Cable
Cable Clamp
1-Wire, 2-Pin,
Dynamic Focus
Cable

Deflection
Module

MA-1049-89.DG

Figure 3–16

Removing the Dynamic Focus Cable

3–20 Removing and Replacing FRUs

6. Disconnect the 4-wire, 4-pin degauss cable (P10) 1 from the
power supply module by pressing the tabs on the connector (J10)
(Figure 3–17).
Power Supply Module

1
To Video
Casting
To
Deflection
Module

4-Wire, 4-Pin,
Degauss
Cable

MA-1036-89.DG

Figure 3–17

Removing the Degauss Cable from the Power Supply

Removing and Replacing FRUs

3–21

7. Loosen the two screws on the power supply module (Figure 3–18).

Power
Supply
Module

Phillips Head
Screws (2)
MA-1041-89.DG

Figure 3–18

Loosening the Power Supply Screws

3–22 Removing and Replacing FRUs

8. Slide the power supply partially out to expose the 3-wire, 5-pin LED
cable (Figure 3–19).
3-Wire, 5-Pin,
LED Cable
Card
Guide
Power
Supply
Module

MA-1052-89.DG

Figure 3–19

Sliding the Power Supply Out (Partially)

Removing and Replacing FRUs

3–23

9. Disconnect the 3-wire, 5-pin LED cable 1 from the power supply
module by pressing the tab on top of the connector (Figure 3–20).
Power Supply Module

1
To Video
Casting

3-Wire, 5-Pin,
LED C able

MA-1038-89.DG

Figure 3–20

Removing the LED Cable from the Power Supply

3–24 Removing and Replacing FRUs

10. Remove the 1-wire, 3-pin focus pack cable and the two focus cables
from the cable clamp on the upper right side of the video casting
assembly (Figure 3–21).
11. Disconnect the 1-wire, 3-pin focus pack (P7) cable from the top of the
video casting by pressing the tabs on the connector (J7).
Black and
White Focus
Cables
Focus Pack
Cable and
Focus Cables

Video
Casting
Assembly

1-Wire, 3-Pin,
Focus Pack
Cable

Power Supply
Module

MA-1044-89.DG

Figure 3–21

Disconnecting the Focus Pack and Focus Cables

Removing and Replacing FRUs

3–25

12. Carefully slide the power supply module (with the two focus cables
still attached) out of the card guide (Figure 3–22).
13. Place the power supply on a flat surface close to the monitor.

Black and
White Focus
Cables

Power
Supply
Module

MA-1031-89.DG

Figure 3–22

Removing the Power Supply

3–26 Removing and Replacing FRUs

14. Disconnect the white wire for focus 1 and the black wire for focus 2
from the focus pack (Figure 3–23).
NOTE
Carefully guide the power supply cabling when removing and
replacing the power supply.
Power Supply Module

To Vi deo
Cas ti ng
1

White Focus 1
Wire

Black
Focus 2 Wire
MA-1039-89.DG

Figure 3–23

Removing the Focus Wires

Removing and Replacing FRUs

3–27

3.2.5 Power Supply Module Replacement
NOTE
Before replacing the power supply, verify that the 66/72 Hz refresh
rate jumper (Figure 3–24) is set correctly for your system.
Refresh Rate

Move Jumper to Cover

66 Hz

Bottom pins (Top pin is free.)

72 Hz

Top pins (Bottom pin is free.)

If the refresh rate is changed, check the setting of the deflection
module refresh switch, (Figure 3–12.))
Power Supply Module

66
Hz

To Video
Casting

72
Hz

66/ 72 Hz J umper

MA-1040-89.DG

Figure 3–24

Refresh Rate Jumper on the Power Supply

3–28 Removing and Replacing FRUs

Replace the power supply module as follows:
1. Pull back the rubber boot on the white wire for focus 1 to expose the
connector (Figure 3–25).
2. Connect the white wire for focus 1 until you see it snap into place.
3. Push forward the focus 1 boot sleeve.
4. Pull back the rubber boot on the black wire for focus 2 to expose the
connector.
5. Connect the black wire for focus 2 until you see it snap into place.
6. Push forward the focus 2 boot sleeve.
Power Supply Module

T o V i deo
Cas t i ng
1

Wh i te F o c u s 1
Wi r e

Black
F o c u s 2 Wi r e
MA-1047-89.DG

Figure 3–25

Attaching the Focus Wires to the Power Supply

Removing and Replacing FRUs

3–29

7. Connect the 3-pin, 1-wire cable (P7) to J7 of the video casting
assembly.
8. Place the anode cable and dynamic focus cable in front of the power
supply before inserting the power supply in the card guides.
9. Slide the power supply in the card guides approximately 1/4 of the
way.
10. Place the focus 1 and focus 2 wires and the dynamic focus cable in the
cable clamp to the right of the video casting assembly.
11. Put the dynamic focus cable into the clamp on the rear wall of the
monitor behind the video casting assembly.
12. Connect the 5-pin, 3-wire LED cable.
NOTE
Handle the anode cable carefully and guide it when sliding the
power supply in the card guides.
13. Carefully slide the power supply in the card guides.
14. Connect the 4-pin, 4-wire power switch cable (P4) to J4.
15. Attach the 2-pin, 1-wire dynamic focus wire to the deflection module.
16. Connect the interconnect cable to the power supply (see Figure 3–15).
17. Connect the anode cable (P11) to the CRT and place the anode cable
into the cable clamp that is on the tube.
18. Tighten the screws on the power supply.

3–30 Removing and Replacing FRUs

3.2.6 Video Casting Assembly
Remove the video casting assembly as follows:
1. Remove the rear cover (Section 3.1.1).
2. Remove the top cover (Section 3.1.2).
3. Discharge the CRT anode (Section 3.2.3).
4. Remove the power supply (Section 3.2.4).
5. Disconnect the interconnect cable (P2) at the video casting assembly
(J2) by pressing the plastic tabs outward and then removing the cable
(Figure 3–26).
6. Disconnect the 8-wire, 8-pin brightness/contrast/degauss cable (P5) by
pressing the tab on top of the connector (J5).
7. Remove the 8-wire, 8-pin brightness/contrast/degauss cable from the
cable clamp on the bottom of the video casting assembly.

Removing and Replacing FRUs

Plastic
Tab
Plastic
Tab

Cable
Clamp

Video
Casting
Assembly
8-Wire,
8-Pin,
Brightness/
Contrast
Cable

Interconnect
Cable

MA-1042-89.DG

Figure 3–26

Removing Cables from the Video Casting

3–31

3–32 Removing and Replacing FRUs

8. Pry the button plug off the video casting assembly with a flat-blade
screwdriver (Figure 3–27).
Video
Casting

Button
Plug

MA-1032-89.DG

Figure 3–27

Removing the Plug from the Video Casting

Removing and Replacing FRUs

3–33

9. Reach in and pull the CRT socket connector straight toward you and
off the pins (Figure 3–28).
CAUTION
Use care not to bend the pins when you disconnect the CRT
socket from the neck of the CRT.

CRT
Socket
C o n n e c to r

MA-1033-89.DG

Figure 3–28

Removing the CRT Socket Connector

3–34 Removing and Replacing FRUs

10. Loosen the two spring-loaded captive screws until they spring
out towards you (Figure 3–29). The screws hold the video casting
assembly to the chassis.
11. Gently pull the top of the video casting assembly toward you.
12. Gently lift the video enclosure assembly up and out of the chassis.
Spring-loaded
Captive Screw (2)

Video Casting
A s s e mb l y
MA-1034-89.DG

Figure 3–29

Removing the Video Casting

CAUTION
When you install the video casting assembly, carefully, but firmly,
push the CRT socket connector onto the CRT neck until it stops.
Use care not to bend the pins during this procedure.
When replacing FRUs, install the video casting assembly before
installing the power supply.

Removing and Replacing FRUs

3–35

3.2.7 CRT/Chassis Assembly
Remove the CRT/chassis assembly as follows:
1. Remove the rear cover (Section 3.1.1).
2. Remove the top cover (Section 3.1.2).
3. Remove the deflection module (Section 3.2.2)
WARNING
You must discharge the CRT (Section 3.2.3) before removing
the following FRUs.
4. Remove the power supply module (Section 3.2.4).
5. Remove the video casting assembly (Section 3.2.6).

3.3 CRT Disposal (Trained Service Personnel Only)
This section describes how to safely dispose of the monitor CRT. CRTs are
glass vacuum tubes. Because air pressure outside the tube is greater than
air pressure inside, there is always the possibility of accidental implosion.
WARNING
You must handle CRTs very carefully to avoid accidental
implosion and shattering glass. Use the following guidelines
and disposal procedure to remove and dispose of a CRT. These
guidelines and procedure are Digital policy for all CRTs more
than 7.6 cm (3 in) in diameter.
NOTE
This procedure supersedes all other tech tips about replacing
and disposing of CRTs. This procedure is for Digital personnel
only and is not intended for use by OEM and self-maintenance
customers.
Location
Work in areas where risks and exposure are limited to trained Digital
personnel. Only Digital personnel should be in the area during CRT
removal and replacement.

3–36 Removing and Replacing FRUs

Handling a CRT
•

Never handle the CRT by the neck. Always use two hands and hold
the CRT by the sides near the face.

•

Keep the CRT away from your body during handling.

•

Do not let the neck strike anything.

•

Do not rest the CRT on its neck.

•

Do not let the CRT touch any tools, such as screwdrivers and soldering
irons.

Stocking and Storage
All CRTs must be kept in a closed container or mounted in the device
cabinetry.
CRT Disposal
Use the following procedure to safely dispose of CRTs. Always perform
this procedure at a Digital facility.
WARNING
Do not dispose of any CRT until it is rendered inoperative and
safe to dispose.
Never perform the following disposal procedure at the customer
site. Return the defective CRT to the local Digital facility for
disposal.
At the Digital facility you must:
•

Clear the area of nonessential personnel.

•

Have a second person in the area in case of emergency.

•

Wear safety goggles (PN 29-16141-00).

•

Wear gloves (PN 29-16146-00).

•

Use pliers.

WARNING
To avoid injury to your eyes or hands, always wear goggles
and gloves when you work with a CRT. Never handle pieces of
phosphor-coated glass without wearing protective gloves.

Removing and Replacing FRUs

3–37

Before you perform the following procedure, remove the FRUs listed in
Section 3.2.7.
1. Place the old CRT/chassis assembly and the packing material in the
container from which you removed the new CRT/chassis assembly.
2. Using pliers, slowly crush, but do not snap, the evacuation point
(Figure 3–30). Do not move or disturb the CRT until the hissing
sound of in-rushing air has stopped.
CAUTION
Use care not to break the unprotected glass area of the CRT
neck that surrounds the evacuation point.
NOTE
The evacuation point is a protrusion that extends from
the circular area defined by the CRT neck pins. The glass
protrusion is sometimes encased in a protective plastic cap,
and more force is required to crush it.
3. Seal the carton with packing tape and dispose of it in the Digital site
trash receptacle.
NOTE
The safe "gassing" of the CRT is necessary to prevent liability and
safety problems that may arise from accidental CRT implosion.

3–38 Removing and Replacing FRUs

MA-X0667-88

Figure 3–30

Crushing the Evacuation Point

4
Aligning the Video Monitor
4.1 Introduction
This chapter describes how to align the monitor. You do not have to
perform every adjustment procedure each time you align the monitor;
however, you should check all adjustments in the order shown because
many adjustments affect each other. If a setting is already correct, you
can skip that adjustment and go on to the next one.
See Section 4.1.1 to prepare the monitor for adjustments. You must use
the screen alignment test patterns to make all adjustments. Refer to your
host system documentation to set up test patterns.
Use a metric measuring tape (PN 29-25342) to measure the dimensions of
the screen display. To avoid scratching the screen with the tape’s metal
clip, start the measurement at 10 cm. Use a video alignment tool to make
all adjustments except when noted. Make sure all adjustments are made
under these conditions.

4.1.1 Before You Start
NOTE
If a customer calls with a display quality type of problem, ask
the customer to leave the monitor on until you arrive. Then,
after removing the rear enclosure, only a five minute warm-up is
needed.
NOTE
Before you start any adjustment procedures, be sure the power
supply module and the deflection module are configured for the
correct refresh rate setting (66 Hz or 72 Hz) for your system. See
Chapter 3 for the locations of the refresh rate jumper and switch.

4–1

4–2 Aligning the Video Monitor

Clean the Monitor
To clean the monitor, use a soft tissue or cloth and a non-abrasive,
non-flamable glass cleaner, or use Digital’s video screen cleaner, PN
VT3XX-SC.
Prepare the Monitor
Before you perform adjustments, prepare the monitor as follows:
1. Place the monitor on a nonconductive surface.
2. Remove the rear cover (Section 3.1.1)
3. Remove the top cover (Section 3.1.2).
4. Connect the video cables.
5. Connect the power cord.
6. Turn power to the monitor on. Wait for a video display on the screen.
7. Verify that the user controls on the top of the monitor are at the
center position of the thumbwheels.
8. Slide the deflection module out 1/2 inch to read the labels for the
adjustment potentiometers.
9. Rotate the monitor so the adjustments are on the right and the screen
to view the test pattern is on the left.

4.1.2 Displaying Screen Tests
The procedures in this chapter refer to the circle-crosshatch pattern and
the central rectangle patterns which are described in Appendix A. Display
them on the screen as needed by using the procedures for the host system.
Refer to the host system service guide for accessing the diagnostic screen
patterns.

Aligning the Video Monitor 4–3

4.2 Monitor Adjustments
Let the monitor warm up for at least 20 minutes before performing any
adjustments. The warm-up time ensures that the electron guns are at a
stable temperature before you do any adjustments. The user adjustments
are shown in Figure 4–1.

Ho ri z o n t a l Ve rt i c a l
Ce n t e ri n g Ce n t e ri n g

Power Switch/
Indicator

Contrast

Bri g h t n e s s

De G a u s s

MA-1055-89.DG

Figure 4–1

User Adjustments

4–4 Aligning the Video Monitor

4.3 Using the Radiance Meter
Use the radiance meter as follows:
1. Remove the protective cap from the radiance meter sensor head and
connect the occluder to the radiance meter (Figure 4–2).
CAUTION
Avoid excessive force when tightening the occluder or you may
damage the radiance meter. Do not touch the exposed filter
after the protective cap is removed.

Occuluder

AC Adapter

AC Adapter
Connector

Sensor
Head
Power
Switch
Range
Switch
MA-0647-90.DG

Figure 4–2

Radiance Meter

Aligning the Video Monitor 4–5

2. Connect the ac line adapter to the radiance meter and plug it into a
wall outlet. Ensure that the radiance meter is in calibration.
3. Turn on the power switch.
NOTE
Do not use the POWER ON W/BACKLIGHT position when you
are using the radiance meter with batteries.
4. Set the range switch to the second position from the top (1.999).
5. Place the occluder firmly against the center of the screen (Figure 4–3).
Use a red china pencil and draw a circle around the occluder.
NOTE
You must take all meter readings with the meter centered in
this arc or circle.

MA-1350-89.DG

Figure 4–3

Using the Radiance Meter

4–6 Aligning the Video Monitor

4.4 Color Adjustments
Figure 4–4 shows the location of the controls used to make the color
adjustments.
Red
Gain

Red
Cutoff

Green
Gain

Blue
Cutoff

Blue
Gain

Dyn
Phase
(Hidden)
Service
Switch

Focus 1
Focus 2
S creen (G2)

P ower S upply
V ideo Casting
A ssem bly
MA-1054-89.DG

Figure 4–4

Color Adjustment Controls

Aligning the Video Monitor 4–7

1. Set the G2, or SCREEN, to minimum (counterclockwise)
(Figure 4–5).

MA-1051-89.DG

Figure 4–5

G2 Adjustment

2. Set the following controls on the video enclosure assembly to
minimum (counterclockwise):
•

Red cutoff (R.CUTOFF or RC)

•

Blue cutoff (B.CUTOFF or BC)

•

Red gain (R.GAIN or RG)

•

Green gain (G.GAIN or GG)

•

Blue gain (B.GAIN or BG)

4–8 Aligning the Video Monitor

3. Use the blank raster pattern for the following steps.
4. Set the brightness and contrast controls (Figure 4–6) to maximum
(clockwise).

Contrast

Brightness

MA-0245-90.DG

Figure 4–6

Brightness and Contrast Controls

Aligning the Video Monitor 4–9

5. Slowly turn the G2, or SCREEN, (Figure 4–5) clockwise until the
radiance meter shows a value of .002 to .004; the raster is not visible.
6. Set brightness to minimum (counter-clockwise).
7. The screen should be totally blank; if not, repeat steps 1 through 6.
8. Set the service switch (Figure 4–7) on the deflection module to
SERVICE (down position).
Bl ue Cutoff
Ser vice Switch ( Down)

Red Cutoff

MA-1351-89.DG

Figure 4–7

Service Switch and Blue and Red Cutoff

4–10 Aligning the Video Monitor

NOTE
Cutoff is the point of operation in a CRT where current does
not flow. Adjust and ensure that the cutoff controls are set
equally.
9. To adjust the green cutoff, turn the brightness control until a
horizontal green line is visible in the middle of the screen. Turn
the brightness control just until the green line disappears. Do not turn
the control too far.
10. To adjust the red cutoff, turn the red cutoff (R.CUTOFF) on the video
enclosure assembly until a horizontal red line is visible in the middle
of the screen. Turn the cutoff just until the red line disappears. Do
not turn the control too far.
11. To adjust the blue cutoff, turn the blue cutoff (B.CUTOFF) on the
video enclosure assembly until a horizontal blue line is visible in
the middle of the screen. Turn the cutoff just until the blue line
disappears. Do not turn the control too far.
12. Set the service switch (Figure 4–8) to its normal position (up position).
Turn the brightness and contrast to normal viewing settings.

Aligning the Video Monitor 4–11

Service Sw itch (U p)

MA-1352-89.DG

Figure 4–8

Setting Service Switch to Normal Position

4–12 Aligning the Video Monitor

13. Use the red, green, and blue central rectangle patterns for the gain
adjustments.
14. To adjust gain, use the radiance meter (Section 4.3). Adjust the gain
controls (Figure 4–9) for the following values:
Red screen

R.GAIN

.095

Green screen

G.GAIN

.120

Blue screen

B.GAIN

.110

To verify that the color adjustments are correct, display the 4-bar or 8-bar
color pattern (Appendix A) from the host. Turn the contrast down slowly.
All colors should fade equally. If one or more colors seem to dominate,
repeat steps 1-13 with attention to the sensitive adjustments in steps 5, 9,
10, and 11.
Red Gain
Green Gain
Blue Gain

MA-1353-89.DG

Figure 4–9

Blue, Green, and Red Gain Controls

Aligning the Video Monitor 4–13

4.5 Deflection Adjustments
Figure 4–10 shows the location of the controls used to make the deflection
adjustments. Pull the deflection module out slightly to see the labels on
the controls.
H C en
H Lin

P in
Trap
W idth
V C en
V P arab
H P hase
H P arab
V H old
V Lin
H eight
H H old
D eflectio n
Module
MA-1053-89.DG

Figure 4–10

Location of Deflection Adjustments

4–14 Aligning the Video Monitor

This section covers the following adjustments:
•

Vertical linearity (VLIN)

•

Vertical centering (VCEN)

•

Vertical height (HEIGHT)

•

Horizontal linearity (HLIN)

•

Horizontal phase (HPHASE)

•

Horizontal centering (HCEN)

•

Horizontal width (WIDTH)

•

Side pincushioning (PIN)

•

Trapezoid (TRAP)

•

Dynamic focus (FOCUS1, FOCUS2, DYN PHASE, HPARAB, and
VPARAB)

For these adjustments, select the circle-crosshatch pattern or the all-white
pattern from your host system. Before starting the deflection adjustments,
place the horizontal centering and the vertical centering user controls at
the mid-point position.

Aligning the Video Monitor 4–15

NOTE
In the following steps, use a metric measuring tape (PN 2925342) to measure the dimensions of the screen display. To
avoid scratching the screen with the tape’s metal clip, start the
measurement at 10 cm on the measuring tape. See Figure 4–11.

273 mm

342 mm

MA-1256-89.DG

Figure 4–11

Using the Metric Measuring Tape

4–16 Aligning the Video Monitor

4.5.1 Vertical Linearity (VLIN)
Check and adjust vertical linearity as follows:
1. Verify that the horizontal and vertical centering user controls on the
top of the monitor are in the center position of the thumbwheels.
2. Display the circle-crosshatch pattern (Figure 4–12).
3. Check to see if 3 or 4 rows at the top of the screen are of equal height
with 3 or 4 rows at the bottom of the screen. If not, go to the next
step.
4. Turn the VLIN adjustment (Figure 4–13) until the squares seem to be
of equal height on the screen.

MA-X0889-88

Figure 4–12

Circle-Crosshatch Pattern

Aligning the Video Monitor 4–17

VCen

VHold
VLin

MA-0246-90.DG

Figure 4–13

VCEN, VHOLD, and VLIN Controls

4.5.2 Vertical Centering (VCEN)
Check and adjust the vertical centering as follows:
1. Verify that the vertical centering user control is at the mid-point
position.
2. Display the circle-crosshatch screen.
3. If the screen display appears equally centered between the top and
bottom bezel, it is normal. If the display does not appear equally
centered, go to the next step.
4. Turn the VCEN control (Figure 4–13) until the display appears
equally centered between the top and bottom bezel.

4–18 Aligning the Video Monitor

4.5.3 Height (HEIGHT)
Check and adjust the vertical height as follows:
1. Check the circle-crosshatch pattern for a vertical height of 273 mm
.
2. If necessary, adjust the HEIGHT control (Figure 4–14) until the
display height is 273 mm (± 2.0 mm).

Height

MA-1356-89.DG

Figure 4–14

Vertical Height Control

Aligning the Video Monitor 4–19

4.5.4 Horizontal Phase, Horizontal Linearity, and Horizontal
Centering (HPHASE, HLIN, HCEN)
Check and adjust the video display horizontal centering as follows:
NOTE
Refer to the troubleshooting chart in Chapter 2 for solutions to
screen display problems.
1. Verify that the user controls at the top of the monitor are at the center
position of the thumbwheels.
2. Display the circle-crosshatch pattern.
3. Turn the brightness control until the raster is visible. You may have
to decrease the contrast control to see the raster.
4. Check the circle-crosshatch pattern to see if it appears centered on
the raster.
5. If necessary, adjust the HPHASE control (Figure 4–15) to center the
pattern on the raster.
6. Decrease the brightness just until the raster disappears.
7. Adjust HLIN for maximum width of the circle-crosshatch pattern.
8. Readjust HLIN slightly until all the squares are of equal width across
the screen.
9. Set contrast to minimum and brightness to maximum.
10. Adjust HCEN (Figure 4–15) until the raster (or active area) is
centered within the bezel. (The orientation of HCEN may differ
on some units from that shown in Figure 4–15.)
11. If the HCEN adjustment is not sufficient to center the active area,
then adjust the HPHASE so that the active area is centered within
the bezel.

4–20 Aligning the Video Monitor

H L in

HCen

HPhase

MA-1357-89.DG

Figure 4–15

HPHASE, HLIN, and HCEN Controls

Aligning the Video Monitor 4–21

4.5.5 Horizontal Width (WIDTH)
Check and adjust the horizontal width as follows:
NOTE
In the following steps, use a metric measuring tape (PN 2925342) to measure the dimensions of the screen display. To
avoid scratching the screen with the tape’s metal clip, start the
measurement at 10 cm on the measuring tape (Figure 4–16).

273 mm

342 mm

MA-1256-89.DG

Figure 4–16

Measuring the Width of the Viewing Area

4–22 Aligning the Video Monitor

1. Check the circle-crosshatch pattern for a width of 342 mm (± 2.0 mm).
2. If necessary, adjust the WIDTH control (Figure 4–17) until the display
width is 342 mm (± 2.0 mm).

Width

MA-1358-89.DG

Figure 4–17

Horizontal Width Control

Aligning the Video Monitor 4–23

4.5.20 Side Pincushioning (PIN)
When the sides of a video display bow, the effect is known as
pincushioning or barreling, depending on whether the sides bow in or
out. See Figure 4–18 and Figure 4–19.

MA-X0925-88

Figure 4–18

Video Area on Screen Bowed Out

MA-X0673-88

Figure 4–19

Video Area on Screen Bowed In

4–24 Aligning the Video Monitor

Check and adjust side pincushioning as follows:
1. Display the circle-crosshatch pattern.
2. Adjust the PIN control (Figure 4–20) until the sides of the display are
straight.
NOTE
Adjusting the PIN control may affect the width adjustment.
Recheck the display for correct width (Section 4.5.5).
Pin

MA-1029-89.DG

Figure 4–20

Pincushion Adjustment (PIN)

Aligning the Video Monitor 4–25

4.5.7 Trapezoid (TRAP)
Check and adjust the screen display as follows:
1. Display the circle-crosshatch screen.
2. Be sure the screen does not form a trapezoid (Figure 4–21) or
(Figure 4–22).

MA-X0927-88

Figure 4–21

Screen Wider at Top

MA-X0929-88

Figure 4–22

Screen Wider at Bottom

4–26 Aligning the Video Monitor

3. Adjust the TRAP control (Figure 4–23) so that the top and bottom of
the screen display (on the same side) are the same distance from the
bezel edge.

Trap

MA-1048-89.DG

Figure 4–23

Trapezoid Adjustment (TRAP)

Aligning the Video Monitor 4–27

4.5.8 Focus (FOCUS1, FOCUS2, DYN PHASE, HPARAB,
VPARAB)
Figure 4–24 shows the locations of the focus adjustment controls on the
power supply and the deflection module.

VParab
Dyn
Phase

HParab

Focus 1
Focus 2

MA-1050-89.DG

Figure 4–24

Focus Adjustment Controls

4–28 Aligning the Video Monitor

Preparation
NOTE
Make sure the screen is clean. A dirty screen can distort a
focused display. Use a soft tissue or cloth and a non-abrasive,
non-flamable glass cleaner, or use Digital’s video screen cleaner
(PN VT3XX-SC).
1. Perform the color adjustments (Section 4.4).
2. Display the circle-crosshatch screen (Figure 4–25).

MA-X0891-88

Figure 4–25

Circle-Crosshatch Screen

Aligning the Video Monitor 4–29

Dynamic Focus
Check and adjust the focus as follows:
1. Choose an intersection on the crosshatch pattern that is halfway
between the center and the top right corner of the screen display
(Figure 4–25).
2. Examine the intersecting lines for sharpness.
3. If necessary, alternating between the controls, adjust the FOCUS2
control (Figure 4–24) for the sharpest vertical line and adjust the
FOCUS1 control for the sharpest horizontal line.
4. Examine the screen for sharpness of the entire display. If the display
is satisfactory, the focus adjustment is complete.
NOTE
If the display is not satisfactory (screen center and corners are
not sharp), proceed to the next steps.
5. Adjust the vertical dynamic focus (VPARAB) (Figure 4–24) until the
top middle and bottom middle are sharp.
6. Adjust the horizontal dynamic focus (HPARAB) until the corners are
sharp.
7. Repeat this procedure from step 1. If necessary, continue with the
dynamic phase adjustment.
Dynamic Phase
1. Examine the screen for sharpness.
2. If the right or left edge is not in focus, while the opposite edge is in
focus, adjust dynamic phase (DYN PHASE) until both edges are in
focus.
3. Repeat this procedure from the Dynamic Focus adjustment.

5
Changing Refresh Rates
This chapter describes how to change the monitor refresh rate.

5.1 Refresh Rates of VR320 Monitors
Table 5–1 lists the different VR320 models and their refresh rates.
Table 5–1 Refresh Rates of Monitor Models
Model

Pixels x Lines

Refresh Rate

Applicable Area

VR320-CA

1280 x 1024

66 Hz

Northern Hemisphere

VR320-C4

1280 x 1024

66 Hz

Southern Hemisphere

VR320-DA

1280 x 1024

72 Hz

Northern Hemisphere

VR320-D4

1280 x 1024

72 Hz

Southern Hemisphere

5.2 Changing the Refresh Rate
If you change the monitor refresh rate to meet the needs of a different
system from the one ordered, use the following procedure:
1. Change the refresh switch on the deflection module (Figure 3–12).
2. Change the refresh jumper on the power supply module (Figure 3–24).
3. If necessary, adjust the VHOLD, VLIN and VCEN controls until the
display height is 273 mm (Figure 4–13).
4. If necessary, adjust the HEIGHT (Section 4.5.3), HPHASE, HLIN, and
HCEN controls (Section 4.5.4).
5. If necessary, adjust the WIDTH (Section 4.5.5), PIN (Figure 4–20),
and TRAP (Section 4.5.7) controls.
6. If necessary, adjust the focus (Section 4.5.8).

5–1

5–2 Changing Refresh Rates

5.3 Product Variation Label
After you changing the refresh rate and test the system, add the following
information to the product variation label:
Table 5–2 Product Variation Label Information
Label Entry

Information

From

The model designation from the original serial tag.

The new model designation of the completed product.

The character site code for the facility where the conversion
was done, as listed in the Digital telephone directory.

Date

The date when the conversion was implemented.

Attach the product variation label to the back of the monitor a shown in
Figure 5–1.

Changing Refresh Rates 5–3

36-15946-01-c1

Product Conversion
From:
To:
Date:

708A
Listed
E.D.P. Equip.

36-15946-01-c1

By:

Model: VR320
SN:

Prod
From uct Con
:
vers
To:
ion
By:
Date
:

To Host System

MA-0153-90.DG

Figure 5–1

Product Variation Label

A
Alignment Screens
This appendix describes the screen patterns used to diagnose color and
deflection problems, as well as to perform deflection, color checks and
adjustments.

A.1 Circle-Crosshatch Pattern
Use the circle-crosshatch pattern (Figure A–1) for all alignment tests.
Use this pattern as a reference for customers who work primarily with
graphic applications.

MA-X0889-88

Figure A–1

Circle-Crosshatch Pattern

A–1

A–2 Alignment Screens

A.2 All-White Pattern
Use the all-white pattern (Figure A–2) to check for the correct setting of
the horizontal and vertical controls.

MA-1254-89.DG

Figure A–2

All-White Pattern

Alignment Screens A–3

A.3 Central Rectangle Pattern
Use the red, green, and blue central rectangle pattern (Figure A–3) when
performing the gain adjustments.

MA-X0928-88

Figure A–3

Central Rectangle Pattern

A–4 Alignment Screens

A.4 All Es Pattern
Use the screen of Es (Figure A–4) as a secondary reference for customers
who work primarily with text.
EEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEE
EEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEE
EEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEE
EEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEE
EEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEE
EEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEE
EEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEE
EEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEE
EEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEE
EEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEE
EEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEE
EEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEE
EEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEE
EEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEE
EEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEE
EEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEE
EEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEE
EEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEE
EEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEE
EEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEE
EEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEE
EEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEE
EEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEE
EEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEE
EEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEE
EEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEE

MA-X0938-88

Figure A–4

All Es Pattern

Alignment Screens A–5

A.5 Color Bars I Pattern
Use this 4-bar color pattern (Figure A–5) to check for the presence of all
colors, and to check if the colors are in the correct order.

BLUE

RED

GREEN

WHITE

MA-X0935-88

Figure A–5

Color Bars I Pattern

A.6 Color Bars II Pattern
Use this 8-bar color pattern (Figure A–6) to check for the presence of all
colors, and to check if the colors are in the correct order.

BLACK

BLUE

RED

MAGENTA

GREEN

CYAN

YELLOW

WHITE

MA-X0936-88

Figure A–6

Color Bars II Pattern

B
VR320 Documentation
The following additional VR320 documents can be ordered from Digital.
Some of the documents are available in several languages. Please contact
your sales representative for availability and more information.
Installing and Using the VR320 Color Monitor
EK-VR320-IN
This guide provides users with the information needed to install, operate
and maintain the VR320 monitor. The manual also describes all controls
and indicators.
VR320 Color Monitor IPB
EK-VR320-IP
This document provides a detailed parts breakdown of the VR320 field
replaceable units. The document does not contain part numbers for
components on the printed circuit modules. However, these components
are listed in the Field Maintenance Print Set.
VR320 Field Maintenance Print Set
MP-03005-01
This document provides a field maintenance set of electrical and
mechanical schematic diagrams for the VR320 color monitor.

B–1

Index
A
Adjustments
blue
cutoff (B. CUTOFF), 4–7
gain (B. GAIN), 4–7
color, 4–6, 4–7, 4–10
cutoff, 4–6, 4–7, 4–10
deflection, 4–13
dynamic focus, 4–29
dynamic phase, 4–29
dynamic phase (DYN PHASE),
4–27
FOCUS1, 4–27
FOCUS2, 4–27
G2 (SCREEN), 4–9
gain, 4–6, 4–7, 4–12
green
gain (G. GAIN), 4–7
HCEN, 4–19, 4–20
HEIGHT, 4–18
HLIN, 4–19, 4–20
HPARAB, 4–27
HPHASE, 4–19, 4–20
pincushion (PIN), 4–24
red
cutoff (R. CUTOFF), 4–7
gain (R. GAIN), 4–7
RGB, 4–6, 4–7, 4–10
screen width, 4–21
trapezoid (TRAP), 4–25
VCEN, 4–17
VLIN, 4–16
VPARAB, 4–27
WIDTH, 4–21

Alignment
procedure, 4–1
screens
all Es, A–4
all-white pattern, A–2
central rectangle pattern,
A–3
circle-crosshatch pattern,
A–1
color bars patterns, A–5
red, green, and blue, A–3
All-white pattern, A–2
Anode discharge tool, 1–2
Audience, v

B
Blank screen
without video but raster
see Table 2–2.
without video or raster
see Table 2–1.
Blue
cutoff adjustment (B. CUTOFF),
4–6, 4–7, 4–10
gain adjustment (B. GAIN), 4–6,
4–7, 4–12
Blue color missing, 2–6
Brightness/contrast
cable, 3–30

Index 1

2 Index

Central rectangle pattern, A–3
Circle-crosshatch pattern, 4–28, A–1
Cleaning the monitor, 4–2, 4–28
Color
adjustments, 4–6, 4–7, 4–10
problems
see Table 2–4.
Color bars
II pattern, A–5
I pattern, A–5
Conventions, v
CRT
discharge, 3–14
disposal, 3–35, 3–36, 3–38
handling, 3–36
socket removal, 3–33
storage, 3–36
CRT/chassis assembly
Northern Hemisphere, 1–3
part number, 1–3
removal, 3–35
Southern Hemisphere, 1–3

Es pattern, A–4

D
Deflection module
adjustments, 4–13
part number, 1–3
removal, 3–10, 3–12
Degauss cable
removal, 3–20
Discharging CRT, 3–14, 3–17
Disposing of CRT, 3–35
Documentation
IPB, B–1
print set, B–1
Dynamic
focus, 4–29
phase, 4–29
phase adjustment, 4–27, 4–29

F
Field maintenance print set, B–1
Field replaceable units (FRUs), 3–8
Flicker, 2–10
Focus
dynamic, 4–29
Focus pack cable
removal, 3–24, 3–26

G
Gloves
handling CRT, 3–36
part number, 1–2
Green
cutoff adjustment, 4–10
gain adjustment (G. GAIN), 4–6,
4–7, 4–12
Green color missing, 2–6

H
HCEN adjustment, 4–19, 4–20
HEIGHT adjustment, 4–18
Height adjustments
HEIGHT, 4–18
VCEN, 4–17
VLIN, 4–16
HLIN adjustment, 4–19, 4–20
HPARAB, 4–29
HPARAB adjustment, 4–27
HPHASE adjustment, 4–19, 4–20

Index 3

Interconnect cable
part number, 1–3
removal, 3–9

Phase adjustment, 4–29
Pincushion, 4–24
Pincushioning, 4–23
Pixels, 1–2, 5–1
Poor display quality
see Table 2–5.
Power supply
part number, 1–3
refresh rate jumpers, 3–27
removal, 3–18, 3–25
Print set, B–1
Product description, 1–1
Product label, 5–2
Protective gear
gloves, 3–36
safety goggles, 3–36

J
Jumpers, refresh rate
deflection module, 3–13
power supply, 3–27

L
LED cable
removal, 3–23

M
Magnetic fields
affect on monitor, 2–1
Metric measuring tape, 1–2
Model variations
northern hemisphere, 1–2
southern hemisphere, 1–2

N
Northern Hemisphere
CRT/chassis assembly, 1–3
models, 1–2, 5–1
refresh rate, 5–1

O
Occluder, 4–4

R
Radiance meter
using, 4–4
Recommended spare parts, 1–3
Red
cutoff adjustment (R. CUTOFF),
4–6, 4–7, 4–10
gain adjustment (R. GAIN), 4–6,
4–7, 4–12
Red, green, and blue pattern, A–3
Red color missing, 2–6
Refresh rate
changing, 5–1
jumpers
deflection module, 3–13
power supply, 3–27
preset condition, 1–2
switch
deflection module, 3–13
Refresh rates
models, 5–1
Removal procedure

4 Index

Removal procedure (Cont.)
CRT/chassis assembly, 3–35
CRT socket, 3–33
deflection module, 3–10
degauss cable, 3–20
focus pack cable, 3–24, 3–26
interconnect cable, 3–9
LED cable, 3–23
power supply, 3–18, 3–25
rear cover, 3–2, 3–5
top cover, 3–6
video cable, 3–4
video casting assembly, 3–30,
3–34

Test screens (Cont.)
color bars patterns, A–5
Tools and equipment
anode discharge tool, 1–2
gloves, 1–2
metric measuring tape, 1–2
safety goggles, 1–2
static protection kit, 1–2
terminal technician tool kit, 1–2
Trapezoid adjustment, 4–25
Troubleshooting
before you start, 2–1
by symptom, 2–1
fault isolation, 2–1
procedures, 2–1
tables, 2–2

S
Safety goggles
handling CRT, 3–36
part number, 1–2
Schematics, B–1
Screen cleaner (VT3XX-SC), 4–2,
4–28
Southern Hemisphere
CRT/chassis assembly, 1–3
models, 1–2, 5–1
refresh rate, 5–1
Spares, 1–3
Static protection kit, 1–2
Switch
refresh rate, deflection module,
3–13
service, 4–11
Synchronization, loss of
see Table 2–3.

T
Terminal technician tool kit, 1–2
Test screens
all Es pattern, A–4
all-white pattern, A–2
central rectangle pattern, A–3
circle-crosshatch pattern, A–1

U
User controls, 4–8

V
VCEN adjustment, 4–17
Video cable
removal, 3–4
Video casting assembly
part number, 1–3
removal, 3–30, 3–34
VLIN adjustment, 4–16
VPARAB, 4–29
VPARAB adjustment, 4–27
VR320 monitor
adjustments, 4–1
aligning, 4–1
alignment screens, A–1
changing refresh rates, 5–1
cleaning, 4–2, 4–28
description, 1–1
documentation, B–1
models, 1–2
pixels, 1–2
product label, 5–2
refresh rates, 1–2

Index 5

VR320 monitor (Cont.)
removal and replacement
procedures, 3–1
troubleshooting, 2–2
user controls, 4–8

W
Width adjustments
HCEN, 4–19, 4–20
HLIN, 4–19, 4–20
HPHASE, 4–19, 4–20
WIDTH, 4–21