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EK-VR326-SV-001

August 1991

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Document:	VR326 Color Monitor Service Manual
Order Number:	EK-VR326-SV
Revision:	001
Pages:	76
Original Filename:

OCR Text

VR326 Color Monitor
Service Guide
Order Number EK-VR326-SV.001

Digital Equipment Corporation

First edition, August 1991
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.
Possession, use, duplication, or dissemination of the software described in this
documentation is authorized only pursuant to a valid written license from Digital or
the third-party owner of the software copyright.
No responsibility is assumed for the use or reliability of software on equipment that is not
supplied by Digital Equipment Corporation.
Copyright © Digital Equipment Corporation 1991
All Rights Reserved.
Printed in U.S.A.
The following are trademarks of Digital Equipment Corporation: DEC, Digital, and the
Digital logo.
This document was prepared and published by Educational Services Development and
Publishing, Digital Equipment Corporation.

Contents
Preface
1

Overview

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

1–1
1–2
1–2
1–2

Troubleshooting

2.1
2.2
2.3

vii

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

2–1
2–2
2–2

Removing and Replacing FRUs

3.1
3.1.1
3.1.2
3.1.3
3.2
3.2.1
3.2.2
3.2.3
3.2.4
3.2.5
3.2.6
3.3
3.4

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Removing External Cables . . . . . . . . . . . . . . . . . . . . . . . . .
Removing the Rear Cover . . . . . . . . . . . . . . . . . . . . . . . . .
Removing the Top Cover . . . . . . . . . . . . . . . . . . . . . . . . . .
Field Replaceable Units (FRUs) . . . . . . . . . . . . . . . . . . . . . . .
Removing the Interconnect Cable . . . . . . . . . . . . . . . . . . .
Removing the Power Supply Module . . . . . . . . . . . . . . . . .
Discharging the CRT and Removing the Anode Cap . . . . .
Removing the Deflection Module . . . . . . . . . . . . . . . . . . . .
Removing the Video Assembly . . . . . . . . . . . . . . . . . . . . . .
Removing the CRT/Bezel/Chassis Assembly . . . . . . . . . . . .
CRT Disposal (Trained Service Personnel Only) . . . . . . . . . .
Tilt-Swivel Base . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3–1
3–2
3–4
3–6
3–7
3–8
3–9
3–12
3–14
3–18
3–23
3–24
3–27
iii

iv Contents

Aligning the Video Monitor

4.1
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4–1
4.1.1
Before You Start . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4–2
4.1.2
Warm-Up Time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4–2
4.1.3
LEDs and Heater Filament . . . . . . . . . . . . . . . . . . . . . . . . 4–2
4.1.4
Video Screen Alignment Preparation . . . . . . . . . . . . . . . . . 4–3
4.2
Using the Radiance Meter . . . . . . . . . . . . . . . . . . . . . . . . . . . 4–4
4.3
Monitor Adjustments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4–6
4.3.1
Before Applying Power . . . . . . . . . . . . . . . . . . . . . . . . . . . 4–6
4.3.2
Geometry Adjustments . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4–9
4.3.3
Focus Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4–11
4.3.4
Cutoff Adjustments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4–12
4.3.5
Color/White Balance Adjustments . . . . . . . . . . . . . . . . . . . 4–14

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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

VR326 Specifications

VR326 Documentation

Index

A–1
A–2
A–3
A–4
A–5
A–5

Contents v

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
4–1
4–2
4–3
4–4
4–5
4–6
4–7
4–8
4–9
A–1
A–2
A–3
A–4
A–5
A–6

VR326 Color Monitor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Removing the Cables from the Monitor . . . . . . . . . . . . . . . . .
Removing the Rear Cover . . . . . . . . . . . . . . . . . . . . . . . . . . .
Removing the Top Cover . . . . . . . . . . . . . . . . . . . . . . . . . . . .
VR326 Field Replaceable Units . . . . . . . . . . . . . . . . . . . . . . .
Removing the Interconnect Cable . . . . . . . . . . . . . . . . . . . . .
Removing Cables from the Power Supply . . . . . . . . . . . . . . . .
Removing the Power Supply Module . . . . . . . . . . . . . . . . . . .
Discharging the CRT and Removing the Anode Cap . . . . . . .
Unplugging the Deflection Module Cables . . . . . . . . . . . . . .
Disconnecting Cables from the Deflection Module . . . . . . . . .
Removing the Deflection Module . . . . . . . . . . . . . . . . . . . . . .
Removing Cables from the Video Assembly . . . . . . . . . . . . . .
Removing the Shield from the Video Assembly . . . . . . . . . . .
Removing the CRT Socket Connector . . . . . . . . . . . . . . . . . . .
Removing the Video Assembly . . . . . . . . . . . . . . . . . . . . . . .
Crushing the Evacuation Point . . . . . . . . . . . . . . . . . . . . . . .
Tilt-Swivel Base . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Mark Center, Left, and Right Sides of Video Screen . . . . . . .
Radiance Meter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Using the Radiance Meter . . . . . . . . . . . . . . . . . . . . . . . . . . .
Adjustment Locations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
User Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
G2-Screen and Focus Adjustment Locations . . . . . . . . . . . . .
Adjustment Locations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Cutoff Adjustment Locations . . . . . . . . . . . . . . . . . . . . . . . . .
Gain Adjustment Locations . . . . . . . . . . . . . . . . . . . . . . . . . .
Circle-Crosshatch Pattern . . . . . . . . . . . . . . . . . . . . . . . . . . .
All-White Pattern . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Central Rectangle Pattern . . . . . . . . . . . . . . . . . . . . . . . . . . .
All ‘‘Es’’ Pattern . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Color Bars I Pattern . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Color Bars II Pattern . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1–1
3–3
3–5
3–6
3–7
3–8
3–10
3–11
3–13
3–15
3–16
3–17
3–19
3–20
3–21
3–22
3–26
3–28
4–3
4–4
4–5
4–7
4–8
4–9
4–11
4–13
4–15
A–1
A–2
A–3
A–4
A–5
A–5

vi Contents

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

Tools and Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
VR326 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
Monitor Physical Specifications . . . . . . . . . . . . . . . . . . . . . . .
Monitor Electrical Requirements . . . . . . . . . . . . . . . . . . . . . .
Monitor Environmental Specifications . . . . . . . . . . . . . . . . . .
Video Timing—1024 x 768 Resolution . . . . . . . . . . . . . . . . . .

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

Preface
This manual describes how to service the VR326 color monitor in the field.

Manual Organization
This manual covers the following topics:
•

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

•

Chapter 2 provides troubleshooting procedures.

•

Chapter 3 provides the removal and replacement procedures for the
field replaceable units (FRUs).

•

Chapter 4 provides the alignment procedures.

•

Appendix A shows sample alignment screens.

•

Appendix B lists the VR326 specifications.

•

Appendix C describes the related documentation.

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

Conventions
Warning

Provides information on personal safety.

Caution

Provides information to prevent damage to the equipment.

Note

Provides general information.

Refers to a part number.

Refers to an item in an illustration.

vii

1
Overview
1.1 Product Description
The VR326 color monitor (Figure 1–1) has a direct viewed antiglare screen
with an auto-ranging power supply for worldwide operation. Its built-in
tilt-swivel stand lets the user adjust the screen for viewing comfort. When
connected to a host system, the VR326 can display information sent by
the host.

MA-0299-90.DG

Figure 1–1

VR326 Color Monitor

1–1

1–2 Overview

1.1.1 Model Variations
The monitor is available in the following models:
Model

Applicable Area

VR326-DA 15" Color monitor

Northern Hemisphere

VR326-D4 15" Color monitor

Southern Hemisphere

1.2 Tools and Equipment
You need the following tools and equipment to service the VR326
monitor:
Table 1–1 Tools and Equipment
Item

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

1.3 Recommended Spare Parts
The following are the recommended spare parts for the VR326 monitor:
Table 1–2 VR326 Recommended Spare Parts
Part

Part Number

Power supply

54-19629-04

Deflection module

54-19828-01

Video assembly

70-27072-01

Module interconnect cable

70-27000-02

CRT/Bezel/Chassis assembly

70-27070-01

2
Troubleshooting
This chapter describes how to troubleshoot a VR326 color 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 detect burning components, turn power to the monitor off
and disconnect the power cord from the power source.
•

If a customer calls with a display quality type of problem, ask the
customer to leave the monitor on until you arrive to minimize the
warm-up time.

•

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 assembly, deflection module, or
power supply module, perform all the necessary adjustments.
Refer to Chapter 3.

2–1

2–2 Troubleshooting

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.
Troubleshoot the VR326 color monitor as follows:
1. Ask the operator to describe the problem.
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 five types of video problems
your VR326 monitor may exhibit:
•

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

•

A blank screen, without video, but with 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 in the referenced table 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.

Troubleshooting 2–3

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

Possible Cause

Suggested Solution

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

The power cord is not
connected.

Connect the power cord to
the power source or monitor.

Low or no power
exists at wall outlet.

Use another wall outlet.
If the problem continues, call
the facilities person.

The power supply
module is faulty.

Replace the power supply
module (Section 3.2.2).

The deflection module
is faulty.

Replace the deflection module
(Section 3.2.4).

The video assembly is
faulty.

Replace the video assembly
(Section 3.2.5).

The brightness or
contrast control is set
incorrectly.

Adjust the brightness and
contrast controls.

Power to the host
system is off.

Turn power to the host
system on.

The host signal cables
are disconnected.

Connect the signal cables
to the host and the monitor.

Internal cabling is
loose or faulty.

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

The signal cable is
faulty.

Replace the signal cable.

Cutoff is set
incorrectly.

Perform the Cutoff alignment
procedures (Section 4.3.4).

The deflection module
is faulty.

Replace the deflection module
(Section 3.2.4).

The video assembly is
faulty.

Replace the video assembly
(Section 3.2.5).

There is no video or
raster, but the power
indicator is on.

2–4 Troubleshooting

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

Possible Cause

Suggested Solution

The CRT/Bezel
/Chassis assembly
is faulty.

Replace the CRT/Bezel
/Chassis assembly
(Section 3.2.6) only after
trying all the previous
solutions.

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

Possible Cause

Suggested Solution

No video or cursor
can be seen even
when the contrast
control is set to
maximum; however,
the raster can
be displayed by
adjusting the
brightness control.

The host screen
saver is activated.

Press any key to reactivate the
display

The signal cable
is faulty.

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

The host system
is not supplying
video signals to the
monitor.

Connect the monitor to a
known working host and verify
the problem before replacing
any monitor modules.

The host system is
faulty.

Repair the host system.

Internal cabling is
loose or faulty.

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

The video assembly
is faulty.

Replace the video assembly
(Section 3.2.5).

The deflection
module is faulty.

Replace the deflection module
(Section 3.2.4).

The CRT/Bezel
/Chassis assembly is
faulty.

Replace the CRT/Bezel/Chassis
assembly (Section 3.2.6) only
after trying all the previous
solutions.

Troubleshooting 2–5

Table 2–3 Loss of Synchronization
Symptom

Possible Cause

Suggested Solution

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

The video cables are
faulty or connected
incorrectly.

Connect the video cables.

The 4-bar color
pattern is out of sync
and green is not
present.

The video cables are
connected incorrectly.

Swap the red and green video
cables to both the monitor and
the host system, then:
1. If green is present and in
sync, replace the video cable.
2. If green is not present, swap
the red and green video cables
to the monitor. If green is
displayed and in sync, repair
the host system.
After swapping the red and
green video cables, if the
display comes up green and
out of sync, go to the next
probable cause.

The 4-bar color
pattern is out of sync
and green is present.

The monitor or host
system is faulty.

If another VR326 monitor is
available, swap the monitors
to determine if the problem
continues.
If the problem continues,
repair the host system. If the
problem does not reoccur, the
problem is in the monitor.
If another VR326 monitor
is not available, replace
the deflection module
(Section 3.2.4).

The deflection
module is faulty.

Replace the deflection module
(Section 3.2.4).

2–6 Troubleshooting

Table 2–3 (Continued) Loss of Synchronization
Symptom

Possible Cause

Suggested Solution

The deflection
module is
functioning correctly,
but the video
assembly is faulty.

Replace the video assembly
(Section 3.2.5).

The deflection
module and the
video assembly are
functioning correctly,
but the host system
is faulty.

Repair the host system.

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

Possible Cause

Suggested Solution

The wrong color displays.
When the 4-color bar
pattern displays, the
primary colors do not
display in their proper
sequence.

The video cables are
crossed.

Swap the video cables.

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

The signal cable is
faulty.

Replace the signal
cable. Be sure the
cables are installed in
the correct connectors.

Troubleshooting 2–7

Table 2–4 (Continued) Color Problems
Symptom

Possible Cause

Suggested Solution

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

The host system is
faulty.

Repair the host system.

Green color is missing, but
the video is in sync.

Swap the 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.

The video assembly
is faulty.

Replace the
video assembly
(Section 3.2.5).

The CRT/Bezel
/Chassis assembly is
faulty.

Replace the CRT/Bezel
/Chassis assembly
(Section 3.2.6) only
after trying all the
previous solutions.

2–8 Troubleshooting

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

Possible Cause

Suggested Solution

Poor centering.

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

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

Poor geometry or
linearity.

The monitor is out of
adjustment.

Perform the appropriate
adjustments. Refer to
Chapter 4.

The deflection
module is faulty.

Replace the deflection module
(Section 3.2.4) and perform all
deflection adjustments.

The monitor needs to
be degaussed.

Press the degauss button to
correct color distortions.

Local magnetic fields
are present.

Remove any electro-mechanical
devices from the vicinity of the
monitor, or move the monitor
to another location.

CRT/Bezel/Chassis
assembly is faulty.

Replace the CRT/Bezel/Chassis
assembly (Section 3.2.6) only
after trying all the previous
solutions.

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

Troubleshooting 2–9

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

Possible Cause

Suggested Solution

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

The brightness or
contrast controls are
set incorrectly.

Adjust the brightness and
contrast controls.

The video assembly
is out of adjustment.

Perform the color adjustments.
Refer to Chapter 4.

The host system is
not supplying the
correct signal levels.

Repair the host system.

The video assembly
is faulty.

Replace the video assembly
(Section 3.2.5).

CRT wearout

Replace the CRT/Bezel/Chassis
assembly (Section 3.2.6) only
after all trying all the previous
solutions.

The video assembly
is not adjusted
correctly.

Perform all the color
adjustments. Refer to
Chapter 4.

Signal levels from
the host system
are not properly
balanced.

Repair the host system.

The video assembly
is faulty.

Replace the video assembly
(Section 3.2.6).

The CRT/Bezel
/Chassis assembly is
faulty.

Replace the CRT/Bezel/Chassis
assembly (Section 3.2.6) only
after trying all the previous
solutions.

Poor color balance.

2–10 Troubleshooting

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

Possible Cause

Suggested Solution

The display is not
clear or sharp.

Focus is out of
adjustment.

Perform the Focus adjustment.
Refer to Section 4.3.3.

Cutoff and Gain
settings are
incorrect.

Readjust the Cutoff and Gain
settings. Refer to Section 4.3.4.

Internal cabling is
loose or faulty.

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

The power supply
module is faulty.

Replace the power supply
module (Section 3.2.2).

The video assembly
is faulty.

Replace the video assembly
(Section 3.2.6).

The CRT/Bezel
/Chassis assembly is
faulty

Replace the CRT/Bezel/Chassis
assembly (Section 3.2.6) only
after trying all the previous
solutions.

There is ac
electromagnetic
interference from
adjacent power lines
or appliances.

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

The power supply
module is faulty.

Replace the power supply
module (Section 3.2.2).

The deflection
module is faulty.

Replace the deflection module
(Section 3.2.4).

Display characters
seem to flicker or
‘‘swim.’’

NOTE
If the monitor cannot be internally degaussed and the problem
is not caused by external magnetic fields, replace the CRT/Bezel
/Chassis assembly (Section 3.2.6) only after trying all the previous
solutions.

3
Removing and Replacing FRUs
3.1 Introduction
This chapter describes how to remove and replace the VR326 color
monitor field replaceable units (FRUs).
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 modules.
NOTE
If you twist the monitor while applying the tilt pressure, the
monitor moves more easily.
The procedures describe how to prepare the terminal to remove the FRUs.
To install each item, do the reverse of the removal procedure.
WARNING
Turn power to the monitor off. Disconnect the power cord from
the power source before performing any of these procedures.
NOTE
Any time you replace a video assembly, deflection module, or
power supply module, perform all the necessary adjustments in
Chapter 4.

3–1

3–2 Removing and Replacing FRUs

3.1.1 Removing External Cables
Remove the external cables (Figure 3–1) as follows:
1. Make sure the power switch is off (out).
2. Unplug the power cord from the wall outlet first, then from the
monitor. Turn the power switch on and off after removing the power
cord to discharge the internal modules.
3. Remove the three video signal cables from the rear of the monitor.
NOTE
Push each connector in and rotate it counter-clockwise until the
signal cable is released from the connector.

Removing and Replacing FRUs 3–3

Power Cord

R
G
B

RGB Signal Cables

Power Source
From Host System
MA-0606-90.DG

Figure 3–1

Removing the Cables from the Monitor

3–4 Removing and Replacing FRUs

3.1.2 Removing the Rear Cover
NOTE
Before removing any FRUs, you must remove the rear cover and
the top cover.
Remove the rear cover as follows:
1. Remove the external cables (Section 3.1.1).
2. Use a Phillips screwdriver to remove the four screws that hold the
rear cover to the enclosure (Figure 3–2).
3. Remove the rear cover by pulling the cover towards you.

Removing and Replacing FRUs 3–5

MA-0607-90.DG

Figure 3–2

Removing the Rear Cover

3–6 Removing and Replacing FRUs

3.1.3 Removing the Top Cover
Remove the top cover as follows:
1. Remove the rear cover (Section 3.1.2).
2. Tilt the top cover up and slide it toward the rear of the monitor.
(Figure 3–3).
Top
Cover

MA-0608-90.DG

Figure 3–3

Removing the Top Cover

Removing and Replacing FRUs 3–7

3.2 Field Replaceable Units (FRUs)
The VR326 monitor FRUs are shown in Figure 3–4. The video assembly
may look different in newer models.
WARNING
Turn the power off and disconnect the power cord from the wall
outlet before disconnecting or replacing any FRU.
CRT Chassis
Assembly

Power
Supply

Deflection
Module
Interconnect
Cable
Video Casting
Assembly

Figure 3–4

VR326 Field Replaceable Units

MA-0609-90.DG

3–8 Removing and Replacing FRUs

3.2.1 Removing the Interconnect Cable
Remove the rear cover (Section 3.1.2) and unplug the interconnect cable.
Refer to (Figure 3–5)) for the plug locations.
FRU

Connector

Interconnect Cable Plug

Power supply (right)

P1 1

Video assembly (center)

P2 2

Deflection module (left)

P3 3

1
2
3

Interconnect
Cable
MA-0610-90.DG
LJ-00778-TI0

Figure 3–5

Removing the Interconnect Cable

Removing and Replacing FRUs 3–9

3.2.2 Removing the Power Supply Module
Remove the power supply module as follows:
1. Remove the rear cover (Section 3.1.2), the top cover (Section 3.1.3),
and the interconnect cable (Section 3.2.1).
2. Disconnect the 3-wire, 5-pin on/off switch cable (P4) from the
connector (J4) at the top of the power supply module by pressing
the tab on top of the connector (Figure 3–6).
3. Disconnect the 2-wire, 2-pin degauss cable (P10) from the connector
(J10) on the power supply module by pressing the tabs on the sides of
the plug (Figure 3–6).

3–10 Removing and Replacing FRUs

2-Wire, 2-pin
Degauss
Cable

3-Wire, 5-Pin,
On/Off Switch
Cable

MA-0611-90.DG
LJ-00779-TI0

Figure 3–6

Removing Cables from the Power Supply

Removing and Replacing FRUs 3–11

4. Loosen the captive screw that holds the power supply to the chassis
(Figure 3–7).
5. Slide the power supply module out of the card guides.

Power
Supply

MA-0612-90.DG
LJ-00780-TI0

Figure 3–7

Removing the Power Supply Module

3–12 Removing and Replacing FRUs

3.2.3 Discharging the CRT and Removing the Anode Cap
Discharging the CRT drains to ground any leftover voltages that remain
in the extra-high tension (EHT) cable after power is removed. Discharge
the CRT as follows:
1. Remove the rear cover (Section 3.1.2) and the top cover (Section 3.1.3).
WARNING
The following steps expose you to the CRT anode, which may
store a high voltage. Keep your free hand away from any part
of the monitor during the anode discharge process.
2. Attach the clip end of the anode discharge tool (PN 29-24717-00) to a
chassis ground point near the CRT anode.
3. 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.
NOTE
Be careful 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.

Removing and Replacing FRUs 3–13

4. Remove the CRT anode cap from the CRT (Figure 3–8).

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-0613-90.DG

Figure 3–8

Discharging the CRT and Removing the Anode Cap

3–14 Removing and Replacing FRUs

3.2.4 Removing the Deflection Module
Remove the deflection module as follows:
CAUTION
Use a static protection kit (PN 29-26246-00) when handling the
deflection module.
1. Remove the rear cover (Section 3.1.2), the top cover (Section 3.1.3),
and the interconnect cable (Section 3.2.1).
2. Discharge the CRT and remove the anode cap (Section 3.2.3).
WARNING
You must discharge the CRT before removing the anode.
3. Loosen the captive screw that holds the deflection module to the
chassis (Figure 3–9).
4. Disconnect the 1-wire, 3-pin G2 cable (P7) from the connector (J7)
on the left side of the video assembly by pressing on the sides of the
connector and pulling.

Removing and Replacing FRUs 3–15

8-Wire, 8-Pin
Brightness/
Contrast
Cable

MA-0614-90.DG
LJ-00781-TI0

Figure 3–9

Unplugging the Deflection Module Cables

3–16 Removing and Replacing FRUs

5. Disconnect the 6-wire, 9-pin raster control cable (P6) from the
connector (J6) 1 (Figure 3–10).
6. Disconnect the 4-wire, 9-pin CRT/Yoke cable (P11) from connector
(J11) 2 .
7. Remove the Focus cable from the bracket assembly above the video
assembly and disconnect the cable (P8) from (J8) 3 .

6-Wire, 9-Pin,
Raster Control
Cable

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

1
2

Focus Cable

MA-0534-90.DG

Figure 3–10

Disconnecting Cables from the Deflection Module

Removing and Replacing FRUs 3–17

8. Slide the deflection module out of the card guides (Figure 3–11) being
careful to move any cables out of the way.

Card
Guide

Deflection
Module

MA-0615-90.DG

Figure 3–11

Removing the Deflection Module

3–18 Removing and Replacing FRUs

3.2.5 Removing the Video Assembly
Remove the video assembly as follows:
1. Remove the rear cover (Section 3.1.2), the top cover (Section 3.1.3),
and the interconnect cable (Section 3.2.1).
2. Disconnect the 1-wire, 3-pin G2 cable (P7) from the connector (J7)
to the left of the video assembly (Figure 3–12). (The Video Assembly
may look different in newer models.)
3. Disconnect the 8-wire, 8-pin brightness/contrast cable (P5) from the
connector (J5) at the bottom of the video assembly by pressing the top
center tab on the connector. Place it out of the way behind the video
assembly.

Removing and Replacing FRUs 3–19

Foc us
Cable

1-Wire, 3-Pin
Cable

8-Wire, 8-Pin

Brightness/
Contrast
Cable

MA-0616-90.DG
LJ-00782-TI0

Figure 3–12

Removing Cables from the Video Assembly

3–20 Removing and Replacing FRUs

4. Remove the Focus cable from the bracket assembly above the video
assembly and disconnect the cable (P8) from (J8).
5. If present, pry the shield off the video assembly with a flat-blade
screwdriver (Figure 3–13).
V ideo
A s s em bly

S hield

MA-0617-90.DG
LJ-00783-TI0

Figure 3–13

Removing the Shield from the Video Assembly

Removing and Replacing FRUs 3–21

6. Pull the CRT socket connector straight toward you and off the pins
(Figure 3–14).
CAUTION
Use care not to bend the pins when you disconnect the CRT
socket from the neck of the CRT.

CRT
Socket
Connector

MA-0618-90.DG

Figure 3–14

Removing the CRT Socket Connector

3–22 Removing and Replacing FRUs

7. Loosen the captive screw at the top of the video assembly
(Figure 3–15).
8. Gently pull the top of the video assembly towards you and lift it up
and out of the chassis.

MA-0646-90.DG

Figure 3–15

Removing the Video Assembly

Removing and Replacing FRUs 3–23

CAUTION
When you install the video assembly, carefully push the CRT
socket connector onto the CRT neck. Use care not to bend the
pins during this procedure.

3.2.6 Removing the CRT/Bezel/Chassis Assembly
Remove the CRT/Bezel/Chassis assembly as follows:
1. Remove the rear cover (Section 3.1.2), the top cover (Section 3.1.3),
and the interconnect cable (Section 3.2.1).
2. Remove the power supply module (Section 3.2.2)
3. Discharge the CRT and remove the anode cap (Section 3.2.3).
WARNING
You must discharge the CRT and remove the anode cap
(Section 3.2.3) before removing the deflection module.
4. Remove the deflection module (Section 3.2.4)
5. Remove the video assembly (Section 3.2.5)
NOTE
After removing these FRUs, the CRT/Bezel/Chassis assembly is all
that remains to be removed.

3–24 Removing and Replacing FRUs

3.3 CRT Disposal (Trained Service Personnel Only)
This section describes how to safely dispose of the monitor cathode-ray
tube (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 three inches 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 while removing
and replacing a CRT.
Handling a CRT
•

Never handle the CRT by the neck. Always use two hands and hold
the CRT by the sides near the face. CRT’s build a charge even while
idle.

•

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.

Removing and Replacing FRUs 3–25

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 injuring 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.
1. Remove the FRUs listed in Section 3.2.6.
2. Place the old CRT/Bezel/Chassis assembly and the original packing
material in the container from which you removed the new CRT/Bezel
/Chassis assembly.
3. Using pliers, slowly crush, but do not snap, the evacuation point
(Figure 3–16). 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.

3–26 Removing and Replacing FRUs

MA-X0667-88

Figure 3–16

Crushing the Evacuation Point

4. Seal the carton with packing tape and dispose of it in the Digital site’s
trash receptacle.
NOTE
The safe removal of air from the CRT is necessary to prevent
safety problems that may arise from accidental CRT implosion.

Removing and Replacing FRUs 3–27

3.4 Tilt-Swivel Base
Helpful Hint: During normal use the tilt-swivel base should not come
off the unit. There is a retainer plug in the center of the swivel retainer
(74-39791-01) to hold the base on. If the tilt-swivel base should come off
and the retainer teeth are not broken, you do not have to take the monitor
apart. Use the following procedure to put the tilt-swivel base back on the
monitor.
1. Place the monitor, screen side down, on a soft pad.
2. Align the tilt-swivel base with the wider part downward toward the
screen (Figure 3–17).
3. Place a curved tool, like a long hex-head wrench, through the center
of the swivel retainer inside the base.
4. While pressing on the base with one hand, pull the swivel retainer
toward the base until the retainer’s teeth click into position.
5. Install a retainer plug (74-41176-01) in the retainer to keep the teeth
apart.

3–28 Removing and Replacing FRUs

Teeth of
Swivel
Clamp

Monitor
Base

Monitor
(Bottom
View)

MA-0239-90.DG

Figure 3–17

Tilt-Swivel Base

4
Aligning the Video Monitor
4.1 Introduction
This chapter describes the monitor alignment procedures. Depending
on which FRU has been replaced and the symptom indicated by the
customer, perform the procedures for that part.
NOTE
If a customer calls with a display quality type of problem, ask the
customer to leave the monitor on until you arrive to minimize the
warm-up time.
For these procedures, you need the following equipment:
•

Metric measuring tape (PN 29-25342-00)

•

19XE radiance meter

•

Video screen cleaner (PN VT3XX-SC)

•

Low-tack adhesive tape (not provided)

•

Red china pencil (not provided).

Check the adjustments in the order presented, as the success of one
adjustment may depend on the accuracy of the preceding adjustments
(except the Focus and G2 adjustments). If a setting is already correct, you
can skip that adjustment and go on to the next one.

4–1

4–2 Aligning the Video Monitor

4.1.1 Before You Start
You must use specific alignment screens to make adjustments. The
alignment screens are shown in Appendix A. Refer to your host system
service guide to set up these screens.
Clean the Screen
Clean the screen using a soft tissue or cloth and a non-abrasive,
nonflammable glass cleaner, or use Digital’s video screen cleaner (PN
VT3XX-SC).
Remove the Monitor Covers
Before you perform any adjustments, set up the monitor as follows:
1. Place the monitor on a nonconductive surface.
2. Remove the rear cover (Section 3.1.2)
3. Remove the top cover (Section 3.1.3).
4. Rotate the monitor so it faces east.
5. Reconnect the video cable.
6. Reconnect the power cord.

4.1.2 Warm-Up Time
If you replaced any FRU, refer to Section 4.1.4; otherwise, turn the power
on and wait for a raster video pattern.
If the customer had the system on when you arrived, after you remove
the rear cover and reconnect the power cord, only a 5 minute warm-up is
needed to check the monitor. Otherwise, let the monitor warm up for at
least 20 minutes before performing any adjustments. The warm-up time
ensures that the electron gun is at a stable temperature before you do any
adjustments.

4.1.3 LEDs and Heater Filament
Visually check the monitor to ensure that the following components are
on:
•

LED on the power switch

•

LED on the deflection module

•

CRT heater filament.

Aligning the Video Monitor 4–3

4.1.4 Video Screen Alignment Preparation
Use a metric measuring tape to measure the dimensions on the screen
display. To avoid scratching the screen with the tape’s metal clip, start
the measurement at the 10 cm. mark on the tape. See Figure 4–1.
Use low-tack adhesive tape to mark off positions on the bezel window as
follows:
1. Horizontal and vertical center position
2. Right and left side, 265 mm apart, centered approximately at the
horizontal-vertical center position (Figure 4–1)

199 mm

265 mm

LJ-00784-TI0

Figure 4–1

Mark Center, Left, and Right Sides of Video Screen

4–4 Aligning the Video Monitor

4.2 Using the Radiance Meter
Use the radiance meter as follows:
1. Remove the 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.
2. Connect the ac line adapter to the radiance meter and plug it into a
wall outlet.

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

3. Turn the power on.
NOTE
Do not use the POWER ON W/BACKLIGHT position when you
are using the radiance meter with batteries.
4. Ensure that your radiance meter is in calibration. 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 to draw a circle around the occluder.
NOTE
You must take all meter readings with the meter centered in
this circle.

MA-1350-89.DG

Figure 4–3

Using the Radiance Meter

4–6 Aligning the Video Monitor

4.3 Monitor Adjustments
The location of the internal controls and adjustments are shown in
Figure 4–4. If possible, position yourself so the screen is on your left and
the adjustments are on your right.

4.3.1 Before Applying Power
If the Deflection Board has been replaced...
Perform steps 1 and 2; otherwise, go to step 3.
1. Mark off the screen as described in Section 4.1.4.
2. Set the G2-SCREEN control to minimum (fully CCW).

If the Video Board has been replaced...
Perform steps 3 through 5; otherwise, continue with step 6.
3. Set the R CUTOFF and B CUTOFF adjustments at their midpoints.
4. Set the R GAIN, G GAIN, and B GAIN adjustments at their
midpoints.
5. On the deflection board:
a. Set the G2-SCREEN control to minimum (fully CCW).
b. Set the SERVICE switch to the Normal position.

Aligning the Video Monitor 4–7

Service
Switch
HLin
LED

HCen

Width
Trap

G2-Screen

VLin
Height
VHold

Focus

HHold
HPhase
VCen

Blue Cutoff

Blue Gain
Red Cutoff
Red Gain
Green Gain

LJ-00785-TI0

Figure 4–4

Adjustment Locations

4–8 Aligning the Video Monitor

Set User Controls...
6. Set the CONTRAST control to minimum (CCW).
7. Set the BRIGHTNESS control to maximum (CW).
8. Set the HORIZONTAL CENTERING and VERTICAL CENTERING
thumbwheels at their mid-points (detents).
9. Turn the power on.

Horizontal Vertical
Centering Centering

P o we r S wit c h /
I n d ic a t o r

Co n t ra s t

Brightness

DeGauss

LJ-00786-TI0

Figure 4–5

User Controls

Aligning the Video Monitor 4–9

4.3.2 Geometry Adjustments
If the deflection board has been replaced, adjust the geometry of the
display as follows. Unless otherwise noted, all adjustments are performed
on the deflection board.
1. Slowly turn CW (G2-SCREEN) until a raster with white horizontal
retrace lines displays.
2. Now back off G2 just until only the white horizontal retrace lines
disappear. The resulting raster display should be light gray with no
visible retrace lines.

Focus
G 2 S c re e n

LJ-00787-TI0

Figure 4–6

G2-Screen and Focus Adjustment Locations

4–10 Aligning the Video Monitor

3. Adjust WIDTH fully CCW for minimum raster width.
4. Adjust HLIN so that the left edge of the raster is at maximum width.
(You may have to adjust HCEN to see the left edge of the raster.)
5. Now back off HLIN to reduce the left edge of the raster by
approximately 5 mm.
6. Adjust HCEN to center the raster in the CRT glass. If needed,
decrease the WIDTH adjustment so that both edges of the raster are
visible.
7. Set the CONTRAST control to maximum.
8. Display the Circle/Crosshatch video pattern and, while observing an
area at the center of the screen, adjust FOCUS.
9. Adjust VCEN so that the pattern is vertically centered in the bezel.
10. Adjust HEIGHT so that the top and bottom lines of the pattern are
199 mm apart.
11. Adjust VLIN so that the height of all squares on the center vertical
axis, from top to bottom, are equal.
12. Adjust HPHASE so that the center vertical line of the pattern is
aligned with the adhesive tape marking the horizontal-vertical center
reference position.
13. Adjust WIDTH so that the right side of pattern is aligned with the
marked right side reference position.
14. Adjust HLIN so that the left side of the pattern is aligned with the
marked left side reference position.
15. Adjust TRAP so the viewing area of the screen does not form a
trapezoid (top edge smaller or larger than bottom edge).
16. Adjust PIN so the sides do not bow in or bow out.
17. Go back to step 12 and repeat this procedure until all three positions
are aligned with the reference positions.
18. Remove the reference adhesive tape from the screen. With a suitable
cleaner, remove any marks or residual adhesive from the screen.

Aligning the Video Monitor 4–11

4.3.3 Focus Adjustment
Display a convenient focusing pattern, such as an ‘‘All Es’’ pattern or the
Circle/Crosshatch video pattern and proceed as follows:
1. Set the CONTRAST control to minimum (CCW).
2. Adjust the BRIGHTNESS control to raster extinction.
3. Set the CONTRAST control to maximum.
4. While observing the upper-left corner of the screen, adjust FOCUS.
S e rvice
S wit ch
HL in
LED

HCe n

Width
Trap
VLin

Fo cu s

H eight
VH old
H H old
H Phase
VC en

LJ-00788-TI0

Figure 4–7

Adjustment Locations

4–12 Aligning the Video Monitor

4.3.4 Cutoff Adjustments
If the video board has been replaced, adjust the cutoff controls as follows.
Unless otherwise noted, all adjustments are performed on the video board.
1. Set R CUTOFF and B CUTOFF adjustments fully CCW.
2. Set R GAIN, G GAIN, and B GAIN adjustments fully CCW.
3. Position the radiance meter in the middle of the screen.
4. On the deflection board, slowly turn CW (G2-SCREEN) for 0.0046
reading on the radiance meter. The resulting raster should be green
in color with no horizontal retrace lines.
5. Adjust the BRIGHTNESS control to minimum.
6. On the deflection board, set the SERVICE switch to ‘‘Service’’ position.
7. Adjust the BRIGHTNESS control just until a single green horizontal
line appears.
CAUTION
Do not over adjust; a very bright line may permanently burn
the screen.
8. Adjust the BRIGHTNESS control just until the green horizontal
line disappears. Do not adjust the BRIGHTNESS control for the
remainder of this Cutoff Control adjustment procedure.
9. Turn CW (R CUTOFF) just until a single red horizontal line appears.
CAUTION
Do not over adjust.
10. Adjust R-CUTOFF just until the red horizontal line disappears.
11. Turn CW (B CUTOFF) just until a single blue horizontal line appears.
CAUTION
Do not over adjust.
12. Adjust B CUTOFF just until the blue horizontal line disappears.
13. On the deflection board, set the SERVICE switch to Normal position.

Aligning the Video Monitor 4–13

14. If the previous adjustments are correct, the screen should be totally
black with an absence of raster. If not, repeat Section 4.3.4 until the
screen is black.

Service Switch
Focus
G2 Screen

B l u e Cu t o f f

Blu e G a in
Re d Cu t o f f
Re d G a in
G r e e n G a in

LJ-00789-TI0

Figure 4–8

Cutoff Adjustment Locations

4–14 Aligning the Video Monitor

4.3.5 Color/White Balance Adjustments
If the video board has been replaced, adjust the color and white balance
as follows. Unless otherwise noted, all adjustments are performed on the
video board.
1. Adjust the CONTRAST control to minimum.
2. Adjust the BRIGHTNESS control to raster extinction.
3. Set the CONTRAST control to maximum.
4. Position the radiance meter in the middle of the screen and complete
steps 5 through 8 in the next table. Repeat steps 5 through 8 until
you achieve the final check of approximately 0.451 meter reading.

Step Display Video Pattern...

Adjust...

Turn

Radiance Meter
Reading...

Red-50%-Central-Rectangle

R GAIN

0.135

Green-50%-Central-Rectangle

G GAIN

0.159

Blue-50%-Central-Rectangle

B GAIN

0.159

White-50%-Central-Rectangle

0.451 (final check)

9. Repeat the FOCUS adjustment (Section 4.3.3).

Aligning the Video Monitor 4–15

Focus

B lue C u t o f f

Blu e G a in
Re d Cu t o f f
Re d G a in
G r e e n G a in

LJ-00790-TI0

Figure 4–9

Gain Adjustment Locations

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 your 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
You can 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
You can 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
VR326 Specifications
The following are the physical specifications for the VR326 color monitor.
Table B–1 Monitor Physical Specifications
Specifications

Value

Height

38 cm (15 in)

Width

38 cm (15 in)

Depth

39.6 cm (15.6 in)

Weight

17.2 kg (38 lbs)

Tilt range

20° (5° forward to 15° backward)

Swivel range

±90° (left and right)

Cathode ray tube (CRT)

38 cm (15 in) diagonal

Display area

1024 pixels horizontal x 768 lines vertical.
Approximate picture size = 199 mm (7.8 in)
x 265 mm (10.4 in) with a 4:3 aspect ratio.

B–1

B–2 VR326 Specifications

The following are the electrical requirements for the VR326 color
monitor.
Table B–2 Monitor Electrical Requirements
Requirement

Value

AC input voltage

90 to 128 Vac or 190 to 256 Vac,
auto-ranging, single phase, 3-wire

Line frequency

49 to 61 Hz

Power consumption

240 watts maximum

Video timing

See Table B–4.

Video output

53.5% nominal (light transmissivity)

Video input

Red (with sync) 1 Vpp, 75 ohm, ac or dc
coupled
Green (with sync) 1 Vpp, 75 ohm, ac or dc
coupled
Blue (with sync) 1 Vpp, 75 ohm, ac or dc
coupled

The following are the environmental specifications for the VR326 color
monitor.
Table B–3 Monitor Environmental Specifications
Specifications

Value

Operating temperature

10° to 40° C (50° to 104° F)

Humidity

10% to 90% relative humidity
Maximum wet bulb = 28° C
Minimum dew point = 2° C (noncondensing)

VR326 Specifications

Table Table B–4 lists the horizontal and vertical timing specifications.
Table B–4 Video Timing—1024 x 768 Resolution
Horizontal frequency

57.384 kHz

Vertical frequency

72.033 Hz

Pixel frequency

74.370 MHz

Pixel period

13.446 ns

Horizontal Timing

no. pixels

Entire line

1296

17.43

Active visible line

1024

13.77

Blanking interval

272

3.66

Sync front porch

0.215

Sync pulse

128

1.721

Sync back porch

128

1.721

Vertical Timing

no. lines

Vertical period
(entire frame)

797

13.889

Visible raster

768

13.384

Blanking interval

0.505

Sync front porch

0.0174

Sync pulse

0.1046

Sync back porch

0.3834

µs

B–3

C
VR326 Documentation
In addition to this guide, you can order the following VR326 documents
from Digital. Some of the documents listed are available in several
languages. Please contact your sales representative for availability and
more information.
Installing and Using the VR326 Color Monitor
EK-VR326-IN
This guide provides users with the information needed to install, operate
and maintain the VR326 monitor. The manual also describes all controls
and indicators.
VR326 Color Monitor IPB
EK-VR326-IP
This document provides a detailed parts breakdown of the VR326 field
replaceable parts. The documents do not contain part numbers for
components on the printed circuit modules. However, these components
are listed in the Field Maintenance Print Set, ordered separately.
VR326 Field Maintenance Print Set
MP-03005-01
This document provides a field maintenance set of electrical and
mechanical schematic diagrams for the VR326 color monitor.

C–1

Index
A
AC input voltage, B–2
Adjustments
B CUTOFF, 4–6, 4–12
B GAIN, 4–6
blue, 4–15
BRIGHTNESS, 4–6, 4–8, 4–11,
4–12
CONTRAST, 4–8, 4–11
FOCUS, 4–11
G2-SCREEN, 4–6, 4–9, 4–12
GAIN, 4–14, 4–15
geometry, 4–9
G GAIN, 4–6
green, 4–15
HCEN, 4–10
HLIN, 4–10
HPHASE, 4–10
PIN, 4–10
R CUTOFF, 4–6, 4–12
red, 4–15
R GAIN, 4–6
TRAP, 4–10
VCEN, 4–10
VLIN, 4–10
white balance, 4–14
WIDTH, 4–10
Alignment
procedure, 4–1, 4–7
screens
all Es, A–4
all-white pattern, A–2
central rectangle pattern,
A–3

Alignment
screens (Continued)
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, 3–12
removal, 3–12, 3–14
Audience, vii

B
Base
retainer, 3–27
tilt-swivel, 3–27
B CUTOFF adjustment, 4–6, 4–12
B GAIN adjustment, 4–6
Blank screen
without video but raster
see Table 2–2.
without video or raster
see Table 2–1.
Blue color missing, 2–6
BRIGHTNESS adjustment, 4–6,
4–8, 4–11, 4–12
Brightness/contrast
cable, 3–18

C
Cable
brightness/contrast, 3–18
CRT/yoke, 3–16
focus, 3–20

Index 1

2 Index

Cable (Continued)
G2, 3–14
interconnect, 3–8
raster control, 3–16
removal, 3–2
Central rectangle pattern, A–3
Circle-crosshatch pattern, A–1
Cleaning the screen, 4–2
Color
adjustments, 4–14
bars
II pattern, A–5
I pattern, A–5
distortion
color/white balance, 4–14
cutoff adjustments, 4–12
degauss button, 4–8
problems
see Table 2–4.
video input, B–1
CONTRAST adjustment, 4–8, 4–11
Conventions, vii
CRT
anode removal, 3–12, 3–14
dimensions, B–1
discharging procedure, 3–12
display area, B–1
disposal, 3–24
disposal procedure, 3–25
handling, 3–24
light transmissivity, B–1
socket connector, 3–21
stocking and storage, 3–24
CRT/chassis assembly
northern hemisphere, 1–2
part number, 1–2
removal, 3–23
southern hemisphere, 1–2
Cutoff
adjustment locations, 4–13

D
Deflection module
part number, 1–2
removal, 3–14, 3–17
Degauss button, 4–8
Dimensions, B–1
Discharging CRT, 3–12, 3–14
Display area, B–1
Disposing of CRT, 3–24, 3–25
Documentation
IPB, C–1
print set, C–1

E
Electrical requirements, B–2
Es pattern, A–4

F
Field maintenance print set, C–1
Field replaceable units (FRUS), 3–7
Flicker, 2–10
Focus
adjustment, 4–11
cable, 3–20

G
G2 cable, 3–14, 3–18
G2-SCREEN adjustment, 4–6, 4–9,
4–12
Gain adjustments, 4–14, 4–15
Geometry adjustments, 4–9
G GAIN adjustment, 4–6
Gloves
handling CRT, 3–25
part number, 1–2
Green color missing, 2–6

Index 3

Handling CRT, 3–24
HCEN adjustment, 4–10
HLIN adjustment, 4–10
HPHASE adjustment, 4–10
Humidity
dew point, B–2
wet bulb, B–2
Hz, B–2

Northern hemisphere
CRT/chassis assembly, 1–2
model, 1–2

I
Installing
tilt-swivel base, 3–27
Interconnect cable
part number, 1–2
removal, 3–8

L
Light transmissivity, B–1
Line frequency, B–2

O
Occluder, 4–5
Operating
humidity, B–2
temperature, B–2

P
PIN adjustment, 4–10
Plug, base retainer, 3–27
Poor display quality
see Table 2–5.
Power consumption, B–2
Power supply
part number, 1–2
removal, 3–9
Print set, C–1
Product description, 1–1

M
Magnetic fields
affect on monitor, 2–1
Metric measuring tape, 1–2
Model variations
northern hemisphere, 1–2
southern hemisphere, 1–2
Monitor adjustments
if deflection board is replaced,
4–6, 4–9
if video board is replaced, 4–6,
4–12

R
Radiance meter
part number, 4–1
using, 4–4, 4–5
R CUTOFF adjustment, 4–6, 4–12
Rear cover removal, 3–4
Recommended spare part, 1–2
Red, green, and blue
input, B–1
pattern, A–3
Red color missing, 2–6
Removing
anode from CRT, 3–12, 3–14
cables, 3–2

4 Index

Removing (Continued)
CRT/chassis assembly, 3–23
CRT socket connector, 3–21
CRT/yoke cable, 3–16
deflection module, 3–14, 3–17
FRUs, 3–1
interconnect cable, 3–8
power supply module, 3–9
raster control cable, 3–16
rear cover, 3–4
top cover, 3–6
video assembly, 3–18, 3–23
video assembly shield, 3–20
Resolution, B–1, B–2
Retainer, base, 3–27
R GAIN adjustment, 4–6

S
Safety goggles
handling CRT, 3–25
part number, 1–2
Schematics, C–1
Screen cleaner, 4–1
screen xs>cleaning, 4–2
Service switch
normal position, 4–6
service position, 4–13
Southern hemisphere
CRT/chassis assembly, 1–2
model, 1–2
Spare parts, 1–2
Specifications, B–1
Static protection kit, 1–2, 3–14
Storing CRT, 3–24
Switch service, 4–6, 4–13
Synchronization, loss of
see (Table 2–3).

T
Tape
adhesive, 4–1, 4–3
measuring, 4–1, 4–3
Temperature, operating, B–2
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
color bars patterns, A–5
Tilt-swivel base
installation, 3–27
range, B–1
retrainer, 3–27
Timing specifications, B–2
Tools and equipment
gloves, 1–2
Top cover removal, 3–6
TRAP adjustment, 4–10
Troubleshooting
before you start, 2–1
by symptom, 2–2
fault isolation, 2–1
procedures, 2–2
tables, 2–2

U
User controls, 4–8

V
VCEN adjustment, 4–10
Video
input, B–1
resolution, B–1, B–2
timing, B–2
Video assembly
part number, 1–2

Index 5

Video assembly (Continued)
removal, 3–18, 3–23
Video assembly shield
removal, 3–20
Video casting assembly
See Video assembly
VLIN adjustment, 4–10
VR326 monitor
adjustment locations, 4–7
aligning, 4–1
alignment screens, A–1
color adjustments, 4–7
description, 1–1
documentation, C–1

models, 1–2
specifications, B–1
troubleshooting, 2–2
user controls, 4–8
warm-up time, 4–2

W
Warm-up time, 4–2
Watts, B–2
Weight, B–1
White balance adjustments, 4–14
WIDTH adjustment, 4–10