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EK-VRC21-HX-B01

January 1994

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Document:	VRC21-Hx Multi-Scanning Digital Control Monitor Inst/Oper Info
Order Number:	EK-VRC21-HX
Revision:	B01
Pages:	30
Original Filename:

OCR Text

VRC21-Hx Multi-Scanning
Digital Control Color Monitor
Installation and Operating
Information
Order Number: EK–VRC21–HX. B01

Important Warnings Inside

January 1994
The information in this document is subject to change without notice and should not
be construed as a commitment by Digital Equipment Corporation.
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.
FCC ID: A09-VRC21
Note: This equipment has been tested and found to comply with the limits for
a Class B digital device, pursuant to Part 15 of the FCC rules. These limits
are designed to provide reasonable protection against harmful interference in a
residential installation. Any changes or modifications made to this equipment may
void the user’s authority to operate this equipment.
This equipment generates, uses, and can radiate radio frequency energy and, if
not installed and used in accordance with the instructions, may cause harmful
interference to radio and television reception; however, there is no guarantee that
interference will not occur in a particular installation. If this equipment does cause
harmful interference to radio or television reception, which can be determined by
turning the equipment off and on, the user is encouraged to try to correct the
interference by one or more of the following measures:
Re-orient or relocate the receiving antenna.
Increase the separation between the equipment and the receiver.
Connect the equipment to an outlet on a circuit different from that to which
the receiver is connected.
Consult the dealer or an experienced radio/TV technician for help.
The video input to this device is through the 5 BNC connectors located at the rear of
the device. The optional 15-pin D sub-miniature connector at the rear of the device
is not a supported option and shall not be connected to any cable at the same time
as the 5 BNC connectors are connected to cables, as this will cause video quality
degradation, and may cause increased levels of radio frequency interference.
There are no user serviceable parts inside. Do not attempt to modify
this equipment. If modified, your authority to operate this equipment
might be voided by the FCC.
Canadian Department of Communications (DOC) Statement
This digital apparatus does not exceed the Class B limits for radio noise emissions
from digital apparatus as set out in the radio interference regulations of the Canadian
Department of Communications.
DEC and the DIGITAL logo are trademarks of Digital Equipment Corporation. The
Energy Star emblem does not represent EPA endorsement of any product or service.
Copyright © Digital Equipment Corporation 1994.
All rights reserved.
Printed in Japan.

This document was prepared using VAX DOCUMENT Version 2.1.

Contents
About This Guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1 Installation
1.1
1.2

Monitor Installation . . . . . . . . . . . . . . . . . . . . .
Turn On Power to Monitor . . . . . . . . . . . . . . . .

1–1
1–3

2 Servicing
2.1
Cleaning the Monitor . . . . . . . . . . . . . . . . . . . .
2.2
Maintenance and Troubleshooting . . . . . . . . . .
2.2.1
Identifying and Correcting Problems . . . . .
2.2.2
Troubleshooting Table . . . . . . . . . . . . . . . .
2.3
Adjustment Mode . . . . . . . . . . . . . . . . . . . . . . .
2.3.1
Adjustment Codes . . . . . . . . . . . . . . . . . . .
2.3.2
Horizontal position (phase) control . . . . . . .
2.3.3
Horizontal size control . . . . . . . . . . . . . . . .
2.3.4
Vertical position control . . . . . . . . . . . . . . .
2.3.5
Vertical size control . . . . . . . . . . . . . . . . . .
2.3.6
Color 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.3.7
Color 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.3.8
Color 3 control . . . . . . . . . . . . . . . . . . . . . .
2.3.9
Color 3 (Green gain) control . . . . . . . . . . . .
2.3.10
Color 3 (Blue gain) control . . . . . . . . . . . . .
2.3.11
Color 3 (Red gain) control . . . . . . . . . . . . .
2.3.12
Rotation control . . . . . . . . . . . . . . . . . . . . .
2.3.13
PCC-Amp-Fine control . . . . . . . . . . . . . . . .
2.3.14
PCC-Amp control . . . . . . . . . . . . . . . . . . . .

2–1
2–1
2–1
2–2
2–4
2–4
2–5
2–5
2–5
2–5
2–5
2–5
2–6
2–6
2–6
2–6
2–6
2–6
2–6

iii

2.3.15
PCC-Phase control . . . . . . . . . . . . . . . . . . .
2.3.16
Key-Balance control . . . . . . . . . . . . . . . . . .
2.3.17
Pin-Balance control . . . . . . . . . . . . . . . . . .
2.4
Servicing the Monitor . . . . . . . . . . . . . . . . . . .
2.4.1
DECmailer . . . . . . . . . . . . . . . . . . . . . . . . .
2.4.2
Carry-In Service . . . . . . . . . . . . . . . . . . . . .
2.4.3
Monitor Disposal . . . . . . . . . . . . . . . . . . . .

2–7
2–7
2–7
2–7
2–8
2–8
2–8

3 Specifications
3.1
3.2
3.3
3.4

Monitor Specifications . . . . . . . . . . . . . . . . . . .
Scanning Modes . . . . . . . . . . . . . . . . . . . . . . . .
Monitor Power Management System . . . . . . . .
Environment . . . . . . . . . . . . . . . . . . . . . . . . . .

3–1
3–2
3–3
3–4

VRC21-Hx Color Monitor (Rear View) . . . .
VRC21-Hx Color Monitor (Front View) . . .
Adjustment Controls . . . . . . . . . . . . . . . . .

1–2
1–3
2–4

Figures
1–1
1–2
2–1

Tables
1
1–1
2–1
3–1

Recommendations for Proper Setup and
Use . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
User Controls and Functions . . . . . . . . . . .
Identifying and Correcting Problems . . . . .
Factory Pre-set Resolution and Frequencies
..................................

viii
1–3
2–2
3–2

About This Guide
Overview
The VRC21-Hx Color Display Monitor is a 21-inch intelligent,
microprocessor based monitor with multiscanning and digitalcontrolled color graphics. The monitor is compatible with most
red-green-blue (RGB) display standards and color video cards. The
digital-controlled multiscanning allows the monitor to operate with
precision regardless of its input power frequency.

008

G-0

The monitor is well-suited for windowing environments. Within the
its memory, you can store pre-programmed screen display standards,
as well as your selection of display colors from an unlimited palette.
The monitor also has a power management system, which a personal
computer can control to reduce the monitor’s output power levels
while not in use, thus saving energy. This power management system
exceeds the U.S. Environmental Protection Agency (EPA) Energy Star
requirements for saving energy.

Audience
This guide is intended for users who wish to install the color monitor.
This guide describes how to connect cables and clean the monitor.

Conventions
The following conventions are used in this document:
Convention

Meaning

Note

Provides general information.

Caution

Provides information to prevent damage to equipment.

Warning

Provides information to prevent injury.

Environment
Note
This product has been designed and manufactured to minimize
the impact to the environment. The packaging is recyclable
and the monitor can be returned for proper disposal.

Before You Start
A small flat-blade screwdriver may be needed to install the
communication cable.

Proper Setup and Use
Important Information
Certain recent scientific literature suggests that poor posture, work
habits, or office equipment setup may cause injuries. Other literature
suggests that there is no cause and effect. Because the safety of
our users is a great concern, it is important to take the precautions
described in Table 1.

vii

Table 1 Recommendations for Proper Setup and Use
Adjust

So that . . .

Chair

Feet are flat on the
floor or footrest if
needed.

Legs are vertical
forming a right
angle to the floor.

Your weight is off
your thighs and
are in a horizontal
position. Keep the
back of your knees
away from the
seat so you do not
compress the area
behind them, which
could restrict the
blood flow.

Your upper body is
erect and your
lower back is
supported with
a backrest.

Keyboard 5

Your wrists are
straight and do
not flex more than
15°. They may
be supported but
should not rest on
sharp edges.

MA–0069–93.IL

(continued on next page)

viii

Table 1 (Cont.) Recommendations for Proper Setup and Use
Adjust

So that . . .

Arms

Your upper arms are straight down at your sides, and
elbows are close to your sides and support your arm weight.
Forearms should be at a 70° to 90° angle.

Head

Your neck is not strained. Your head should incline
downward, but no more than 15° to 20°.

Monitor

Your eye level is at the correct distance for proper vision.

Eyes

You avoid eyes fatigue, which can be caused by glare, image
quality, uncomfortable furniture, eye height, and uncorrected
vision. If you cannot read the screen at different distances,
you may need special glasses. Relax your eyes periodically
by looking at distant objects.

Work
Breaks

You take periodic work breaks. Morning, lunch, and
afternoon breaks meet most recommendations. Take
advantage of work breaks to move around and do other
movements.

Lighting

You avoid direct lighting or sunlight on the screen, which
causes glare and reflections. This monitor screen has an
antiglare treatment to reduce glare. Place lighting behind
or to the side of your work area, and distribute the lighting
evenly on your work area. Adjust the brightness and the
contrast controls as needed.

Noise

You keep background noise at a minimum. Background
noise above 65 dBA is tiring. Sound-absorbing materials,
such as curtains, carpeting, and acoustic tile, can help
reduce background noise.

Temperature

The room is 20°C to 23 °C (68°F to 74°F)

Humidity

The air is 30% to 70% relative humidity.

Ventilation

There is adequate air ventilation for equipment operation
and to avoid fatigue.
(continued on next page)

Table 1 (Cont.) Recommendations for Proper Setup and Use
Adjust

So that . . .

Space
between
monitors

There is more than 70 cm (28 in) center to center, preferably
more than 152 cm (60 in).

Warning
If you experience pain or discomfort during use of the monitor,
then take a substantial break and review the instructions for
posture and work habits. If the pain or discomfort continues
after resuming use of the monitor, then discontinue use and
report the condition to your job supervisor or physician.

Installation/Operating Guidelines
Observe the following basic rules for installation and use.

Do . . .
•

Use the power cord supplied with the monitor, which is UL-, CSA-,
and VDE-approved.

•

Turn the monitor off when not being used for an extended period
of time.

Do Not . . .
•

Overload the ac outlet.

•

Open the monitor. It contains high voltages that could result in
personal injury. If any problems arise, call your service technician.

•

Move the monitor on a stand over carpet or thresholds.

•

Push objects into the monitor’s openings.

•

Add accessories that are not designed for this monitor.

•

Operate the monitor near water or in a damp environment, which
could cause an electrical shock hazard.

•

Operate the monitor near magnets, motor devices, transformers,
high power lines, or large steel pillars, which can cause distortion
in the picture and/or color purity.

•

Obstruct the ventilation openings in the monitor’s cabinet, such as
placing the monitor on a rug or within an enclosure.

•

Place the monitor near a radiator or heat source.

1
Installation
1.1 Monitor Installation
To connect your monitor:
1. Make sure the power to the monitor and the computer is off.
2. Position the monitor and the computer so that you can easily get
to the back panel of each system.
3. Connect the BNC connectors of the cable to the R G B inputs
on the back of the monitor.
4. Connect the other end of the cable to the High Resolution Graphic
Video Card or to the back of the personal computer. If needed,
refer to your computer owner’s manual.
5. If your cable has a separate sync signals, connect these BNC
connectors to their respective BNC receptacles (HD/COMP
and
VD ) on the back of the monitor. However, if sync on green is
available, do not connect the HD/COMP and VD BNC cables.

Installation 1–1

Installation
1.1 Monitor Installation
Figure 1–1 VRC21-Hx Color Monitor (Rear View)

DSG-000800

DIN-15P

is set at 75 . (The 1k position is
6. Ensure that the Sync switch
for TTL sync signals on DIN-15P, which is not supported.)

7. If desired, set the Power management switch
On. This switch
allows the monitor’s power supply to reduce its output when
given the correct signal from a PC that has a Power Management
feature.

8. Plug in the ac power cord to the monitor, then to a
properly-grounded ac electrical outlet.

1–2 Installation

Installation
1.2 Turn On Power to Monitor

1.2 Turn On Power to Monitor
Push the power switch button
indicator
should light.

to turn on the monitor. The power

Figure 1–2 VRC21-Hx Color Monitor (Front View)

1
DSG-000802

Table 1–1 User Controls and Functions
Item

Function
Power switch

Turns the monitor on and off

Power indicator

Lights when ac power is on.

Degaussing switch

Eliminates possible color impurity.

Contrast

Increases (+) or decreases (-) white level for
comfortable viewing.

Brightness

Adjusts black level for comfortable viewing
(continued on next page)

Installation 1–3

Installation
1.2 Turn On Power to Monitor
Table 1–1 (Cont.) User Controls and Functions
Item

Function
Status indicator

Lights when adjusting Contrast or
Brightness.
 Flashes when limits are reached.
 Flashes when sync signal is not connected.
 Blinks slowly when power management is
active.

Memory recall button

Restores factory default adjustments.

Adjustment function
select buttons

Selects the desired adjustment function.

Adjustment function
indicators

Identifies the selected function.

Adjustment controls
- and +

Decreases or increases the function
adjustment, which is automatically saved in
memory.

With any of the following
selected . . .

Pushing Memory Recall button
restores . . .

H-Position, H-Size,
V-Position, V-Size

Screen position and size

Color 3 gain

Color for all gains

Rotation control and both
+ and - adjustments at
the same time

Rotational adjustment

1–4 Installation

2
Servicing
2.1 Cleaning the Monitor
To clean the monitor:
1. Unplug the monitor.
2. Clean the monitor with a soft, slightly damp cloth. Do not use an
aerosol cleaner directly on the screen.
Caution
Do not use benzene, thinner, or any volatile substance to
clean the monitor, as these product may discolor the monitor’s
cabinet. Likewise, do not place rubber or vinyl on the monitor.

2.2 Maintenance and Troubleshooting
2.2.1 Identifying and Correcting Problems
The following can be sources of problems:
•

Communications cables

•

Host system

•

Nearby power or electrical sources

Servicing 2–1

Servicing
2.2 Maintenance and Troubleshooting

2.2.2 Troubleshooting Table
Use Table 2–1 to identify and correct any problem areas.
Table 2–1 Identifying and Correcting Problems
Symptom

Possible Cause

Suggested Solution

The Power Management Turn it OFF.
feature is active
on monitor but not
supported on host.

Display is too dim or
too bright.

Brightness or Contrast
control not set
correctly.

Adjust the brightness and
contrast control setting.

Background raster is
too bright and cannot
be adjusted.

Synchronization
signals may be present
on both the green cable
and the horizontal and
vertical sync cables.

Disconnect the horizontal
and vertical sync cables
(HD/COMP and VD) from
the back of the monitor.

Buzzing sound when
monitor is turned on
lasting less than 5 s.

The auto degaussing
circuit is active.

This is normal.

Video is off center.

The Earth’s magnetic
field at your location
may be causing the
display to shift.

Use the function controls
under the front panel to
adjust your screen to to
eliminate the distortion.
See Section 2.3.

Video display has
moving dots and
distorted lines. The
display rolls or flickers.

There is electromagnetic interference.

Move any electromechanical device, such as a fan
or a motor, away from
the monitor or move the
monitor.

Servicing 2–3

Servicing
2.3 Adjustment Mode

2.3 Adjustment Mode
Monitors are sensitive to magnetic influences in the environment.
The adjustment mode lets you change several aspects of the monitor
to stabilize the video image in your area.

2.3.1 Adjustment Codes

1. Press the select buttons ( ) to choose one of the controls
indicated in Figure 2–1. The selections cycle through the controls
in the same sequence listed in the table.
Figure 2–1 Adjustment Controls1
Select
Recall

Function

Adjust
Degauss

H Position
H Size
V Position
V Size
Color 1 (9300o K)
Color 2 (6500o K) *
Color 3 *
Color 3 (Green gain)
Color 3 (Blue gain)
Color 3 (Red gain)
Rotation
PCC−Amp−Fine
PCC−Amp
PCC−Phase
Key−Balance
Pin−Balance
On

Off

Blink

MA−0340−93.GRA

2. When the indicator above the function symbol lights up, the
control is active and can be adjusted. Press the - or + buttons
to decrease or increase the adjustment. The monitor automatically
memorizes all adjustments.
1

*When on Color 1, press the - or + buttons to obtain Color 2 and Color 3.

2–4 Servicing

Servicing
2.3 Adjustment Mode

2.3.2 Horizontal position (phase) control
Moves the horizontal position to the left (-) or
right (+).

2.3.3 Horizontal size control
Narrows (-) or widens (+) the image.

2.3.4 Vertical position control
Moves the image down (-) or up (+).

2.3.5 Vertical size control
Shrinks (-) or expands (+) the height of the image.

2.3.6 Color 1
Factory preset to 9300°K white temperature.

2.3.7 Color 2
Factory preset to 6500°K white temperature.

Servicing 2–5

Servicing
2.3 Adjustment Mode

2.3.8 Color 3 control
Adjusts the white color balance. Default: 9300°K.

2.3.9 Color 3 (Green gain) control
Decreases (-) or increases (+) the green color gain.

2.3.10 Color 3 (Blue gain) control
Decreases (-) or increases (+) the blue color gain.

2.3.11 Color 3 (Red gain) control
Decreases (-) or increases (+) the red color gain.

2.3.12 Rotation control
Rotates the image counterclockwise (-) or clockwise
(+).

2.3.13 PCC-Amp-Fine control
Narrows (-) or widens (+) the center of the image on
the screen.

2.3.14 PCC-Amp control
Corrects a bowed image by narrowing (-) or
widening (+) the left and right edges.

2–6 Servicing

Servicing
2.3 Adjustment Mode

2.3.15 PCC-Phase control
Corrects a trapezoid image by narrowing (-) the top
or bottom (+) of the image.

2.3.16 Key-Balance control
Corrects a slanted image by moving the top of the
image left (-) or right (+).

2.3.17 Pin-Balance control
Corrects a distorted image by moving the center of
the image left (-) or right (+).

2.4 Servicing the Monitor
Warning
Do not attempt to service the monitor yourself. It
contains hazardous high voltages. Call a qualified service
representative.

Digital provides a wide range of maintenance programs for monitors.
It is recommended that you use either DECmailer or Carry-In Service
when servicing the VRC21-Hx color monitor. If needed, use the
original box and packing material to send the unit to the service
location. Contact your local Digital Services office.

Servicing 2–7

Servicing
2.4 Servicing the Monitor

2.4.1 DECmailer
DECmailer provides a mail-in service for the VRC21-Hx color monitor.
Ship the monitor to your nearest Digital Servicenter using a common
carrier. The monitor will be repaired or exchanged and returned to
you.

2.4.2 Carry-In Service
Digital Carry-In Servicenters are located in major cities around the
world. They offer convenient, cost-effective repair service with a
48-hour turnaround time.

2.4.3 Monitor Disposal
Warning
If you need to dispose of a unit, ask a qualified service
representative for the proper procedure. Improper disposal
could result in personal injury from implosion.

2–8 Servicing

3
Specifications
3.1 Monitor Specifications
Monitor

53.4 cm (21 in) non-glare, non-static 90° deflection,
0.31 mm stripe pitch

Dimensions

49.4

49.3

Display size

380

285 mm; 4:3 ratio

356

285 mm; 5:4 ratio

54.3 cm

Color

1=9300°K, 2=6550°K, 3=9300°K

Swivel

±45°

Tilt

-5° to +10°

Weight

36 Kg (79.5 lb)

Video Signal
Connectors
Power input

0.7V p-p RGB, with sync on green, composite, or
separate H- and V-sync.
BNC; 15-pin D-sub (not supported, do not use)
Autoranging: 100 - 120 Vac, 1.5 A; 220 - 240 Vac,
0.7 A; 50 Hz or 60 Hz

Environment:
Operating Temperature

5 - 40°C

Humidity

10 - 95% relative humidity (noncondensing)

Specifications 3–1

Specifications
3.2 Scanning Modes

3.2 Scanning Modes
To minimize adjustment needs, the monitor has 12 factory pre-set
display standards, shown in Table 3–1. When the monitor detects any
of these display standards, it automatically adjusts the picture size
and centering.
Table 3–1 Factory Pre-set Resolution and Frequencies
Pre-set Addressability

Vertical

Horizontal

640 x 480 (VGA)

59.94

31.47

640 x 480 (ERGO VGA)

72.79

37.86

720 x 400

70.08‡

31.47‡

800 x 600 (ERGO SVGA)

72.19†

48.08†

1152 x 900

76.15

71.81

1024 x 768

72.00

57.38

1024 x 864

60.00

54.05

1280 x 1024

60.10

64.98

1280 x 1024

66.47

70.66

1280 x 1024

72.56

77.17

1152 x 900

66.00

61.85

1280 x 512 (Stereo)

139.32

76.76

Using the monitor’s controls, you may store up to 10 additional display
standards. They must differ from any existing display standards by at least
2kHz horizontal scan frequency or 10 Hz vertical scan frequency, or the sync
signal polarities must be different. One of these is set as:
800 x 600 (SVGA)

60.32†

37.88†

Note: If you erase/modify these values, Memory Recall does not restore them.
non-interlaced
†positive polarities
‡Negative H Sync; positive V Sync

3–2 Specifications

Specifications
3.3 Monitor Power Management System

3.3 Monitor Power Management System
This monitor has three power-saving states, indicated by the
light-emitting diode (LED) on the front panel:

Screen

Green LED

State

Power
Consumption†

Recovery Time

Off (On if
sync signal
is missing)

Not used

150 w (max)

Off

Blinks
slowly

Standby/
Suspend

< 30 watts

Off

< 5 watts

15 s after the
monitor is
switched off then
on again.

† These power-saving states exceed the Environmental Protection Agency (EPA)
Energy Star requirements using the Video Electronics Standard Association (VESA)
methodology for Display Power Management Signals.

Notes
1. For proper operation of this Monitor Power Management
System, make sure that the monitor signal cable is
connected to the host system and that the host system is
On.
2. The power to the monitor may be On, indicated by the
power switch being recessed, even when the LED is Off.
When not in use for extended periods, turn the monitor
Off. This reduces the power consumption to a minimum.

Specifications 3–3

Specifications
3.4 Environment

3.4 Environment
This product has been designed and manufactured to minimize the
impact to the environment. The packaging is recyclable and the
monitor can be returned for proper disposal.
Acoustic Levels
Preliminary declared values per ISO 9296 and ISO 7779:
Sound Power Level1

Sound Pressure Level2
L   , dBA

L  , B
Product

Idle

Operate

Idle

Operate

VRC21-Hx

<4.0

<35

1 1 B = 10 dBA.
2 Operator position.

Asbestos
This product does not use asbestos in any form.
Flame Retardants
The enclosures do not contain polybrominated diphenylether (PBDE)
as a flame retardant additive; therefore, they do not emit toxic
dibenzofuran and dibenzodixion gases.
Ozone Depleting Substances (ODS)
The VRC21-Hx is in full compliance with the labeling requirements in
the U.S. Clean Air Act Amendments of 1990. It does not contain, nor
is it manufactured with, a Class 1 ODS, as defined in Title VI Section
611 of this act.
PVC
The plastic enclosures are not made of rigid PVC. The material has a
non-halogenated, flame-retardant system and is cadmium free.

3–4 Specifications

Specifications
3.4 Environment
Recyclable Material
The packaging material can be recycled, or you can save it to return
the monitor to a service center for repair or disposal.
VCCI Class 2

DSG-000324

Specifications 3–5