Digital Equipment VR319 User manual

VR319MonitorServiceGuide
Order Number EK-VR319-SV-001
Digital Equipment Corporation

1st Edition, May 1990
The information in this document is subject to change without notice and should not
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Corporation assumes no responsibility for any errors that may appear in this document.
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Copyright © Digital Equipment Corporation 1990
All Rights Reserved.
Printed in U.S.A.
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This document was prepared and published by Educational Services Development and
Publishing, Digital Equipment Corporation.

Contents
About This Manual vii
1 Overview
1.1 Product Description ................................ 1–1
1.1.1 Refresh Rate . . . ................................ 1–2
1.1.2 Model Variations ................................ 1–2
1.2 Tools and Equipment ............................... 1–2
1.3 Recommended Spares List . . . ........................ 1–3
2 Troubleshooting
2.1 Before You Start. . . ................................ 2–1
2.2 Troubleshooting Procedures . . ........................ 2–2
2.3 Troubleshooting Tables.............................. 2–2
3 Removing and Replacing FRUs
3.1 Procedures ....................................... 3–1
3.1.1 Rear Cover Removal ............................. 3–2
3.1.2 Top Cover Removal .............................. 3–6
3.2 Field Replaceable Units (FRUs)....................... 3–8
3.2.1 Interconnect Cable ............................... 3–9
3.2.2 Deflection Module ............................... 3–10
3.2.3 Video Casting Assembly . . . ........................ 3–15
3.2.4 CRT Discharge . . ................................ 3–19
3.2.5 Power Supply Module ............................ 3–21
3.2.6 CRT/Chassis Assembly............................ 3–25
3.3 CRT Disposal (Trained Service Personnel Only) . . . ....... 3–25
iii

iv Contents
4 Aligning the Video Monitor
4.1 Introduction ...................................... 4–1
4.1.1 Before You Start. ................................ 4–1
4.1.2 Displaying Screen Tests . . . ........................ 4–2
4.2 Monitor Adjustments ............................... 4–3
4.3 Height Adjustments ................................ 4–6
4.3.1 Vertical Centering (VCEN) and Vertical Linearity (VLIN) 4–6
4.3.2 Vertical Height (HEIGHT) . ........................ 4–8
4.4 Width Adjustments ................................ 4–9
4.4.1 Horizontal Phase, Horizontal Linearity, and Horizontal
Centering (HPHASE, HLIN, HCEN) . . ............... 4–9
4.4.2 Horizontal Width (WIDTH) ........................ 4–12
4.5 Vertical Hold Adjustment (VHOLD) .................... 4–13
4.6 Bias Adjustment (G2 ) .............................. 4–15
4.7 Using the Radiance Meter . . . ........................ 4–16
4.8 Gain Adjustment (GGAIN) . . . ........................ 4–18
4.9 Focus Adjustments (G4) ............................. 4–19
4.9.1 Vertical Dynamic Focus (VPARAB) . . . ............... 4–21
4.9.2 Horizontal Dynamic Focus (HPARAB) . ............... 4–21
5 Changing the Refresh Rate
5.1 VR319 Monitor Refresh Rates ........................ 5–1
5.2 Changing the Refresh Rate . . ........................ 5–1
5.2.1 Adjusting the Monitor for a New Refresh Rate . . ....... 5–2
5.3 Product Conversion Label . . . ........................ 5–2
A Alignment Screens
A.1 Circle-Crosshatch Pattern . . . ........................ A–1
A.2 All-White Pattern. . ................................ A–2

Contents v
B VR319 Documentation
Index
Figures
1–1 VR319 Monochrome Monitor . ........................ 1–1
3–1 Power Switch/Indicator ............................. 3–2
3–2 Removing the Power Cord . . . ........................ 3–3
3–3 Sample Signal Cable ............................... 3–4
3–4 Removing the Rear Cover . . . ........................ 3–5
3–5 Tilting the Top Cover ............................... 3–6
3–6 Removing the Top Cover ............................ 3–7
3–7 VR319 Field Replaceable Units ....................... 3–8
3–8 Removing the Interconnect Cable ..................... 3–9
3–9 Removing the 2-wire, 3-pin Cable ..................... 3–11
3–10 Disconnecting Cables from the Deflection Module . . ....... 3–12
3–11 Removing the Deflection Module ...................... 3–13
3–12 Refresh Rate Jumper on Deflection Module .............. 3–14
3–13 Disconnecting the Interconnect Cable . . . ............... 3–15
3–14 Disconnecting the Brightness/Contrast Cable ............ 3–16
3–15 Removing the CRT Socket Connector ................... 3–17
3–16 Removing the Video Casting . ........................ 3–18
3–17 Discharging the CRT and Removing the Anode Cap ....... 3–20
3–18 Disconnecting the Interconnect Cable . . . ............... 3–21
3–19 Removing the LED Cable from the Power Supply . . ....... 3–22
3–20 Removing the Power Supply . ........................ 3–23
3–21 Refresh Rate Jumper on the Power Supply .............. 3–24
3–22 CRT Disposal Procedure ............................ 3–28
4–1 User Controls ..................................... 4–3
4–2 Adjustment Locations .............................. 4–4
4–3 Using the Metric Measuring Tape ..................... 4–5
4–4 Circle-Crosshatch Pattern . . . ........................ 4–6
4–5 VCEN, VHOLD, HEIGHT, and VLIN Controls ........... 4–7
4–6 Height Control .................................... 4–8
4–7 Circle-Crosshatch Pattern . . . ........................ 4–9

vi Contents
4–8 Width Controls .................................... 4–10
4–9 Measuring the Width of the Viewing Area ............... 4–12
4–10 VHOLD Control . . . ................................ 4–14
4–11 Bias Adjustment (G2)............................... 4–15
4–12 Radiance Meter . . . ................................ 4–16
4–13 Using the Radiance Meter . . . ........................ 4–17
4–14 Gain Adjustment . . ................................ 4–18
4–15 Circle-Crosshatch Pattern . . . ........................ 4–19
4–16 Focus Control (G4) . ................................ 4–20
5–1 Product Conversion Label . . . ........................ 5–3
A–1 Circle-Crosshatch Pattern . . . ........................ A–1
A–2 All-White Pattern. . ................................ A–2
Tables
1–1 Refresh Rates of Monitor Models ...................... 1–2
1–2 Tools and Equipment ............................... 1–2
1–3 VR319 Recommended Spares . ........................ 1–3
2–1 Blank Screen, No Video or Raster ..................... 2–3
2–2 Blank Screen, No Video but Raster Present .............. 2–4
2–3 Poor Display Quality ............................... 2–5
5–1 Monitor Model Refresh Rates . ........................ 5–1
5–2 Completing the Product Conversion Label ............... 5–2

AboutThisManual
This manual describes how to service your VR319 monitor.
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 describes the troubleshooting procedures.
• Chapter 3 describes how to remove and replace 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 manual 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.
PN Part number.
vii

1
Overview
1.1 Product Description
The VR319 monochrome monitor (Figure 1–1) has a direct viewed, 500
mm, antiglare CRT. 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 that the host system sends to it.
MA-0243-90.DG
Figure 1–1 VR319 Monochrome Monitor
1–1

1–2 Overview
1.1.1 Refresh Rate
The monitor operates at either a 66 Hz or 72 Hz refresh rate. The refresh
rate 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
jumpers on the deflection module and power supply module to match the
new system. Refer to Chapter 5.
1.1.2 Model Variations
Table 1–1 lists the different VR319 models and their refresh rates.
Table 1–1 Refresh Rates of Monitor Models
Model Pixels x Lines Refresh Rate Applicable Area
VR319-CA 1280 x 1024 66 Hz Northern Hemisphere
VR319-C4 1280 x 1024 66 Hz Southern Hemisphere
VR319-DA 1280 x 1024 72 Hz Northern Hemisphere
VR319-D4 1280 x 1024 72 Hz Southern Hemisphere
1.2 Tools and Equipment
You need the following tools and equipment to service the VR319
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 Spares List
The following are the recommended spares for the VR319 monitor:
Table 1–3 VR319 Recommended Spares
Spares Part Number
Power supply module 54-19703-00
Deflection module 54-19303-01
Video casting assembly 70-27010-02
Interconnect cable 70-27000-01
CRT/Chassis assembly
(Northern Hemisphere) 70-27429-07
CRT/Chassis assembly
(Southern Hemisphere) 70-27429-08

2
Troubleshooting
This chapter describes how to troubleshoot a VR319 monitor problem
through fault isolation.
2.1 Before You Start
WARNING
If you smell burning components, turn power to the monitor off
and disconnect the power cord.
The following information will help you troubleshoot the monitor easily
and effectively:
• 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.
2–1

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 VR319 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 possible causes in order of probability.
This troubleshooting information applies to three types of video problems
that the VR319 monitor may exhibit:
• A blank screen, without video or raster (Table 2–1)
• A blank screen, without video, but raster present (Table 2–2)
• Poor display quality (Table 2–3)
Use the troubleshooting tables as follows:
1. Note the 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.

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 the
power indicator LED
is off.
Power cord is not
connected to the
power source or
monitor.
CRT protection
circuit has turned
monitor off.
Connect the power cord to the
power source or monitor.
Push the on/off switch off;
then set it to the on position.
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 3.2.5).
Deflection module
is faulty. Replace the deflection module (Section 3.2.2).
Both the power
indicator LED and
the deflection module
LED are on.
Contrast or
brightness is set
too low.
Adjust the contrast and
brightness controls.
Internal cabling is
loose or faulty. Check all cabling going to the deflection module and the
video casting assembly. If
necessary, secure the cables.
G2 Bias is set too
low. Adjust the G2 Bias (Section 4.6).
Deflection module
is faulty. Replace the deflection module (Section 3.2.2).
The power indicator
LED is on; the
deflection module
LED is off.
Deflection module
is faulty. Replace the deflection module (Section 3.2.2).
Video casting
assembly is faulty.
CRT/chassis
assembly is faulty.
Replace the video casting
assembly (Section 3.2.3).
Replace the CRT/chassis
assembly (Section 3.2.6)
only after trying the previous
solutions.

2–4 Troubleshooting
Table 2–2 Blank Screen, No Video but Raster Present
Symptom Possible Cause Suggested Solution
Raster can be
displayed by
adjusting the
brightness control,
but no video or
cursor can be seen
even when the
contrast control is
at maximum.
Host system’s CRT
screen saver feature
is activated.
Power to the host
system is off.
External signal
cable is disconnected.
Press any key to reactivate the
display.
Turn power to the host system
on.
Connect the signal cable to
the monitor and host.
Internal cabling is
loose or faulty. Check all cabling to the deflection module and the
video casting assembly.
The host system
is not supplying
video signals to the
monitor.
Connect the monitor to a
known working host system (if
available) to verify the problem
before replacing any monitor
module or cable.
Video casting
assembly is faulty. Replace the video casting assembly (Section 3.2.3).
Deflection module is
faulty. Replace the deflection module (Section 3.2.2).
Faulty CRT/chassis
assembly Replace the CRT/chassis assembly (Section 3.2.6)
only after trying the previous
solutions.

Troubleshooting 2–5
NOTE
Make sure the monitor has warmed up for at least 20 minutes
before you use Table 2–3.
Table 2–3 Poor Display Quality
Symptom Possible Cause Suggested Solution
Poor geometry,
centering, and/or
linearity.
Centering controls on
top of the monitor are
out of adjustment.
See section 4.1.
Local magnetic fields. Remove any electro-
mechanical devices from
the vicinity of the monitor, or
move the monitor to another
location.
Monitor is out of
adjustment. Align the video monitor. Refer to Chapter 4.
Display is not
centered on screen. Adjustment is incorrect. Perform the horizontal center adjustment (Section 4.4.1).
Perform the horizontal phase
adjustment (Section 4.4.1).
Perform the vertical center
adjustment (Section 4.4.1).
Deflection module is
faulty. Replace the deflection module (Section 3.2.2).
Display is too short. Adjustment is
incorrect. Perform the height adjustment (Section 4.3.2).
Deflection module is
faulty. Replace the deflection module (Section 3.2.2).
Display is too tall. Adjustment is
incorrect. Perform the height adjustment (Section 4.3.2).
Deflection module is
faulty. Replace the deflection module (Section 3.2.2).
Display is too wide. Adjustment is
incorrect. Perform the width adjustment (Section 4.4.2).
Deflection module is
faulty. Replace the deflection module (Section 3.2.2).
Display is too
narrow. Adjustment is incorrect. Perform the width adjustment (Section 4.4.2).

2–6 Troubleshooting
Table 2–3 (Cont.) Poor Display Quality
Symptom Possible Cause Suggested Solution
Deflection module is
faulty. Replace the deflection module (Section 3.2.2).
Power supply module
is faulty. Replace the power supply module (Section 3.2.5).
Poor light output
(using the all-white
diagnostic pattern),
or display is not
bright enough.
Brightness or contrast
controls are set too
low.
Adjust the brightness and
contrast controls.
Host system is not
supplying correct
signal levels.
Repair the host system.
G2 and GAIN
adjustments may
be incorrect.
Perform the G2 adjustment
(Section 4.6) and GAIN
adjustment (Section 4.8).
Video casting
assembly is faulty. Replace the video casting assembly (Section 3.2.3).
Deflection module is
faulty. Replace the deflection module (Section 3.2.2).
CRT wearout. Replace the CRT/chassis
assembly (Section 3.2.6) only
after trying the previous
solutions.
Display is too bright. Brightness control is
set to high. Adjust the brightness control to the optimum range.
G2 adjustment may be
incorrect. Perform the G2 adjustment (Section 4.6).
Video casting
assembly is faulty. Replace the video casting assembly (Section 3.2.3).
Deflection module is
faulty. Replace the deflection module (Section 3.2.2).
Vertical lines are not
straight. Local magnetic fields are present. Remove any electro- mechanical devices from
the vicinity of the monitor, or
move the monitor.

Troubleshooting 2–7
Table 2–3 (Cont.) Poor Display Quality
Symptom Possible Cause Suggested Solution
Deflection module is
faulty. Replace the deflection module (Section 3.2.2).
Faulty CRT/chassis
assembly Replace the CRT/chassis assembly (Section 3.2.6) only
after trying the previous
solutions.
Linearity is
incorrect. Adjustment is incorrect. Perform the vertical and horizontal linearity
adjustments (Section 4.3.1
and Section 4.4.1).
Deflection module is
faulty. Replace the deflection module (Section 3.2.2).
CRT/chassis assembly
is faulty. Replace the CRT/chassis assembly (Section 3.2.6) after
trying the previous solutions.
Video noise Signal cable is faulty. Replace the signal cable.
Video casting
assembly is faulty. Replace the video casting assembly (Section 3.2.3).
Deflection module is
faulty. Replace the deflection module (Section 3.2.2).
Power supply module
is faulty. Replace the power supply module (Section 3.2.5).
Host system is faulty. Repair the host system.
Focus is not sharp. Adjustment is
incorrect. Perform the focus adjustment (Section 4.9).
Deflection module is
faulty. Replace the deflection module (Section 3.2.2).
Video casting
assembly is faulty. Replace the video casting assembly (Section 3.2.3).
CRT/chassis assembly
is faulty. Replace the CRT/chassis assembly (Section 3.2.6) after
trying the previous solutions.

3
RemovingandReplacingFRUs
This chapter describes how to remove and replace the VR319 monitor field
replaceable units (FRUs).
3.1 Procedures
WARNING
Turn power to the monitor off and remove the power cord before
disconnecting or replacing any FRU.
Perform all the removal and replacement procedures from the rear of the
monitor. Tilt the monitor from the back to the front to allow easier access
to the modules.
NOTE
If you twist the monitor while applying the tilt pressure, the
monitor moves easily.
The procedures only 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.
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).
MA-1239-89.DG
Power
Switch/
Indicator
Figure 3–1 Power Switch/Indicator

Removing and Replacing FRUs 3–3
2. Unplug the power cord from the wall outlet first, then from the
monitor (Figure 3–2).
MA-1223-89.DG
Power Cord
Power Source
From Host System
Figure 3–2 Removing the Power Cord