DEC VR315 User manual

VR315andVR325MonochromeMonitors
ServiceGuide
Order Number EK-VR315-SV-002
Digital Equipment Corporation

Second Edition, February 1991
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Contents
About This Manual vii
1 Overview
1.1 Product Description ................................ 1–1
1.1.1 Model Variations ................................ 1–2
1.2 Tools and Equipment ............................... 1–2
1.3 Recommended Spare Parts 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 Introduction ...................................... 3–1
3.1.1 Removing the External Cables ...................... 3–2
3.1.2 Removing the Rear Cover . ........................ 3–3
3.1.3 Removing the Top Cover . . ........................ 3–4
3.2 Field Replaceable Units (FRUs)....................... 3–5
3.2.1 Interconnect Cable ............................... 3–6
3.2.2 Power Supply Module ............................ 3–8
3.2.3 Discharging the CRT and Removing the Anode Cap ..... 3–10
3.2.4 Deflection Module ............................... 3–12
3.2.5 Video Casting Assembly . . . ........................ 3–16
3.2.6 CRT/Chassis Assembly............................ 3–20
3.3 CRT Disposal (Trained Service Personnel Only) . . . ....... 3–21
3.4 Tilt-Swivel Base . . ................................ 3–24
iii

iv Contents
4 Aligning the Video Monitor
4.1 Introduction ...................................... 4–1
4.1.1 Before You Start. ................................ 4–1
4.1.2 Check LEDs and Heater Filament................... 4–4
4.1.3 Displaying Screen Tests . . . ........................ 4–4
4.2 Monitor Adjustments ............................... 4–5
4.3 Deflection Adjustments ............................. 4–6
4.3.1 Raster Adjustment ............................... 4–6
4.3.2 Anode Voltage Adjustment . ........................ 4–6
4.3.3 Height and Width Adjustments ..................... 4–6
4.4 Using the Radiance Meter . . . ........................ 4–8
4.5 Cutoff Adjustment . ................................ 4–10
4.6 GAIN Adjustment . ................................ 4–11
A VR315 and VR325 Documentation
Figures
1–1 Monochrome Monitor ............................... 1–1
3–1 Removing Cables from the Monitor .................... 3–2
3–2 Rear Cover Removal ............................... 3–3
3–3 Top Cover Removal ................................ 3–4
3–4 Field Replaceable Units ............................. 3–5
3–5 Disconnecting the Interconnect Cable . . . ............... 3–7
3–6 Removing the On/Off Switch Cable from the Power Supply . . 3–8
3–7 Removing the Power Supply . ........................ 3–9
3–8 Discharging the CRT and Removing the Anode Cap ....... 3–11
3–9 Loosening the Captive Screw . ........................ 3–13
3–10 Disconnecting Cables from the Deflection Module . . ....... 3–14
3–11 Removing the Deflection Module ...................... 3–15
3–12 Removing Cables from the Video Casting ............... 3–17
3–13 Removing the CRT Socket Connector ................... 3–18
3–14 Removing the Video Casting . ........................ 3–19
3–15 Crushing the Evacuation Point ....................... 3–23
3–16 Tilt-Swivel Base . . ................................ 3–25
4–1 User Controls and Indicator . . ........................ 4–3

Contents v
4–2 Circle-Crosshatch Pattern . . . ........................ 4–4
4–3 Using the Metric Measuring Tape ..................... 4–5
4–4 Internal Controls . . ................................ 4–7
4–5 Radiance Meter . . . ................................ 4–9
4–6 Using the Radiance Meter . . . ........................ 4–10
4–7 GAIN, G2, and FOCUS (G4) Adjustments .............. 4–11
Tables
1–1 Tools and Equipment ............................... 1–2
1–2 Recommended Spare Parts. . . ........................ 1–3
2–1 Blank Screen, No Video or Raster ..................... 2–3
2–2 Blank Screen, No Video, but Raster is Present ........... 2–5
2–3 Poor Display Quality ............................... 2–6
4–1 Monitor Controls and Indicators ...................... 4–2

AboutThisManual
VR315 and VR325 Video Monitors
This guide describes how to service the VR315 and VR325 monochrome
monitors in the field.
Manual Organization
This manual is organized as follows:
• Chapter 1 provides a general overview of the product and includes a
list of spare parts.
• Chapter 2 describes the troubleshooting procedures.
• Chapter 3 provides the removing and replacing procedures for the
Field Replaceable Units (FRUs).
• Chapter 4 describes the alignment procedures.
• Appendix A describes related documentation.
Conventions
Convention Meaning
Caution Provides information to prevent damage to the equipment.
Warning Provides information that relates to personal safety.
Note Provides general information.
PN Refers to a part number.
! This type of number in text refers to an item in an illustration.
monitor Refers to the VR315 and VR325 monochrome monitors.
vii

1
Overview
1.1 Product Description
The monochrome monitor (Figure 1–1) has a direct viewed antiglare
screen with an auto-ranging power supply for worldwide operation. Its
built-in tilt-swivel base lets the user adjust the screen for viewing comfort.
When connected to a host system, the monitor displays information sent
by the host.
MA-0299-90.DG
Figure 1–1 Monochrome Monitor
1–1

1–2 Overview
1.1.1 Model Variations
The monitor is available in the following models:
Model Applicable Area
VR315-DA Northern hemisphere
VR315-D4 Southern hemisphere
VR325-DA Northern hemisphere
VR325-D4 Southern hemisphere
1.2 Tools and Equipment
Table 1–1 lists the tools and equipment you will need to service the
monitor:
Table 1–1 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