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Summary of Contents for DEC VR315
- Page 1 VR315 and VR325 Monochrome Monitors Service Guide Order Number EK-VR315-SV-002 Digital Equipment Corporation...
- Page 2 ( c ) ( 1 ) ( ii ) of the Rights in Technical Data and Computer Software clause at DFARS 252.227–7013. Copyright © Digital Equipment Corporation 1991 All Rights Reserved. Printed in U.S.A. The following are trademarks of Digital Equipment Corporation: DIBOL UNIBUS DEC/CMS EduSystem DEC/MMS VAXcluster DECnet MASSBUS DECsystem–10 DECSYSTEM–20...
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Page 3: Table Of Contents
Contents About This Manual Overview Product Description ....... . 1–1 1.1.1 Model Variations . - Page 4 GAIN Adjustment ....... . . 4–11 VR315 and VR325 Documentation Figures 1–1...
- Page 5 Contents v 4–2 Circle-Crosshatch Pattern ......4–4 4–3 Using the Metric Measuring Tape ..... 4–5 4–4 Internal Controls .
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Page 7: About This Manual
About This Manual 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. -
Page 9: Overview
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. -
Page 10: Model Variations
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... -
Page 11: Recommended Spare Parts List
Overview 1–3 1.3 Recommended Spare Parts List Table 1–2 lists the recommended spare parts for the monitor. Table 1–2 Recommended Spare Parts VR315 Part VR325 Part Spare Part Number Number Power supply 54-19629-02 54-19629-03 Deflection module 54-19826-01 54-19826-02 Video casting assembly... -
Page 13: Troubleshooting
Troubleshooting This chapter describes how to troubleshoot a monitor problem through fault isolation. 2.1 Before You Start The following information will help you troubleshoot the monitor easily and effectively: WARNING If you smell burning components, press the monitor power switch off and disconnect the power cord. -
Page 14: Troubleshooting Procedures
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 monitor as follows: 1. -
Page 15: Blank Screen, No Video Or Raster
Troubleshooting 2–3 Table 2–1 Blank Screen, No Video or Raster Symptom Possible Cause Suggested Solution Blank screen, no video The power cord is Connect the power cord to the or raster. Power to not connected to power source or monitor. the monitor is on (the the power source or power switch is in) but... - Page 16 2–4 Troubleshooting Table 2–1 (Cont.) Blank Screen, No Video or Raster Symptom Possible Cause Suggested Solution Deflection module Replace the deflection module is faulty. (Section 3.2.4). Video casting Replace the video casting assembly is faulty. assembly (Section 3.2.5). CRT/chassis Replace the CRT/chassis assembly is faulty.
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Page 17: Blank Screen, No Video, But Raster Is Present
Troubleshooting 2–5 Table 2–2 Blank Screen, No Video, but Raster is Present Symptom Possible Cause Suggested Solution Raster can be The Host system Press any key to reactivate the displayed by CRT screen saver display. adjusting the feature is activated. brightness control, but no video or cursor can be seen... -
Page 18: Poor Display Quality
2–6 Troubleshooting 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, Controls on top of the See section 4.1. centering, height, monitor are out of width, and/or... - Page 19 Troubleshooting 2–7 Table 2–3 (Cont.) Poor Display Quality Symptom Possible Cause Suggested Solution CRT is worn out. Replace the CRT/chassis assembly (Section 3.2.6) only after trying the previous solutions. Display is too bright. Brightness control is Set the brightness control to set incorrectly.
- Page 20 2–8 Troubleshooting Table 2–3 (Cont.) Poor Display Quality Symptom Possible Cause Suggested Solution Video casting Replace the video casting assembly is faulty. assembly (Section 3.2.5). CRT/chassis assembly Replace the CRT/chassis is faulty. assembly (Section 3.2.6) only after trying the previous solutions.
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Page 21: Removing And Replacing Frus
Removing and Replacing FRUs 3.1 Introduction This chapter describes how to remove and replace the monitor field replaceable units (FRUs). The monitor consists of a small number of removable FRUs that are easily accessed and removed from the rear of the monitor. No special tools are needed, and self-retaining hardware is used. -
Page 22: Removing Cables From The Monitor
3–2 Removing and Replacing FRUs 3.1.1 Removing the 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 power source (wall outlet or host system) first, then from the monitor. -
Page 23: Removing The Rear Cover
Removing and Replacing FRUs 3–3 3.1.2 Removing the Rear 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. -
Page 24: Removing The Top Cover
3–4 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). T o p C o v e r M A - 0 2 2 7 - 9 0 . -
Page 25: Field Replaceable Units (Frus)
Removing and Replacing FRUs 3–5 3.2 Field Replaceable Units (FRUs) The monitor FRUs are shown in Figure 3–4. When replacing any FRU, tilt the monitor from the back to the front to allow easier access to the modules. WARNING Turn the power off before disconnecting or replacing any FRU. CRT Chassis Assembly Deflection... -
Page 26: Interconnect Cable
3–6 Removing and Replacing FRUs 3.2.1 Interconnect Cable Remove the interconnect cable as follows: 1. Remove the rear cover (Section 3.1.2). 2. Remove the top cover (Section 3.1.3). 3. Disconnect the interconnect cable in the following order (Figure 3–5). Connector Interconnect Cable Plug Power supply (right) Video casting (center) -
Page 27: Disconnecting The Interconnect Cable
Removing and Replacing FRUs 3–7 CAUTION When replacing the interconnect cable, verify that the pull tab (labeled P2) is above the cable connector on the deflection module. You can damage the monitor if this cable is replaced incorrectly. I n t e r c o n n e c t C a b l e M A - 0 2 2 9 - 9 0 . -
Page 28: Power Supply Module
3–8 Removing and Replacing FRUs 3.2.2 Power Supply Module Remove the power supply module as follows: 1. Remove the rear cover (Section 3.1.2). 2. Remove the top cover (Section 3.1.3). 3. Remove the interconnect cable (Section 3.2.1). 4. Disconnect the 3-wire, 5-pin On/Off switch cable (P4) from the connector (J4) at the top of the power supply by pressing the tab on top of the connector (Figure 3–6). -
Page 29: Removing The Power Supply
Removing and Replacing FRUs 3–9 5. Loosen the captive screw that holds the power supply to the chassis (Figure 3–7). 6. Slide the power supply module out of the card guides. P o w e r S u p p l y M A - 0 2 3 1 - 9 0 . -
Page 30: Discharging The Crt And Removing The Anode Cap
3–10 Removing and Replacing FRUs 3.2.3 Discharging the CRT and Removing the Anode Cap Discharging the CRT is a process that 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. -
Page 31: Discharging The Crt And Removing The Anode Cap
Removing and Replacing FRUs 3–11 A . P u s h i n t h e d i r e c t i o n o f t h e a r r o w . B . W h e n o n e b a r b i s f r e e p u s h i n t h e o p p o s i t e d i r e c t i o n ( s e e a r r o w s ) t o r e m o v e a n o d e c a p . -
Page 32: Deflection Module
3–12 Removing and Replacing FRUs 3.2.4 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). 2. Remove the top cover (Section 3.1.3). 3. -
Page 33: Loosening The Captive Screw
Removing and Replacing FRUs 3–13 2 - W i r e , 3 - P i n C a b l e D e f l e c t i o n M o d u l e V i d e o C a s t i n g A s s e m b l y 6 - W i r e , 8 - P i n... -
Page 34: Disconnecting Cables From The Deflection Module
3–14 Removing and Replacing FRUs 9. Disconnect the 9-wire, 9-pin raster control cable (P6) from the connector (J6) at the top of the deflection module by pressing the tab on top of the connector. 10. Disconnect the multicolored, 6-wire, 9-pin CRT/yoke cable (P11) from the connector (J11) on the deflection module by pressing the tabs on the connector (Figure 3–10). -
Page 35: Removing The Deflection Module
Removing and Replacing FRUs 3–15 11. Slide the deflection module out of the card guides (Figure 3–11). C a r d G u i d e D e f l e c t i o n M o d u l e MA-0235-90.DG Figure 3–11 Removing the Deflection Module... -
Page 36: Video Casting Assembly
3–16 Removing and Replacing FRUs 3.2.5 Video Casting Assembly Remove the video casting assembly as follows: 1. Remove the rear cover (Section 3.1.2). 2. Remove the top cover (Section 3.1.3). 3. Remove the interconnect cable (Section 3.2.1). 4. Remove the 2-wire, 3-pin cable (P4) from the connector (J4) at the top of the video casting assembly (Figure 3–12) by pressing on the sides of the connector and pulling. -
Page 37: Removing Cables From The Video Casting
Removing and Replacing FRUs 3–17 2 - W i r e , 3 - P i n C a b l e 6 - W i r e , 8 - P i n B r i g h t n e s s / C o n t r a s t C a b l e M A - 0 2 3 6 - 9 0 . -
Page 38: Removing The Crt Socket Connector
3–18 Removing and Replacing FRUs C R T S o c k e t C o n n e c t o r S o c k e t P i n s M A - 0 2 3 8 - 9 0 . D G Figure 3–13 Removing the CRT Socket Connector 7. -
Page 39: Removing The Video Casting
Removing and Replacing FRUs 3–19 V i d e o C a s t i n g A s s e m b l y M A - 0 2 3 7 - 9 0 . D G Figure 3–14 Removing the Video Casting... -
Page 40: Crt/Chassis Assembly
3–20 Removing and Replacing FRUs 3.2.6 CRT/Chassis Assembly To disassemble the CRT/chassis assembly: 1. Remove the rear cover (Section 3.1.2). 2. Remove the top cover (Section 3.1.3). 3. Remove the interconnect cable (Section 3.2.1) 4. Remove the power supply module (Section 3.2.2) 5. -
Page 41: Crt Disposal (Trained Service Personnel Only)
Removing and Replacing FRUs 3–21 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. - Page 42 3–22 Removing and Replacing FRUs 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.
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Page 43: Crushing The Evacuation Point
Removing and Replacing FRUs 3–23 M A - X 0 6 6 7 - 8 8 Figure 3–15 Crushing the Evacuation Point 3. Seal the carton with packing tape and dispose of it in the Digital site’s trash receptacle. NOTE The safe "gassing"... -
Page 44: Tilt-Swivel Base
3–24 Removing and Replacing FRUs 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. -
Page 45: Tilt-Swivel Base
Removing and Replacing FRUs 3–25 T e e t h o f S w i v e l C l a m p M o n i t o r B a s e M o n i t o r ( B o t t o m V i e w ) M A - 0 2 3 9 - 9 0 . -
Page 47: Aligning The Video Monitor
Aligning the Video Monitor 4.1 Introduction This chapter describes how to align the monitor display. You do not have to perform every adjustment procedure each time you align the monitor; however, you should check all adjustments in the order shown. The success of one adjustment may depend on the accuracy of the preceding adjustments with the exception of the FOCUS and G2 adjustments. -
Page 48: Monitor Controls And Indicators
Degauss switch Not installed The VR315 has a degauss icon on the bezel because this bezel was planned for use with a companion color product. The VR315 and VR325 monochrome monitors do not have or need a degauss switch. -
Page 49: User Controls And Indicator
Aligning the Video Monitor 4–3 M A - 1 2 9 5 - 8 9 . D G Figure 4–1 User Controls and Indicator... -
Page 50: Check Leds And Heater Filament
4–4 Aligning the Video Monitor 4.1.2 Check LEDs and Heater Filament Visually check the monitor to ensure that the following components are • LED on the power switch • LED on the deflection module • CRT heater filament 4.1.3 Displaying Screen Tests The procedures in this chapter refer to a circle-crosshatch alignment test pattern (Figure 4–2) and an all-white test pattern. -
Page 51: Monitor Adjustments
To avoid scratching the screen with the tape’s metal clip, start the measurement at 10 cm. See Figure 4–3. 199 mm VR315 - 236 mm VR325 - 265 mm MA-0301-90.DG LJ-00545-TI0 Figure 4–3... -
Page 52: Deflection Adjustments
4–6 Aligning the Video Monitor 4.3 Deflection Adjustments 4.3.1 Raster Adjustment 1. Set the user controls (Figure 4–1) on the top and the bottom of the monitor in the center position of the thumbwheels. 2. Adjust the Contrast control just until the raster displays. 3. -
Page 53: Internal Controls
Aligning the Video Monitor 4–7 7. Repeat step 4 until the correct size, centering, and linearity is obtained. Then continue with step 8. Width HLin HLin HCen G a i n G a i n Focus (G4) Anode HPhase VCen VLin Height VHold... -
Page 54: Using The Radiance Meter
4–8 Aligning the Video Monitor 4.4 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 4–5). CAUTION Avoid excessive force when tightening the occluder or you may damage the radiance meter. -
Page 55: Radiance Meter
Aligning the Video Monitor 4–9 O c c l u d e r A C A d a p t e r A C A d a p t e r C o n n e c t o r S e n s o r H e a d P o w e r... -
Page 56: Using The Radiance Meter
4–10 Aligning the Video Monitor MA-0302-90.DG Figure 4–6 Using the Radiance Meter 4.5 Cutoff Adjustment To adjust G2 control, use the radiance meter on the screen (Figure 4–6). Check and adjust G2 (Figure 4–7) as follows: 1. Set the Brightness to minimum and Contrast controls to maximum. 2. -
Page 57: Gain Adjustment
Aligning the Video Monitor 4–11 4.6 GAIN Adjustment 1. Set the Contrast control to maximum and Brightness control for background extinction. 2. Set GAIN using the All-White pattern to obtain 0.283 luminance at the screen center. Ga in MA-0300-90.DG Figure 4–7 GAIN, G2, and FOCUS (G4) Adjustments... -
Page 59: Vr315 And Vr325 Documentation
VR315 and VR325 Documentation You can order the following VR315 and VR325 documents, some of which are available in several languages, from Digital. Contact your sales representative for availability and more information. Installing and Using the VR315 and VR325 Monochrome Monitors...
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