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Digital Equipment VR319 Service Manual

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VR319 Monitor Service Guide
Order Number EK-VR319-SV-001
Digital Equipment Corporation

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  • Page 1 VR319 Monitor Service Guide Order Number EK-VR319-SV-001 Digital Equipment Corporation...
  • Page 2 1st Edition, May 1990 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.

  • Page 3: Table Of Contents

    Contents About This Manual Overview Product Description ....... . 1–1 1.1.1 Refresh Rate .
  • Page 4 Horizontal Dynamic Focus (HPARAB) ....4–21 Changing the Refresh Rate VR319 Monitor Refresh Rates ......5–1 Changing the Refresh Rate .
  • Page 5 Index Figures 1–1 VR319 Monochrome Monitor ......1–1 3–1 Power Switch/Indicator ......
  • Page 6 Tools and Equipment ....... 1–2 1–3 VR319 Recommended Spares ......1–3 2–1 Blank Screen, No Video or Raster .

  • Page 7: About This Manual

    About This Manual 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.

  • Page 8: Overview

    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.

  • Page 9: Refresh Rate

    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 Refresh...

  • Page 10: Recommended Spares List

    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...

  • Page 11: Troubleshooting

    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: •...

  • Page 12: Troubleshooting Procedures

    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.

  • Page 13: 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 Power cord is not Connect the power cord to the or raster. Power to the connected to the power source or monitor. monitor is on (power power source or switch is in), but the...

  • Page 14: Blank Screen, No Video But Raster Present

    2–4 Troubleshooting Table 2–2 Blank Screen, No Video but Raster Present Symptom Possible Cause Suggested Solution Raster can be Host system’s CRT Press any key to reactivate the displayed by screen saver feature display. adjusting the is activated. brightness control, but no video or Power to the host Turn power to the host system...

  • Page 15: Poor Display Quality

    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 controls on See section 4.1. centering, and/or top of the monitor are linearity.
  • Page 16 2–6 Troubleshooting Table 2–3 (Cont.) Poor Display Quality Symptom Possible Cause Suggested Solution Deflection module is Replace the deflection module faulty. (Section 3.2.2). Power supply module Replace the power supply is faulty. module (Section 3.2.5). Poor light output Brightness or contrast Adjust the brightness and (using the all-white controls are set too...
  • Page 17 Troubleshooting 2–7 Table 2–3 (Cont.) Poor Display Quality Symptom Possible Cause Suggested Solution Deflection module is Replace the deflection module faulty. (Section 3.2.2). Faulty CRT/chassis Replace the CRT/chassis assembly assembly (Section 3.2.6) only after trying the previous solutions. Linearity is Adjustment is Perform the vertical incorrect.

  • Page 18: Removing And Replacing Frus

    Removing and Replacing FRUs 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.

  • Page 19: Rear Cover Removal

    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). P o w e r S w i t c h / I n d i c a t o r M A - 1 2 3 9 - 8 9 .

  • Page 20: Removing The Power Cord

    Removing and Replacing FRUs 3–3 2. Unplug the power cord from the wall outlet first, then from the monitor (Figure 3–2). P o w e r C o r d P o w e r S o u r c e F r o m H o s t S y s t e m M A - 1 2 2 3 - 8 9 .

  • Page 21: Sample Signal Cable

    3–4 Removing and Replacing FRUs 3. Remove the signal cable from the rear of the monitor. Push the connector in and turn it left until the signal cable is released from the connector (Figure 3–3). S i g n a l C a b l e M A - 1 2 2 4 - 8 9 .
  • Page 22 Removing and Replacing FRUs 3–5 4. Use a 9/32 Allen driver to loosen the four captive screws that hold the rear cover to the enclosure (Figure 3–4). NOTE The rear cover may be difficult to pull off. 5. Remove the rear cover by pulling the cover towards you. A l l e n H e a d S c r e w ( 4 ) R e a r C o v e r...

  • Page 23: Top Cover Removal

    3–6 Removing and Replacing FRUs 3.1.2 Top Cover Removal Remove the top cover as follows: 1. Remove the rear cover (Section 3.1.1). 2. Tilt the top cover up (Figure 3–5). T o p C o v e r M A - 1 2 2 7 - 8 9 . D G Figure 3–5 Tilting the Top Cover...

  • Page 24: Removing The Top Cover

    Removing and Replacing FRUs 3–7 3. Slide the top cover toward the back of the monitor (Figure 3–6). T o p C o v e r M A - 1 2 2 6 - 8 9 . D G Figure 3–6 Removing the Top Cover...

  • Page 25: Field Replaceable Units (Frus)

    3–8 Removing and Replacing FRUs 3.2 Field Replaceable Units (FRUs) The VR319 monitor FRUs are shown in Figure 3–7. Before replacing any FRUs, see Section 3.1. WARNING Turn power to the monitor off and disconnect the power cord before disconnecting or replacing any FRU.

  • Page 26: Interconnect Cable

    Removing and Replacing FRUs 3–9 3.2.1 Interconnect Cable Remove the interconnect cable as follows: 1. Remove the rear cover (Section 3.1.1)and the top cover (Section 3.1.2). 2. Disconnect the interconnect cable (P3) by pulling the connector off the deflection module (J3) (Figure 3–8). 3.

  • Page 27: Deflection Module

    3–10 Removing and Replacing FRUs 3.2.2 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 3.1.1). 2. Remove the top cover (Section 3.1.2). 3.

  • Page 28: Removing The 2-Wire, 3-Pin Cable

    Removing and Replacing FRUs 3–11 C a b l e C l a m p D e f l e c t i o n 2 - W i r e , M o d u l e 3 - P i n C a b l e V i d e o I n t e r c o n n e c t C a s t i n g...

  • Page 29: Disconnecting Cables From The Deflection Module

    3–12 Removing and Replacing FRUs 6. Disconnect the 6-wire, 9-pin braided CRT/yoke cable (P11) on the deflection module by pressing the tabs on the connector (J11) (Figure 3–10). 7. Disconnect the 9-wire, 9-pin raster control cable (P6) on the deflection module by pressing the tab on top of the connector (J6).

  • Page 30: Removing The Deflection Module

    Removing and Replacing FRUs 3–13 8. 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 C a r d G u i d e M A - 1 2 3 1 - 8 9 .

  • Page 31: Refresh Rate Jumper On Deflection Module

    3–14 Removing and Replacing FRUs NOTE Before you replace the deflection module, make sure that the 66/72 Hz refresh jumper near the left side of the module (Figure 3–12) is set correctly for your system. Check the refresh rate setting on the module you are replacing and move the jumper if needed.

  • Page 32: Video Casting Assembly

    Removing and Replacing FRUs 3–15 3.2.3 Video Casting Assembly Remove the video casting assembly as follows: 1. Remove the rear cover (Section 3.1.1 and the top cover.) 2. Disconnect the interconnect cable (P3) at the deflection module (J3). 3. Disconnect the interconnect cable (P2) by pressing the plastic tabs outward and then removing the cable from the video casting (J2) (Figure 3–13).

  • Page 33: Disconnecting The Brightness/Contrast Cable

    3–16 Removing and Replacing FRUs 4. Disconnect the 2-wire, 3-pin cable (P7) by pressing the tabs on the connector (J7). 5. Position the 2-wire, 3-pin cable connector next to the cable clamp so it does not interfere with the video casting removal procedure. 6.

  • Page 34: Removing The Crt Socket Connector

    Removing and Replacing FRUs 3–17 7. Gently push the CRT socket connector off the socket pins (Figure 3–15). 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 - 1 2 3 5 - 8 9 .

  • Page 35: Removing The Video Casting

    3–18 Removing and Replacing FRUs 8. Loosen the two spring-loaded captive screws until they spring out toward you. The screws hold the video casting assembly to the chassis. 9. Gently pull the top of the video casting assembly towards you. 10.

  • Page 36: Crt Discharge

    Removing and Replacing FRUs 3–19 3.2.4 CRT Discharge Discharging the CRT is a process that drains to ground any leftover voltages remaining in the extra-high tension (EHT) cable after power is removed. Discharge the CRT as follows: WARNING The following steps expose you to the CRT anode, which may store a high voltage.

  • Page 37: Discharging The Crt And Removing The Anode Cap

    3–20 Removing and Replacing FRUs A n o d e D i s c h a r g e T o o l 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 .

  • Page 38: Power Supply Module

    Removing and Replacing FRUs 3–21 3.2.5 Power Supply Module Remove the power supply module as follows: WARNING You must discharge voltages from the CRT (Section 3.2.4) before removing the power supply module. 1. Remove the rear cover (Section 3.1.1). 2. Remove the top cover (Section 3.1.2). 3.

  • Page 39: Removing The Led Cable From The Power Supply

    3–22 Removing and Replacing FRUs 4. Disconnect the 3-wire, 5-pin LED cable (P4) by pressing the tab on top of the connector (J4) (Figure 3–19). P o w e r S u p p l y M o d u l e 3 - W i r e , 5 - P i n , L E D C a b l e M A - 1 2 4 1 - 8 9 .
  • Page 40 Removing and Replacing FRUs 3–23 5. Loosen the two captive screws on the power supply. 6. Slide the power supply module out of the card guides (Figure 3–20). P o w e r S u p p l y M o d u l e P h i l l i p s H e a d S c r e w s ( 2 ) M A - 1 2 4 2 - 8 9 .

  • Page 41: Refresh Rate Jumper On The Power Supply

    3–24 Removing and Replacing FRUs NOTE Before you replace the power supply, make sure that the 66/72 Hz jumper (P9) near the bottom of the module (Figure 3–21) is set correctly for your system. The jumper covers all but one pin. Refresh Rate Move Jumper To Cover 66 Hz...

  • Page 42: Crt/Chassis Assembly

    Removing and Replacing FRUs 3–25 3.2.6 CRT/Chassis Assembly Remove the CRT/chassis assembly as follows: • Remove the rear cover (Section 3.1.1). • Remove the top cover (Section 3.1.2). • Remove the deflection module (Section 3.2.2). • Remove the video casting assembly (Section 3.2.3). WARNING You must discharge voltage from the CRT (Section 3.2.4) before removing the power supply module.
  • Page 43 3–26 Removing and Replacing FRUs Handling a CRT • Never handle the CRT by the neck. Always use two hands and hold the CRT by the sides near the face. • Keep the CRT away from your body during handling. •...
  • Page 44 Removing and Replacing FRUs 3–27 WARNING To avoid eye or hand injury always wear goggles and gloves when you work with a CRT. Never handle pieces of phosphor-coated glass without wearing protective gloves. Before you perform the following procedure, remove the FRUs listed in Section 3.2.6.

  • Page 45: Crt Disposal Procedure

    3–28 Removing and Replacing FRUs M A - X 0 6 6 7 - 8 8 Figure 3–22 CRT Disposal Procedure 3. Seal the carton with packing tape and dispose of it in the Digital site’s trash receptacle. NOTE The safe "gassing" of the CRT is necessary to prevent liability and safety problems that may arise from accidental CRT implosion.

  • Page 46: 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 47: Displaying Screen Tests

    4–2 Aligning the Video Monitor Clean the Screen A dirty screen may distort a focused display. 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). Prepare the Monitor Before you make any adjustments, prepare the monitor as follows: 1.

  • Page 48: Monitor Adjustments

    Aligning the Video Monitor 4–3 4.2 Monitor Adjustments 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. The user adjustments are shown in Figure 4–1.

  • Page 49: Adjustment Locations

    4–4 Aligning the Video Monitor The location of the internal controls and adjustments are shown in Figure 4–2. NOTE The HHOLD and DFOCUS phase adjustments are set at the factory. Therefore, adjustment procedures for these controls are not included in this guide. Slide the deflection module out one-half inch to read the labels for the adjustment potentiometers (Figure 4–2).

  • Page 50: Using The Metric Measuring Tape

    Aligning the Video Monitor 4–5 NOTE In the following steps, use a metric measuring tape (PN 29- 25342) to measure the dimensions of the screen display. To avoid scratching the screen with the tape’s metal clip, start the measurement at 10 cm. See Figure 4–3. 2 7 3 m m 3 4 2 m m M A - 1 2 5 6 - 8 9 .

  • Page 51: Height Adjustments

    4–6 Aligning the Video Monitor 4.3 Height Adjustments Check the height of the display using the following adjustments. 4.3.1 Vertical Centering (VCEN) and Vertical Linearity (VLIN) Check and adjust vertical centering and linearity as follows: 1. Display the circle-crosshatch pattern (Figure 4–4). 2.

  • Page 52: Vcen, Vhold, Height, And Vlin Controls

    Aligning the Video Monitor 4–7 5. Turn the VHOLD adjustment (Figure 4–5) until the height of the top squares equals the height of the bottom squares. (Do not be concerned about the height of the pattern in this step.) 6. Turn the VLIN adjustment until all the squares on the screen are of equal height.

  • Page 53: Vertical Height (Height)

    4–8 Aligning the Video Monitor 4.3.2 Vertical Height (HEIGHT) Check and adjust the vertical height as follows: 1. Check the circle-crosshatch pattern or the all-white pattern for a vertical height of 273 mm (± 2.0 mm). 2. If necessary, adjust the HEIGHT control (Figure 4–6) until the display height is 273 mm.

  • Page 54: Width Adjustments

    Aligning the Video Monitor 4–9 4.4 Width Adjustments Centering, width, and linearity adjustments interact with each other. When you complete one, recheck the others. Check the width of the display using the following adjustments. 4.4.1 Horizontal Phase, Horizontal Linearity, and Horizontal Centering (HPHASE, HLIN, HCEN) Check and adjust the horizontal centering of the screen display as follows: NOTE...

  • Page 55: Width Controls

    4–10 Aligning the Video Monitor 3. Turn the brightness control until the raster is visible. You may have to decrease the contrast control to see the raster. (If you cannot get the raster to display on the screen, adjust G2 (Section 4.6). 4.
  • Page 56 Aligning the Video Monitor 4–11 7. Decrease the brightness just until the raster disappears. 8. Adjust HLIN for maximum width of the circle-crosshatch pattern. 9. Readjust HLIN slightly until all the squares are of equal width across the screen. 10. If the raster is too wide or too narrow, perform the horizontal width (WIDTH) adjustment (Section 4.4.2) before continuing.

  • Page 57: Horizontal Width (Width)

    4–12 Aligning the Video Monitor 4.4.2 Horizontal Width (WIDTH) Check and adjust the horizontal width as follows: NOTE In the following steps, use a metric measuring tape (PN 29- 25342) to measure the dimensions of the screen display. To avoid scratching the screen with the tape’s metal clip, start the measurement at 10 cm (100 mm).

  • Page 58: Vertical Hold Adjustment (Vhold)

    Aligning the Video Monitor 4–13 4.5 Vertical Hold Adjustment (VHOLD) This procedure prevents rolling of the screen display. It also affects Vertical Linearity (VLIN) and Vertical Height (Height). 1. Set the contrast and brightness controls for comfortable viewing. 2. Display the circle/crosshatch pattern. 3.

  • Page 59: Vhold Control

    4–14 Aligning the Video Monitor V H o l d M A - 1 2 5 0 - 8 9 . D G Figure 4–10 VHOLD Control...

  • Page 60: Bias Adjustment (G2 )

    Aligning the Video Monitor 4–15 4.6 Bias Adjustment (G2 ) Perform the following procedure to adjust the G2 bias control (Figure 4–11): 1. Set the brightness control to maximum and contrast control to minimum. 2. Slowly turn the G2 counter clockwise until the vertical retrace lines are visible.

  • Page 61: Using The Radiance Meter

    4–16 Aligning the Video Monitor 4.7 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 4–12). CAUTION Avoid excessive force when tightening the occluder or you may damage the radiance meter.

  • Page 62: Using The Radiance Meter

    Aligning the Video Monitor 4–17 3. Turn power to the monitor on. NOTE Do not use the POWER ON W/BACKLIGHT position when you are using the radiance meter with batteries. 4. Set the range switch to the second position from the top (1.999). 5.

  • Page 63: Gain Adjustment (Ggain)

    4–18 Aligning the Video Monitor 4.8 Gain Adjustment (GGAIN) To adjust and verify the gain control, use the radiance meter on the all- white pattern on the screen (Figure 4–13). Check and adjust the gain (Figure 4–14) as follows: 1. Increase the contrast setting. 2.

  • Page 64: Focus Adjustments (G4)

    Aligning the Video Monitor 4–19 4.9 Focus Adjustments (G4) NOTE Make sure the screen is clean. A dirty screen can distort a focused display. Use a soft tissue or cloth and a non-abrasive, nonflammable glass cleaner, or use Digital’s video screen cleaner (PN VT3XX-SC).

  • Page 65: Focus Control (G4)

    4–20 Aligning the Video Monitor 4. If necessary, adjust the FOCUS (G4) control (Figure 4–16) so the intersecting lines are sharp. F o c u s ( G 4 ) H P a r a b V P a r a b M A - 1 2 5 3 - 8 9 .

  • Page 66: Vertical Dynamic Focus (Vparab)

    Aligning the Video Monitor 4–21 4.9.1 Vertical Dynamic Focus (VPARAB) Examine the top center and bottom center for sharpness. Adjust VPARAB for the best focus at the top and bottom center. 4.9.2 Horizontal Dynamic Focus (HPARAB) Check and adjust the horizontal dynamic focus as follows: 1.

  • Page 67: Changing The Refresh Rate

    Changing the Refresh Rate This chapter describes how to change the refresh rate of the monitor. 5.1 VR319 Monitor Refresh Rates Table 5–1 lists the different VR319 models and their refresh rates. Table 5–1 Monitor Model Refresh Rates Model Pixels x Lines...

  • Page 68: Adjusting The Monitor For A New Refresh Rate

    5–2 Changing the Refresh Rate 5.2.1 Adjusting the Monitor for a New Refresh Rate Use the following procedures to change the monitor refresh rate: 1. Change the refresh jumper on the deflection module. (Section 3.2.2). 2. Change the refresh jumper on the power supply module. (Section 3.2.5).
  • Page 69 Changing the Refresh Rate 5–3 M o d e l : V R 3 1 9 S N : P r o d u c t C o n v e r s i o n F r o m : 7 0 8 A L i s t e d T o :...

  • Page 70: Alignment Screens

    Alignment Screens This appendix describes the screen patterns used to diagnose deflection problems as well as patterns to perform deflection checks and adjustments. A.1 Circle-Crosshatch Pattern Use the circle-crosshatch pattern for all alignment tests. Use this pattern as a reference for customers who work primarily with graphic applications.

  • Page 71: All-White Pattern

    A–2 Alignment Screens A.2 All-White Pattern Use this pattern to check for the correct setting of the horizontal and vertical controls, as well as the Gain adjustment. M A - 1 2 5 4 - 8 9 . D G Figure A–2 All-White Pattern...
  • Page 72 VR319 Documentation In addition to this guide, you can order the following VR319 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 VR319 Monochrome Monitor...
  • Page 73 Index Adjustments Bias (G2) adjustment, 4–15 bias (G2), 4–15 Blank screen dynamic focus, 4–21 without video but raster present focus (G4), 4–19 See Table 2–2. GGAIN, 4–18 without video or raster HCEN, 4–9 see Table 2–1. HEIGHT, 4–8 Brightness/contrast HLIN, 4–9 cable, 3–16 HPARAB, 4–21 HPHASE, 4–9, 4–10...
  • Page 74 2 Index Deflection module Interconnect cable part number, 1–3 part number, 1–3 removal, 3–10, 3–13 removal, 3–9 DFOCUS adjustment, 4–4 Discharging CRT, 3–19, 3–20 Displaying test screens, 4–2 Disposing of CRT, 3–25 Jumpers, refresh rate Documentation deflection module, 3–14 IPB, B–1 power supply, 3–24 print set, B–1 Dynamic focus...
  • Page 75 Video casting assembly part number, 1–3 removal, 3–15, 3–18 Safety goggles VLIN adjustment, 4–6, 4–13 handling CRT, 3–27 VPARAB adjustment, 4–21 part number, 1–2 VR319 monitor Schematics, B–1 adjustments, 4–3 Southern Hemisphere aligning, 4–1 CRT/chassis assembly, 1–3 alignment screens, A–1...
  • Page 76 4 Index VR319 monitor (Cont.) troubleshooting, 2–5 changing refresh rates, 5–1 user controls, 4–3 cleaning, 4–2, 4–19 description, 1–1 documentation, B–1 models, 1–2 Width adjustments pixels, 1–2 HCEN, 4–9 product label, 5–2 HLIN, 4–9 refresh rates, 1–2 HPHASE, 4–9, 4–10 removal and replacement WIDTH, 4–12...

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