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2.2.4 Video Card - Potentiometers

RV600 White Video Gain

RV652 Green Video Gain

RV632 Red Video Gain

RV651 Green Video Cutoff

RV631 Red Video Cutoff

RV671 Blue Video Cutoff

PICTURE 4

Figure 4. Video Card, Gain and Cutoff Controls

IBM PS/2 8511 and 8518 Color Displays HMS

Video Card - Potentiometers

¦ Copyright IBM Corp. 1992.

2.2.4 - 1

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Содержание PS/2 8511

Страница 1: ... Personal System 2 8511 and 8518 Color Displays Hardware Maintenance Service supplement Document Number S41G 2925 00 Part Number 41G2925 IBM PS 2 8511 and 8518 Color Displays HMS Book Cover Copyright IBM Corp 1992 COVER 1 ...

Страница 2: ...2 Maintenance Controls and Internal Connectors 2 2 1 Analog Card Potentiometers 2 2 2 Connectors Internal 2 2 3 EHT Transformer 2 2 4 Video Card Potentiometers 2 3 Preliminary Steps 2 4 Geometry 2 5 Video Levels and Cutoff Voltages 2 5 1 Procedure Using a Color Analyzer 2 6 Focus 2 7 Degaussing 3 0 Tools and Test Equipment 3 1 Test Equipment Setup 3 2 8511 Color Display Parts 3 3 Color Display 851...

Страница 3: ...d 8518 Color Displays It is intended to be used with the IBM Personal System 2 Hardware Maintenance Service part number 15F2200 form number S15F 2200 Refer to the Hardware Maintenance Service General Information for the following information General safety Electrical safety Safety inspection guide Part Number 41G2925 Form Number S41G 2925 00 Copyright International Business Machines Corporation 19...

Страница 4: ... document The furnishing of this document does not give you any license to these patents You can send license enquiries to the IBM Director of Commercial Relations IBM Corporation Purchase NY 10577 The warranty terms and conditions applicable in the country of purchase in respect of an IBM product are available from the supplier Please retain them with your proof of purchase The following terms de...

Страница 5: ...ded The display must never be left unattended with the covers removed and powered on in a customer environment DO NOT adjust RV100 factory adjustment only To prevent electrical shock power off the display and disconnect the power cord before you change any part High voltages may remain on the anode of the CRT after the display is powered off Discharge in accordance with CRT safety instructions CRT...

Страница 6: ...ial checks visual and power confirm whether or not the display is ready for operation Subtopics 1 1 1 Visual check 0100 1 1 2 Power check 0110 IBM PS 2 8511 and 8518 Color Displays HMS Initial Checks Copyright IBM Corp 1992 1 1 1 ...

Страница 7: ...isually for damage and ensure that the connectors are properly attached IS THE DISPLAY DAMAGED Yes No 002 Go to Power check 003 Exchange the damaged parts Go to Power check IBM PS 2 8511 and 8518 Color Displays HMS Visual check 0100 Copyright IBM Corp 1992 1 1 1 1 ...

Страница 8: ... to On and to Off several times DOES THE POWER SWITCH OPERATE NORMALLY Yes No 002 Install new card tray assembly 003 Set the power switch to Off Connect a power cord that is known to be good to the display and then to the electrical power outlet Set the power switch to On IS THE POWER LED ON Yes No 004 Install new card tray assembly 005 Continue with Self Test IBM PS 2 8511 and 8518 Color Displays...

Страница 9: ...imum from left to right 5 The self test pattern on the screen should be a full white raster a pattern of horizontal scanned lines with a black border 2 mm to 20 mm 0 08 in to 0 79 in The black border may not be on all four sides 6 If the self test pattern does not appear go to Basic Function Checks in topic 1 3 PICTURE 2 Figure 2 Self Test Pattern IBM PS 2 8511 and 8518 Color Displays HMS Self Tes...

Страница 10: ... If no raster appears replace ITC Test raster is not white Adjust gain controls for missing colors If colors reappear reset color point of ITC Otherwise replace ITC Background raster is not white Adjust cutoff controls for missing colors If colors reappear reset color point of ITC Otherwise replace ITC Test raster scan is collapsed If partially collapsed adjust as horizontally or vertically approp...

Страница 11: ...ly are not working Maximum or minimum Video color point is not set Adjust as white is poor appropriate East west pincushion Adjust RV302 for optimum vertical lines If correction EWPCC this is not possible replace the card tray is poor vertical assembly lines are bowed or barrel shaped No horizontal or If good with test raster signal cable vertical disconnected replace signal cable synchronization ...

Страница 12: ...o the IBM Personal System 2 8511 and 8518 Color Displays Hardware Maintenance Reference for details of how to get access to maintenance controls All adjustments must be completed in the sequence given here Subtopics 2 1 Test Equipment 2 2 Maintenance Controls and Internal Connectors 2 3 Preliminary Steps 2 4 Geometry 2 5 Video Levels and Cutoff Voltages 2 6 Focus 2 7 Degaussing IBM PS 2 8511 and 8...

Страница 13: ...pment Refer to Tools and Test Equipment for details of tools and test equipment required Subtopics 2 1 1 Setup of Test Equipment IBM PS 2 8511 and 8518 Color Displays HMS Test Equipment Copyright IBM Corp 1992 2 1 1 ...

Страница 14: ... Test Equipment Ensure that the connections of all cables are set up as shown in Tools and Test Equipment in topic 3 0 IBM PS 2 8511 and 8518 Color Displays HMS Setup of Test Equipment Copyright IBM Corp 1992 2 1 1 1 ...

Страница 15: ...e 3 Analog and Video Cards Subtopics 2 2 1 Analog Card Potentiometers 2 2 2 Connectors Internal 2 2 3 EHT Transformer 2 2 4 Video Card Potentiometers IBM PS 2 8511 and 8518 Color Displays HMS Maintenance Controls and Internal Connectors Copyright IBM Corp 1992 2 2 1 ...

Страница 16: ...justment Only RV400 Vertical Height RV302 East West Pincushion Correction EWPCC RV401 Vertical Centering RV303 Horizontal Width RV304 Raster Centering IBM PS 2 8511 and 8518 Color Displays HMS Analog Card Potentiometers Copyright IBM Corp 1992 2 2 1 1 ...

Страница 17: ...put P300 Synchronization P401 Horizontal and Vertical Coils P301 P601 Video Card Supply Interface Fixed P400 P802 Control Card Interface P600 Video Test Signal IBM PS 2 8511 and 8518 Color Displays HMS Connectors Internal Copyright IBM Corp 1992 2 2 2 1 ...

Страница 18: ...2 2 3 EHT Transformer G2 Control Focus IBM PS 2 8511 and 8518 Color Displays HMS EHT Transformer Copyright IBM Corp 1992 2 2 3 1 ...

Страница 19: ...reen Video Gain RV632 Red Video Gain RV651 Green Video Cutoff RV631 Red Video Cutoff RV671 Blue Video Cutoff PICTURE 4 Figure 4 Video Card Gain and Cutoff Controls IBM PS 2 8511 and 8518 Color Displays HMS Video Card Potentiometers Copyright IBM Corp 1992 2 2 4 1 ...

Страница 20: ...rds 2 Power on the system unit and the Display The system unit runs its internal checks and then loads the program from the diskette 3 With the Brightness control set to center detent midpoint adjust G2 and Focus until the setup menu is visible Select pattern C and adjust the G2 control to give minimum background illumination 4 Allow 20 minutes for the display to warm up before making any further ...

Страница 21: ...RV302 East West Pincushion to set the most straight vertical lines d You may have to repeat steps a b and c 2 Using the same test pattern adjust sequentially RV400 Vertical Height and RV401 Vertical Centering Set the picture in the center of the screen with a gap of 11 mm for 8511 Color Displays 7 5 mm for 8518 Color Displays measured at the vertical center line of the screen between the horizonta...

Страница 22: ... midpoint If necessary adjust G2 to ensure that the screen is just not illuminated 2 Select Pattern B white block 3 Ensure that the Contrast control is at midpoint 4 Adjust RV652 green and RV632 red for correct white color points 5 Set Contrast to maximum 6 Set RV600 to midpoint 7 Select pattern E gray scale blocks 8 Check at maximum and minimum contrast that the gradation of the blocks is even fr...

Страница 23: ...2 0 01 f Set the Brightness control to center detent midpoint If necessary adjust G2 to ensure that the screen is just not illuminated 2 Select pattern B white block 3 Ensure that the Contrast control is at midpoint 4 Adjust RV652 green and RV632 red for correct white color points Using a Minolta Color Analyzer or equivalent in accordance with the manufacturer s instructions this is x 0 297 0 01 y...

Страница 24: ...atch pattern 2 Adjust the Focus control to give sharp vertical and horizontal lines Take care not to disturb the G2 setting This completes the alignment procedures IBM PS 2 8511 and 8518 Color Displays HMS Focus Copyright IBM Corp 1992 2 6 1 ...

Страница 25: ...in conjunction with a degauss coil on the ITC When the mains input voltage is applied to the display the peak inrush current through the coil is limited by one half of the dual PTC while the other half is heated by the current flow in it Equilibrium is achieved when the heat in one half of the PTC is sufficient to prevent current flow in the other half and consequently in the degauss coil When deg...

Страница 26: ...tools IBM part 59X6319 Hex head 2 mm trimming tool part 39F8405 Screwdriver flat blade Socket set 1 4 in drive part 1650830 Torx kit part 39F8407 Nonmagnetic metric rule Safety glasses Optional equipment TV Color Analyzer Minolta or equivalent Trademark of Textron Incorporated For a list of trademarks see page FRONT_1 Subtopics 3 1 Test Equipment Setup 3 2 8511 Color Display Parts 3 3 Color Displa...

Страница 27: ...3 1 Test Equipment Setup Set up the equipment as shown in Figure 5 PICTURE 5 Figure 5 Test Equipment Setup IBM PS 2 8511 and 8518 Color Displays HMS Test Equipment Setup Copyright IBM Corp 1992 3 1 1 ...

Страница 28: ... Cover set for Model 8511001 14G3056 Cover set for Model 8511002 14G3057 Cover set for Model 8511003 14G3058 Cover set for Model 8511004 14G3059 Signal cable 45F1544 Tilt Swivel Stand 38F3909 Small parts kit 45F1545 FRU packaging with cushion USA 92F8592 FRU packaging with cushion EMEA 7312115 Display Power Cords 1 8 m 6 ft for U S Canada Taiwan S Korea Mexico 38F3908 Central and Southern America ...

Страница 29: ...715 Cover set for Model 8518003 45F1542 Cover set for Model 8518004 45F1543 Cover set for Model 8518022 14G3069 Signal cable 45F1544 Tilt Swivel Stand for Models 8518001 8518022 38F3909 Lift Tilt Swivel Stand for Models 8518002 8518003 8518004 6398210 Small parts kit 45F1545 FRU packaging with cushion USA for Models 8518001 8518003 and 8518004 74F8717 FRU packaging with cushion EMEA for Model 8518...

Страница 30: ...3 4 Notes Subtopics 3 4 1 RID Tag IBM PS 2 8511 and 8518 Color Displays HMS Notes Copyright IBM Corp 1992 3 4 1 ...

Страница 31: ...a repair identification RID tag must be applied Use a blank RID tag part 6342125 and complete it with the name type and serial number of the original tag Printed in the U S A IBM PS 2 8511 and 8518 Color Displays HMS RID Tag Copyright IBM Corp 1992 3 4 1 1 ...

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