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Apple 20 - page 1
Service Source K Apple Multiple Scan 20 Display Apple Multiple Scan 20 Display Apple Multiple Scan 20 Display, Rev. B ...
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Apple 20 - page 2
Service Source K Basics Apple Multiple Scan 20 Display ...
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Apple 20 - page 3
Basics Version Differences - 2 Version Differences Over view The Apple Multiple Scan 20 Display and Apple Multiple Scan 20 Display Rev. B have the same overall appearance. However, the Rev. B version offers improved performance and better screen resolution. To distinguish the two versions, check the last three digits of the serial number. The seria ...
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Apple 20 - page 4
Basics Version Differences - 3 Multiple Scan 20 Display Dot pitch 0.31 mm. Multiple Scan 20 Display , Rev . B Dot pitch 0.26 mm. Requires Rev. B parts for Main Deflection Board, Microprocessor Controller Board, and Power Supply. As you go through this manual, consider the information applicable to both versions unless specified otherwise. ...
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Apple 20 - page 5
Basics Monitor Distortion - 4 Monitor Distortion Over view All large-screen monitors are susceptible to distortions caused by environmental conditions. These distortions are usually not visible on monitors with smaller screens. Important: Even monitors set to factory specifications may appear distorted when set up in a new environment. Common envir ...
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Apple 20 - page 6
Basics Monitor Distortion - 5 Ideal Raster Raster Shifted Up and Left Raster Shifted Up and Right ...
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Apple 20 - page 7
Basics Monitor Distortion - 6 En vironmental Influences The following environmental conditions may distort the raster: • Proximity to metal objects, such as metal desks, file cabinets, and bookshelves. Metal objects affect the earth’s magnetic field. Earth magnetism usually distorts only the edges of the screen. • Fluorescent lights, other m ...
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Apple 20 - page 8
Basics - 7 Right Edge Not Straight Left Side Bowed Out Right Side Bowed In ...
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Apple 20 - page 9
Basics - 8 T roubleshooting Important: Exchanging the monitor cannot correct environmental distortion problems. Note: If the monitor has shifted up/down or right/left only, go ahead and adjust it using the user controls. However, keep in mind that if you then move the monitor you may need to readjust the centering controls. Before adjusting a monit ...
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Apple 20 - page 10
Basics - 9 If the display changes (for better or worse) when you move it to another location, the environment is the source of the problem. Relocate your monitor or remove the distortion- causing object. If the display does not change when you move it to another location, continue troubleshooting the problem (refer to Troubleshooting). ...
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Apple 20 - page 11
Basics - 1 0 Upper-Right Corner Rounded Left Edge S-Shaped Raster Tilted Right ...
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Apple 20 - page 12
Basics EEPROM Settings - 1 1 EEPROM Settings Caution: To prevent data loss or corruption, always save EEPROM settings before you replace the microprocessor board. See Troubleshooting for instructions on saving the EEPROM settings from the old microprocessor board and restoring the settings on the new microprocessor board. If the settings are lost b ...
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Apple 20 - page 13
Basics EEPROM Settings - 1 2 Microprocessor Board ...
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Apple 20 - page 14
Service Source K Specifications Apple Multiple Scan 20 Display ...
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Apple 20 - page 15
Specifications Characteristics - 1 Characteristics Picture T ube 20-in. diagonal Trinitron CRT (19.1-in. viewable image) Multiple scan Bonded glass panel with antiglare/antistatic multilayer coating Screen Resolution 640x480 to 1280x1024 0.31-mm stripe pitch 0.26-mm stripe pitch for Multiple Scan 20 Display, Rev. B Scan Rates Vertical refresh range ...
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Apple 20 - page 16
Specifications Characteristics - 2 V ideo Input Signals Video: red, green, and blue analog signals; RS-343A standard;.714 V peak to peak; positive going Sync on green: RS-343A compatible level;.286 V ± 10% negative-going during blanking intervals Separate Sync: 1 to 5 V peak to peak; negative or positive going Composite Sync: 1 to 5 V peak to peak ...
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Apple 20 - page 17
Specifications Controls and Ports - 3 Controls and Ports User Controls Front panel: power, reset, and control buttons; brightness and contrast controls Additional controls available using the command button: horizontal and vertical shift, horizontal and vertical size, rotation, horizontal and vertical convergence, and color temperature Automatic de ...
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Apple 20 - page 18
Specifications Physical and Electrical - 4 Physical and Electrical Po wer Supply Universal power supply Voltage: 90–132 and 198–264 VAC, self-configuring Frequency: 47–63 Hz Power: 165 W maximum (less than 15 W in energy-saver mode) Size and W eight Height: 18.5 in. (474 mm) Width: 18.5 in. (474 mm) Depth: 19.6 in. (501.5 mm) Monitor weight: ...
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Apple 20 - page 19
Specifications Physical and Electrical - 5 Monitor Stand Built-in, tilt-and-swivel stand; tilt: -5 to +15°; swivel range: ±45° minimum Three ADB ports (two ADB ports are in the front of the stand and one ADB port is at the rear of the stand) ...
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Apple 20 - page 20
Specifications Environmental - 6 En vironmental T emperature Operating: 50°F to 104°F (10°C to 40°C) Storage: 32°F to 140°F (0°C to 60°C) Shipping: -4°F to 140°F (-40°C to 60°C) Altitude Operating: to 10,000 ft. (1,067 m) Shipping: to 35,000 ft. (3,048 m) Humidity Operating: 10-80% maximum, noncondensing Storage: 5-90% maximum, nonconde ...
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Apple 20 - page 21
Service Source K Troubleshooting Apple Multiple Scan 20 Display ...
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Apple 20 - page 22
Troubleshooting General - 1 General The Symptom Charts included in this chapter will help you diagnose specific symptoms related to your product. Because cures are listed on the charts in the order of most likely solution, try the first cure first. Verify whether or not the product continues to exhibit the symptom. If the symptom persists, try the ...
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Apple 20 - page 23
Troubleshooting First Checklist - 2 First Checklist Important: Over 60% of the Apple Multiple Scan 20 Display modules returned for repair are found to be fully operational. Read this checklist before you return a module. Prevent needless module replacement and unnecessary time delays. The Apple Multiple Scan 20 Display is not fully compatible with ...
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Apple 20 - page 24
Troubleshooting First Checklist - 3 The CRT raster will not always resemble a perfect rectangle. CRT tolerances allow for some distortion. Additional distortion can be caused by magnetized metal objects (desks, file cabinets, etc.). Move the unit to a different location if you notice raster bowing or bent raster edges. Jitter, faint lines, or scree ...
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Apple 20 - page 25
Troubleshooting First Checklist - 4 A misadjusted screen can mimic the symptoms of deflection board or CRT failures. By performing the adjustment procedures, you might determine if one or more of the adjustments is the cause of the problem. CRTs rarely fail. Needless CRT replacements can be prevented by checking display adjustments, checking the po ...
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Apple 20 - page 26
Troubleshooting Display Setting Restoration/ Connect the Hardware - 5 Display Setting Restoration Each Multiple Scan 20 Display has an EEPROM (located on the microprocessor controller board) that contains adjustment information specific to that monitor. Before you replace the microprocessor board, save this EEPROM information. Use MacTest Pro Displ ...
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Apple 20 - page 27
Troubleshooting Display Setting Restoration - 6 must be turned off). Also connect a power cable to the display. Adv antage: You do not have to shut down the host computer or quit MacTest Pro to complete the repair. Disadv antage: This method requires a separate host computer (with display). 2 Connect the display as usual, using a video cable and po ...
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Apple 20 - page 28
Troubleshooting Display Setting Restoration/ Save the EEPROM Information - 7 the old EEPROM, you must quit MacTest Pro and shut down the computer to install the new EEPROM. Save the EEPROM Information To save information from the old EEPROM, create a data file: 1 Start MacTest Pro. 2 Choose “Apple Multiple Scan 20 Display.” 3 Select “Test.” ...
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Apple 20 - page 29
Troubleshooting Display Setting Restoration/ Restore the EEPROM Information - After the new microprocessor board is installed, the new EEPROM will have default settings that allow you to read the display, but with difficulty. When the settings from the old EEPROM are transferred to the new EEPROM, the display should be clear and the last color temp ...
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Apple 20 - page 30
Troubleshooting Display Setting Restoration - 9 Caution: Make certain that you are aware of the following important information about the EEPROM data file. If data is lost or corrupted, you will have to return the display to Apple for repair. • Make sure that the data in the saved file is written back to the display used to create the file. Each ...
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Apple 20 - page 31
Troubleshooting Symptom Charts/ Raster - 10 Symptom Charts Raster No raster; power indicator light on 1 Ensure monitor’s video cable is properly connected to computer or video card in the computer. 2 Replace main deflection board. 3 Replace microprocessor board after downloading settings as described in “Display Setting Restoration” in this c ...
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Apple 20 - page 32
Troubleshooting Symptom Charts/ Raster (Continued) - 1 1 Raster (Continued) Raster jumps Replace microprocessor board after downloading settings as described in “Display Setting Restoration” in this chapter. Caution: To prevent data loss or corruption, always save EEPROM settings before you replace the microprocessor board. Raster edges have co ...
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Apple 20 - page 33
Troubleshooting Symptom Charts/ Raster (Continued) - 1 2 Raster (Continued) Raster distorted; no picture 1 Replace microprocessor board after downloading settings as described in “Display Setting Restoration” in this chapter. Caution: To prevent data loss or corruption, always save EEPROM settings before you replace the microprocessor board. 2 ...
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Apple 20 - page 34
Troubleshooting Symptom Charts/ Power - 13 Power Monitor does not power up 1 Ensure monitor’s video cable is properly connected to computer or video card in the computer, and check other cable connections. 2 Replace power supply. Monitor shuts down 1 Ensure monitor’s video cable is properly connected to computer or video card in the computer. 2 ...
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Apple 20 - page 35
Troubleshooting Symptom Charts/ Indicator Lights - 1 4 Indicator Lights Convergence indicator light blinks or stays on; power indicator light might also blink Replace microprocessor board after downloading settings as described in “Display Setting Restoration” in this chapter. Caution: To prevent data loss or corruption, always save EEPROM sett ...
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Apple 20 - page 36
Troubleshooting Symptom Charts/ Indicator Lights (Continued) - 1 5 Indicator Lights (Continued) Rotation indicator light blinks or stays on; power indicator light might also blink Replace main deflection board. ...
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Apple 20 - page 37
Troubleshooting Symptom Charts/ Indicator Lights (Continued) - 1 6 Indicator Lights (Continued) Size indicator light blinks or stays on; power indicator light might also blink 1 Replace main deflection board. 2 Replace CRT/video board. 3 Replace microprocessor board after downloading settings as described in “Display Setting Restoration” in thi ...
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Apple 20 - page 38
Troubleshooting Symptom Charts/ Indicator Lights (Continued) - 1 7 Indicator Lights (Continued) Centering indicator light blinks or stays on; power indicator light might also blink 1 Replace main deflection board. 2 Replace microprocessor board after downloading settings as described in “Display Setting Restoration” in this chapter. Caution: To ...
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Apple 20 - page 39
Troubleshooting Symptom Charts/ Miscellaneous - 18 Miscellaneous Picture dim; adjusting front panel controls does not increase brightness 1 Ensure that screen does not face a window or other source of ambient light. This type of environment gives screen a dim appearance. 2 Replace CRT/video board. Picture has vertical jitter 1 Move monitor to diffe ...
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Apple 20 - page 40
Troubleshooting Symptom Charts/ Miscellaneous (Continued) - 1 9 Miscellaneous (Continued) Monitor emits snapping sound; raster blinks for an instant Note: This symptom, caused by foreign particles inside the CRT, normally occurs only in new monitors. If the symptom persists after 40 hours of operation, there is a hardware problem. 1 Replace power s ...
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Apple 20 - page 41
Troubleshooting Symptom Charts/ Miscellaneous (Continued) - 2 0 Miscellaneous (Continued) Upon first use, monitor screen shows cloth-like pattern of black, dark gray, or white fine vertical lines 1 Select the all white display pattern, and adjust size and rotation controls on the monitor’s front panel. Aim for reducing the visibility of the lines ...
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Apple 20 - page 42
Service Source K T ake Apart Apple Multiple Scan 20 Display ...
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Apple 20 - page 43
Take Apart Rear Cover - 1 Rear Cover N o preliminary steps are required before you begin this procedure. ± W arning: This product contains high voltage and a high-vacuum picture tube. To prevent serious injury, review CRT safety in Bulletins/Safety. Rear Cover ...
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Apple 20 - page 44
Take Apart Rear Cover - 2 1 With the monitor face- down on a protective pad, remove the four case screws and pull the rear cover off the chassis. 2 Route the video cable through the cover. Video Cable ...
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Apple 20 - page 45
Take Apart Bezel - 3 Bezel Before you begin, remove the following: • Rear cover • EMI shield ± W arning: This product contains high voltage and a high-vacuum picture tube. To prevent serious injury, review CRT safety in Bulletins/Safety. Bezel ...
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Apple 20 - page 46
Take Apart Bezel - 4 1 Remove the grounding screw. Grounding Screw ...
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Apple 20 - page 47
Take Apart Bezel - 5 2 Remove the four large hex head screws and remove the bezel. Hex Head Screw Bezel ...
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Apple 20 - page 48
Take Apart EMI Shield - 6 EMI Shield Before you begin, • Remove the rear cover • Discharge the CR T ± W arning: This product contains high voltage and a high-vacuum picture tube. To prevent serious injury, review CRT safety in Bulletins/Safety. ± W arning: Never use a grounding wriststrap until after discharging the CRT. Note: The EMI shield ...
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Apple 20 - page 49
Take Apart EMI Shield - 7 1 Remove the 12 screws from the shield. (Three screws are located on the left side of the EMI shield.) EMI Shield ...
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Apple 20 - page 50
Take Apart EMI Shield - 8 2 Slide the shield toward the back of the monitor and lift off the shield. EMI Shield ...
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Apple 20 - page 51
Take Apart CRT/Video Board - 9 CRT/Video Board Before you begin, • Remove the rear cover • D i s charge the CRT • Remove the EMI shield ± W arning: This product contains high voltage and a high-vacuum picture tube. To prevent serious injury, review CRT safety in Bulletins/Safety. CRT/Video Board ...
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Apple 20 - page 52
Take Apart CRT/Video Board - 1 0 ± W arning: Never use a grounding wriststrap until after discharging the CRT. 1 Caution: When removing the ground strap from the CRT/ video board, be careful not to apply excessive pressure to the neck of the CRT. Disconnect the ground strap from the terminal on the front of the CRT/ video board shield. 2 Disconnec ...
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Apple 20 - page 53
Take Apart CRT/Video Board - 1 1 Caution: When disconnecting the followin g cables from the CRT/video board, be careful not to apply excessive pressure to the neck of the CRT. 3 Disconnect these cables from the CRT/video board: • 11-wire cable (CN302) • 7-wire cable (CN303) • 3-wire cable (CN301) • R, G, and B video cables R,G,B Cables CN30 ...
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Apple 20 - page 54
Take Apart CRT/Video Board - 1 2 Caution: When disconnecting the following cables from the CRT/video board, be careful not to apply excessive pressure to the neck of the CRT. 4 Disconnect these cables from the CRT/video board: • 1-wire cable (CN702) • 6-wire cable (CN304) • 3-wire cable (CN701) Ê CN304 CN701 CN702 ...
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Apple 20 - page 55
Take Apart CRT/Video Board - 1 3 Caution: When removing the video cable from the CRT/video board, be careful not to apply excessive pressure to the neck of the CRT. 5 Remove the screw securing the video cable clip to the CRT/video board shield. Video Cable Clip ...
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Apple 20 - page 56
Take Apart CRT/Video Board - 1 4 Caution: Twisting, bending, or applying force to the CRT/video board could damage the neck of the CRT. Be sure to pull the CRT/ video board straight off the CRT. 6 Loosen the mounting screw and pull the CRT/ video board straight off the neck of the CRT. CRT/Video Board Mounting Screw ...
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Apple 20 - page 57
Take Apart CRT/Video Board - 1 5 7 Remove the two plastic cable clips on the focus VR control cables. 8 Disconnect the FV1 and FV2 cables from the focus control board. FV1 Cable FV2 Cable Plastic Cable Clip ...
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Apple 20 - page 58
Take Apart Power Supply - 16 Power Supply Before you begin, • Remove the rear cover • Discharge the CRT • Remove the EMI shield ± W arning: This product contains high voltage and a high-vacuum picture tube. To prevent serious injury, review CRT safety in Bulletins/Safety. ± W arning: Never use a grounding wriststrap until after discharging ...
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Apple 20 - page 59
Take Apart Power Supply - 17 1 Disconnect these cables from the power supply: • 8-wire cable (CN602) • 5-wir e cable (CN603) • 2-wire cable (CN604) • Ground strap 2 Remove the wiring harness from the plastic cable clip. CN602 Ground CN603 CN604 Strap ...
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Apple 20 - page 60
Take Apart Power Supply - 18 3 Disconnect these cables from the AC interconnect board: • C N1600 • CN1601 4 Remove plastic cable clips. CN1601 CN1600 Plastic Cable Clips ...
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Apple 20 - page 61
Take Apart Power Supply - 19 5 Remove th e screw securing the ground strap to the chassis. 6 Remove the screw securing the power supply to the chassis. 7 Slide the power supply toward the rear of the monitor and lift out the power supply. Screw Ground Strap Screw ...
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Apple 20 - page 62
Take Apart Power Supply - 20 8 D i sconnect connector CN601. CN601 ...
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Apple 20 - page 63
Take Apart Fuse - 2 1 Fuse Before you begin, • Remove the rear cover • Discharge the CRT • Remove the EMI shield • Remove the power supply ± W arning: This product contains high voltage and a high-vacuum picture tube. To prevent serious injury, review CRT safety in Bulletins/Safety. Fuse ...
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Apple 20 - page 64
Take Apart Fuse - 2 2 ± W arning: Never use a grounding wriststrap until after discharging the CRT. 1 Remove the plastic cover from the fuse holder. 2 Pry the fuse from the fuse holder using a jeweler’s screwdriver. Replacement Note: Be sure to replace the fuse with another fuse of the same amperage and voltage rating. Fuse Holder ...
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Apple 20 - page 65
Take Apart Focus VR Control - 2 3 Focus VR Control Before you begin, • R emove the rear cover • Discharge the CRT • Remove the EMI shield ± W arning: This product contains high voltage and a high-vacuum picture tube. To prevent serious injury, review CRT safety in Bulletins/Safety. Focus VR Control ...
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Apple 20 - page 66
Take Apart Focus VR Control - 2 4 ± W arning: Never use a grounding wriststrap until after discharging the CRT. 1 Disconnect these cables from the focus control: •M V • FV1 • FV2 • VIDF • HIDF FV1 Cable VIDF Cable FV2 Cable MV Cable HIDF Cable ...
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Apple 20 - page 67
Take Apart Focus VR Control - 2 5 2 Remove the screw securing the ground strap to the chassis. 3 Remove the screw securing the focus control to the chassis. 4 Lift out the focus control. Focus Control Focus Control Ground Strap Screw Screw ...
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Apple 20 - page 68
Take Apart AC Inlet Assembly - 26 AC Inlet Assembly Before you begin, • Remove the rear cover • Disch arge the CRT • Remove the EMI shield • Remove the power supply ± W arning: This product contains high voltage and a high-vacuum picture tube. To prevent serious injury, review CRT safety in Bulletins/Safety. AC Inlet Assembly ...
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Apple 20 - page 69
Take Apart AC Inlet Assembly - 27 ± W arning: Never use a grounding wriststrap until after discharging the CRT. 1 Disconnect these cables from the AC interconnect board: • CN1600 • CN1601 2 Remove the screw securing the AC inlet ground strap to the chassis. CN1601 CN1600 Screw ...
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Apple 20 - page 70
Take Apart AC Inlet Assembly - 28 3 Remove the two screws securing the AC inlet assembly to the chassis. 4 Lift out the AC inlet assembly. Screw Screw AC Inlet Assembly ...
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Apple 20 - page 71
Take Apart Serial I/O Board - 29 Serial I/O Board Before you begin, • Remove the rear cover • Discharge the CRT • Remove the EMI shield ± W arning: This product contains high voltage and a high-vacuum picture tube. To prevent serious injury, review CRT safety in Bulletins/Safety. ± W arning: Never use a grounding wriststrap until after disc ...
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Apple 20 - page 72
Take Apart Serial I/O Board - 30 1 Disconnect these cables from the serial I/O board: • CN250 • CN253 (from video cable) • CN254 (from CRT/ video board) 2 Remove the two screws securing the serial I/O board to the rear panel. 3 Lift out the serial I/O board. Serial I/O Board Screw Screw CN250 CN254 CN253 ...
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Apple 20 - page 73
Take Apart Serial I/O Board - 31 Replacement Note: The 3-pin connector from the video cable connects to connector CN253 and the 3-pin connector from the CRT/video board connects to connector CN254. ...
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Apple 20 - page 74
Take Apart Video Cable - 3 2 Video Cable Before you begin, • Remove the rear cover • Discharge the CRT • Remove the EMI shield ± W arning: This product contains high voltage and a high-vacuum picture tube. To prevent serious injury, review CRT safety in Bulletins/Safety. ± W arning: Never use a grounding wriststrap until after discharging t ...
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Apple 20 - page 75
Take Apart Video Cable - 3 3 1 Disconnect connector CN253 from the serial I/O board. 2 Disconnect the R, G, and B cables from the CRT/ video board. R,G,B Cables CN253 Serial I/O Board ...
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Apple 20 - page 76
Take Apart Video Cable - 3 4 3 Caution: When removing the video cable from the CRT/ video board, be careful not to apply excessive pressure to the neck of the CRT. Remove the screw securing the video cable clip to the CRT/video board shield. 4 Remove the plastic cable clip. Video Cable Clip ...
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Apple 20 - page 77
Take Apart Video Cable - 3 5 5 Remove the two screws securing the rear panel to the chassis. 6 Rotate the rear panel away from the chassis. 7 Remove the rear panel from the chassis. Rear Panel ...
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Apple 20 - page 78
Take Apart Video Cable - 3 6 8 Remove the two screws securing the cable clamp to the rear panel. 9 Remove the video cable. Screw Screw ...
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Apple 20 - page 79
Take Apart Ma i n D e f le c t i o n B o a r d - 3 7 Main Deflection Board Before you begin, • Remove the rear cover • Discharge the CRT • Remove the EMI shield • Remove the power supply ± W arning: This product contains high voltage and a high-vacuum picture tube. To prevent serious injury, review CRT safety in Bulletins/Safety. Main Defl ...
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Apple 20 - page 80
Take Apart Ma i n D e f le c t i o n B o a r d - 3 8 1 Disconnect the MV cable from the focus VR control. 2 Remove the two plastic cable clips on the focus VR control cables. 3 Remove the screw securing the ground strap to the chassis. 4 Remove the screw securing the focus control to the chassis. 5 Lift out the focus control and let it h ang outsid ...
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Apple 20 - page 81
Take Apart Ma i n D e f le c t i o n B o a r d - 3 9 6 Disconnect these cables from the serial I/O board: • CN250 • CN253 (from video cable) • CN254 (from CRT/ video board) Replacement Note: The 3-pin connector from the video cable connects to connector CN253 and the 3-pin connector from the CRT/video board connects to connector CN254. Ê CN2 ...
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Apple 20 - page 82
Take Apart Ma i n D e f le c t i o n B o a r d - 4 0 7 Caution: When disconnecting the following cables from the CRT/video board, be careful not to apply excessive pressure to the neck of the CRT. Disconnect these cables from the CRT/video board: • 11-wire cable (CN302) • 7-wire cable (CN303) • R, G, and B video cables Ê R,G,B Cables CN302 C ...
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Apple 20 - page 83
Take Apart Ma i n D e f le c t i o n B o a r d - 4 1 8 Caution: When removing the video cable from the CRT/ video board, be careful not to apply excessive pressure to the neck of the CRT. Remove the screw securing the video cable clip to the CRT/video board shield. Video Cable Clip ...
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Apple 20 - page 84
Take Apart Ma i n D e f le c t i o n B o a r d - 4 2 9 Disconnect these cables from the main deflection board : • 2-wire cable (CN401) • 2-wire cable (CN502) • 2-wire cable (CN1604) • 6-wire cable (CN505) • 5-wire cable (CN504) • 5-wire cable (CN400) ...
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Apple 20 - page 85
Take Apart Ma i n D e f le c t i o n B o a r d - 4 3 • 6-wire cable (CN501) • gold-colored connector • 6-pin connector (control panel) ...
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Apple 20 - page 86
Take Apart Ma i n D e f le c t i o n B o a r d - 4 4 1 0 Remove the cables from the plastic cable clip. ...
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Apple 20 - page 87
Take Apart Ma i n D e f le c t i o n B o a r d - 4 5 1 1 Remove the two screws securing the main d e flection board carrier to the chassis. (Only one screw is shown in the illustration. The other screw is on the opposite side of the carrier.) 12 Slide back the carrier. 1 3 Remove the main deflection board. Screw ...
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Apple 20 - page 88
Take Apart Microprocessor Board - 46 Microprocessor Board Before you begin, • Save EEPROM settings • Remove the rear cover • Discharge the CRT • Remove the EMI shield • Remove the power supply • Remove the main deflection board Important: Before you replace the microprocessor board, save the EEPROM settings. See Troubleshooting for inst ...
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Apple 20 - page 89
Take Apart Microprocessor Board - 47 ± W arning: This product contains high voltage and a high-vacuum picture tube. To prevent serious injury, review CRT safety in Bulletins/Safety. ± W arning: Never use a grounding wriststrap until after discharging the CRT. ...
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Apple 20 - page 90
Take Apart Microprocessor Board - 48 Important: Make sure you save the EEPROM settings befor e replacing the microprocessor board. 1 Disconnect these cables from the microprocessor board: • 11-wire cable (CN901) • 7-wire cable (CN902) • 6-wire cable (CN907) • 5-wire cable (CN908) 2 Remove the microprocessor board. CN908 CN907 CN901 CN902 ...
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Apple 20 - page 91
Take Apart Tilt/Swivel Assembly - 49 Tilt/Swivel Assembly Before you begin, • Remove the rear cover • Discharge the CRT • Remove the EMI shield • Remove the power supply • Remove the main deflection board ± Warning: This product contains high voltage and a high-vacuum picture tube. To prevent serious injury, review CRT safety in Bulletin ...
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Apple 20 - page 92
Take Apart Tilt/Swivel Assembly - 50 ± W arning: Never use a grounding wriststrap until after discharging the CRT. 1 With the monitor face- down on a protective pad, remove the two screws securing the tilt/swivel assembly to the chassis. (Only one screw is shown in the illustration. The other screw is on the opposite side of the tilt/swivel assemb ...
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Apple 20 - page 93
Take Apart Control Panel - 51 Control Panel Before you begin, • Remove the cover • Discharge the CRT • Remove the anode cap • Remove the EMI shield • Remove the power supply • Remove the main deflection board • Remove the tilt/swivel assembly Control Panel ...
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Apple 20 - page 94
Take Apart Control Panel - 52 ± W arning: This product contains high voltage and a high-vacuum picture tube. To prevent serious injury, review CRT safety in Bulletins/Safety. ± W arning: Never use a grounding wriststrap until after discharging the CRT. ...
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Apple 20 - page 95
Take Apart Control Panel - 53 1 Remove the screw securing the control panel ground strap to the chassis. 2 Remove the ground wire from the plastic cable clip. 3 Remove the two screws securing the control panel board support to the front bezel. 4 Lift out the control panel board and support. Grounding Strap Control Plastic Cable Clip Panel ...
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Apple 20 - page 96
Take Apart ADB Board - 5 4 ADB Board No preliminary steps are required before you begin this procedure. ADB Board ...
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Apple 20 - page 97
Take Apart ADB Board - 5 5 1 With the monitor face- down on a protective pad, r e move the two screws securing the ADB board cover and remove the cover. 2 Lift out the ADB board. ...
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Apple 20 - page 98
Service Source K Adjustments Apple Multiple Scan 20 Display ...
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Apple 20 - page 99
Adjustments Brightness and Contrast - 1 Brightness and Contrast No preliminary steps are required before you begin this procedure. Adjustment controls are located on the f ront panel. Front Panel ...
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Apple 20 - page 100
Adjustments Brightness and Contrast - 2 Brightness 1 Press the + button to increase the brightness. 2 Press the – button to decrease the brightness. Brightness Controls ...
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Apple 20 - page 101
Adjustments Brightness and Contrast - 3 Contrast 1 Press the + button to i n crease the contrast. 2 Press the – button to decrease the contrast. Contrast Controls ...
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Apple 20 - page 102
Adjustments Geometry - 4 Geometry No preliminary steps are requ ired before you begin this procedure. Adjustment controls are located on the front panel. Front Panel ...
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Apple 20 - page 103
Adjustments Geometry - 5 V ertical Center 1 Press the select button to turn on the centering indicator light. 2 Press the + or – button on the brightness controls to move the center of the picture up or down. Centering Indicator Light Brightness Controls Select Button Crosshatch ...
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Apple 20 - page 104
Adjustments Geometry - 6 Horizontal Center 1 Press the select button to turn on the centering indicator light. 2 Press the + or – button on the contrast controls to move the center of the picture right or left. Crosshatch Centering Indicator Light Select Button Contrast Controls ...
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Apple 20 - page 105
Adjustments Geometry - 7 V ertical Size 1 Press the select button repeatedly until the size indicator light goes on. 2 Press the + or – button on the brightness controls to increase or decrease the size of the picture. Crosshatch Brightness Controls Select Button Size Indicator Light ...
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Apple 20 - page 106
Adjustments Geometry - 8 Horizontal Size 1 Press the select button repeatedly until the size indicator light goes on. 2 Press the + or – button on the contrast controls to increase or decrease the size of the picture. Size Indicator Light Select Button Contrast Controls Crosshatch ...
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Apple 20 - page 107
Adjustments Geometry - 9 Rotation and Color Unif ormity 1 Press the select button repeatedly until the rotation indicator light goes on. 2 Press the + button on the brightness controls to tilt the picture clockwise. 3 Press the – button on the brightness controls to tilt the picture counterclockwise. Crosshatch Rotation Indicator Light Select But ...
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Apple 20 - page 108
Adjustments Geometry - 1 0 Note: When the picture rotates, the color uniformity also changes. Rotating the picture clockwise causes colors to darken on the lower right of the screen; rotating the picture counterclockwise causes colors to darken on the lower left. When rotation and color uniformity are set properly, the picture is rectangular and al ...
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Apple 20 - page 109
Adjustments Geometry - 1 1 Shape 1 Press the select button repeatedly until the rotation indicator light goes on. 2 Press the + button on the contrast controls to expand the sides of the picture. 3 Press the – button on the contrast controls to bring in the sides of the picture. Crosshatch Rotation Indicator Light Select Button Contrast Controls ...
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Apple 20 - page 110
Adjustments Convergence - 1 2 Convergence No preliminary steps are required before you begin this procedure. Adjustment controls are located on the front panel. Note: When the convergence is set properly, the picture is crisp and clear. Front Panel ...
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Apple 20 - page 111
Adjustments Convergence - 1 3 V ertical Con ver gence 1 Press the select button repeatedly until the convergence indicator light goes on. 2 Press the + button on the brightness controls to move the red signal up and the blue signal down. 3 Press the – button on the brightness controls to move the red signal down and the blue signal up. Crosshatch ...
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Apple 20 - page 112
Adjustments Convergence - 1 4 Horizontal Con vergence 1 Press the select button repeatedly until the convergence indicator light goes on. 2 Press the + button on the contrast controls to move the red signal to the right and the blue signal to the left. 3 Press the – button on the contrast controls to move the red signal to the left and the blue s ...
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Apple 20 - page 113
Adjustments Color Temperature - 1 5 Color Temperature N o p reliminary steps are required before you begin this procedure. Color temperature refers to the intensity of the red/ green/blue signals sent to the monitor. The color temperature settings are • 9300 K: white appears bluish (default) • 6500 K: white appears page white • 5000 K: white ...
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Apple 20 - page 114
Adjustments Color Temperature - 1 6 Color temperature can be changed to accommodate preference or application specifications. Adjustment controls are located on the front panel. ...
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Apple 20 - page 115
Adjustments Color Temperature - 1 7 1 Press the select button repeatedly until the color temperature indicator light goes on. Note: The indicator may or may not blink, depending on the color temperature selected. A steady light indicates 9300 K, a slow blinking light indicates 6500 K, and a fast blinking light indicates 5000 K. Color Temperature In ...
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Apple 20 - page 116
Adjustments Color Temperature - 1 8 2 Press the + button on the contrast controls to increase the color temperature. 3 Press the – button on the contrast controls to decrease the color temperature. Color Temperature Indicator Light Select Button Contrast Controls ...
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Apple 20 - page 117
Adjustments Factory Settings - 1 9 Factory Settings No preliminary steps are required before you begin this procedure. Important: The monitor controls are set at the factory. To fine-tune and adjust the picture, use the front panel controls. The monitor will use your settings each time the computer is turned on. Use the recall function to return to ...
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Apple 20 - page 118
Adjustments Factory Settings - 2 0 Recall Note: You can reset brightness and contrast to their factory levels; however, you cannot reset one or the other. You must reset both controls. Use a straightened paper clip to push in the reset button. Reset Button ...
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Apple 20 - page 119
Adjustments Factory Settings - 2 1 Reset a Specific Contr ol 1 Press the select button repeatedly until the indicator light of the picture control you want to reset (vertical or horizontal center, convergence, or color temperature) goes on. 2 Use a straightened paper clip to push in the reset button. The selected picture control is reset to its or ...
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Apple 20 - page 120
Adjustments Factory Settings - 2 2 Reset All Controls While holding down the control button, push in the reset button with a straightened paper clip. All picture controls are reset to their factory levels. Control Button Reset Button ...
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Apple 20 - page 121
Service Source K Exploded V ie w Apple Multiple Scan 20 Display ...
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Apple 20 - page 122
Exploded View 1 922-0730 Bezel CRT Assembly (not offered) 922-0733 Focus VR Control 922-0685 922-1570 (Rev B) Microprocessor Control Board 661-0996 (Rev B) 661-0506 Main Deflection Board 661-0507 CRT Video Board ADB Board Cover 922-0687 ADB Board 922-0732 Video Cable 922-0734 Re ...
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