Apple Multiple Scan 20 Display Spécifications Page 1

Service Source K Apple Multiple Scan 20Display Apple Multiple Scan 20 DisplayApple Multiple Scan 20 Display, Rev. B

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. Relocat

Adjustments Brightness and Contrast - 2 Brightness 1 Press the + button to increase the brightness.2 Press the – button to decrease the brightness.B

Adjustments Brightness and Contrast - 3 Contrast 1 Press the + button to increase the contrast.2 Press the – button to decrease the contrast.Contras

Adjustments Geometry - 4 Geometry No preliminary steps are required before you begin this procedure.Adjustment controls are located on the front pan

Adjustments Geometry - 5 Vertical Center 1 Press the select button to turn on the centering indicator light.2 Press the + or – button on the brightn

Adjustments Geometry - 6 Horizontal Center 1 Press the select button to turn on the centering indicator light.2 Press the + or – button on the contr

Adjustments Geometry - 7 Vertical Size 1 Press the select button repeatedly until the size indicator light goes on.2 Press the + or – button on the

Adjustments Geometry - 8 Horizontal Size 1 Press the select button repeatedly until the size indicator light goes on.2 Press the + or – button on th

Adjustments Geometry - 9 Rotation and Color Uniformity 1 Press the select button repeatedly until the rotation indicator light goes on.2 Press the +

Adjustments Geometry - 10 Note: When the picture rotates, the color uniformity also changes. Rotating the picture clockwise causes colors to darke

Adjustments Geometry - 11 Shape 1 Press the select button repeatedly until the rotation indicator light goes on.2 Press the + button on the contrast

Basics - 10Upper-Right Corner Rounded Left Edge S-Shaped Raster Tilted Right

Adjustments Convergence - 12 Convergence No preliminary steps are required before you begin this procedure.Adjustment controls are located on the fr

Adjustments Convergence - 13 Vertical Convergence 1 Press the select button repeatedly until the convergence indicator light goes on.2 Press the + b

Adjustments Convergence - 14 Horizontal Convergence 1 Press the select button repeatedly until the convergence indicator light goes on.2 Press the +

Adjustments Color Temperature - 15 Color Temperature No preliminary steps are required before you begin this procedure.Color temperature refers to t

Adjustments Color Temperature - 16 Color temperature can be changed to accommodate preference or application specifications.Adjustment controls are

Adjustments Color Temperature - 17 1 Press the select button repeatedly until the color temperature indicator light goes on. Note: The indicator m

Adjustments Color Temperature - 18 2 Press the + button on the contrast controls to increase the color temperature.3 Press the – button on the contr

Adjustments Factory Settings - 19 Factory Settings No preliminary steps are required before you begin this procedure. Important: The monitor contr

Adjustments Factory Settings - 20 Recall Note: You can reset brightness and contrast to their factory levels; however, you cannot reset one or the

Adjustments Factory Settings - 21 Reset a Specific Control 1 Press the select button repeatedly until the indicator light of the picture control you

Basics EEPROM Settings - 11 EEPROM Settings Caution: To prevent data loss or corruption, always save EEPROM settings before you replace the microp

Adjustments Factory Settings - 22 Reset All Controls While holding down the control button, push in the reset button with a straightened paper clip.

Service Source K Exploded View Apple Multiple Scan 20 Display

Exploded View 1 922-0730BezelCRT Assembly(not offered)922-0733Focus VRControl922-0685922-1570 (Rev B)MicroprocessorControl Board661-0996

Basics EEPROM Settings - 12Microprocessor Board

Service Source K Specifications Apple Multiple Scan 20 Display

Specifications Characteristics - 1 Characteristics Picture Tube 20-in. diagonal Trinitron CRT (19.1-in. viewable image)Multiple scanBonded glass pan

Specifications Characteristics - 2 Video Input Signals Video: red, green, and blue analog signals; RS-343A standard;.714 V peak to peak; positive go

Specifications Controls and Ports - 3 Controls and Ports User Controls Front panel: power, reset, and control buttons; brightness and contrast contr

Specifications Physical and Electrical - 4 Physical and Electrical Power Supply Universal power supplyVoltage: 90–132 and 198–264 VAC, self-configur

Specifications Physical and Electrical - 5 Monitor Stand Built-in, tilt-and-swivel stand; tilt: -5 to +15°; swivel range: ±45° minimumThree ADB port

Service Source K Basics Apple Multiple Scan 20 Display

Specifications Environmental - 6 Environmental Temperature 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

Service Source K Troubleshooting Apple Multiple Scan 20 Display

Troubleshooting General - 1 General The Symptom Charts included in this chapter will help you diagnose specific symptoms related to your product. Be

Troubleshooting First Checklist - 2 First Checklist Important: Over 60% of the Apple Multiple Scan 20 Display modules returned for repair are foun

Troubleshooting First Checklist - 3 The CRT raster will not always resemble a perfect rectangle. CRT tolerances allow for some distortion. Addition

Troubleshooting First Checklist - 4 A misadjusted screen can mimic the symptoms of deflection board or CRT failures. By performing the adjustment p

Troubleshooting Display Setting Restoration/Connect the Hardware - 5 Display Setting Restoration Each Multiple Scan 20 Display has an EEPROM (locate

Troubleshooting Display Setting Restoration - 6 must be turned off). Also connect a power cable to the display. Advantage: You do not have to shut

Troubleshooting Display Setting Restoration/Save the EEPROM Information - 7 the old EEPROM, you must quit MacTest Pro and shut down the computer to

Troubleshooting Display Setting Restoration/Restore the EEPROM Information - After the new microprocessor board is installed, the new EEPROM will h

Basics Version Differences - 2 Version Differences Overview The Apple Multiple Scan 20 Display and Apple Multiple Scan 20 Display Rev. B have the sa

Troubleshooting Display Setting Restoration - 9 Caution: Make certain that you are aware of the following important information about the EEPROM d

Troubleshooting Symptom Charts/Raster - 10 Symptom Charts Raster No raster; power indicator light on1 Ensure monitor’s video cable is properly conne

Troubleshooting Symptom Charts/Raster (Continued) - 11 Raster (Continued) Raster jumps Replace microprocessor board after downloading settings as

Troubleshooting Symptom Charts/Raster (Continued) - 12 Raster (Continued) Raster distorted; no picture1 Replace microprocessor board after downlo

Troubleshooting Symptom Charts/Power - 13 Power Monitor does not power up1 Ensure monitor’s video cable is properly connected to computer or video c

Troubleshooting Symptom Charts/Indicator Lights - 14 Indicator Lights Convergence indicator light blinks or stays on; power indicator light might al

Troubleshooting Symptom Charts/Indicator Lights (Continued) - 15 Indicator Lights (Continued) Rotation indicator light blinks or stays on; power

Troubleshooting Symptom Charts/Indicator Lights (Continued) - 16 Indicator Lights (Continued) Size indicator light blinks or stays on; power indi

Troubleshooting Symptom Charts/Indicator Lights (Continued) - 17 Indicator Lights (Continued) Centering indicator light blinks or stays on; power

Troubleshooting Symptom Charts/Miscellaneous - 18 Miscellaneous Picture dim; adjusting front panel controls does not increase brightness1 Ensure tha

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

Troubleshooting Symptom Charts/Miscellaneous (Continued) - 19 Miscellaneous (Continued) Monitor emits snapping sound; raster blinks for an instan

Troubleshooting Symptom Charts/Miscellaneous (Continued) - 20 Miscellaneous (Continued) Upon first use, monitor screen shows cloth-like pattern o

Service Source K Take Apart Apple Multiple Scan 20 Display

Take Apart Rear Cover - 1 Rear Cover No preliminary steps are required before you begin this procedure. ± Warning: This product contains high volt

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 Ro

Take Apart Bezel - 3 Bezel Before you begin, remove the following:• Rear cover• EMI shield ± Warning: This product contains high voltage and a hig

Take Apart Bezel - 4 1 Remove the grounding screw.Grounding Screw

Take Apart Bezel - 5 2 Remove the four large hex head screws and remove the bezel.Hex Head ScrewBezel

Take Apart EMI Shield - 6 EMI Shield Before you begin,• Remove the rear cover• Discharge the CRT ± Warning: This product contains high voltage and

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

Basics Monitor Distortion - 4 Monitor Distortion Overview All large-screen monitors are susceptible to distortions caused by environmental condition

Take Apart EMI Shield - 8 2 Slide the shield toward the back of the monitor and lift off the shield.EMI Shield

Take Apart CRT/Video Board - 9 CRT/Video Board Before you begin,• Remove the rear cover• Discharge the CRT• Remove the EMI shield ± Warning: This

Take Apart CRT/Video Board - 10 ± Warning: Never use a grounding wriststrap until after discharging the CRT.1 Caution: When removing the ground

Take Apart CRT/Video Board - 11 Caution: When disconnecting the following cables from the CRT/video board, be careful not to apply excessive press

Take Apart CRT/Video Board - 12 Caution: When disconnecting the following cables from the CRT/video board, be careful not to apply excessive press

Take Apart CRT/Video Board - 13 Caution: When removing the video cable from the CRT/video board, be careful not to apply excessive pressure to the

Take Apart CRT/Video Board - 14 Caution: Twisting, bending, or applying force to the CRT/video board could damage the neck of the CRT. Be sure to

Take Apart CRT/Video Board - 15 7 Remove the two plastic cable clips on the focus VR control cables.8 Disconnect the FV1 and FV2 cables from the foc

Take Apart Power Supply - 16 Power Supply Before you begin,• Remove the rear cover• Discharge the CRT• Remove the EMI shield ± Warning: This produ

Take Apart Power Supply - 17 1 Disconnect these cables from the power supply:• 8-wire cable (CN602)•5-wire cable (CN603)• 2-wire cable (CN604)• Grou

Basics Monitor Distortion - 5Ideal RasterRaster Shifted Up and LeftRaster Shifted Up and Right

Take Apart Power Supply - 18 3 Disconnect these cables from the AC interconnect board:• CN1600• CN16014 Remove plastic cable clips.CN1601CN1600Plast

Take Apart Power Supply - 19 5 Remove the screw securing the ground strap to the chassis.6 Remove the screw securing the power supply to the chassis

Take Apart Power Supply - 20 8 Disconnect connector CN601.CN601

Take Apart Fuse - 21 Fuse Before you begin,• Remove the rear cover• Discharge the CRT• Remove the EMI shield• Remove the power supply ± Warning: T

Take Apart Fuse - 22 ± Warning: Never use a grounding wriststrap until after discharging the CRT.1 Remove the plastic cover from the fuse holder.2

Take Apart Focus VR Control - 23 Focus VR Control Before you begin,• Remove the rear cover• Discharge the CRT• Remove the EMI shield ± Warning: Th

Take Apart Focus VR Control - 24 ± Warning: Never use a grounding wriststrap until after discharging the CRT.1 Disconnect these cables from the fo

Take Apart Focus VR Control - 25 2 Remove the screw securing the ground strap to the chassis.3 Remove the screw securing the focus control to the ch

Take Apart AC Inlet Assembly - 26 AC Inlet Assembly Before you begin,• Remove the rear cover• Discharge the CRT• Remove the EMI shield• Remove the p

Take Apart AC Inlet Assembly - 27 ± Warning: Never use a grounding wriststrap until after discharging the CRT.1 Disconnect these cables from the A

Basics Monitor Distortion - 6 Environmental Influences The following environmental conditions may distort the raster:• Proximity to metal objects, su

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.ScrewScrewA

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 ± Warning: Th

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)

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 fr

Take Apart Video Cable - 32 Video Cable Before you begin,• Remove the rear cover• Discharge the CRT• Remove the EMI shield ± Warning: This product

Take Apart Video Cable - 331 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

Take Apart Video Cable - 343 Caution: When removing the video cable from the CRT/video board, be careful not to apply excessive pressure to the neck

Take Apart Video Cable - 355 Remove the two screws securing the rear panel to the chassis.6 Rotate the rear panel away from the chassis.7 Remove the

Take Apart Video Cable - 368 Remove the two screws securing the cable clamp to the rear panel.9 Remove the video cable.Screw Screw

Take Apart Main Deflection Board - 37Main Deflection BoardBefore you begin,• Remove the rear cover• Discharge the CRT• Remove the EMI shield• Remove

Basics - 7Right Edge Not Straight Left Side Bowed Out Right Side Bowed In

Take Apart Main Deflection Board - 381 Disconnect the MV cable from the focus VR control.2 Remove the two plastic cable clips on the focus VR control

Take Apart Main Deflection Board - 396 Disconnect these cables from the serial I/O board:• CN250• CN253 (from video cable)• CN254 (from CRT/video boa

Take Apart Main Deflection Board - 407 Caution: When disconnecting the following cables from the CRT/video board, be careful not to apply excessive

Take Apart Main Deflection Board - 418 Caution: When removing the video cable from the CRT/video board, be careful not to apply excessive pressure

Take Apart Main Deflection Board - 429 Disconnect these cables from the main deflection board:• 2-wire cable (CN401)• 2-wire cable (CN502)• 2-wire ca

Take Apart Main Deflection Board - 43• 6-wire cable (CN501)• gold-colored connector• 6-pin connector (control panel)

Take Apart Main Deflection Board - 4410 Remove the cables from the plastic cable clip.

Take Apart Main Deflection Board - 4511 Remove the two screws securing the main deflection board carrier to the chassis. (Only one screw is shown in

Take Apart Microprocessor Board - 46Microprocessor BoardBefore you begin,• Save EEPROM settings• Remove the rear cover• Discharge the CRT• Remove the

Take Apart Microprocessor Board - 47±Warning: This product contains high voltage and a high-vacuum picture tube. To prevent serious injury, review C

Basics - 8 Troubleshooting Important: Exchanging the monitor cannot correct environmental distortion problems. Note: If the monitor has shifted

Take Apart Microprocessor Board - 48Important: Make sure you save the EEPROM settings before replacing the microprocessor board. 1 Disconnect these

Take Apart Tilt/Swivel Assembly - 49Tilt/Swivel AssemblyBefore you begin,• Remove the rear cover• Discharge the CRT• Remove the EMI shield• Remove th

Take Apart Tilt/Swivel Assembly - 50±Warning: Never use a grounding wriststrap until after discharging the CRT.1 With the monitor face-down on a pro

Take Apart Control Panel - 51Control PanelBefore you begin,• Remove the cover• Discharge the CRT• Remove the anode cap• Remove the EMI shield• Remove

Take Apart Control Panel - 52±Warning: This product contains high voltage and a high-vacuum picture tube. To prevent serious injury, review CRT safe

Take Apart Control Panel - 531 Remove the screw securing the control panel ground strap to the chassis.2 Remove the ground wire from the plastic cabl

Take Apart ADB Board - 54ADB BoardNo preliminary steps are required before you begin this procedure.ADB Board

Take Apart ADB Board - 551 With the monitor face-down on a protective pad, remove the two screws securing the ADB board cover and remove the cover.2

Service Source K Adjustments Apple Multiple Scan 20 Display

Adjustments Brightness and Contrast - 1 Brightness and Contrast No preliminary steps are required before you begin this procedure.Adjustment contro