K Service Source Apple Multiple Scan 20 Display Apple Multiple Scan 20 Display Apple Multiple Scan 20 Display, Rev.
K Service Source Basics Apple Multiple Scan 20 Display
Basics Version Differences - 2 Version Differences Overview 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 serial number for the Rev.
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.
Basics Monitor Distortion - 4 Monitor Distortion Overview 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 environmentally caused distortions are shown on this and the following cards.
Basics Monitor Distortion - 5 Ideal Raster Raster Shifted Up and Left Raster Shifted Up and Right
Basics Monitor Distortion - 6 Environmental 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 monitors, or electronic appliances such as coffee makers and copy machines. These objects cause dynamic raster distortion, that is, movement or jitter of the image.
Basics - 7 Right Edge Not Straight Left Side Bowed Out Right Side Bowed In
Basics - 8 Troubleshooting 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 monitor with a distorted raster, try the following: • Swivel or move the monitor, or • Remove the monitor from the building and recheck it in another location.
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 distortioncausing object. If the display does not change when you move it to another location, continue troubleshooting the problem (refer to Troubleshooting).
Basics - 10 Upper-Right Corner Rounded Left Edge S-Shaped Raster Tilted Right
Basics EEPROM Settings - 11 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 before they can be written to the new EEPROM, the display will be impossible to repair, and the whole display will need to be replaced.
Basics EEPROM Settings - 12 Microprocessor Board
K Service Source Specifications Apple Multiple Scan 20 Display
Specifications Characteristics - 1 Characteristics Picture Tube Screen Resolution Scan Rates Cable Connector 20-in. diagonal Trinitron CRT (19.1-in. viewable image) Multiple scan Bonded glass panel with antiglare/antistatic multilayer coating 640x480 to 1280x1024 0.31-mm stripe pitch 0.26-mm stripe pitch for Multiple Scan 20 Display, Rev.
Specifications Video Input Signals System Requirements Characteristics - 2 Video: red, green, and blue analog signals; RS-343A standard;.714 V peak to peak; positive going Sync on green: RS-343A compatible level;.
Specifications Controls and Ports - 3 Controls and Ports User Controls I/O Ports 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 degauss at power on; manual degauss by turning power switch off, then on (capable of full degauss after monitor is turned off for 20 minutes or more)
Specifications Physical and Electrical - 4 Physical and Electrical Power Supply Size and Weight 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) Height: 18.5 in. (474 mm) Width: 18.5 in. (474 mm) Depth: 19.6 in. (501.5 mm) Monitor weight: 66 lb. (30 kg) Fully boxed weight: 80 lb.
Specifications Monitor Stand Physical and Electrical - 5 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)
Specifications Environmental - 6 Environmental Temperature Altitude Humidity Power Savings Feature 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) Operating: to 10,000 ft. (1,067 m) Shipping: to 35,000 ft.
K Service Source 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. 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 next cure. (Note: If you have replaced a module, reinstall the original module before you proceed to the next cure.
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 all Macintosh computers and PowerBooks.
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 screen movement can be caused by external interference such as electronic devices and fluorescent lights.
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 possibility of other defective modules, and accepting small imperfections in screen display.
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 Display Setting Restore Utility to preserve the monitor adjustment settings.
Troubleshooting Display Setting Restoration - 6 must be turned off). Also connect a power cable to the display. Advantage: You do not have to shut down the host computer or quit MacTest Pro to complete the repair. Disadvantage: This method requires a separate host computer (with display). 2 Connect the display as usual, using a video cable and power cable. Also, connect a serial cable (MINI DIN-8) between the display and either the modem or printer port on the computer.
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 2 3 4 Start MacTest Pro. Choose “Apple Multiple Scan 20 Display.” Select “Test.” Click “Create File.” Install the Microprocessor Board See Take Apart for instructions on installing the new microprocessor board.
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 temperature mode chosen restored. Restore the EEPROM Information To download the saved adjustment information to the new EEPROM, 1 2 3 4 Start MacTest Pro.
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 display is unique, so writing the wrong data to a display may cause severe adjustment problems.
Troubleshooting Symptom Charts/Raster - 10 Symptom Charts Raster No raster; power indicator light on 1 2 3 Ensure monitor’s video cable is properly connected to computer or video card in the computer. Replace main deflection board. 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.
Troubleshooting Symptom Charts/Raster (Continued) - 11 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 color blotches when displaying an allwhite screen 1 2 Degauss monitor with an external degaussing coil.
Troubleshooting Symptom Charts/Raster (Continued) - 12 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 Replace main deflection board.
Troubleshooting Symptom Charts/Power - 13 Power Monitor does not power up 1 2 Monitor shuts down 1 2 3 Ensure monitor’s video cable is properly connected to computer or video card in the computer, and check other cable connections. Replace power supply. Ensure monitor’s video cable is properly connected to computer or video card in the computer. Replace main deflection board. Replace CRT/video board.
Troubleshooting Symptom Charts/Indicator Lights - 14 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 settings before you replace the microprocessor board.
Troubleshooting Symptom Charts/Indicator Lights (Continued) - 15 Indicator Lights (Continued) Rotation indicator light blinks or stays on; power indicator light might also blink Replace main deflection board.
Troubleshooting Symptom Charts/Indicator Lights (Continued) - 16 Indicator Lights (Continued) Size indicator light blinks or stays on; power indicator light might also blink 1 2 3 Replace main deflection board. Replace CRT/video board. 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.
Troubleshooting Symptom Charts/Indicator Lights (Continued) - 17 Indicator Lights (Continued) Centering indicator light blinks or stays on; power indicator light might also blink 1 2 Replace main deflection board. 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.
Troubleshooting Symptom Charts/Miscellaneous - 18 Miscellaneous Picture dim; adjusting front panel controls does not increase brightness 1 Picture has vertical jitter 1 2 Ensure that screen does not face a window or other source of ambient light. This type of environment gives screen a dim appearance. Replace CRT/video board. Move monitor to different location and see if symptom persists.
Troubleshooting Symptom Charts/Miscellaneous (Continued) - 19 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 supply. 2 Check to see if arcing on main deflection board is cause. If so, replace main deflection board. If not, CRT is defective.
Troubleshooting Symptom Charts/Miscellaneous (Continued) - 20 Miscellaneous (Continued) Upon first use, monitor screen shows cloth-like pattern of black, dark gray, or white fine vertical lines 1 2 3 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 while minimizing discoloration. At power-on, lightly tap the side of the monitor so you see the display image move.
K Service Source 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 voltage and a high-vacuum picture tube. To prevent serious injury, review CRT safety in Bulletins/Safety.
Take Apart Rear Cover - 2 1 Video Cable 2 With the monitor facedown on a protective pad, remove the four case screws and pull the rear cover off the chassis. Route the video cable through the cover.
Take Apart Bezel - 3 Bezel Bezel Before you begin, remove the following: • Rear cover • EMI shield This product contains high voltage and a high-vacuum picture tube. To prevent serious injury, review CRT safety in Bulletins/Safety.
Take Apart Bezel - 4 1 Grounding Screw Remove the grounding screw.
Take Apart Bezel - 5 Bezel Hex Head Screw 2 Remove the four large hex head screws and remove the bezel.
Take Apart EMI Shield - 6 EMI Shield EMI Shield Before you begin, • Remove the rear cover • Discharge the CRT Warning: This product contains high voltage and a high-vacuum picture tube. To prevent serious injury, review CRT safety in Bulletins/Safety. ± Never use a grounding wriststrap until after discharging the CRT. ±Warning: Note: The EMI shield is not replaceable.
Take Apart EMI Shield - 7 1 EMI Shield Remove the 12 screws from the shield. (Three screws are located on the left side of the EMI shield.
Take Apart EMI Shield EMI Shield - 8 2 Slide the shield toward the back of the monitor and lift off the shield.
Take Apart CRT/Video Board - 9 CRT/Video Board CRT/Video Board Before you begin, • Remove the rear cover • Discharge the CRT • Remove the EMI shield This product contains high voltage and a high-vacuum picture tube. To prevent serious injury, review CRT safety in Bulletins/Safety.
Take Apart CRT/Video Board - 10 Never use a grounding wriststrap until after discharging the CRT. ±Warning: NTC Connector 1 2 Ground Strap 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. Disconnect the NTC connector.
Take Apart R,G,B Cables CN302 CN301 CN303 CRT/Video Board - 11 Caution: When disconnecting the following cables from the CRT/video board, be careful not to apply excessive pressure to the neck of the CRT.
Take Apart CRT/Video Board - 12 CN304 Caution: When disconnecting the following cables from the CRT/video board, be careful not to apply excessive pressure to the neck of the CRT.
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 neck of the CRT. 5 Video Cable Clip Remove the screw securing the video cable clip to the CRT/video board shield.
Take Apart CRT/Video Board - 14 CRT/Video Board 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 Mounting Screw Loosen the mounting screw and pull the CRT/ video board straight off the neck of the CRT.
Take Apart CRT/Video Board - 15 7 8 FV1 Cable FV2 Cable Plastic Cable Clip Remove the two plastic cable clips on the focus VR control cables. Disconnect the FV1 and FV2 cables from the focus control board.
Take Apart Power Supply - 16 Power Supply Before you begin, • Remove the rear cover • Discharge the CRT • Remove the EMI shield This product contains high voltage and a high-vacuum picture tube. To prevent serious injury, review CRT safety in Bulletins/Safety. ±Warning: Never use a grounding wriststrap until after discharging the CRT.
Take Apart Power Supply - 17 1 CN604 CN602 Ground Strap CN603 2 Disconnect these cables from the power supply: • 8-wire cable (CN602) • 5 - w i re cable (CN603) • 2-wire cable (CN604) • Ground strap Remove the wiring harness from the plastic cable clip.
Take Apart Power Supply - 18 3 4 CN1601 CN1600 Plastic Cable Clips Disconnect these cables from the AC interconnect board: • CN1600 • CN1601 Remove plastic cable clips.
Take Apart Power Supply - 19 5 6 Screw Ground Strap Screw 7 Remove the screw securing the ground strap to the chassis. Remove the screw securing the power supply to the chassis. Slide the power supply toward the rear of the monitor and lift out the power supply.
Take Apart Power Supply - 20 8 CN601 Disconnect connector 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: This product contains high voltage and a high-vacuum picture tube. To prevent serious injury, review CRT safety in Bulletins/Safety.
Take Apart Fuse - 22 Never use a grounding wriststrap until after discharging the CRT. ±Warning: 1 2 Fuse Holder Remove the plastic cover from the fuse holder. 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.
Take Apart Focus VR Control - 23 Focus VR Control Before you begin, • Remove the rear cover • Discharge the CRT • Remove the EMI shield This product contains high voltage and a high-vacuum picture tube. To prevent serious injury, review CRT safety in Bulletins/Safety.
Take Apart Focus VR Control - 24 Never use a grounding wriststrap until after discharging the CRT.
Take Apart Focus VR Control - 25 2 3 Focus Control 4 Focus Control Screw Ground Strap Screw Remove the screw securing the ground strap to the chassis. Remove the screw securing the focus control to the chassis. Lift out the focus control.
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 power supply This product contains high voltage and a high-vacuum picture tube. To prevent serious injury, review CRT safety in Bulletins/Safety.
Take Apart AC Inlet Assembly - 27 Never use a grounding wriststrap until after discharging the CRT. ±Warning: 1 CN1601 2 CN1600 Screw Disconnect these cables from the AC interconnect board: • CN1600 • CN1601 Remove the screw securing the AC inlet ground strap to the chassis.
Take Apart AC Inlet Assembly - 28 3 4 Screw Screw AC Inlet Assembly Remove the two screws securing the AC inlet assembly to the chassis. Lift out the AC inlet assembly.
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 This product contains high voltage and a high-vacuum picture tube. To prevent serious injury, review CRT safety in Bulletins/Safety. ±Warning: Warning: Never use a grounding wriststrap until after discharging the CRT.
Take Apart Serial I/O Board - 30 1 Serial I/O Board CN253 CN254 CN250 Screw Screw 2 3 Disconnect these cables from the serial I/O board: • CN250 • CN253 (from video cable) • CN254 (from CRT/ video board) Remove the two screws securing the serial I/O board to the rear panel. Lift out the serial I/O 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 from the CRT/video board connects to connector CN254.
Take Apart Video Cable - 32 Video Cable Before you begin, • Remove the rear cover • Discharge the CRT • Remove the EMI shield This product contains high voltage and a high-vacuum picture tube. To prevent serious injury, review CRT safety in Bulletins/Safety. ±Warning: Warning: Never use a grounding wriststrap until after discharging the CRT.
Take Apart Video Cable - 33 1 2 R,G,B Cables CN253 Serial I/O Board Disconnect connector CN253 from the serial I/O board. Disconnect the R, G, and B cables from the CRT/ video board.
Take Apart Video Cable - 34 3 Video Cable Clip 4 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. Remove the plastic cable clip.
Take Apart Video Cable - 35 5 6 7 Rear Panel Remove the two screws securing the rear panel to the chassis. Rotate the rear panel away from the chassis. Remove the rear panel from the chassis.
Take Apart Video Cable - 36 8 9 Screw Screw Remove the two screws securing the cable clamp to the rear panel. Remove the video cable.
Take Apart Main Deflection Board - 37 Main Deflection Board Before you begin, • Remove the rear cover • Discharge the CRT • Remove the EMI shield • Remove the power supply This product contains high voltage and a high-vacuum picture tube. To prevent serious injury, review CRT safety in Bulletins/Safety.
Take Apart Main Deflection Board - 38 1 2 Plastic Clip MV Cable 3 4 5 Plastic Clip Disconnect the MV cable from the focus VR control. Remove the two plastic cable clips on the focus VR control cables. Remove the screw securing the ground strap to the chassis. Remove the screw securing the focus control to the chassis. Lift out the focus control and let it hang outside the chassis.
Take Apart Main Deflection Board - 39 6 CN253 CN254 CN250 Serial I/O Board 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.
Take Apart Main Deflection Board - 40 7 R,G,B Cables Disconnect these cables from the CRT/video board: • 11-wire cable (CN302) • 7-wire cable (CN303) • R, G, and B video cables CN302 CN303 Caution: When disconnecting the following cables from the CRT/video board, be careful not to apply excessive pressure to the neck of the CRT.
Take Apart Main Deflection Board - 41 8 Video Cable Clip 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.
Take Apart Main Deflection Board - 42 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)
Take Apart Main Deflection Board - 43 • 6-wire cable (CN501) • gold-colored connector • 6-pin connector (control panel)
Take Apart Main Deflection Board - 44 10 Remove the cables from the plastic cable clip.
Take Apart Main Deflection Board - 45 11 Remove the two screws securing the main deflection 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. 13 Remove the main deflection board.
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 Microprocessor Board Important: Before you replace the microprocessor board, save the EEPROM settings. See Troubleshooting for instructions.
Take Apart Microprocessor Board - 47 This product contains high voltage and a high-vacuum picture tube. To prevent serious injury, review CRT safety in Bulletins/Safety. ±Warning: Never use a grounding wriststrap until after discharging the CRT.
Take Apart Microprocessor Board - 48 CN908 Important: Make sure you save the EEPROM settings before replacing the microprocessor board. 1 CN902 CN901 CN907 2 Disconnect these cables from the microprocessor board: • 11-wire cable (CN901) • 7-wire cable (CN902) • 6-wire cable (CN907) • 5-wire cable (CN908) Remove the microprocessor board.
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 This product contains high voltage and a high-vacuum picture tube. To prevent serious injury, review CRT safety in Bulletins/Safety.
Take Apart Tilt/Swivel Assembly - 50 Never use a grounding wriststrap until after discharging the CRT. ±Warning: 1 Screw 2 With the monitor facedown 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 assembly.) Lift and remove the tilt/ swivel assembly.
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
Take Apart Control Panel - 52 This product contains high voltage and a high-vacuum picture tube. To prevent serious injury, review CRT safety in Bulletins/Safety. ±Warning: Never use a grounding wriststrap until after discharging the CRT.
Take Apart Control Panel - 53 1 2 Grounding Strap 3 4 Plastic Cable Clip Control Panel Remove the screw securing the control panel ground strap to the chassis. Remove the ground wire from the plastic cable clip. Remove the two screws securing the control panel board support to the front bezel. Lift out the control panel board and support.
Take Apart ADB Board - 54 ADB Board No preliminary steps are required before you begin this procedure.
Take Apart ADB Board - 55 1 2 With the monitor facedown on a protective pad, remove the two screws securing the ADB board cover and remove the cover. Lift out the ADB board.
K Service Source 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 controls are located on the front panel.
Adjustments Brightness and Contrast - 2 Brightness 1 2 Brightness Controls Press the + button to increase the brightness. Press the – button to decrease the brightness.
Adjustments Brightness and Contrast - 3 Contrast 1 2 Contrast Controls Press the + button to increase the contrast. Press the – button to decrease the contrast.
Adjustments Geometry - 4 Geometry No preliminary steps are required before you begin this procedure. Adjustment controls are located on the front panel.
Adjustments Geometry - 5 Vertical Center Crosshatch 1 2 Centering Indicator Light Select Button Brightness Controls Press the select button to turn on the centering indicator light. Press the + or – button on the brightness controls to move the center of the picture up or down.
Adjustments Geometry - 6 Horizontal Center Crosshatch 1 2 Centering Indicator Light Select Button Contrast Controls Press the select button to turn on the centering indicator light. Press the + or – button on the contrast controls to move the center of the picture right or left.
Adjustments Geometry - 7 Vertical Size Crosshatch 1 2 Brightness Controls Size Indicator Light Select Button Press the select button repeatedly until the size indicator light goes on. Press the + or – button on the brightness controls to increase or decrease the size of the picture.
Adjustments Geometry - 8 Horizontal Size Crosshatch 1 2 Size Indicator Light Select Button Contrast Controls Press the select button repeatedly until the size indicator light goes on. Press the + or – button on the contrast controls to increase or decrease the size of the picture.
Adjustments Geometry - 9 Rotation and Color Uniformity Crosshatch 1 2 Rotation Indicator Light Brightness Controls Select Button 3 Press the select button repeatedly until the rotation indicator light goes on. Press the + button on the brightness controls to tilt the picture clockwise. Press the – button on the brightness controls to tilt the picture counterclockwise.
Adjustments Geometry - 10 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 all four corners of the picture have consistent color.
Adjustments Geometry - 11 Shape Crosshatch 1 2 3 Rotation Indicator Light Select Button Contrast Controls Press the select button repeatedly until the rotation indicator light goes on. Press the + button on the contrast controls to expand the sides of the picture. Press the – button on the contrast controls to bring in the sides of the picture.
Adjustments Convergence - 12 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.
Adjustments Convergence - 13 Vertical Convergence Crosshatch 1 2 Convergence Indicator Light Brightness Controls Select Button 3 Press the select button repeatedly until the convergence indicator light goes on. Press the + button on the brightness controls to move the red signal up and the blue signal down. Press the – button on the brightness controls to move the red signal down and the blue signal up.
Adjustments Convergence - 14 Horizontal Convergence Crosshatch 1 2 Convergence Indicator Light 3 Select Button Contrast Controls Press the select button repeatedly until the convergence indicator light goes on. Press the + button on the contrast controls to move the red signal to the right and the blue signal to the left. Press the – button on the contrast controls to move the red signal to the left and the blue signal to the right.
Adjustments Color Temperature - 15 Color Temperature No preliminary steps are required before you begin this procedure. Front Panel Color temperature refers to the intensity of the red/ green/blue signals sent to the monitor.
Adjustments Color Temperature - 16 Color temperature can be changed to accommodate preference or application specifications. Adjustment controls are located on the front panel.
Adjustments Color Temperature - 17 1 Color Temperature Indicator Light Select Button Contrast Controls 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.
Adjustments Color Temperature - 18 2 3 Color Temperature Indicator Light Select Button Contrast Controls Press the + button on the contrast controls to increase the color temperature. Press the – button on the contrast controls to decrease the color temperature.
Adjustments Factory Settings - 19 Factory Settings No preliminary steps are required before you begin this procedure. Front Panel 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 factory settings.
Adjustments Factory Settings - 20 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.
Adjustments Factory Settings - 21 Reset a Specific Control 1 Picture Control Indicator Lights Reset Button Select Button 2 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. Use a straightened paper clip to push in the reset button. The selected picture control is reset to its original level.
Adjustments Factory Settings - 22 Reset All Controls While holding down the control button, push in the reset button with a straightened paper clip. Control Button Reset Button All picture controls are reset to their factory levels.
K Service Source Exploded View Apple Multiple Scan 20 Display
Exploded View 1 922-0730 Bezel 922-0733 Focus VR Control CRT Assembly (not offered) 922-0685 922-1570 (Rev B) Microprocessor Control Board 661-0507 CRT Video Board 922-0737 Panel Support with Buttons 922-0684 Control Panel 661-0996 (Rev B) 661-0506 Main Deflection Board 922-0686 Serial I/O Board 922-0734 Rear Connector Panel 922-0696 AC Inlet Assembly 661-0508 661-1007 (Rev B) Power Supply Assembly 922-0697 Tilt/Swivel Assembly 922-0732 Video Cable 922-0687 ADB Board ADB Board Cover EMI Shield (No
