Apple 20 - Manuals

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 distort...

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...

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...

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...

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 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 ...

Specifications Characteristics - 2 Video 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 posi...

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 vertic...

Specifications Physical and Electrical - 4 Physical and Electrical Power 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 Weight Height: 18.5 in. (474 mm) Width: 18.5 in. (474 mm) D...

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)

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 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, noncondens...

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 exhi...

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 Mult...

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, sa...

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, th...

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 describe...

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...

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 dat...

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. P...

Service Source K Take Apart Apple Multiple Scan 20 Display

Service Source K Adjustments Apple Multiple Scan 20 Display

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

Adjustments Geometry - 5 Vertical 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

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

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 brightness controls to increase or decrease the size of the picture. Crosshatch Brightness Controls Select Button Size Indicator Light

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

Adjustments Geometry - 11 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 I...

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. Front Panel

Adjustments Convergence - 13 Vertical Convergence 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 si...

Adjustments Color Temperature - 15 Color Temperature No preliminary 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: ...

Adjustments Factory Settings - 19 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 i...

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. Reset Button

Adjustments Factory Settings - 22 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

Service Source K Exploded View Apple Multiple Scan 20 Display