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K
Service Source
Apple Multiple Scan 20
Display
Apple Multiple Scan 20 Display
Apple Multiple Scan 20 Display, Rev. B
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K Service Source Basics Apple Multiple Scan 20 Display
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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. B version ends in one of the following: • 5B4 • 5J2 • 5JE • 5JF
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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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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. Always check first for environmental causes before attempting to
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Basics Monitor Distortion - 5 Ideal Raster Raster Shifted Up Raster Shifted Up and Left and Right
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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 jit
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Basics - 7 Right Edge Not Straight Left Side Bowed Out Right Side Bowed In
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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
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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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Basics - 10 Upper-Right Corner Rounded Left Edge S-Shaped Raster Tilted Right
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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.
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Basics EEPROM Settings - 12 Microprocessor Board
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K Service Source Specifications Apple Multiple Scan 20 Display
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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 Display, Rev. B Scan Rates Vertical refresh range: 50 to 150 Hz Horizontal scan range: 29 to 82 kHz Macintosh, VGA, SVGA, and VESA compatible Cable Connector 15-pin miniature D-type
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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 positive going Composite Sync: 1 to 5 V peak to peak; negative or positive going System Power Macintosh, Macintosh Centris, Macintosh Quadra, or any Requirements NuBus compatible Macintosh with
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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 degauss at power on; manual degauss by turning power switch off, then on (capable of full degauss after monitor is turned off for 20 minut
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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) Depth: 19.6 in. (501.5 mm) Monitor weight: 66 lb. (30 kg) Fully boxed weight: 80 lb. (36 kg)
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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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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, noncondensing Storage: 5-90% maximum, noncondensing Shipping: 5-95% maximum, noncondensing Power Savings Conforms to the Energy Star Program of the United States Feature Environmental Protection Ag
