Apple Highres Monochrome Monitor Service Manual

0 (0)
K
Service Source
Apple High-Res
Monochrome Monitor
K
Service Source
Specifications
Apple High-Resolution
Specifications Characteristics - 1

Characteristics

Picture Tube

Screen Resolution

Scan Rates

Active V ideo Display Area

12-in. diagonal screen Phosphor EIA Type P4 (white) Flat, high-contrast, antiglare surface
640x480; 76 dpi
Vertical refresh rate: 66.7 Hz Horizontal scan rate: 35.0 kHz
8.38 in. by 6.3 in. (213 mm by 160 mm)
Specifications Characteristics - 2

Input Signal

Video: analog; RS-343 standard
Specifications Controls - 3

Controls

User Controls

Rear panel: power switch Right side: brightness and contrast controls
Specifications Physical and Electrical - 4

Physical and Electrical

Power Supply

Size and Weight

Universal power supply Voltage: 85–270 VAC Frequency: 50–60 Hz Power: 40 W maximum
Height: 10 in. (254 mm) Width: 12.2 in. (310 mm) Depth: 14.4 in. (365 mm) Weight: 17 lb. (7.7 kg)
Specifications Operating Environment - 5

Operating Environment

Temperature

Humidity

Altitude

50°C–l04°F (l0°C–40°C)
90% maximum, noncondensing
10,000 ft. (3,048 m) maximum
K
Service Source

Troubleshooting

Apple High-Resolution
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.)
If you are not sure what the problem is, or if the Symptom Charts do not resolve the problem, refer to the Flowchart for the product family.
For additional assistance, contact Apple Technical Support.
Troubleshooting Symptom Charts/No Raster - 2

Symptom Charts

No Raster

No raster, LED off 1 Ensure monitor’s video cable is connected to the computer or
the video card in the computer. 2 Verify that power cord is connected. 3 Check internal power connectors. 4 Replace fuse. 5 Replace power supply. 6 Replace power switch.
No raster, LED on 1 Ensure monitor’s video cable is connected to the computer or
the video card in the computer. 2 Adjust brightness and contrast knobs. 3 Replace video card (if present) in computer. 4 Adjust sub-brightness (cutoff) control. 5 Check logic board connection to power supply. 6 Replace fuse. 7 Replace main board. 8 Replace power supply. 9 Replace power switch assembly. 10 Replace video board C. 11 Replace contrast control board.
Troubleshooting Symptom Charts/Geometry - 3

Geometry

Raster stretched or compressed on side or top of screen
1 Verify that distortion is not due to environmental conditions. 2 Perform appropriate geometric adjustments. 3 Replace main board. 4 Replace CRT.
Troubleshooting Symptom Charts/Synchronization - 4

Synchronization

Picture breaks into diagonal lines
Picture rolls vertically
One horizontal or vertical line appears on screen
1 Connect another monitor to computer and verify presence of
video signal. 2 Replace main board.
1 Verify that video card in computer is working properly. 2 Adjust vertical hold. 3 Check connector on I/O connector board. 4 Replace main board.
1 Check yoke connectors. 2 Replace main board. 3 Replace CRT.
Troubleshooting Symptom Charts/Video - 5

Video

Picture too dark or too bright
Brightness unadjustable
Out of focus 1 Perform focus adjustments.
1 Adjust brightness knob. 2 Verify that video card in computer is working properly. 3 Adjust sub-brightness (cutoff) control. 4 Replace main board. 5 Replace video board C. 6 Replace CRT.
1 Replace contrast control board. 2 Replace main board. 3 Replace video board C. 4 Replace CRT.
2 Replace main board. 3 Replace video board C. 4 Replace CRT.
Troubleshooting Symptom Charts/Miscellaneous - 6

Miscellaneous

Picture jitters 1 Check grounding cable connections to chassis.
2 Confirm that adjacent computer equipment is properly
grounded. Move electrical devices away from monitor.
Temporarily shut off fluorescent lights in area. 3 Replace main board.
Flashing lines on screen
Black spots on screen (burnt phosphors)
1 Confirm contact of video connector to neck of CRT. 2 Replace contrast control board. 3 Replace main board.
Replace CRT.
K
Service Source

T ak e Apart

Apple High-Resolution
Take Apart Rear Cover - 1

Rear Cover

No preliminary steps are required before you begin this procedure.
Remove the four case screws and lift off the rear cover.
Take Apart Main Board - 2

Main Board

Before you begin:
• Remove the rear cover
• Discharge the CRT
±
Main Board
Warning:
contains high voltage and a high-vacuum picture tube. To prevent serious injury, review CRT safety in Bulletins/Safety.
±
Warning:
grounding wriststrap until after discharging the CRT.
This product
Never use a
Take Apart Main Board - 3
1 Remove the four screws
that fasten the main board to the chassis.
Take Apart Main Board - 4
2 Remove the anode wire
from the cable clamp.
Take Apart Main Board - 5
Note:
Connectors D2, D4, D5, and D9 fit tightly and are difficult to reach, so pull the main board away from the chassis before you try to remove these connectors.
3 Remove the following
cable connectors from the main board:
• D7 (large 3-pin connector)
• D8 (large 4-pin connector)
• D6 (large 6-pin connector)
Take Apart Main Board - 6
• D9 (2-pin connector)
• D2 (5-pin connector)
• D5 (2-pin connector)
• D4 (4-pin connector)
Take Apart Main Board - 7
4 Lift the main board
from the chassis.
Loading...
+ 51 hidden pages