HP 8753E - Page 12

Remove the Assemblies ................... 5-15
Briefly Disable the Shutdown Circuitry ............ 5-16
Inspect the Motherboard ................... 5-18
Error Messages
Check the Fuses and Isolate .A8 . 1 : 1 . 1 1 1 : 1 : 1 1 1 : 1
5-19
5-20
Pan Troubleshooting ......................
5-22
Fan Speeds .........................
5-22
Check the Pan Voltages ....................
5-22
Short ABTP3 to Ground ...................
5-22
Intermittent Problems .....................
5-23
6. Digital Control Troubleshooting
Digital Control Group Block Diagram ......
Assembly Replacement Sequence ........
CPU Troubleshooting (A9) ...........
A9 CC Switch Positions ............
Checking A9 CPU Red LED Patterns .....
Display Troubleshooting (A2, A18, A19, A27) . .
Evaluating your Display ...........
Backlight Intensity Check .........
Red, Green, or Blue Pixels Specifications . .
Dark Pixels Specifications .........
Newton’s Riis ..............
Troubleshooting a White Display .......
Troubleshooting a Black Display .......
Troubleshooting a Display with Color Problems
Front Panel Troubleshooting (Al, A2) ......
Check Front Panel LEDs After Preset .....
Identify the Stuck Key ............
Inspect Cables ................
Test Using a Controller ............
Run the Internal Diagnostic Tests ........
If the Fault Is Intermittent ...........
Repeat Test Function .............
HP-IB Failures .................
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........ 6-3
........ 64
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6-12
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6-12
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6-12
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6-13
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6-14
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6-16
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6-19
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