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Chapter 4
81
Undetermined Problems
Undetermined problems are those for which diagnostic tests cannot identify the cause. This may be a failure to
detemine which adapter or device failed, which installed device is malfunctioning, a short circuit is suspected,
or when the system is inoperative.
IMPORTANT:
Verify that all attached devices are supported by the computer, and that power supply to the
computer is good.
Follow these procedures to isolate the failing FRU (do not isolate non-defective FRU).
1.
Shut down the computer.
2.
Visually check the failing FRU for damage. If any problems are found, replace the FRU.
3.
Remove or disconnect all the following devices:
t
Non-Acer devices
t
Printer, mouse, and other external devices
t
Battery pack
t
Hard disk drive
t
DIMM
t
Optical drive/diskette drive
t
Cards in the ExpressCard/54 and card reader slots
4.
Power on the computer.
5.
Determine if the problem has changed.
6.
If the problem does not recur, reconnect the removed devices one at a time until you find the failing FRU.
7.
If the problem remains, replace the following FRU one at a time. Do not replace a non-defective FRU:
t
System board
t
LCD module assembly
Acer TM 4520 SG.book Page 81 Friday, June 22, 2007 5:43 PM
Содержание Extensa 4120
Страница 6: ...VI ...
Страница 10: ...X Table of Contents ...
Страница 36: ...26 Chapter 2 ...
Страница 66: ...56 Chapter 3 2 Release the speaker cable from its lower case latches 3 Remove the speakers from the lower case ...
Страница 93: ...Chapter 5 83 System Block Diagram System Block Diagram and Board Layout Chapter 5 ...
Страница 98: ...88 Chapter 6 Aspire 5910 Exploded Diagram ...
Страница 99: ...Chapter 6 89 TravelMate 4520 FRU List Category No Part Name and Description Acer Part No Audio related Boards ...
Страница 100: ...90 Chapter 6 Cables Category No Part Name and Description Acer Part No ...
Страница 101: ...Chapter 6 91 Fan Hard Disk Drive Category No Part Name and Description Acer Part No ...
Страница 102: ...92 Chapter 6 Keyboard Category No Part Name and Description Acer Part No ...
Страница 103: ...Chapter 6 93 Keyboard TM LCD Panel Category No Part Name and Description Acer Part No ...
Страница 104: ...94 Chapter 6 Mechanical parts Category No Part Name and Description Acer Part No ...
Страница 105: ...Chapter 6 95 Memory Optical Disc Drive Category No Part Name and Description Acer Part No ...
Страница 106: ...96 Chapter 6 Power related Processor Category No Part Name and Description Acer Part No ...
Страница 107: ...Chapter 6 97 Screws Miscellaneous Category No Part Name and Description Acer Part No ...
Страница 108: ...98 Chapter 6 Category No Part Name and Description Acer Part No Audio related Boards ...
Страница 109: ...Chapter 6 99 Cables Category No Part Name and Description Acer Part No ...
Страница 110: ...100 Chapter 6 Fan Hard Disk Drive Category No Part Name and Description Acer Part No ...
Страница 111: ...Chapter 6 101 Keyboard Category No Part Name and Description Acer Part No ...
Страница 112: ...102 Chapter 6 Keyboard TM LCD Panel Category No Part Name and Description Acer Part No ...
Страница 113: ...Chapter 6 103 Mechanical parts Category No Part Name and Description Acer Part No ...
Страница 114: ...104 Chapter 6 Memory Optical Disc Drive Category No Part Name and Description Acer Part No ...
Страница 115: ...Chapter 6 105 Power related Processor Category No Part Name and Description Acer Part No ...
Страница 116: ...106 Chapter 6 Screws Miscellaneous Category No Part Name and Description Acer Part No ...
Страница 122: ...112 Appendix A ...
Страница 136: ...126 Appendix C ...
Страница 143: ...Index 133 ...