Motorola 660AV ユーザーズマニュアル

 

 Troubleshooting

Symptom Charts/Video

 

 (Continued)

 

 - 9

 

Screen is black, audio 

and drive do not 

operate, but fan is 

running and LED is lit

1 Remove peripherals and cards.

2 Remove expansion card.

3 Replace DRAM SIMMs. See Memory

4 manual. 

5 Replace power supply.

6 Replace logic board.

Partial or whole 

screen is bright and 

audio is present, but 

no video information 

is visible

1 Replace monitor. Refer to appropriate monitor manual to 

troubleshoot defective monitor. 

2 Replace video cable.

3 Replace video card, if installed.

4 Clear parameter RAM. Hold down <Command> <Option> <P> 

<R> during startup but before “Welcome To Macintosh” 

appears.

5 Replace logic board. Retain customer’s SIMMs.