Apple quadra 840av 服务手册

 

 Troubleshooting

Symptom Charts/Hard Drive - 12

 

Single internal hard 

drive does not 

operate; drive 

doesn’t spin

1 Replace hard drive power cable.

2 Replace hard drive.

3 Replace power supply.

No internal SCSI 

devices operate

1 Verify there are no duplicate SCSI device addresses—internal 

and external.

2 Replace SCSI data cable.

3 Replace power supply.

4 Replace logic board. Retain customer’s SIMMs.

Drive does not appear 

on the desktop

1 Verify there are no duplicate SCSI device addresses.

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

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

appears.

3 If drive is not initialized, use HD SC Setup to initialize.