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Apple macintosh ii.iix.iifx サービスマニュアル

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 Troubleshooting
Symptom Charts/Hard Drive - 13
 
Hard Drive
 
Internal hard drive 
will not operate; LED 
doesn’t light; drive 
doesn’t spin
1 Remove hard drive data cable.
2 Replace internal hard drive power cable.
3 Verify +5V and 12V lines to hard drive.
4 Replace internal hard drive.
5 Replace logic board. Retain customer’s SIMMs.
Works with internal 
hard drive or 
external SCSI device 
but not with both
1 Verify that SCSI device switch setting on external device 
isn’t 0 (internal hard drive address) or 7 (computer 
address).
2 Verify proper SCSI termination. Refer to “SCSI 
Termination” in Additional Procedures.
3 Replace SCSI terminator on external device.
4 Troubleshoot external SCSI device.