Apple quadra.lc 630.performa 640 Service Manual

 

 Troubleshooting

Symptom Charts/Peripheral - 14

 

Works with internal 

or external SCSI 

device but does not 

work with both

1 Verify that SCSI select switch on  external device is set to 

different  priority from internal CD-ROM drive.

2 Verify that both ends of external SCSI  device are terminated.

3 Replace terminator on external device.

4 Verify that terminator is installed on    internal SCSI drive.

5 Replace SCSI select cable (on external SCSI device).

Cursor does not move

1 Reboot system.

2 Check mouse connection.

3 If mouse was connected to keyboard,  connect mouse to rear 

ADB port and disconnect keyboard.  If mouse works, replace 

keyboard.

4 If mouse does not work in ADB port,  replace mouse.

5 Reseat logic board.

6 Replace logic board.  Retain customer’s  SIMMs.