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Apple quadra.lc 630.performa 640 Service Manual

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 Troubleshooting
Symptom Charts/Error Chords - 2
 
Symptom Charts
 
Error Chords
 
Eight-tone error 
chord sounds during 
startup
1 Reseat SIMMs
2 Replace SIMMs.  
3 Replace logic board. Retain customer’s SIMMs.
4 Perform SIMM verification on replacement logic board.
Four-tone error 
chord sounds during 
startup
1 Disconnect hard drive power cable and reboot system.  If 
startup sequence is normal, run “Macintosh Hard Disk Test” 
and replace hard drive if necessary.
2 Disconnect floppy drive cable and reboot system.  If startup 
sequence is normal, replace floppy drive.
3 Replace logic board.  Retain customer’s SIMMs.