Apple performa 400 series Servicehandbuch

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 Troubleshooting
Symptom Charts/Error Chords - 2
 
Symptom Charts
 
Error Chords
 
Eight-tone error 
chord sounds during 
startup 
1 Replace SIMMs. 
2 Replace logic board. Retain customer’s SIMMs.
3 Perform SIMM verification on replacement logic board.
Four-tone error 
chord sounds during 
startup 
1 Disconnect hard drive power cable and hard drive data 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.