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| SYMPTOM | POSSIBLE SOLUTION |
|---|---|
| Fails to format disk. | Check components related to connector P7. Check 6522s. Check the logic array. |
| Stepper Motor does not step forward. | Check 6502, 6522s, logic array. |
| Drive speed will not stabilize. | Check DC motor. |
| Will not save when the drive heats up. |
Check 6502 microprocessor. |
| Locks-up when loading. | Check serial port components. Check ROM. |
| Fails the performance test and displays a 21 read error. |
Check test diskette. Check Drive Motor. |
| Fails the performance test and displays a 27 read error. |
Check stop adjust. |
| Passes performance test to track 18 then displays 21 read error. |
Check read/write head. |
| Passes the performance test but will not load certain programs. |
Check stepper motor. |