| NOTE: | Always check for latest ROM/ECO upgrade. If socketed IC is suspected bad, be to check socket with ohmmeter. |
|---|
| SYMPTOM | POSSIBLE SOLUTION |
|---|---|
| No LED's on power up. | Is Power cord plugged into wall outlet correctly? Is Power cord plugged in the disk drive correctly? Check line fuse. Check power switch. Check clock on 6502 pin 37. Check +5 and +12 volt lines. |
| Error LED flashes on power up. | Check all RAM and ROM locations. |
| Error LED stays on all the time. | Check 6502 microprocessor. Check ROMs. |
| Drive motor runs continuously and red LED stays on. |
Check +12V. Check 6502, logic gates, logic array. |
| Drive motor runs continuously and red LED stays off. |
Check Rom Check drive motor PCB. |
| Drive motor runs continuously with no red or green LED's. |
Check VR2 (5V Regulator) Check Power Transformer. |
| After the drive warms up the motor runs continuously. |
Check 6522s. Check motor control PCB. |
| Loads programs with red LED flashing. |
Check drive speed. Check stepper motor. |
| Loading is intermittent. | Check ROMs. Check drive alignment. |
| Does not load when hot or LED flashed 3 times. |
Check ROMs. |
| Searches with LED flashing continuously. |
Check ROMs. |
| Searching with no red LED. | Check 6522s, logic gates, logic array. |
| Message 'FILE NOT FOUND' is displayed |
Clean drive head w/alcohol. Check 0 stop adjustment. Check alignment. |
| Drive fails to read. | Check the 311, 9602, and 592s. There are two +12 volt sources for stepper output and read circuit, make sure both are good. |