TROUBLESHOOTING GUIDE

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.