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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
Check read/write head.
Passes the performance test but
will not load certain programs.
Check stepper motor.

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This page has been created by Sami Rautiainen.
Read the small print. Last updated September 05, 2020.