23
1.5 FDD DIAGNOSIS
Make sure that connecting cables, connectors and AC adapter are not loose or disconnected prior to testing.
YES
NO
No. Symptom
Troubleshooting
procedures
Source of
problem
No.
Result
1
1-1
Replace the FDD.
Does operation return to
normal?
Access lamp does not
light.
Component
FDD
Go to No. 1-2
2
2-1
In the floppy disk warped or
bent, or labels interfering?
Cannot insert floppy disk.
Cannot remove floppy disk.
Floppy disk
FDD
YES
NO
3
3-1
Are there system files on the
media?
Does not boot from FDD. Main PCB
Software
IC37
YES
NO
4
4-1
Is the floppy disk format
correct for the operating
system currently being used?
Cannot read from floppy
disk.
Cannot write to floppy disk.
Go to No. 4-2
Floppy disk format
YES
NO
5
5-1
Try cleaning the disk heads.
Does this fix the problem?
Floppy disk is scratched or
otherwise damaged.
Heads were dirty
FDD
YES
NO
6
6-1
Was the eject button pressed
while the system was
accessing the disk?
Content of floppy disk is
destroyed.
Operating mistake
Go to No. 6-2
YES
NO
6-2
Replace the FDD.
Does operation return to
normal?
FDD
Main PCB
IC37
YES
NO
7
7-1
Does this occur for a specific
floppy disk?
Damage to contents written
to floppy disk.
Damage to contents read
from floppy disk.
Floppy disk
Go to No. 7-2
YES
NO
8
8-1
Does it sound like the head is
moving?
Abnormal sound. Normal
Go to No. 8-2
YES
NO
7-2
7-3
Replace the FDD.
Does operation return to
normal?
Replace the FDD FPC.
Does operation return to
normal?
8-2
Does the abnormal sound
stop when the motor stops
running.
FDD
FDD FPC
Go to No. 7-3
Main PCB
IC37
YES
YES
NO
NO
FDDYES
9
9-1
9-2
Replace the FDD.
Does operation return to
normal?
Replace the FDD FPC.
Does operation return to
normal?
Diagnostic Test reports
problem in FDC.
FDD
FDD FPC
Go to No. 9-2
Main PCB
IC37
YES
YES
NO
NO
4-2
Does this occur for a specific
floppy disk?
Floppy disk
Go to No. 4-3
YES
NO
4-3
Try cleaning the disk heads.
Does this fix the problem?
Heads were dirty
Go to No. 4-4
YES
NO
4-4
4-5
Replace the FDD.
Does operation return to
normal?
Replace the FDD FPC.
Does operation return to
normal?
FDD
Go to No. 4-5
YES
NO
1-2
Replace the LED PCB.
Does operation return to
normal?
LED PCB
Go to No. 1-3
LD2005
YES
NO
1-3
Replace the Main PCB.
Does operation return to
normal?
Main PCB
FDD FPC
IC37
YES
NO
FDD FPC
Main PCB
IC37
YES
NO
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