Read Panasonic CF-28 Service Manual online
4.4.5 FDD DIAGNOSIS
Make sure that connecting cables, connectors and AC adapter are not loose or disconnected prior to
testing.
testing.
YES
NO
No.
Symptom
Troubleshooting
procedures
Source of
problem
No.
Result
1
1-1
Replace the FDD.
Does operation return to
normal?
Does operation return to
normal?
Access lamp does not
light.
light.
Component
FDD
Go to No. 1-2
2
2-1
In the floppy disk warped or
bent, or labels interfering?
bent, or labels interfering?
Cannot insert floppy disk.
Cannot remove floppy disk.
Cannot remove floppy disk.
Floppy disk
FDD
FDD
YES
NO
3
3-1
Are there system files on the
media?
media?
Does not boot from FDD.
Main PCB
Software
Software
IC43
YES
NO
4
4-1
Is the floppy disk format
correct for the operating
system currently being used?
correct for the operating
system currently being used?
Cannot read from floppy
disk.
Cannot write to floppy disk.
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?
Does this fix the problem?
Floppy disk is scratched or
otherwise damaged.
otherwise damaged.
Heads were dirty
FDD
FDD
YES
NO
6
6-1
Was the eject button pressed
while the system was
accessing the disk?
while the system was
accessing the disk?
Content of floppy disk is
destroyed.
destroyed.
Operating mistake
Go to No. 6-2
YES
NO
6-2
Replace the FDD.
Does operation return to
normal?
Does operation return to
normal?
FDD
Main PCB
IC43
YES
NO
7
7-1
Does this occur for a specific
floppy disk?
floppy disk?
Damage to contents written
to floppy disk.
Damage to contents read
from floppy disk.
to floppy disk.
Damage to contents read
from floppy disk.
Floppy disk
Go to No. 7-2
Go to No. 7-2
YES
NO
8
8-1
Does it sound like the head is
moving?
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?
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.
stop when the motor stops
running.
FDD
FDD FPC
Go to No. 7-3
Main PCB
IC43
YES
YES
NO
NO
FDD
YES
9
9-1
9-2
Replace the FDD.
Does operation return to
normal?
Replace the FDD FPC.
Does operation return to
normal?
Does operation return to
normal?
Replace the FDD FPC.
Does operation return to
normal?
Diagnostic Test reports
problem in FDC.
problem in FDC.
FDD
FDD FPC
Go to No. 9-2
Main PCB
IC43
YES
YES
NO
NO
4-2
Does this occur for a specific
floppy disk?
floppy disk?
Floppy disk
Go to No. 4-3
Go to No. 4-3
YES
NO
4-3
Try cleaning the disk heads.
Does this fix the problem?
Does this fix the problem?
Heads were dirty
Go to No. 4-4
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?
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?
Does operation return to
normal?
LED PCB
Go to No. 1-3
LD4
YES
NO
1-3
Replace the Main PCB.
Does operation return to
normal?
Does operation return to
normal?
Main PCB
FDD FPC
IC43
YES
NO
FDD FPC
Main PCB
IC43
YES
NO
4 - 9
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