Panasonic Toughbook CF-50 Service Manual page 26

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