DOWNLOAD Panasonic CF-48 Service Manual ↓ Size: 5.5 MB | Pages: 107 in PDF or view online for FREE

Model
CF-48
Pages
107
Size
5.5 MB
Type
PDF
Document
Service Manual
Brand
Device
PC / NOTEBOOK COMPUTER
File
cf-48.pdf
Date
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Panasonic CF-48 Service Manual ▷ View online

4 - 9
4.4.5 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.
M
ain PCB
Software
IC23
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
IC23
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
IC23
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?
Diagnostic Test reports
problem in FDC.
FDD
FDD FPC
Go to No. 9-2
Main PCB
IC23
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
LD805
YES
NO
1-3
Replace the Main PCB.
Does operation return to
normal?
Main PCB
FDD FPC
IC23
YES
NO
FDD FPC
Main PCB
IC23
YES
NO
4 - 10
4.4.6 HDD DIAGNOSIS
Make sure that connecting cables, connectors and AC adapter are not loose or disconnected prior to testing.
NO
No.
Symptom
Troubleshooting
procedures
Source of
problem
No.
Result
1
1-1
Has the HDD been partitioned?
Does not boot from HDD.
Component
Go to No. 1-2
Improper setting
YES
NO
2
2-1
Has the HDD been formatted?
Cannot read from HDD.
Cannot write to HDD.
Go to No. 2-2
HDD format
YES
NO
3
3-1
3-2
Replace the HDD.
Does operation return to
normal?
Replace the HDD cable.
Does operation return to
normal?
Replace the HDD.
Does operation return to
normal?
Replace the LED PCB.
Does operation return to
normal?
Replace the Main PCB.
Does operation return to
normal?
Damage to data written to
HDD.
Damage to data read from
HDD.
HDD contents are
destroyed.
HDD
Go to No. 3-2
YES
5
5-1
5-2
5-3
5-4
Has the HDD been
configured in the OS?
Access lamp does not
light.
Go to No. 5-2
Improper setting
YES
NO
4
4-1
Replace the HDD.
Does operation return to
normal?
Dignositic Test reports
problem in HDC or HDD.
6
6-1
Replace the HDD.
Abnormal sound.
HDD
2-2
2-3
Replace the HDD.
Does operation return to
normal?
Replace the HDD cable.
Does operation return to
normal?
HDD
Go to No. 2-3
YES
NO
1-2
Are there system files on the
HDD?
Go to No. 1-3
Software on the
HDD
YES
NO
1-3
1-4
Replace the HDD.
Does operation return to
normal?
Replace the HDD cable.
Does operation return to
normal?
HDD
HDD cable
Go to No. 1-4
Main PCB
IC13
YES
YES
NO
NO
HDD cable
Main PCB
IC13
YES
NO
HDD cable
Main PCB
IC13
YES
NO
HDD
Main PCB
IC13
YES
NO
HDD
Go to No. 5-3
YES
NO
LED PCB
Go to No. 5-4
LD806
YES
NO
Main PCB
HDD cable
IC13
YES
NO
7
Hard disk failure
Does executing FDISK
correct the problem?
7-1
HDD cable
YES
Main PCB
NO
IC13
Go to No. 7-2
NO
Format data
destroyed
YES
Replace the HDD.
Does operation return to
normal?
7-2
Go to No. 7-3
NO
HDD 
YES
Replace the HDD cable.
Does opration return to
normal?
7-3
4 - 11
No.
Symptom
Troubleshooting
procedures
Source of
problem
No.
Result
Component
HDD cable
YES
Main PCB
NO
IC13
8-2
8-3
8
Format data
destroyed
Does executing FDISK
correct the problem?
YES
Go to No. 8-2
NO
8-1
An operating system could
not be found
HDD 
Replace the HDD.
Does operation return to
normal?
Replace the HDD cable.
Does operation return to
normal?
YES
Go to No. 8-3
NO
4.4.7 SERIAL COMMUNICATION DIAGNOSIS
Make sure that connecting cables, connectors and AC adapter are not loose or disconnected prior to testing.
1-2
Is the same transmission
protocol set for both the
sending and receiving units?
YES
YES
NO
NO
No.
Symptom
Troubleshooting
procedures
Source of
problem
Component
No.
Result
1
Data cannot be sent or
received.
Unit will not communicate
with another computer
when connected directly.
Does the RS-232C on the
Main PCB operate normally
under a loopback test?
1-3
Is the connection cable a
dedicated cross-patched
cable?
2-1
Is the same transmission
protocol set for both the
sending and receiving units?
2-2
1-1
Is the COM port properly
set?
YES
Go to No. 1-2
NO
Improper setting
2
Unit will not communicate
with modem.
3
Diagnostic Test reports
problem in serial port.
4
Go to No. 1-3
Check the
interface with the
other computer
Main PCB
IC23
IC25
Improper setting
YES
NO
Go to No. 2-2
Connection cable
YES
NO
Go to No. 2-3
Improper setting
Is the COM port properly
set?
3-1
YES
NO
Go to No. 3-2
Improper setting
YES
NO
Does the RS-232C on the
Main PCB operate normally
under a reverse test?
2-3
Check the
interface with the
other computer
Main PCB
IC23
IC25
Is the trasmission protocol
correct?
3-2
YES
NO
Go to No. 3-3
Improper setting
Does the modem operate
normally under a local
analog loopback test?
3-3
YES
NO
Line
Go to No. 3-4
Does the RS-232C on the
main board operate normally
under a loopback test?
Is the loop back device
properly attached to the
connector (for an external
loop back)?
3-4
4-1
YES
YES
NO
Modem
Main PCB
Main PCB
IC23
IC25
IC23
IC25
NO
Improper setting
4 - 12
4.4.8 PRINTING DIAGNOSIS
Make sure that connecting cables, connectors and AC adapter are not loose or disconnected prior to testing.
No.
Symptom
Troubleshooting
procedures
Source of
problem
Component
No.
Result
1
Data does not print from
the printer.
1-1
Does the printer pass its
self-printing test?
YES
Main PCB
IC23
NO
Printer
2-2
Is the Parallel Port (Data
Direction) setting correct?
YES
Main PCB
IC23
NO
Improper setting
2
Data prints out incorrectly.
2-1
Does the printer pass its
self-printing test?
3
The unit hangs after
outputting data from the
printer.
3-1
Replace the Main PCB.
Does operation return to
normal?
YES
Go to No. 2-2
NO
Printer
YES
Main PCB
IC23
NO
Printer
4
Print area is out of line.
4-1
Does the printer pass its
self-printing test?
YES
Main PCB
IC23
NO
Printer
5
Data is printed all on one
line.
(Carriage return does not
work.)
4-2
Does the printer pass its
self-printing test?
YES
Main PCB
IC23
NO
Printer
4.4.9 CD-ROM Drive DIAGNOSIS
Make sure that connecting cables, connectors and AC adapter are not loose or disconnected prior to testing.
No.
Symptom
Troubleshooting
procedures
Source of
problem
Component
No.
Result
1
Access lamp does not
light.
1-1
1-2
Replace the CD-ROM drive.
Does operation return to
normal?
Replace the LED PCB.
Does operation return to
normal?
YES
YES
CD-ROM drive
LED PCB
NO
NO
Go to No. 1-2
Go to No. 1-3
LD804
2-2
Replace the CD-ROM drive.
Does operation return to
normal?
YES
CD-ROM drive
NO
Main PCB
IC13
2
Cannot read from DVD.
2-1
Replace the media.
Does operation return to
normal?
3
Tray does not open.
3-1
Replace the CD-ROM drive.
Does operation return to
normal?
YES
Media
NO
Go to No. 2-2
YES
CD-ROM drive
NO
Main PCB
IC13
4
Abnormal sound.
4-1
Replace the media.
Does operation return to
normal?
YES
Media
NO
CD-ROM drive
1-3
Replace the Main PCB.
Does operation return to
normal?
YES
Main PCB
NO
CD-ROM FPC
IC13
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