Panasonic Toughbook CF-48 Service Manual page 23

No. Symptom
8 An operating system could
not be found
No. Symptom
1 Data cannot be sent or
received.
2 Unit will not communicate
with another computer
when connected directly.
3
Unit will not communicate
with modem.
4
Diagnostic Test reports
problem in serial port.
Troubleshooting
procedures
No.
Does executing
8-1
correct the problem?
Replace the HDD.
8-2 Does operation return to
normal?
Replace the HDD cable.
8-3 Does operation return to
normal?
Troubleshooting
procedures
No.
Is the COM port properly
1-1
set?
Is the same transmission
1-2 protocol set for both the
sending and receiving units?
Does the RS-232C on the
1-3 Main PCB operate normally
under a loopback test?
Is the connection cable a
2-1 dedicated cross-patched
cable?
Is the same transmission
2-2 protocol set for both the
sending and receiving units?
Does the RS-232C on the
2-3 Main PCB operate normally
under a reverse test?
Is the COM port properly
3-1
set?
Is the trasmission protocol
3-2
correct?
Does the modem operate
3-3 normally under a local
analog loopback test?
Does the RS-232C on the
3-4 main board operate normally
under a loopback test?
Is the loop back device
properly attached to the
4-1
connector (for an external
loop back)?
4 - 11
Source of
problem
Result
Format data
FDISK YES
destroyed
NO Go to No. 8-2
YES HDD
NO Go to No. 8-3
YES HDD cable
NO Main PCB
Source of
problem
Result
YES Go to No. 1-2
NO Improper setting
YES Go to No. 1-3
NO Improper setting
Check the
YES interface with the
other computer
NO Main PCB
YES Go to No. 2-2
NO Connection cable
YES Go to No. 2-3
NO Improper setting
Check the
YES interface with the
other computer
NO Main PCB
YES Go to No. 3-2
NO Improper setting
YES Go to No. 3-3
NO Improper setting
YES Line
NO Go to No. 3-4
YES Modem
NO Main PCB
YES Main PCB
NO Improper setting
Component
IC13
Component
IC23
IC25
IC23
IC25
IC23
IC25
IC23
IC25