Panasonic CF-73SCUTSBM Service Manual - Page 23

Serial Communication Diagnosis, Replace The Hdd.

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No. Symptom 8 An operating system could not be found. Troubleshooting No. procedures 8-1 Does executing FDISK correct the problem? Replace the HDD. 8-2 Does operation return to normal? Replace the HDD cable. 8-3 Does operation return to normal? Source of Result problem YES Format data destroyed NO Go to No.8-2 YES HDD NO Go to No.8-3 YES HDD cable NO Main PCB Component IC3 9.6 SERIAL COMMUNICATION DIAGNOSIS Make sure that connecting cables, connectors and AC adapter are not loose or disconnected prior to testing. 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 Source of No. procedures Result problem 1-1 Is the COM port properly set? YES Go to No.1-2 NO Improper setting Is the same transmission 1-2 protocol set for both the sending and receiving units? YES Go to No.1-3 NO Improper setting Component 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? Check the YES interface with the other computer NO Main PCB YES Go to No.2-2 NO Connection cable IC15 IC35 Is the same transmission 2-2 protocol set for both the sending and receiving units? YES Go to No.2-3 NO Improper setting Does the RS-232C on the 2-3 Main PCB operate normally under a reverse test? Check the YES interface with the other computer NO Main PCB 3-1 Is the COM port properly set? YES Go to No.3-2 NO Improper setting 3-2 Is the transmission protocol correct? YES Go to No.3-3 NO Improper setting Does the modem operate YES Line 3-3 normally under a local analog loopback test? NO Go to No.3-4 IC15 IC35 Does the RS-232C on the 3-4 main board operate normally under a loopback test? YES Modem NO Main PCB IC15 IC35 Is the loop back device 4-1 properly attached to the connector (for an external loop back)? YES Main PCB NO Improper setting IC15 IC35 20

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No.
Result
YES
Format data
destroyed
NO
Go to No.8-2
YES
HDD
NO
Go to No.8-3
YES
HDD cable
NO
Main PCB
IC3
9
.6 SERIAL COMMUNICATION DIAGNOSIS
Make sure that connecting cables, connectors and AC adapter are not loose or disconnected prior to testing.
No.
Result
YES
Go to No.1-2
NO
Improper setting
YES
Go to No.1-3
NO
Improper setting
YES
Check the
interface with the
other computer
NO
Main PCB
IC15
IC35
YES
Go to No.2-2
NO
Connection cable
YES
Go to No.2-3
NO
Improper setting
YES
Check the
interface with the
other computer
NO
Main PCB
IC15
IC35
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
IC15
IC35
YES
Main PCB
IC15
IC35
NO
Improper setting
Source of
problem
Component
Troubleshooting
procedures
Symptom
No.
An operating system
could not be found.
8
8-3
Replace the HDD cable.
Does operation return to
normal?
8-2
Does executing FDISK
correct the problem?
8-1
Replace the HDD.
Does operation return to
normal?
No.
Symptom
Troubleshooting
procedures
Source of
problem
1-3
Does the RS-232C on the
Main PCB operate normally
under a loopback test?
Component
1-1
Is the COM port properly set?
1-2
Is the same transmission
protocol set for both the
sending and receiving units?
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
2-1
Is the connection cable a
dedicated cross-patched
cable?
2-2
Is the same transmission
protocol set for both the
sending and receiving units?
2-3
Does the RS-232C on the
Main PCB operate normally
under a reverse test?
3-3
Does the modem operate
normally under a local analog
loopback test?
3-1
Is the COM port properly set?
3-2
Is the transmission protocol
correct?
Data cannot be sent or
received.
1
2
Unit will not communicate
with another computer
when connected directly.
4
Diagnostic Test reports
problem in serial port.
Unit will not communicate
with modem.
3
20