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No.
8
An operating system could
not be found
4.4.7. SERIAL COMMUNICATION DIAGNOSIS
Make sure that connecting cables, connectors and AC adapter are not loose or disconnected prior to testing.
No.
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.
Symptom
No.
8-1
8-2
8-3
Symptom
No.
1-1
1-2
1-3
2-1
2-2
2-3
3-1
3-2
3-3
3-4
4-1
Troubleshooting
procedures
Does
executing
FDISK
correct the problem?
Replace the HDD.
Does operation return to
normal?
Replace the HDD cable.
Does operation return to
normal?
Troubleshooting
procedures
Is the COM port properly
set?
Is the same transmission
protocol set for both the
sending and receiving units?
Does the RS-232C on the
Main PCB operate normally
under a loopback test?
Is the connection cable a
dedicated cross-patched
cable?
Is the same transmission
protocol set for both the
sending and receiving units?
Does the RS-232C on the
Main PCB operate normally
under a reverse test?
Is the COM port properly
set?
Is the trasmission protocol
correct?
Does the modem operate
normally under a local
analog loopback test?
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)?
4 - 11
Source of
problem
Result
Format data
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
IC3
Component
IC5
IC30
IC5
IC30
IC5
IC30
IC5
IC30
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