Service manual

3-1 IP-421 PRINT CONTROLLER
Chapter 3 Troubleshooting
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■ Troubleshooting
This section offers a summary of information on troubleshooting that technicians could refer to easily and would
minimize the time of interruption of work.
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● Troubleshooting of the IP-421 and copier
Symptoms
Printer mode window does not
appear on the copier’s display
after power-on.
“Warming up” does not disap-
pear.
“Initialization ” does not disap-
pear on the copier screen.
Printout is defective, or nothing
can be printed.
IP-421 does not start.
Test print can be produced but
not from the parallel port.
Causes
No power supply to the IP-421.
Copier is in trouble.
The IP-421 has not started prop-
erly.
The controller board or some
boards of the copier are defec-
tive.
The controller board is inactive.
Software of the IP-421 is de-
stroyed.
The parallel port has something
wrong or the cable is wrong
or, the problem is on the com-
puter side.
Actions
Check if the IP-421 is connected
with the copier properly.
Locate the cause of trouble of
the copier.
See the column of “IP-421 does
not start”.
Put the copier in 36 mode and
perform test. If it operates prop-
erly, controller board may be
failure.
Check the connector of the con-
troller board. Replace the con-
troller board as necessary.
Reinstall the software of the IP-
421.
Check the cables (internal/ex-
ternal). Perform test using a
data generator or a well-proven
PC/I/O cable. Replace the con-
troller board as necessary.
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