Kyocera DF-420, Service Manual

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3MZ
1-5-1
1-5 Troubleshooting
1-5-1 Self-diagnosis
(1) Self-diagnostic function
This unit is equipped with a self-diagnostic function. When a problem is detected, copying is disabled and the problem dis-
played as a code consisting of C followed by a number, indicating the nature of the problem.
A message is also displayed requesting the user to call for service.
After removing the problem, the self-diagnostic function can be reset by turning the main power switch off and back on.
(2) Self diagnostic codes
Code Contents
Remarks
Causes Check procedures/corrective measures
C0030 Fax control PWB system problem
Processing with the fax software was
disabled due to a hardware or software
problem.
Defective fax con-
trol PWB. Replace the fax control PWB and verify the
operation.
C0070 Abnormal detection of fax control
PWB incompatibility
Fax software is not compatible with main
software
Fax software or
main software is
something of the
other machine. Check the version of the fax software and
the main software, upgrade the version to
the compatible software.
C0280 Communication problem between the
fax control PWB and main PWB
Communication between the fax control
PWB and the main PWB of the machine
cannot be performed normally.
Poor contact in the
connector termi-
nals. Reinsert the connector. Also check for conti-
nuity within the connector cable. If none,
remedy or replace the cable.
Defective PWB. Replace the fax control PWB or main PWB
and check for correct operation.
C0820 Fax control PWB CG ROM checksum
error
A checksum error occurred with the CG
ROM data of the fax control PWB.
Defective fax con-
trol PWB. Replace the fax control PWB and verify the
operation.
C0830 Fax control PWB flash program area
checksum error
A checksum error occurred with the pro-
gram of the fax control PWB.
Defective fax con-
trol PWB. Replace the fax control PWB and verify the
operation.
C0860 Fax control PWB software switch
checksum error
A checksum error occurred with the soft-
ware switch value of the fax control
PWB.
Defective fax soft-
ware. Install the fax software.
Defective fax con-
trol PWB. Replace the fax control PWB and verify the
operation.
C0870 Fax control PWB to main PWB high
capacity data transfer problem
High-capacity data transfer between the
fax control PWB and the main PWB of
the machine was not normally performed
even if the data transfer was retried the
specified times.
Poor contact in the
connector termi-
nals. Reinsert the connector. Also check for conti-
nuity within the connector cable. If none,
remedy or replace the cable.
Defective PWB. Replace the fax control PWB or main PWB
and check for correct operation.
C0880 Fax control PWB program archive
problem (optional fax)
When power is turned on, the com-
pressed program in the Flash ROM on
the fax control PWB was not success-
fully decompressed.
Defective fax con-
trol PWB. Replace the fax control PWB and verify the
operation.