7403 Developing Unit M Non-Installing Error; 7404 Developing Unit Y Non-Installing Error; 7411 Drum Unit K Non-Installing Error - Kyocera FS-C5350DN Service Manual

Code
7403 Developing unit M non-installing error
No density detection signal is output
from toner sensor M in developing unit
M.
7404 Developing unit Y non-installing error
No density detection signal is output
from toner sensor Y in developing unit Y.
7411 Drum unit K non-installing error
The EEPROM of drum PWB K does not
communicate normally.
Contents
Causes Check procedures/corrective measures
Faulty connection Check the installation of the developing unit
of the connector M and drum relay PWB and reinstall them if
between the devel- necessary (See page 1-5-12).
oping PWB M and
drum relay PWB.
Defective harness Reinsert the connector. Also check for conti-
between drum nuity within the connector harness. If none,
relay PWB (YC1) remedy or replace the harness.
and engine PWB
(YC34), or
improper connec-
tor insertion.
Defective toner Replace the developing unit M (See page 1-
sensor M. 5-12).
Defective engine Replace the engine PWB (See page 1-5-
PWB. 29).
Faulty connection Check the installation of the developing unit
of the connector Y and drum relay PWB and reinstall them if
between the devel- necessary (See page 1-5-12).
oping PWB Y and
drum relay PWB.
Defective harness Reinsert the connector. Also check for conti-
between drum nuity within the connector harness. If none,
relay PWB (YC1) remedy or replace the harness.
and engine PWB
(YC34), or
improper connec-
tor insertion.
Defective toner Replace the developing unit Y (See page 1-
sensor Y. 5-12).
Defective engine Replace the engine PWB (See page 1-5-
PWB. 29).
Faulty connection Check the installation of the drum unit K and
of the connector drum relay PWB and reinstall them if neces-
between the drum sary (See page 1-5-14).
PWB K and drum
relay PWB.
Defective harness Reinsert the connector. Also check for conti-
between drum nuity within the connector harness. If none,
relay PWB (YC1) remedy or replace the harness.
and engine PWB
(YC34), or
improper connec-
tor insertion.
Installation of Install drum unit K compatible with the spec-
incompatible drum ifications to the printer.
unit K.
Defective drum Replace the drum unit Y (See page 1-5-14).
PWB K.
Defective engine Replace the engine PWB (See page 1-5-
PWB. 29).
Remarks
2K8
1-4-17