2F3/2F4-3.0
1-5-17
7404
Yellow developer unit non- installing
error
• The toner sensor 3 inside the yellow
developer unit did not output the den-
sity detection signal, judged the
engine controller PWB (A0004) the
yellow developer unit is not installed.
Defective harness
of the toner sensor
3, defective con-
nection of the con-
nector between
yellow developer
unit and the printer
main unit or poor
contact of the con-
nector terminals.
Check the damage of harness of the toner
sensor 3, check the connection of the con-
nector with the yellow developer unit and the
printer main unit, if there is trouble, remedy
or replace.
Defective toner
sensor 3.
Replace the yellow developer unit. See page
1-6-12.
Defective engine
controller PWB
(A0004).
Replace the engine controller PWB (A0004).
See page 1-6-41.
Defective engine
relay PWB
(A0009).
Replace the engine relay PWB (A0009).
7411
Black drum unit non- installing error
• The EEPROM (U401) on the drum
PWB 4 (KP-972) inside the black drum
unit does not communicate normally.
Defective harness
between drum
PWB 4 (KP-972)
and printer main
unit or poor contact
of the connector
terminals.
Check the connection of the black drum unit
and the printer main unit, check the continu-
ity of the harness (S02867), if there is trou-
ble, remedy or replace.
Defective drum
PWB 4 (KP-972).
Replace the drum PWB 4 (KP-972).
Defective engine
controller PWB
(A0004).
Replace the engine controller PWB (A0004).
See page 1-6-41.
Defective LED print
heads relay PWB
(A0008).
Replace the LED print heads relay PWB
(A0008). See page 1-6-44.
Defective harness
(S02869) between
engine controller
PWB (A0004) and
LED print heads
relay PWB (A0008)
or poor contact of
the connector ter-
minals.
Check the continuity of the harness
(S02869), check the connection YC3 con-
nector of the engine controller PWB
(A0004), if there is trouble, remedy or
replace.
Code
Contents
Remarks
Causes
Check procedures/corrective measures
The incompatible drum unit is installed
to the printer.
Installing the drum
unit, which is
incompatible with
the printer
specification.
Install the compatible drum unit to the
printer.
Содержание C5020N - FS Color LED Printer
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