2HJ/2HK
1-4-21
7414
Yellow drum unit non- installing error
The EEPROM (U401) on the drum PWB
3 (KP-972) inside the yellow drum unit
does not communicate normally.
The incompatible drum unit is installed
to the printer.
Defective harness
between drum PWB
3 (KP-972) and
printer main unit or
poor contact of the
connector termi-
nals.
Check the connection of the yellow drum
unit and the printer main unit, check the con-
tinuity of the harness (S03211), if there is
trouble, remedy or replace.
Installing the drum
unit, which is
incompatible with
the printer specifi-
cation.
Install the compatible drum unit to the
printer.
Defective drum
PWB 3 (KP-972).
Replace the drum PWB 3 (KP-972).
Defective LED print
heads relay PWB
(A0176).
Replace the engine controller PWB (A0004).
See page 1-5-41.
Defective LED print
heads relay PWB
(A0176).
Replace the LED print heads relay PWB
(A0176). See page 1-5-44.
Defective harness
(S03214) between
engine controller
PWB (A0004) and
LED print heads
relay PWB (A0176)
or poor contact of
the connector termi-
nals.
Check the continuity of the harness
(S03214), check the connection YC3 con-
nector of the engine controller PWB
(A0004), if there is trouble, remedy or
replace.
7600
Toner ID sensor error
The detection signal of the toner ID sen-
sor was abnormal value.
Defective toner ID
sensor.
Replace the toner ID sensor.
Defective engine
controller PWB
(A0004).
Replace the engine controller PWB (A0004).
See page 1-5-41.
Defective harness
(S03195) between
engine controller
PWB (A0004) and
toner ID sensor or
poor contact of the
connector termi-
nals.
Check the continuity of the harness
(S03195), check the connection YC11 con-
nector of the engine controller PWB
(A0004), if there is trouble, remedy or
replace.
9530
Backup data error
The serial number of the machine writ-
ten on the EEPROM of the engine con-
troller PWB (A0004) differs with that is
written on both the flash memory of the
engine controller PWB (A0004) and the
EEPROM of the drum PWB as a
backup.
Replacing both the
engine controller
PWB (A0004) and
the drum unit at the
same time.
Check that the machine operates properly
by reverting the engine controller and the
drum unit to the old ones. To replace the
engine controller PWB (A0004) and the
drum unit at the same time, turn on the
printer after replacing either one.
Check that the printer operates properly and
then turn off the printer. Replace the other
and turn on the printer to check that the
printer operates properly. Be sure to replace
one by one.
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