Triumph Adler CLP3316, Service Manual

Page: 68 / 188

2HJ/2HK
1-4-18
7404 Yellow developer unit non- installing
error
The toner sensor 3 inside the yellow
developer unit did not output the density
detection signal, judged the engine con-
troller PWB (A0004) the yellow devel-
oper 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
1-5-12.
Defective engine
controller PWB
(A0004). Replace the engine controller PWB (A0004).
See page 1-5-41.
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.
The incompatible drum unit is installed to
the printer.
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 (S03211), if there is trou-
ble, 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 4 (KP-972). Replace the drum PWB 4 (KP-972).
Defective engine
controller PWB
(A0004). 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 ter-
minals. 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.
Code Contents
Remarks
Causes Check procedures/corrective measures