Olivetti d-COLOR P2026, Service Manual, Page: 80 / 207

Check procedures/
corrective measures
Reinsert the connector. Also check for conti-
nuity within the connector cable. If none,
replace the cable.
Developing unit Y and Drum relay PWB
(YC13)
Drum relay PWB (YC1) and engine PWB
(YC34)
Replace the developing unit Y (see page 1-
5-18).
Replace the engine PWB and check for cor-
rect operation (see page 1-5-26).
Install drum unit K compatible with the spec-
ifications to the machine.
Reinsert the connector. Also check for conti-
nuity within the connector cable. If none,
replace the cable.
Drum unit K and Drum relay PWB (YC2)
Drum relay PWB (YC1) and engine PWB
(YC34)
Replace the drum unit K (see page 1-5-20).
Replace the engine PWB and check for cor-
rect operation (see page 1-5-26).
Install drum unit C compatible with the spec-
ifications to the machine.
Reinsert the connector. Also check for conti-
nuity within the connector cable. If none,
replace the cable.
Drum unit C and Drum relay PWB (YC4)
Drum relay PWB (YC1) and engine PWB
(YC34)
Replace the drum unit C (see page 1-5-20).
Replace the engine PWB and check for cor-
rect operation (see page 1-5-26).
Code
7404
Contents
Developing unit Y non-
installing error
No density detection signal is
output from toner sensor Y in
developing unit Y.
Causes
Defective connec-
tor cable or poor
contact in the con-
nector.
Defective toner
sensor Y.
Defective engine
PWB.
7411 Drum unit K non- installing
error
The EEPROM of drum PWB K
does not communicate nor-
mally.
Installation of
incompatible drum
unit K.
Defective connec-
tor cable or poor
contact in the con-
nector.
Defective drum
PWB K.
Defective engine
PWB.
7412 Drum unit C non- installing
error
The EEPROM of drum PWB
C does not communicate nor-
mally.
Installation of
incompatible drum
unit C.
Defective connec-
tor cable or poor
contact in the con-
nector.
Defective drum
PWB C.
Defective engine
PWB.
1-4-26