2MN/2N1
1-4-64
7242 Broken developer thermis-
tor C wire
The sensor input sampling is
greater than 230.
Defective connec-
tor cable or poor
contact in the con-
nector.
Reinsert the connector. Also check for conti-
nuity within the connector cable. If none,
replace the cable.
Developer unit C and front PWB (YC13)
Front PWB (YC2) and engine PWB (YC10)
Defective devel-
oper thermistor C.
Replace developer unit C (see page 1-5-29).
Defective engine
PWB.
Replace the engine PWB and check for cor-
rect operation (see page 1-5-49).
7243 Broken developer thermis-
tor M wire
The sensor input sampling is
greater than 230.
Defective connec-
tor cable or poor
contact in the con-
nector.
Reinsert the connector. Also check for conti-
nuity within the connector cable. If none,
replace the cable.
Developer unit M and front PWB (YC11)
Front PWB (YC2) and engine PWB (YC10)
Defective devel-
oper thermistor M.
Replace developer unit M (see page 1-5-
29).
Defective engine
PWB.
Replace the engine PWB and check for cor-
rect operation (see page 1-5-49).
7244 Broken developer thermis-
tor Y wire
The sensor input sampling is
greater than 230.
Defective connec-
tor cable or poor
contact in the con-
nector.
Reinsert the connector. Also check for conti-
nuity within the connector cable. If none,
replace the cable.
Developer unit Y and front PWB (YC15)
Front PWB (YC2) and engine PWB (YC10)
Defective devel-
oper thermistor Y.
Replace developer unit Y (see page 1-5-29).
Defective engine
PWB.
Replace the engine PWB and check for cor-
rect operation (see page 1-5-49).
7251 Short-circuited developer
thermistor K
The sensor input sampling is
less than 69.
Defective connec-
tor cable or poor
contact in the con-
nector.
Reinsert the connector. Also check for conti-
nuity within the connector cable. If none,
replace the cable.
Developer unit K and front PWB (YC9)
Front PWB (YC2) and engine PWB (YC10)
Defective devel-
oper thermistor K.
Replace developer unit K (see page 1-5-29).
Defective engine
PWB.
Replace the engine PWB and check for cor-
rect operation (see page 1-5-49).
Code Contents Causes
Check procedures/
corrective measures
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