2L6/2N6/2N5/2N4
1-4-152
7243 Broken developer thermis-
tor M wire
The sensor input sampling is
greater than 230.
Developer
thermistor M
1. Confirm Developing is displayed by
U139 temperature and humidity (see
page 1-3-98).
2. Confirm that the wiring connector is
firmly connected and, if necessary,
connect the connector all the way in.
Developer unit M and Front PWB (YC11)
Front PWB (YC2) and Engine PWB
(YC10)
3. If the wiring is disconnected, shorted or
grounded, replace the wiring.
4. Replace the Developer unit M (see page
1-5-57).
Front PWB Replace the front PWB
Engine PWB 1. Check the engine software and upgrade
to the latest, if necessary.
2. Replace the engine PWB (see page 1-5-
80).
7244 Broken developer thermis-
tor Y wire
The sensor input sampling is
greater than 230.
Developer
thermistor Y
1. Confirm Developing is displayed by
U139 temperature and humidity (see
page 1-3-98).
2. Confirm that the wiring connector is
firmly connected and, if necessary,
connect the connector all the way in.
Developer unit Y and Front PWB (YC15)
Front PWB (YC2) and Engine PWB
(YC10)
3. If the wiring is disconnected, shorted or
grounded, replace the wiring.
4. Replace the Developer unit Y (see page
1-5-57).
Front PWB Replace the front PWB
Engine PWB 1. Check the engine software and upgrade
to the latest, if necessary.
2. Replace the engine PWB (see page 1-5-
80).
Code Contents Related parts
Check procedures/
corrective measures
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