Kyocera TASKalfa 5551ci - Short-Circuited LSU Thermistor K; Short-Circuited LSU Thermistor C

2L6/2N6/2N5/2N4
1-4-149
7231 Short-circuited LSU therm-
istor K
The sensor input sampling is
less than 69.
LSU thermistor K
1. Confirm LSU 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.
Laser scanner unit and LSU relay PWB
(YC5)
LSU relay PWB (YC3) and Engine PWB
(YC12)
3. If the wiring is disconnected, shorted or
grounded, replace the wiring.
4. Replace the laser scanner unit (see
page 1-5-43).
LSU relay PWB Replace the LSU relay 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).
7232 Short-circuited LSU therm-
istor C
The sensor input sampling is
less than 69.
LSU thermistor C
1. Confirm LSU is displayed by U139
temperature and humidity (see page 1-
3-98).
2. Confirm that the wiring connector is
firmly connected and, if necessary, con-
nect the connector all the way in.
Laser scanner unit and LSU relay PWB
(YC10)
LSU relay PWB (YC3) and Engine PWB
(YC12)
3. If the wiring is disconnected, shorted or
grounded, replace the wiring.
4. Replace the laser scanner unit (see
page 1-5-43).
LSU relay PWB REPLACE the LSU relay 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