2HA/2HB
1-4-19
C6400 Zero-crossing signal problem
The engine PWB does not detect the
zero-crossing signal for the time speci-
fied below.
At power-on: 3 s
Others: 5 s
Poor contact in the
connector termi-
nals.
Reinsert the connector. Also check for conti-
nuity within the connector cable. If none,
remedy or replace the cable.
Defective power
supply PWB.
Check if the zero-crossing signal is output
from YC2-5 on the power supply PWB. If
not, replace the power supply PWB.
Defective engine
PWB.
Replace the engine PWB if C6400 is
detected while YC2-5 on the power supply
PWB outputs the zero-crossing signal.
C7750 Drum type mismatch problem A
The drum type does not mach with the
software.
Defective software
of the engine PWB.
Rewrite the software of the engine PWB.
Defective engine
PWB.
Replace the engine PWB and check for cor-
rect operation.
C7760 Drum type mismatch problem B
The drum type is undefined.
Defective software
of the engine PWB.
Rewrite the software of the engine PWB.
Defective engine
PWB.
Replace the engine PWB and check for cor-
rect operation.
C7800 Broken external temperature ther-
mistor
The input voltage is 0.5 V or less.
Poor contact in the
humidity sensor
connector termi-
nals.
Reinsert the connector. Also check for conti-
nuity within the connector cable. If none,
remedy or replace the cable.
Defective humidity
sensor.
Replace the drawer PWB and check for cor-
rect operation.
C7810 Short-circuited external temperature
thermistor
The input voltage is 4.5 V or more.
Poor contact in the
humidity sensor
connector termi-
nals.
Reinsert the connector. Also check for conti-
nuity within the connector cable. If none,
remedy or replace the cable.
Defective humidity
sensor.
Replace the drawer PWB and check for cor-
rect operation.
Code Contents
Remarks
Causes Check procedures/corrective measures
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