Kyocera TASKalfa 220 Service Manual page 128

2KL/2KK
Code
C6050 Abnormally low fuser thermistor tem-
perature
Fuser thermistor remains below 90°C/
194°F for 1 s.
C6400 Zero-cross signal error
Interrupt of the zero-cross signal does
not occur more than 1 s.
C7800 Broken external thermistor wire
The thermistor output value is 0.5 V or
less.
C7810 Short-circuited external thermistor
wire
The thermistor output value is 4.5 V or
more.
1-4-20
Contents
Causes Check procedures/corrective measures
Poor contact in the Reinsert the connector. Also check for conti-
fuser thermistor nuity within the connector cable. If none,
connector termi- remedy or replace the cable.
nals.
Measure the resistance. If it is ∞ Ω, replace
Broken fuser ther-
mistor wire. the fixing thermistor.
Fuser thermistor Check and reinstall if necessary.
installed incor-
rectly.
Fuser thermostat Check for continuity. If none, replace the
triggered. fuser thermostat.
Fuser heater Check and reinstall if necessary.
installed incor-
rectly.
Broken fuser Check for continuity. If none, replace the
heater wire. fuser heater.
Poor contact in the Reinsert the connector. Also check for conti-
connector termi- nuity within the connector cable. If none,
nals. remedy or replace the cable.
Defective power Check if the zero-crossing signal is output
source PWB. from YC2-2 on the power source PWB. If
not, replace the power source PWB.
Defective main/ Replace the main/engine PWB if C6400 is
engine PWB. detected while YC2-2 on the power source
PWB outputs the zero-crossing signal.
Poor contact in the Reinsert the connector. Also check for conti-
connector termi- nuity within the connector cable. If none,
nals. remedy or replace the cable.
Defective humidity Replace the cassette PWB and check for
sensor. correct operation.
Poor contact in the Reinsert the connector. Also check for conti-
connector termi- nuity within the connector cable. If none,
nals. remedy or replace the cable.
Defective humidity Replace the cassette PWB and check for
sensor. correct operation.
Remarks