Kyocera ECOSYS FS-C5350DN, Service Manual, Page: 60 / 178

2K8
1-4-14
6020 Abnormally high temperature fuser
heater lamp
The fuser thermistor detects a tempera-
ture higher than 240
°
C/464
°
F.
By the activation of the high temperature
error detection circuit (230
°
C/446
°
F or
more) of fuser thermistor, the illumination
of fuser heater lamp was forcibly turned
off and 10 seconds has elapsed.
Shorted fuser ther-
mistor. Replace the fuser unit (See page 1-5-25).
Defective engine
PWB. Replace the engine PWB (See page 1-5-
29).
6030 Broken fuser thermistor wire
Input from fuser thermistor is 3 or less
(A/D value) continuously for 1.1 second
(11 ms
×
100 times).
Defective harness
between fuser ther-
mistor and paper
exit PWB (YC4), or
improper connec-
tor insertion. Reinsert the connector. Also check for conti-
nuity within the connector harness. If none,
remedy or replace the harness.
Defective harness
between paper exit
PWB (YC1) and
engine PWB
(YC20), or
improper connec-
tor insertion. Reinsert the connector. Also check for conti-
nuity within the connector harness. If none,
remedy or replace the harness.
Broken fuser ther-
mistor wire. Replace the fuser unit (See page 1-5-25).
Fuser thermistor
installed incor-
rectly. Replace the fuser unit (See page 1-5-25).
Fuser thermal cut-
out triggered. Replace the fuser unit (See page 1-5-25).
Fuser heater lamp
installed incor-
rectly. Replace the fuser unit (See page 1-5-25).
Broken fuser
heater lamp wire. Replace the fuser unit (See page 1-5-25).
Defective engine
PWB. Replace the engine PWB (See page 1-5-
29).
6400 Zero cross signal error
The zero cross signal does not reach the
engine PWB for specified time.
Defective harness
between power
source PWB
(YC103) and
engine PWB
(YC19), or
improper connec-
tor insertion. Reinsert the connector. Also check for conti-
nuity within the connector harness. If none,
remedy or replace the harness.
Defective power
source PWB. Replace the power source PWB (See page
1-5-26).
Defective engine
PWB. Replace the engine PWB (See page 1-5-
29).
Code Contents
Remarks
Causes Check procedures/corrective measures