Kyocera FS-9120DN Service Manual page 5

Code
4200 BD steady-state problem
• While the polygon motor is on, a BD
error is detected three times continu-
ously at 200 ms intervals.
5300 Broken cleaning lamp wire
While the cleaning lamp is on, the bro-
ken cleaning lamp wire detection signal
is detected for 2 s continuously.
6000 Broken fuser heater wire
• When the power is turned on or at the
start of fuser unit control from the
sleep mode, 10 s after fuser heater M
is turned on, the detected tempera-
ture of fuser unit thermistor 2 is lower
than 40 °C/104 °F.
6020 Abnormally high fuser unit ther-
mistor temperature
• Fuser unit thermistor 1 detects tem-
perature 250 °C/482 °F or higher.
• Fuser unit thermistor 2 detects tem-
perature 220 °C/428 °F or higher.
Abnormally low fuser unit thermistor
6050
temperature
• When only fuser heater M is on, fuser
unit thermistor 2 detects temperature
lower than 80 °C/176 °F during print-
ing.
• When fuser heater M and fuser unit
heater S are on, fuser unit thermistor
2 detects temperature lower than 80
°C/176 °F or fuser unit thermistor 1
detects temperature lower than 100
°C/212 °F during ptinting.
• The detection history of "6050" is
stored. If "6050" is detected several
times continuously, when the power
switch is turned on next, "6050" is im-
mediately displayed and the machine
stops.
(Method of clearing: See P.1-5-15.)
Contents
Causes Check procedures/corrective measures
Defective laser Replace the LSU (see page 1-6-11).
diode.
Defective polygon Replace the LSU (see page 1-6-11).
motor.
Defective engine Replace the engine controller PWB and
controller PWB. check for correct operation.
Defective cleaning Replace the cleaning lamp.
lamp.
Defective engine Replace the engine controller PWB and
controller PWB. check for correct operation.
Poor contact in Check the connection of connector YC10
the fuser unit ther- on the engine controller PWB and the con-
mistor 1 or 2 con- tinuity across the connector terminals. Re-
nector terminals. pair or replace if necessary.
Fuser unit ther- Check and reinstall if necessary.
mistor 1 or 2 in-
stalled incorrectly.
Fuser unit thermo- Check for continuity. If none, replace the
stat triggered. fuser unit thermostat.
Fuser heater M or Check and reinstall if necessary.
S installed incor-
rectly.
Broken fuser Check for continuity. If none, replace the
heater M or S fuser heater M or S (see page 1-6-20).
wire.
Shorted fuser unit Measure the resistance. If it is 0 Ω, replace
thermistor 1 or 2. the fuser unit thermistor 1 or 2 (see page
1-6-22).
Broken fuser unit Replace the power supply unit.
heater control cir-
cuit on the power
supply unit.
Poor contact in Check the connection of connector YC10
the fuser unit ther- on the engine controller PWB and the con-
mistor 1 or 2 con- tinuity across the connector terminals. Re-
nector terminals. pair or replace if necessary.
Broken fuser unit Measure the resistance. If it is ∞ Ω, replace
thermistor 1 or 2 the fuser unit thermistor 1 or 2 (see page
wire. 1-6-22).
Fuser unit ther- Check and reinstall if necessary.
mistor 1 or 2 in-
stalled incorrectly.
Fuser unit thermo- Check for continuity. If none, replace the
stat triggered. fuser unit thermostat.
Fuser heater M or Check and reinstall if necessary.
S installed incor-
rectly.
FS-9120DN/9520DN
Remarks
1-5-21