The Exposure Lamp Does Not Turn Off; Fixing Heater M Or S Does Not Turn On (C620) - Kyocera Mita KM-4230 Service Manual

Problem
(28) Defective inverter
The exposure PCB.
lamp does not
turn off.
Defective scanner
motor PCB.
(29) Broken wire in fix-
Fixing heater ing heater M or S.
M or S does
Fixing unit
not turn on
thermostat trig-
(C620).
gered.
Broken fixing unit
thermistor wire.
(30) Dirty sensor part of
Fixing heater the fixing unit ther-
M or S does mistor.
not turn off
Defective engine
(fixing unit
PCB.
thermostat
triggered;
C620).
Broken main
(31)
charger wire.
Main charging
is not per-
Leaking main
formed
charger housing.
(C510).
Poor contact in the
high-voltage
transformer PCB
connector
terminals.
Defective main
PCB.
Defective engine
PCB.
Defective high-
voltage trans-
former PCB.
Causes Check procedures/corrective measures
If the exposure lamp does not turn off with
CN1-5 and CN1-6 on the inverter PCB high,
replace the inverter PCB.
If CN3-1 and CN3-2 on the scanner motor
PCB are always low, replace the scanner
motor PCB.
Check for continuity across each heater. If
none, replace the heater (see page 3-3-63).
Check for continuity across thermostat. If
none, remove the cause and replace the
thermostat.
Measure the resistance. If it is
the fixing unit thermistor.
Check visually and clean the thermistor sen-
sor parts.
If fixing heater M/S stays on while CN6-7
and CN6-8 on the engine PCB go high,
replace the engine PCB.
See page 3-6-5.
2A3/4
, replace
3-6-81