E3-50 Transfer Cleaner Operation; E4-01 Fuser Warm-Up - Panasonic FP-7742 Service Manual

E3-50: Transfer cleaner operation
When the transfer cleaner motor drives, the transfer cleaner home position sensor
is not ON/OFF within a predetermined time.
Is the wire cleaner felt
at the home position sensor?
YES
Is DC5V detected on sensor CN-1?
YES
Does CN4-5 (output signal of control
panel CPU PCB) change when the
sensor is turned ON/OFF?
E4-01: Fuser warm-up
When the fuser temperature does not reach the predetermined level
within a predetermined time.
Does fuser lamp turned ON after
the power switch is turned on?
NO
Is these continuity between
CN-1 and 2 when the
AC driver PCB CN203 is removed.
YES
Is there some registrance between
CNTH-1 and 2 approximately few MΩ,
whenCPU PCB CN7 is removed.
(approx. 1.4MΩ/77F, 25°C)
NO Does the wire cleaner felt connect to
the corona rail slider?
a) Turn the transport lever and lower the
transport unit
b) Press down the transfer charger and draw it
toward you.
c) Slide the wire cleaner felt to rear side until it
stops.
d) Re-install the transfer charger.
e) Turn the transport lever and raise the
transport unit.
f) Check the wire cleaner felt is connected to
the corona rail slider.
Check operation
NO Sensor connector is shorted or broken.
NO Sensor is defective
YES Fuser thermistor is dirty.
Sensor position is incorrect.
Fuser temperature is low (re-adjust F6-31)
Fuser thermistor is defective.
NO Fuser lamp connector is shorted or broken.
Fuser thermostat is defective.
Fuser lamp is defective.
NO CNTH connector is shorted or broken.
Fuser thermistor is defective.
NO
YES
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