E3-21 Dust Collection Fan Motor Rotation; E3-22 Exhaust Fan Motor Rotation; E3-23 Suction Fan Motor Rotation; E3-30 Discharge Lamp - Panasonic FP-7742 Service Manual

E3-21: Dust collection fan motor rotation
E3-22: Exhaust fan motor rotation
E3-23: Suction fan motor rotation
When the fan motor is rotated or stopped, fan motor rotation signal is/not detected.
Is DC24V detected on CN8-1, 2 or 7?
E3-30: Discharge lamp
When the discharge lamp does not turn ON, or the fan motor fails to rotate when the
power switch is turned ON.
Is the discharge lamp ON?
NO
Is DC24V detected on discharge lamp
connector CN-2?
YES
E3-40: Copy density sensor output adjustment
When the QUANTUM Function does operate, the white density output signal is not detected.
Is the copy density sensor dirty?
NO
Does the copy density sensor connector
insert securely?
YES
Is the drum installed securely?
NO
Does the LED array light?
YES
Is DC5V detected on CPU PCB
CN7-3 ? (QUANTUM function)
YES
Is voltage detected on CPU PCB
CN7-2 ?
YES
4-50
YES Fan motor connector is shorted or broken.
fan motor is defective
YES CPU PCB CN14-1 and 2 are shorted.
NO Check DC24V on CPU PCB CN14-2.
Discharge lamp terminal position is incorrect.
CPU PCB is defective.
YES Clean the copy density sensor.
NO Re-insert the sensor connector securely.
NO Install the drum securely.
NO Check the LED array connector is connected
correctly
NO Check other DC5V line.
NO Copy density sensor is defective.
Check all DC5V lines.