E3-01 Toner Bottle Motor Rotation; E3-03 Toner Density Sensor Gain - Panasonic FP-7742 Service Manual

E3-01: Toner bottle motor rotation
When the toner bottle motor drives to the toner bottle position and the
toner bottle home position sensor is not detected.
Does the toner bottle motor rotate
in manual toner addition mode?
YES
Is DC5V detected on the bottle home
position sensor connector SN10-1 ?
YES
Does CN104-5 (signal of CPU PCB)
or CN401-11 (of control panel CPU PCB)
change when the toner bottle home position
. sensor is turned ON/OFF?
YES
E3-03: Toner density sensor gain
When the toner density gain is adjusted, toner density sensor standard signal level is not detected.
Is DC24V detected on toner density
sensor connector CN-2 ?
YES
Is the toner density sensor signal
detected on CPU PCB CN7-8 ?
YES
Is toner density level standard
(3.5% +/-0.5)?
YES
4-48
NO Bottle motor connector is shorted or broken
Bottle motor drive mechanism is defective.
Bottle motor is defective.
AC driver PCB is defective.
CPU PCB is defective.
NO Is DC5V detected on control panel CN401-13 ?
YES: Bottle motor home position sensor
connector is shorted or broken.
NO: Check all DC5V lines.
NO Bottle motor home position sensor connector
is shorted or broken.
Sensor mounting position is incorrect
Bottle motor home position sensor is defective.
Harness is defective. (between control panel
CPU and main CPU PCB)
CN401 is shorted or broken (on control panel
CPU PCB).
CPU PCB is defective.
NO Check DC24V of CPU PCB CN7-7.
NO Is DC24V detected on CPU PCB CN7-7 ?
YES: Toner density sensor is defective.
NO: Toner density sensor connector is shorted
or broken.
NO Replace the developer material and re-adjust
the toner density.
CPU PCB is defective.