Panasonic FP-7818 Service Manual & Parts Manual page 124

E1-21: Mirror ratio drive
When the mirror stepping motor drives to the mirror home position sensor
and is not detected within a predetermined time.
Does the mirror unit move when the
power switch is turned ON?
YES
Is DC5V (output signal) detected on the
Mirror position sensor connector CN-1 ?
YES
Does CN11-2 (output signal of CPU PCB)
change when the home position sensor is turned
ON/OFF.
YES
E1-23: F8-02 mis-input
Measurement input for adjusting the
original registration
E1-32: Auto original density detection
When the auto original density signal is not detected, or the auto original density
can not be adjusted.
Is original density sensor dirty?
NO
Is DC10V signal detected on CN11-12 CPU
PCB?
NO
NO Mirror stepping motor connector is shorted or
broken.
CN-115 or CN-123 (of LVPS PCB) is shorted or
broken.
Mirror drive mechanism is defective.
Mirror stepping motor is defective.
CPU PCB is defective.
NO Is DC5V detected on the CN11-3 of the CPU
PCB?
YES: Home position sensor connector is
shorted or broken.
NO: Check all DC5V lines.
NO Home position sensor connector is shorted or
broken.
Home position sensor mounting position is
incorrect.
Home position sensor is defective.
CPU PCB is defective.
Input the average measurement correctly.
Adjust F8-01 and F8-02 again.
YES Clean the original density sensor.
YES Original density sensor connector is shorted or
broken.
Original density sensor is defective.
PCB is defective.
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