E6-04 Paper Width Home Position Detecting Sensor; E6-05 Paper Detecting Sensor - Panasonic FP-7742 Service Manual

E6-04: Paper width home position detecting sensor
When the paper width motor drives to home position, paper width
home position detecting sensor is not sensed within a predetermined time.
Does the paper width motor rotate?
NO
Is DC+24V detected on CN653-7?
YES
E6-05: Paper detecting sensor
When paper is in the duplex unit tray, but it is not detected.
Does CN-2(DXPESN) output level
change when the duplex unit tray
sensor is turned ON/OFF?
YES
YES Check paper width home position
detecting sensor output PSWSN(CN-2)
Changed: Duplex unit control PCB is defective.
Not changed: Check DC+5V on CN-1.
Detected: Check sensor.
Not detected: Check DC+5V line.
NO Check DC+24V line.
Paper width motor is defective.
Duplex unit control PCB is defective.
NO Check DC+5V on sensor.
Detected: Check sensor.
Not detected: Check DC+5V line.
Duplex unit control PCB is defective.
Copier CPU PCB is defective.
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