Panasonic FP-7818 Service Manual & Parts Manual page 133

E5-41: Registration timing control circuit abnormal
When the copier stops, the optics scan and registration drive start driving
or when the copier is operated, the optics scan and registration operating are
not driven within a predetermined time.
IC5 on CPU PCB is defective.
E5-42: Total counter connection
When the total counter is disconnected.
Is the total counter connector
inserted securely?
YES
E5-50: I/O Communication error
When an abnormal communication is detected.
Main CPU (IC5), paper feed driver, ADU driver or LCC driver is defective.
E6-03: Paper length home position detecting sensor
When the paper length motor drives to home position, paper length
home position detecting sensor is not sensed within a predetermined time.
Does the paper length motor rotate?
NO
Is DC+24V detected on CN653-4?
YES
5-56
NO Insert the total counter securely.
Total counter is defective.
Copier CPU PCB is defective.
YES Check paper length home position
detecting sensor output PSLSN(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 length motor is defective.
Duplex unit control PCB is defective.