Panasonic FP-7818, Service Manual & Parts Manual

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(1) U0: Key counter failure or Access code number was not input
*The copier does not indicate READY TO COPY when the key is inserted.
Is the key inserted correctly? NO Re-insert the key.
YES
Is CN119-2 connected to CN-2? NO CN119-2, 4 of the CPU is defective.
or
Is CN119-4 contact to CN-4?
YES
The key counter connection is defective.
*Access code number was not input.
Input access code number.
(2) U1: Front cover failure
*The copier does not indicate READY TO COPY when the front cover is closed.
Is the front cover closed securely? NO Close the front cover securely.
YES
Is DC24V detected on CN851-1,2 NO The CN851 and CN205 (of AC driver PCB)
(of LVPS PCB) when the front cover is connectors are defective.
opened and closed? The CN16 (of CPU PCB) is disconnected
(3) U4: Sorter failure (option)
*The copier does not indicate READY TO COPY when the sorter is installed.
Is the sorter closed securely? NO Close the sorter securely.
YES
Does J3-5 (output signal of Sorter CPU) NO Adjust the sorter interlock switch of sorter.
change when the sorter interlock The sorter interlock switch is defective.
switch is turned ON and OFF? (Refer to sorter service manual.)
(4) U5: Duplex unit failure
*The copier does not indicate READY TO COPY when the duplex unit is installed.
Is the duplex unit tray inserted NO Insert the duplex unit tray securely.
securely? YES
Does CN2-19, 20, 21 (output signal of NO Check DC5V of tray detecting sensor.
CPU) change when duplex unit tray Detected: Tray detecting sensor defective.
is removed and installed? Not detected: Check all DC5V lines.