Oki OL1200 Service Manual page 150

F4 BG program error
F5 System timer program error
Defect in the cable for the front feeder
paper sensor and the 2-pin connector of the
Control board.
Poor connection of connectors
F6 IPT2 program error
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Turn the power off, then on.
Replace the Control board.
Note: When replacing the Control board,
install the EEPROM mounted on the replaced
Control board
Turn the power off, then on.
Repair defective front feeder paper sensor
cable and 2-pin connector on the Control
board or remove/insert the connectors.
Replace the Control board.
Turn the power off, then on.
Replace the Main board (AOLM-PCB).