Service manual

Service Call Conditions

SM 6-13 M052/M053/M054

Trouble-

shooting

622 D Paper tray unit communication error

623 D 2nd Paper tray unit communication error

624 D 3rd Paper tray unit communication error

- -

While the BICU communicates with an optional unit, an SC code is

displayed if one of following conditions occurs.

 The BICU receives the break signal which is generated by the

peripherals only just after the main switch is turned on.

 When the BICU does not receive an OK signal from a peripheral after

sending a command to it.

 Harness disconnected or broken

 BICU defective

 External noise

 Main board defective in the peripherals

641

CTL

BICU control data transfer abnormal

A sampling of the control data sent from the BCU reveals an

abnormality.

 Controller board defective

 External noise

 BCU board defective

Check the connection between the controller board and BICU.

Replace the controller board.

Replace the BICU.