Ricoh B132 Service Manual page 456

SERVICE CALL CONDITIONS
SC680 D BCU-MUSIC communication error
The main CPU fails to
communicate with the MUSIC
CPU within 5 sec. and three
attempts failed.
SC687 D Memory address command error
The BCU does not receive a
memory address command from
the controller 120 seconds after
paper is in the position for
registration.
B132/B200
• Toner cartridge ID chip harness
disconnected, defective
• Toner cartridge ID chip defective
• Toner cartridge installed incorrectly
• Toner cartridge defective
• UART communication failure; replace the
BCU
• BCU-Controller connection loose,
defective
• BCU defective
• Controller defective
4-56 SM