Canon LBP 2460 Service Manual - Page 117

CHAPTER 2 IX. DUPLEXING UNIT A. Outline of the Electrical System The operation sequences of the duplexing unit are controlled by the duplexing driver PCB. This PCB utilizes a 4 bit microcomputer (CPU, IC2002) to control the serial communication between the duplexing unit and the DC controller PCB in the printer. The CPU drives the motors, solenoids and the clutch according to commands sent from the DC controller PCB to the duplexing unit and second-pass pick-up commands via serial communication. The duplexing unit is supplied with +24VDC from the printer. +5V is produced within the duplexing driver PCB for the ICs and sensors. The flow of signals between the duplexing unit and the printer are outlined in the figure below. Duplexing unit paper sensor PS21 Switchback sensor PS22 Side registration guide home position sensor PS23 Duplex feed roller 1 home position sensor PS24 CPU IC2002 Duplexing driver PCB Serial line +24VA DC controller PCB Printer SMT21 Switchback motor SMT22 Side registration motor SL21 Switchback roller release solenoid SL22 Duplex deflector solenoid CL21 Duplex feed cluch Figure 2-9-1 2 - 71