Outline Of The Electrical Circuitry - Canon NP7160 Service Manual

CHAPTER 2 BASIC OPERATION
B. Outline of the Electrical Circuitry
The copier's major electrical mechanisms are controlled by the microprocessor on the DC
controller PCB. The ICs on the DC controller PCB are shown below.
IC121 (ROM)
• Controls copying sequence.
JC113 (gate array)
• Controls scanning lamp (LA1) error detection.
• Controls thermistor (TH1, TH2) error detection.
• Controls triac short circuit error detection.
• Controls power at time of error.
• Turns on/off the scanning lamp (LA3).
• Controls the I/O port.
IC114 (IPC; NP7161 only)
• Controls communication with the ADF and the sorter.
JC116 (RAM)
• Records settings data (service mode, etc.).
IC117 (RESET IC)
• Resets at power-on.
Figure 2-102 is a block diagram showing the relationship between the copier's major circuits.
Reference:
The NP7161 possesses a communications IC (IPC) on its DC controller PCB. The copier
communicates with the ADF and the sorter using the communications IC on each controller
PCB (IPC communication) and the communications PCB on the DC controller PCB (IPC
communication 2).
2–2
COPYRIGHT © 1998 CANON INC. CANON NP7161/NP7160 REV.0 AUG. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON)