Canon 3260 manual II. Engine Control System, DC Controller Circuit Outline

CHAPTER 2

II.ENGINE CONTROL SYSTEM

A.DC Controller Circuit

1. Outline

Operation sequences of the printer are controlled by the CPU of this circuit. When DC power is supplied from the power supply by turning ON the power switch of the printer and the printer enters the standby mode, the CPU outputs the signals that drive the loads such as laser diode, motors, and solenoids, based on the print start command and image data.

2. Explanation of operations of each block a. CPU (IC201)

An 8-bit single chip microcomputer (UPD78056) by NEC is used.

The CPU is a one-chip type in which ROM and RAM are built in, and controls the operation of the engine according to the control program stored in the ROM.

b.Gate array (IC202) Its functions are to:

1)control the laser/scanner,

2)control the video interface,

3)communicate with the envelope feeder,

4)communicate with the printer driver tester, and

5)operate as the expansion I/O.

Video controller

Serial line

Option controller

DC controller

Serial line

IC 202
Gate array	I/O

Bus

Serial line

Serial line

IC 201

I/O

CPU

Envelope feeder

Duplex unit

Figure 2-2-1

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