Epson LQ-570+ 서비스 매뉴얼 - 페이지 21

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REV.-A

2.3 CONTROL CIRCUIT OPERATION

The control circuit consists of two boards: the C107 MAIN board, which acts as the main board, and

the C062 PNL board, which acts as the control panel board. This section describes how these boards

work.

2.3.1 Control Circuit Operation Ovewiew

The printer CPU is an 8-bit CPU TMP90C041 running at 10 MHz. It oversees control of all the

components of the printer. The E05A50 gate array contains various memory management ftinctions

that control the assignment of the memoty and l/O areas, and it controls a head gate array IC2

array for the head pins drive, several sensor circuits and so on.

Figure 2-17 shows the block diagram of the C107 Main Board.

C062PNL Board

-.. -.. —.. —..

GateArray

. . . . . . . . . .,

: Opdon I/F } . .

. . . . . . . . . . .

CPU TMP90C041 (IC21)

STK-6712(IC1O)

CR Motor

Head

CR Motor

PF Motor

DETECTOR ASSY.,PE,FRONT

DETECTOR ASSY.,PE,REAR

DETECTOR ASSY.,HP

DETECTOR ASSY.,PLATEN

TH2

C107MAIN Board

PROM

512K

PFMotor

DETECTOR ASSY.,

DETECTOR

: Paper Feed Motor

: Paper End Sensor(Front)

: Paper End Sensor(Rear)

: Home Position Sensor

: Platen Gap Sensor

: Release Lever Position Sensor

: Therrnister Sensor

Figure 2-17. Control Circuit Block Diagram

2-13

E05A66 (IC2)

RELEASE