Apple ImageWriter II L Service Source.pdf

Service Source

ImageWriter II/L

Basics

Introduction - 1

Introduction

The electrical operation of

the printer consists of five

printed circuit boards,

three motors, and several

switches.

The boards are the power

supply board, main board,

sub PCB board, print head

board, and the operation

panel board.

Basics

Introduction - 2

The three motors are the

carrier motor, line feed

motor, and the ribbon

position motor.

Switches are the home

position switch, paper-out

sensor switch, and the

ribbon switch.

Basics

Power Supply - 3

Power Supply

The ImageWriter II/L has a

switching type power supply

that eliminates the need for

a bulky transformer. When

the input AC current is

applied to this board, the

power supply reduces and

rectifies the voltage to the

following DC voltages:

• + 5 V DC

• – 5 V DC

• + 26 V DC

Basics

Power Supply - 4

The + 5 and –5 V DC voltages

are for logic; the + 26 V DC

is for motor drive. All the

voltages are fed from

connector CN5 on the power

supply board to connector

CN3 on the main board.

From the main board the

voltages are distributed to

the other boards and motors.

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