Oki ML521 manual Service Guide ML520/521

Page: 43

Service Guide ML520/521

Chapter 2 Principles of Operation

2.2MECHANICAL OPERATION 2.2.01 Printhead Mechanism

The printhead is a spring-charged, 9-pin printhead. It is attached to the carriage, which moves parallel to the platen. Electrically, the printhead is controlled by the main control board via the carriage cable and the space motor.

The printhead is composed of the following parts.

Wire Guide

Spring Assembly

Wire, Armature, Spring, Yoke, Spacer

Magnet Assembly

Magnet, Core, Coil, Yoke

Printed Circuit Board

Logic Control, Print Driver, Analog Sensor Control and Thermistor

Cooling Fin

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