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Service Guide ML520/521
Chapter 2 Principles of Operation
2.2 MECHANICAL 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
Copyright 1997, Okidata, Division of OKI America, Inc. All rights reserved. See the OKIDATA Business
Partner Exchange (BPX) for any updates to this material. (http://bpx.okidata.com)
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