Appendix A: Board Descriptions; Preface; Service Caution - Oki OKIOFFICE44 Service Manual

Appendix A: Board Descriptions

PREFACE

This appendix provides basic information concerning the electric section for the component-level
maintenance of the OKIOFFICE 44. It includes such information which will help maintenance personnel
to understand the circuit operations.
This appendix will also provide the reader information concerning the functions of units and the relation-
ships among the units which will assist you in conducting unit-level maintenance.

Service Caution

The High Voltage Power Supply Unit in the OKIOFFICE 44 is mounted vertically
on the left side of the unit, with the land side fully exposed. This board develops
voltages of up to 1300 VDC as part of the normal printing process.
OKIDATA recommends that the unit be powered OFF (AC supply cord discon-
nected) before removing the Main Cover for service. In the event that it is neces-
sary to troubleshoot the unit with the Main Cover removed, with AC power sup-
plied, please take every caution to avoid touching the exposed circuitry of the
High Voltage Power Supply Unit. To do so accidentally can result in a shock
hazard.
Do Not
Touch !
HIGH VOLTAGE
Board Descriptions
DANGER
You may be subjected to high-voltage electric shock by touching the
following parts without an insulating material:
a. High-voltage unit
b. Contact ass'y
A - 1 OKIOFFICE 44
Service Manual, P/N 59276801