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2.3.03 Power Supply Unit
The power supply unit generates the following voltages from the AC input voltage:
High Voltage Drive
The high voltage circuit provides the charge voltage (about -6 Kvdc), transfer voltage (about +5
Kvdc), grid voltage (about -600vdc), and developer bias voltages (about -550vdc and -400vdc). Of
these voltages, the charge voltage and the transfer voltage are generated by a high-voltage power
supply. The grid connects to ground via a varistor on the medium-voltage generation circuit. This
keeps the grid at about -680vdc during charging.
Low Voltage Circuit
This circuitry produces the following voltages:
+5 vdc: Printer Logic
+/- 12 vdc: Interface Signal Levels
+38 vdc: Resist/Main Motor Drive, Fan Drive
Copyright 1997, Okidata, Division of OKI America, Inc. All rights reserved. See the OKIDATA Business
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Service Guide OL830
Chapter 2 Principles of Operation
Page: 26
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Troubleshooting
