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Service Guide ML395/395C
Chapter 2 Principles of Operation
2.1.10 Power Supply
This switching power supply converts the AC input voltage to +5 vdc, +/-8 vdc and +38 vdc for use
throughout the printer.
Voltage/Signal Purpose
+5 vdc IC Logic Levels - LED Drive Voltage
+8 vdc Serial I/F Logic Levels - LF Motor Locking Voltage
-8 vdc Serial I/F Logic Levels
+38 vdc Printhead Space Motor LF Motor Bail/Ribbon Motor Drive Voltage
POW ALM Output from the Power Supply in the event of an abnormal temperature rise
in the power supply unit or an overcurrent condition of the +38 vdc. The
Main Control Board suppresses this condition by temporarily suspending
printing. If the condition does not change the Main Control Board will
enable the FAN ALARM (Alarm 60) See Section 4
ALM Output from the Main Control Board upon detection of an overdrive
condition in the printhead LF motor or bail/ribbon motor drive circuits.
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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