Power Supply Circuit - OKIDATA ML590 Service Manual

2.1.09 Power Supply Circuit

The switching type power supply circuit supplies the +5 vdc, +/-8 vdc, +12 vdc and +40 vdc.
Table of Output Voltages
Voltage / Signal
+5 vdc
+8 vdc
-8 vdc
+12 vdc
+40 vdc
ALM
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Purpose
IC logic levels LED drive voltages
Serial interface line voltage comparator IC
Serial interface line voltage
Printhead analog circuit
Printhead space motor and line feed motor drive voltage
Output from the main control board upon detection of an
abnormality in the printhead head gap or color ribbon drive circuits.
This signal will cause all DC voltages to be turned off.
Service Guide ML590/ML591
Chapter 2 Principles of Operation
Page: 67