OKIDATA ML393C Plus, Руководство по обслуживанию

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Service Guide ML393/ML393CPlus
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 Table
Voltage/Signal Purpose
+5 vdc IC Logic Levels - LED Drive Voltage
+8 vdc Serial Interface Logic Levels - Line Feed Motor Locking
Voltage
-8 vdc Serial Interface Logic Levels
+38 vdc Printhead Space Motor Line Feed Motor Bail/Ribbon
Motor Drive Voltage
POW ALM This signal is sent by 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) Refer to Section 4 of this Service Handbook.
ALM This signal is sent by the Main Control Board when an of
an overdrive condition is detected in either the printhead
line feed motor or bail/ribbon motor drive circuits. The
power supply disables the + 38 vdc output when this
signal is detected.