Power Supply; Voltage / Signal Table - OKIDATA Pacemark 3410 Service Handbook

2.1.10

Power Supply

This switching power supply converts the AC input voltage to +5vdc, +/-8vdc and +38 vdc for
use throughout the printer.

Voltage / Signal Table

Voltage/Signal
+5 vdc
+8 vdc
-8 vdc
+38 vdc
POW ALM
ALM
Pacemark 3410
IC logic Levels - LED Drive Voltage
Serial Interface logic Levels - Line Feed Motor Locking Voltage
Serial Interface logic Levels
Printhead, Space Motor, Line Feed Motor, Bail Motor Drive Voltage
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 logic board
suppresses this condition by temporarily suspending printing. If the condition does
not change, the main logic board will enable the FAN ALARM.
Refer to Section 4 - Failure Analysis
Input from the main logic board upon detection of an overdrive condition in the
printhead, line feed motor or bail motor drive circuits. Upon detecting this signal, the
power supply disables the +38 vdc output.
2 - 11
Purpose
2-J.pcx
Principles of Operation