Power Supply Unit; Mpw1446 (230V)/Mpw1546 (120V) Circuit Diagram - Oki OKIFAX4550 Maintenance Manual

6.

Power Supply Unit

6.1

MPW1446 (230V)/MPW1546 (120V) Circuit Diagram

IMPORTANT:
Oki Data Corporation recommends that maintenance of the Power supply unit (MPW1446 (230V)/
MPW1546 (120V)) be performed by replacement of a unit, not by replacement of components.
Therefore,
1) circuit descriptions in this section are for reference.
2) orders for components of the power supply unit cannot always be accepted.
Functions of unit:
The circuit generates the following direct currents (DC) based on the alternating current,
AC 120 V +6%, -15%
AC 230 V +15%, -14%
1. Low-voltage power supply circuit
This circuit generates the following voltages.
2. Input ratings
Output Voltage
+5V
-8V/+24V
+26V
• Voltage
• Frequency
3. Output ratings
Pin No.
CN003
2, 3
8
1
9
12
4. Block diagram
Figure A.32 shows a block diagram.
* The information contained herein can change without notice owing to product and/or technical
improvements.
41309401TH Rev.4
Logic circuit supply voltage (IC, LSI), and high-voltage source voltage
CIS (contact image sensor)
Send motor, drum motor and clutch
: AC 120 V +6%, -15% (AC 102 V to 127 V)
AC 230 V +15%, -14% (AC 198 V to 264 V)
: 50 Hz/60 Hz +/-2%
Rated Rated
Voltage Current
+5V 1.5V
+26V 1.3V
+24V 0.2V
-8V 0.1V
+5VS 20mA
Output Voltage
Current Voltage
Range Range
0.2~4.4A +4.9~+5.3V
0~1.3A +26~+40V
0~0.2A +22.8~+25.2V
0~0.1A -6.5~-12.0V
15~50mA +5.0~5.4V
Output Output
Ripple Noise
100mV 250mV
500mV
50mV 100mV
100mV 250mV
100mA 250mA
351 /