Low-Voltage Power Supply - Brother HL-1440 Service Manual

CHAPTER 3 THEORY OF OPERATION
1.6 Power Supply
1.6.1

Low-voltage power supply

The power supply uses a switching regulation system to generate the regulated DC power
(+5V and +24V), which are converted from the AC line.
The regulated output and the production code of each power supply are listed below;
Regulated Output
+5V / 1.6 A
+24V / 2.15 A
For the circuit diagram of the low-voltage power supply PCB, see
Production Code
100V: MPW1555
200V: MPW1455
Fuse
Lightning
Surge
Absorber
Fuse
Line
Rectifier
Filter
Regulation
Regulation
Thermal
Fuse
Heater
Circuit
Feedback
Oscillator
24V
Circuit
5V
Circuit
Fig. 3-25
3-20
Appendix 20 or 21.
(Heater)
Lamp
(Engin Circuit)
24V
5V