Brother HL-1870N - Power Supply; Low-Voltage Power Supply

CHAPTER 3 THEORY OF OPERATION
3-16
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
(+3.3V, +7V [non regulated] 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 Production Code
+3.3V / 1.0A
+7V / 0.7A
+24V / 3.0A
100V: MPW1860
200V: MPW1760
For the circuit diagram of the low-voltage power supply PCB, see APPENDIX 11. or 12. LOW-
VOLTAGE POWER SUPPLY PCB CIRCUIT DIAGRAM in this manual.
Heater
Circuit
Thermal
Fuse
Feedback
Line
Filter
Fuse
Rectifier
Oscillator
24V
Regulation
Circuit
24V
3.3V
Lamp
(Heater)
(Engin Circuit / Main Circuit)
3.3V
Regulation
Circuit
Lightning
Surge
Absorber
Fuse
8V
Fig. 3-16