Brother MFC-8220 - Low-Voltage Power Supply; Power Supply

MFC-8220
SERVICE MANUAL
3-11
1.5 Power Supply
1.5.1 Low-voltage power supply
The power supply uses a switching regulation system to generate the regulated DC power
(+3.3V, +8V [non regulated] and +24V), which are converted from the AC line.
The regulated output is listed below;
Regulated Output
+3.3V / 1.5A
+8V / 0.7A
+24V / 2.9A
For the circuit diagram of the low-voltage power supply PCB, see APPENDIX 4.12 ‘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. 3-17