Brother HL-7050 Service Manual page 101

CHAPTER 3 THEORY OF OPERATION
1.3 Engine PCB
The engine PCB controls the following parts by using signal data that the CPU (8 bit M38869)
obtains through correspondence with the main PCB. The engine PCB also corresponds with
the optional parts to give operational commands to the CPU.
Main motor
Fan motor
Thermistor
Polygon motor
Paper feed motor
Paper feed solenoid
Multi paper tray solenoid
Registration clutch
High-voltage power supply
Release motor
Release home position
sensor
Feeder clutch
For the entire circuit diagram of the engine PCB, see
CIRCUIT DIAGRAM,
1.4 Power Supply
1.4.1 Low-voltage power supply
The power supply uses a switching regulation system to generate the regulated DC power
(+3.3V, +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
+3.3V / 3.0A
+5V / 1.5A
+24V / 7.8A
For the circuit diagram of the low-voltage power supply PCB, see
VOLTAGE POWER SUPPLY PCB CIRCUIT DIAGRAM,
Cover open sensor
Pre-registration sensor
Registration sensor
Multi purpose tray paper empty sensor
Tray paper empty sensor
Face up open sensor
Full stack sensor
Fuser exit sensor
Eject sensor
Paper size sensor
Tray ID sensor
Developer clutch
HL-7050'.
Production Code
100V: MPS3516
200V: MPS3416
3-6
APPENDIX 11 to 13 'ENGINE PCB
APPENDIX 14, 15 'LOW-
HL-7050'.