Brother HL 1240 - B/W Laser Printer Service Manual page 56

CHAPTER 3 THEORY OF OPERATION
Main PCB
Low-Voltage
Power Supply
PCB
Fixing Unit
Halogen
Heater
Lamp
Laser Unit
Laser
Polygon Motor
Engine
PCB
Front Registration
Sensor
Rear Registration
Sensor
Upper Paper
Cassette Sensor
(HL-1250)
Lower Paper
Cassette
Registration Sensor
(HL-1250)
Solenoid
Fan Motor
Main Motor
Toner Sensor PCB (light emission)
Toner Sensor PCB (light reception)
Thermistor (for Heat Roller)
Panel PCB
Fig. 3-22
3-18
Cover Sensor (B)
Drum Unit
Primary Charger (Corona Wire)
High-
Primary Charger (Grid)
Voltage
Power
Development Roller
Supply
PCB
Supply Roller
Transfer Roller
Cover Sensor (A)