Brother International HL 1240 Service Manual - Page 56
Main PCB, Engine, Laser Unit, Fixing Unit, Drum Unit - drum light
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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) HighVoltage Power Supply PCB Cover Sensor (B) Drum Unit Primary Charger (Corona Wire) Primary Charger (Grid) Development Roller Supply Roller Transfer Roller Solenoid Fan Motor Main Motor Toner Sensor PCB (light emission) Toner Sensor PCB (light reception) Thermistor (for Heat Roller) Panel PCB Cover Sensor (A) Fig. 3-22 3-18
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CHAPTER 3
THEORY OF OPERATION
3-18
Laser
Main PCB
Engine
PCB
Polygon Motor
Laser Unit
Cover Sensor (A)
Main Motor
Solenoid
Fan Motor
Toner Sensor PCB (light emission)
Toner Sensor PCB (light reception)
Thermistor (for Heat Roller)
Panel PCB
Low-Voltage
Power Supply
PCB
Fixing Unit
Halogen
Heater
Lamp
Front Registration
Sensor
Rear Registration
Sensor
Upper Paper
Cassette Sensor
(HL-1250)
Lower Paper
Cassette
Registration Sensor
(HL-1250)
High-
Voltage
Power
Supply
PCB
Drum Unit
Primary Charger (Corona Wire)
Primary Charger (Grid)
Supply Roller
Transfer Roller
Development Roller
Cover Sensor (B)
Fig. 3-22