Brother International IntelliFax-3550 Service Manual - Page 47

Power Supply PCBs, The +5V source

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3.6 Power Supply PCBs [ 1 ] Low-voltage power supply PCB The low-voltage power supply uses the switching regulation system to generate DC power (+5V and +24V) from a commercial AC power supply for the driver circuits. The +5V source is fed to the logic, control panel, sensors, CCD unit, etc.; the 24V source is fed to the motors, solenoid, fans, LED array, and the high-voltage power supply PCB. The low-voltage power supply also feeds AC power to the heater of the fixing unit. (Heater) Fuse Lightning Surge Absorber Heater Circuit Thermal Fuse FU lamp Feedback Line Filter Rectifier Switching Circuit 24V Detector (Driver circuits) 24V 5V 5V Regulation Circuit Low-voltage Power Supply Circuit III - 28

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III –
28
3.6
Power Supply PCBs
[ 1 ]
Low-voltage power supply PCB
The low-voltage power supply uses the switching regulation system to generate DC power
(+5V and +24V) from a commercial AC power supply for the driver circuits.
The +5V source
is fed to the logic, control panel, sensors, CCD unit, etc.; the 24V source is fed to the motors,
solenoid, fans, LED array, and the high-voltage power supply PCB.
The low-voltage power supply also feeds AC power to the heater of the fixing unit.
Low-voltage Power Supply Circuit
Heater
Circuit
Thermal
Fuse
Lightning
Surge
Absorber
Feedback
Line
Filter
Fuse
Rectifier
Switching
Circuit
24V
Detector
5V
Regulation
Circuit
24V
5V
FU lamp
(Heater)
(Driver circuits)