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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)
Summary of Contents for MFC 4550
Page 5: ...CHAPTER I GENERAL DESCRIPTION ...
Page 14: ...CHAPTER II INSTALLATION ...
Page 15: ...CONTENTS 1 INSTALLING THE UPDATE DATA TO THE FACSIMILE EQUIPMENT II 1 ...
Page 18: ...CHAPTER III THEORY OF OPERATION ...
Page 49: ...CHAPTER IV DISASSEMBLY REASSEMBLY AND LUBRICATION ...
Page 81: ...CHAPTER V MAINTENANCE MODE ...
Page 89: ...V 7 Scanning Compensation Data List 200 dpi ...
Page 133: ...CHAPTER VI ERROR INDICATION AND TROUBLESHOOTING ...
Page 163: ...MAIN 8 8 FAX3550 3650 8000P 8200P MFC4550 6550MC 7550MC MFC9000 9500 A ...
Page 185: ...D CONTROL PANEL 1 2 ...
Page 187: ...E POWER SUPPLY 120 V Low voltage power supply ...
Page 188: ...E POWER SUPPLY 200 240 V Low voltage power supply European versions ...
Page 189: ...E POWER SUPPLY 200 240 V Low voltage power supply Asian versions ...
Page 190: ...E POWER SUPPLY High voltage power supply ...
Page 191: ...Sept 98 5X52012 Printed in Japan ...