III –
23
3.3
Relay PCB
1
4
6
7
8
9
Relay PCB Circuit Diagram
1
Connector for the main PCB
2
Registration sensor (PC1) circuit
3
Sheet feeder cover sensor (PC2) circuit
4
Cover switch (SW1)
5
Connector for the high-voltage power supply PCB
6
Connector for the toner sensor PCB
7
Connector for the laser diode of the laser unit
8
Switching circuit which feeds 24V power to the polygon motor during the printing pro-
cess.
9
Connector for the polygon motor
5
2
3
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 ...