Brother MFC-4820C Service Manual - Page 3

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Brother MFC-4820C Service Manual
CHAPTER 4 THEORY OF OPERATION
4.1
OVERVIEW ......................................................................................................................4-1
4.2
MECHANISMS .................................................................................................................4-2
4.2.1
Document Scanner Mechanism ...........................................................................4-4
4.2.2
Paper Feeding Mechanism ..................................................................................4-6
4.2.2.1
Auto Sheet Feeder (ASF) mechanism .........................................................4-7
4.2.2.2
Paper feeding and ejection mechanism.......................................................4-9
4.2.3
Printing mechanism............................................................................................4-11
4.2.3.1
Ink supply and ink jet mechanism ..............................................................4-12
4.2.3.2
Head cap mechanism ................................................................................4-21
4.2.3.3
Purging mechanism ...................................................................................4-22
4.2.3.4
Carriage drive mechanism .........................................................................4-29
4.2.4
Sensors and Actuators .......................................................................................4-31
4.3
CONTROL ELECTRONICS...........................................................................................4-34
4.3.1
Configuration ......................................................................................................4-34
CONTENTS