Brother MFC4820C Service Manual page 3

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