Confidential
CHAPTER 3 THEORY OF OPERATION
This chapter gives an overview of the scanning and printing mechanisms as well as the sensors,
actuators, and control electronics. It aids in understanding the basic principles of operation as
well as locating defects for troubleshooting.
CONTENTS
3.1 OVERVIEW.............................................................................................................3-1
3.2 MECHANICAL COMPONENTS.................................................................................3-2
3.2.1 Scanner Mechanism......................................................................................3-5
3.2.2 Printing Mechanism.......................................................................................3-8
3.2.2.1 Ink supply and ink jet mechanism............................................................3-9
[ 1 ] Overview ..............................................................................................3-9
[ 2 ] Features.............................................................................................3-10
[ 3 ] Head/carriage unit ...............................................................................3-11
[ 4 ] Ink cartridges......................................................................................3-18
[ 5 ] Ink refill assembly................................................................................3-20
[ 6 ] Ink supply tubes ..................................................................................3-21
3.2.2.2 Head maintenance mechanism..............................................................3-22
[ 1 ] Overview ............................................................................................3-22
[ 2 ] Maintenance unit components...............................................................3-22
[ 3 ] Mechanisms constituting the head maintenance mechanism....................3-24
[ 4 ] Purge mechanism details .....................................................................3-29
3.2.2.3 Carriage drive mechanism....................................................................3-34
3.2.2.4 Paper pulling-in, registration, feeding and ejecting mechanisms...............3-38
3.2.3 Sensors and Actuators ................................................................................3-44
3.3 CONTROL ELECTRONICS....................................................................................3-47
3.3.1 Components ...............................................................................................3-47
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