Engine Unit Reassembly - Canon PIXMA MX870 Service Manual

(10) Engine unit reassembly

After repair, reassemble each unit of the printer engine on the bottom case in the procedures listed below.
Depending on the replaced unit, some steps can be omitted. For specific part names and locations, refer to the Parts Catalog.
1) Install the switch system unit in the bottom case, and fasten the screws.
2) Attach the duplex print paper feed roller unit to the purge drive system unit, and fix them to the bottom case with the screws.
3) Attach the cassette feed guide.
4) Install the cassette feed roller unit.
5) Install the paper feed roller (LF roller) unit and attach the paper feed belt.
6) Attach the paper guide unit to the paper feed roller (LF roller), and attach the springs to each side of the guide unit. (Hook the
other end of each spring on the protrusion of the right and left plates respectively.)
7) Install the platen unit and the spur unit.
8) Connect the springs on each side of the spur holder to the switch system unit and the purge drive system unit respectively.
9) Fix the pressure roller unit to the main chassis (screw it to the right and left plates).
10) Attach the carriage unit and the carriage rail to align with the marks on the main chassis.
11) Hook the torsion springs of the pressure roller unit to the main chassis, then the springs kept at the right and left plates in step
6) to the main chassis.
12) While being cautious not to damage the carriage FFC, install the front chassis and the ground chassis.
13) Attach the ink sensor board to the front chassis.
14) Install the ASF unit and attach the PE sensor board.
15) Install the main PCB chassis.
16) Arrange each harness.
17) Attach the carriage encoder.
18) Install the logic board.
<3-2. Part Replacement Procedures>
44 / 63