Canon iPF720 Service Manual page 123

b. Installing the carriage belt
Install the carriage belt[2] with its complete set of teeth engaged with carriage belt stopper[1].
c. Action following the replacement of the carriage unit/multi sensor
Because the distance between the multi sensor (in the carriage unit) and the nozzles (in the printhead) is varied from one unit to another, the printer as shipped has
its optical axis corrected to adjust the image write position. When the carriage unit or multisensor has been replaced or disassembled and reassembled, they require
adjustment.
Execute service mode under the following conditions:
* The multi sensor reference plate(QL2-1738-000:BASE, MULTI SENSOR REFERENCE) must be replaced at the same time whenever the carriage or the multi
sensor is being replaced.
- Service mode : SERVICE MODE > ADJUST > GAP CALIB.
- Service mode : SERVICE MODE > ADJUST > PRINT PATTERN > OPTICAL AXIS
Media type : Photo glossy paper
Media size : Media having a width equal toor larger then that of A2-size paper
d. Removing the head holder
(1) Drain the printer of inks. See Disassembly/Reassembly > Tips on Disassembly/Reassembly > Ink Drain.
(2) Switch off the printer and move the carriage to above the platen. See Disassembly/Reassembly > Tips on Disassembly/Reassembly > Open Cap/Shift Wiper
Unit.
(3) Remove the shaft cleaner, tube holder cover and tube holder.
(4) Remove the printhead.
(5) Disconnect all connectors from the carriage relay PCB.
(6) Release the two flexible cables from the carriage claws (to prevent the elevation and defective contact of the flexible cable on the head holder side).
(7) Remove the printhead fixer lever assembly.
(8) Cover the printhead-side joint of the ink tube unit in a plastic bag or the like to prevent ink splashing and leakage, and seal the mouth of the bag.
[1]
[2]
F-4-23
F-4-24
Chapter 4
4-13