Adjustments; Adjustment Locations; Adjusting Registration; Checking And Adjusting The Head Gap - Canon QY8-1360-000 Service Manual

Part 5: Maintenance

5. ADJUSTMENTS

5.1 Adjustment Locations

5.1.1 Adjusting registration

Adjust the registration along the horizontal and vertical directions using the printer
driver. This adjustment is the same as the operation when the user installs the
printer or replaces the BJ cartridge. For details, see "Part 3: 1.3.3 3) Aligning the print
heads" (page 3-5) .

5.1.2 Checking and adjusting the head gap

Check that the head gap is correct when you have loosened the following screws, for
example during replacement of parts, or when the printer has been strongly impacted
for example by its being dropped.
This check is also necessary if the paper scrapes against the head during printing or
when color drifts frequently.
The head gap must be adjusted if it has deviated out of the allowable range of 1.2 to
1.6 mm.
The following tools are required for checking and adjusting the head gap.
Thickness gauge 1.2 mm (QY9-0016-000)
Thickness gauge kit (QY9-0030-000)
Adjustment knob (QY9-0031-000)
BJ cartridges (tester)
You can substitute the above thickness gages, if not available, with commercially
available ones capable of measuring 1.2 mm, 1.4 mm and 1.6 mm gaps.
1. Checking the Head Gap
Follow the procedure below to check the head gap.
1) Remove the AC adapter, top case and sheet feeder unit from the printer, and
make sure that the cartridge is locked. Attach both service BJ cartridges.
Also, disconnect the CR motor connector from the logic board. If the carriage is
moved manually with the CR motor still connected to the logic board, the
electromotive force of the motor may damage the logic board.
Figure 5-9 Screws Influencing Head Gap
Used for checking the head gap
Used for checking and adjusting the head gap
Used for adjusting the head gap
Prepare this as a special tool
5-8
BJ Head
1.2mm to 1.6mm
Paper
Head Gap
BJC-7100