Canon MultiPASS C50 Service Manual page 131

(10) Loosen screw B until the carriage guide frame moves forward under the carriage's own weight
around screw A.
(11) Lightly push the screw B end of the carriage guide frame once or twice and check that the
carriage guide frame moves around screw A as shown by the arrows.
If it does not return to its original position, screw A is too tight. And if it moves on the screw A
end as well, screw A is too loose. Refasten the carriage guide frame lightly again and repeat the
procedure from C-1) Adjustment preparation .
(12) Lightly tighten screw B.
(13) Push the paper thickness lever to the right and move the carriage to position A. Then place the
gap gauge at position B.
(14) Repeat steps 2) through 13) twice.
(15) Tighten screws A and B alternately for final tightening.
Do not use your hand to move the carriage. It may cause the carriage guide frame to shift.
To move the carriage, use the carriage belt instead.
On the platen, there is an elevated step and paper guide. If the gap gauge is placed on either
part, an accurate measurement will not be obtained.
d) Adjustment check
After completing the adjustment, execute print test operation and check the image.
Figure 3-11 Head Gap Adjustment (2)
Chapter 3: Maintenance & Service
3-13