Carriage Unit Removal - Canon PIXMA MX870 Service Manual

(7) Carriage unit removal

1) On the main chassis, mark the positions of the screws that fix the carriage rail to the main chassis (3 points for each
screw: the left, right, and center).
2) Remove the timing slit film. Be cautious to keep it free from any grease or damage.
3) Using a pair of pliers, etc., release the left end of the pulley holder spring, then remove the carriage belt. Be cautious
to keep it free from any grease.
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