Canon multipass c3000 Service Manual (en)

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Print Shift Correction
Print gaps can occur when doing bidirectional printing, due to changes in the
weight of the BJ cartridge and mechanical errors.  This gap is corrected by
adjusting the carriage drive motor load and the carriage position, which is
determined logically from the number of stepping pulses.  Gap detection is
performed before the start of printing, during the home position detection
operation.
Chapter 2: Technical Reference
2-17
NOTE