How to solve error 6A90 or "APP sensor error" on Canon printers


Error code 6A90 or "APP sensor error" occured during paper feeding or purging.


Solution 1:
  • check for foreign material or paper debris around the purge drive system unit;
    - remove foreign material.

Solution 2:
  • check for foreign material or paper debris around the ASF unit;
    - remove foreign material.
Solution 3:
  • If other solution fail, replace one off the following part
- Purge drive system unit
- Logic board

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