2900 is a support code documented for Canon PIXMA TR4720, Canon PIXMA TR4722. The automatic alignment sheet could not be scanned correctly.
What this support code means
The automatic alignment sheet could not be scanned correctly.
Applies to: Canon PIXMA TR4720, Canon PIXMA TR4722. Do not reuse the same code on an unrelated model.
What to try, in order
- Check the sheet orientation and alignment mark on the platen, and clean the glass if needed.
- Use the prescribed Letter/A4 sheet, check nozzle quality, and retry alignment.
- Use the manual alignment alternative in Canon instructions if needed.
After each step, repeat the action that produced the message. If it clears, you can stop.
When to stop
Stop if the instructed check does not apply, access requires disassembly, or the error persists after the documented steps.
Do not buy a part from the code alone. Check the exact model and manufacturer's part list if a replacement is actually required.
Models covered by this source
Official sources
These links identify the source and its scope. Check the manufacturer page again before changing a printer setting or buying a part.
- Canon — TR4700 series support code 2900 Checked 2026-11-01; official full page
Useful next steps
Found a mismatch? Request a correction with the public source URL and exact model, without passwords or full serial numbers.