If your registration is off, it will effect the calibration printout alignment. And as with the Laser alignment.
Causing a auto cal failure.
Happens on many iRC's an Advanced Color models.
Also will happen if some settings in service mode are changed.
http://support-th.canon-asia.com/contents/TH/EN/8201859200.html
NOTE
If the <Correction failed.> message is displayed
- Did you load plain or recycled A4 or Letter size paper in the paper drawer ?
- Did you place the adjustment image with the print side face down, with the black stripe toward the back side of the machine ?
- Has a paper jam occurred ?
- Is the amount of toner required for correction sufficient ?
- Is the transfer belt inside the machine dirty ?
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