SOURCE: cannon pixma mp145 printer error code e7 & e2
E2: Reload the paper correctly and press [Black] or [Color].
E7: The cartridges are not installed in place.
These are from the manual.
SOURCE: Canon LBP-5000 Printer and Calibration
I solved this problem.
You need to bring your printer to some service, and perform cleanig of the printer's optic instruments, which are most probably coverd with dirt, and printer just can't recognize catridges, and can't give you the best print quality.
Just take it to the people who refill toners, or to some official service, they'll know what to do. I had the same problem as you, and today I can't recognize how better print quality is, and more importan, printer is not asking calibration any more.
SOURCE: cannon laser shot printer lbp
1.http://files.canon-europe.com/files/soft38030/software/LBP2900_R113_V310_Win_x64_EN_7.exe
2.http://www.microsoft.com/windows/compatibility/windows-7/en-us/Details.aspx?type=Hardware&p=Canon%20Laser%20Shot%20LBP2900%20Laser%20Printer&v=Canon&uid=0017B009&pf=0%26%23960%3B=0&s=lbp2900&os=64-bit
This is your download link for win-7 64/32 bit.
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