Diagnostics laser printer
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The diagnostics table below is generally true to most models of Canon printers.
Further advanced level diagnostic may be required to confirm the real trouble.

Symptom Cause Notes
Can not power up No power, bad switch  Check ac outlet, cord, switch
Error on start up Diagnostic failed Refer to service manual for specific model.
Vertical black lines on print Scratched image drum Replace toner cartridge
Black smudge Leaking toner Replace toner cartridge
Paper jam very often Paper channel blockage Replace obstacle
Paper feed error Too much paper on cassette Remove some paper
Paper can not feed properly Paper feed rollers worn out  
Paper delivery jam and crumble Delivery rollers worn out Replace rollers
Feed multiple sheets Sheet separator worn out Replace separator
Print out can be rubbed out Bad fix unit Overhaul fix unit
 

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