Faulty Printing - Canon BJC-820 Service Manual

Part 4: TROUBLESHOOTING

3. Faulty Printing:

Blank Lines
Appear
<Measure>
Cleaning operation
Print the nozzle check
pattern
Do print problems
appear?
Yes
Reinstall the BJ cartridge
Does problem still
occur?
Yes
To next
page
<Symptoms>
<Cause>
The BJ cartridge; BJ cartridge contacts; carriage
ribbon cable; purge unit; logic board or carriage board
is faulty.
Perform these steps up to 5 times.
See Part 3: 1.5.2 Nozzle check pattern printing (page 3-6)
No
END
No
END
4-16
Blurred prints; Blank lines; Specific dot missing
BJC-8200