Does this occur when copying, printing, or both?
Do you see the black lines on scanned pages?
Pete did not continue with you, so I'd like to help if I can - my name is*****
When did you last change the toner cartridge for the black color?
When you last put a black toner in the machine, was it a new Canon OEM-original toner cartridge, or was it a refill, remanufactured, or 'Canon compatible' cartridge?
Do you print from a computer to the machine, or only do scanning and photocopying?
(And of course, a remark: if you are doing scanning, there *is* no 'other side' or 'reverse side' - unless you are scanning double-sided? which is pretty fancy, and rather rare.)
If you will check your email account more carefully, you will find that I already responded about 2 1/3 days ago, with a query for more details. I received no response so I could not work further on the case. It's just how this site works: instant answers are not always possible, without a query for further information.
Thank you for bringing your question to us here at JustAnswer.com.
(As for your request for a refund, I have no power (as a JustAnswer Expert) over refunds, charges, etc. I must refer your request to Customer Service at JustAnswer.com, which may be contacted through:
They will no doubt address your request or inquiry with reasonable promptness, considering that in the United States it is Sunday evening.)