I have a Canon D-340 printer. I removed the toner cartridge to replace it, and now I cannot reinsert either the old cartridge or the new one. I have tried repeatedly.
Make: CanonModel: D-340
Repeated insertions without success. It always used to be quite easy to insert a new cartridge.
When looking inside of the printer verify nothing has fallen into the track that may be obstructing its installation and follow these instructions
I work for a HP authorized repair center.
I thought I did reply to you. Anyway, your answer was not helpful. It merely repeated what is in the manual. I believe my printer is malfunctioning. Ordinarily when one inserts the toner cartridge, the printer sort of "swallows" it. Now it doesn't, but I can't see why not. It is not a defect in the new cartridge because printer will no longer accept the old cartridge. I imagine this must be a failure mode known to people familiar with Canon printers.
I must apologize. I called Canon support this morning and discovered that my problem was trying to insert the toner cartridge in the wrong opening. Somehow I got so fixated on the door that I had opened that I completely lost track of what I was doing. I have to say that I am embarrassed and apologize for my somewhat surly tone in earlier emails. I will approve your payment.