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You can pull out each cartridge and shake it gently
to redistribute the toner. Try a half page test to eliminate the
various stages of the image formation. The timing on this is not easy
but through trial and error it can be helpful.
Your problem is not isolated; I read of two others on this site in mid-August 2008 and added my own post.
I contacted Canon Support and tried their solution (which you've already tried); it did not work. Given the choice of repairing a printer that I've had (and babied) for less than 2 years or buying a new Canon at a discount under their Loyalty Program, I chose to take my MP530 to a Canon Authorized Repair Facility.
According to the repair tech, there is a problem with the waste ink tank and ink absorber pads. The repair facility ordered and installed a rebuild kit; it took about 2 weeks. The printer now works beautifully again.
If your printer is still under warranty, you're in luck. If not, ask that it be handled as a warranty repair. In my opinion, Canon should recalling and offering to fix this problem free of charge.
Same problem appeared with mine, but one month out of warranty. Black
streak of varying intensity up to 6mmm wide on reverse of sheet being
printed. Repeated reuse of the "Bottom Plate Cleaning" utility (60 to
70 times) did not solve the problem. Seems the problem lies with the
pipe that carries waste ink from the purging dock to the middle of the
machine where there is a large ink absorbent sponge. This pipe (or tube) blocks up and excess ink then builds up, eventually ending up on the back of the paper being printed. Canon support
refuses to accept that this is a design fault, and claims that it is a
"mechanical fault" , not their fault as the warranty has run out. There
may be an 18-month warranty in parts of the US, but for the rest of us
it is 12 months. Took the machine to the local Canon-authorised repair
shop who charged EUR80 to unblock the pipe. There was no breakage or
other mechanical fault. It will block up again, and there is nothing
you can do about it - just grin and pay the repairman. It is amazing
that a defective design such as this is allowed to be offered in the