Faded black and white print out (Canon NP 6035/6028)
The motor gear wheel arrangement inside the toner box does not seem to roll and load in toner, hence the print out is fade.
How do I remove the toner box for sericing, what voltage do i expect at the motor terminal, Perhaps you can help with a service manual, I will ever be grateful.
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Re: Faded black and white print out (Canon NP 6035/6028)
Are you getting a E0020 code? If not there is nothing wrong with the hopper. Has the OPC unit been replaced recently? Also, have you looked at the developing unit? Dose the developer Mag. roller have a even coat or brush on it? If not have you cleaned the S-Blade or doctor blade? Also, have you cleaned the optics?
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Most often on the PC940 this means your toner cartridge is getting low on toner. To prove this is the cause, just remove the toner cartridge and while keeping it relatively level, shake it side to side a few times. This will re-distribute the remaining toner in the cartridge. Re-install and make a copy. The black streak/faded copy should be much better. If so then I would go ahead and get a new cartridge on the way.
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It is to hard to explain in typing so if you could call me in the morning say around 8am PST I will talk you through how to get the upper fixing assembly apart. If you need this tonight 6/13/10 go ahead and call me…. I am in San Diego. Thanks and I will do what I can to help you. Chris
Everyone will tell you that it's the Imaging Unit - happy to say that's not true. If it was the imaging unit the colors would not come out right either. I bet if you print a test page that all the colors come out fine across the page. It's only the black. Also - if you replace the black toner cartridge, or reinstall your printer and drivers like some people will tell you - still no results. The problem is in the black toner cartridge PATH inside the printer. Something has jammed it up a bit. Try taking out the black cartridge and blowing firmly into the small hole at the bottom of the spout that looks to have a sponge inside. Use a straw and make sure your air blown is dry. Then lightly tap the cartridge a few times. Then use the straw and once again blow very firmly inside the receiving path (inside the printer) for the spout on the cartridge. Make sure you are blowing into the spout path at the bottom - not the gear drive path in the middle - as that will not do any good. Replace the cartridge, warm up and print another black and white page. You should see that the faded out section is gone or diminished in size. If it is not gone, simply repeat the above steps until it is gone. You will see that the faded out strip gets smaller and smaller each time until it's gone. I had to repeat five times, but eventually got it corrected. Now prints like brand new so don't get discouraged. Loki
Sounds as if it is low on toner.When they run low, the motor will continue to run trying to add more toner.The toner add system is a glorified flour sifter.Eventually it will set the add toner on.Good Luck
With toner being dropped I would take a close look at the cleaning unit next to the drum. Sometimes they become clogged or wear out. Inside the machine, can you see toner that has spilled or piled up? If so that is an indication of a faulty cleaning unit.