Question about Canon PC-795 Copier

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PC-795 Shuts Off Mid Copy

My Canon PC-795 shuts off mid copy everytime. The page is in the middle of theclamshell section with half a copy on it. I press the power button it powers up with a paper jam error. I remove the paper restart and try a test copy and it does the same thing. If I power it on and leave it, it stays on no problem but as soon as I make a copy same problem happens.
What could this be? Also when I got this copier there was a large black screw, the screw looks plastic, rattling around inside. I did not power it on or use it with the screw in there and it may not even be from this unit but I figured id mention it.

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Re: PC-795 Shuts Off Mid Copy

Clean big rubber paper feed roller above paper tray with a microfibercloth moistened with rubbing alcohol.

open copier look in lower section under the toner cartridge you will see a black foam roller wipe it off also and then try to use.

Posted on Jan 17, 2008

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Sounds like your drum cartridge might be bad.
Something you can try that might narrow down the problem is to make a copy of something and shut the copier OFF in mid copy.
(Basically, when the light is about 1/2 way finished scanning.)
Then, open the machine up and removed the jammed paper which should be 1/2 way through your machine and hopefully about 1/2 way under the drum/toner cartridge unit.

See how the copy looks at that point. **** FYI **** The toner on the paper is NOT FUSED so it will RUB OFF. Keep the paper away from your clothes and toss it.
IF your copy has smudges on it, then there is a real good chance that your drum unit is bad and needs to replaced.

If the copy looks good, then there is a possibility that the fuser unit is bad and needs to be repaired.

I would say that your drum unit is bad with my experience with Canon Copier.

If you still have more questions, feel free to ask.
Have a good day.
Good luck.

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Either the Fuser/Heating unit is bad, or the optics are dirty.
What you can try to do to narrow it down, is to make a copy but.. STOP the machine in mid process by turning the power off. This will create a paper jam in the machine. If timed properly, your copy should be 1/2 way through the machine with some image on it. (Make sure that you are trying to copy something on the glass). The copy is not FUSED, so the toner will wipe off so be careful not to rub the page against your clothes/sleeve. IF the black line is on the page at this point, the problem is not in the fuser but probably in the fiber optics. If the problem is in the optics and will need to be cleaned. If the black line is NOT on the page at this point, then the fuser unit is bad and needs to be replaced.
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The blinking light with the squiggle symbol is the display for a paper jam. Not sure a service manual will help in this situation other than to be a guide as to where the paper sensors are located. There are usually 3 or 4 paper sensors located in Canon PC copiers. The first sensor will be located between the paper pick up assy and the vertical rollers*(*which are located behind the door on the right hand side used for clearing jams). The second sensor is located under the toner cartridge just before the registration rollers. The third sensor (if present)is located at the entrance of the fuser assy (some models of Canon copiers have omitted this sensor)The last sensor is located at the exit of the fuser assy. I would suggest that you remove the cassette, verify that a piece of paper has not been partially fed or ripped in the pick up assy. With cassette out of machine, open right hand door & verify that there is no jam and check that the flag or arm of the sensor moves freely. Remove the cartridge from machine and again verify there is no jam and the registration sensor arm moves freely. If there is a sensor in front of the fuser assy, verify that it also moves freely. Finally, check for a jam and sensor movement at the exit/fuser. After checking all sensors, unplug the machine and plug back in. (Do this without the cassette & cartridge installed but with all the covers closed) This should give you an install cartridge & cassette message. Install cartridge first. This should give you the install cassette message. Install cassette. If you still get a jam signal when plugging the machine in without the cartridge or cassette, the most likely cause is a blown sensor.(rare, but I have seen it.)If this happens you would then need the service manual to disassemble & repair. I'll keep an eye out for your reply! Good Luck!!!

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