Question about Printers & Copiers
We have a Canon Pc720 and it displays a paper jam, however there is no paper jam. I replaced the paper feed sensor for some reason and that didn\'t fix it. I was reading about a "paper path sensor". Can you tell me where it is located on the copier and where I can purcahse one please?
The problem with the paper jam (but not feeding) is that a small
piece of plastic that holds one end of a spring the causes the feed
gears to push against the powered gear on the back side of the toner
cartridge breaks off. So the unit does not feed (no pickup rollers
etc) and it thinks there is a paper jam (no moving paper). Orienting
the front as the side you work at, the back being the back, the
feed being the side the paper goes into and the output being the
side the finished copy comes out, open the unit. Looking into it
from the output side almost to the input on the bottom notice the
small hairlike things sticking up. Move to the left (back of the
machine) and see a few white gears all hooked into this gray metal
housing that moves up and down about 1/2 inch (It pivots). At the
top input side of this metal you will see a part of the metal that
stick up and has a small slot in it. the spring used to hook onto
this and the other end hooked to a small piece of plastic down and
more to the input side a bit, onto the upper input side of the white
plastic part that houses a shaft to a roller (fat little spring
about 1 inch long). the plastic part breaks off and you usually
can't see that a part was even there. The spring will still be in
the area. If you are handy, you can figure out how to fix it. I got
a longer spring (same strength) bent the metal toward the back 1/4"
and ran the new spring from there to a 1/16 hole I drilled in the
plastic side next to the circuit board (down low and back). I shaped
the end of the spring (where I drilled)to keep it more inside and
not hit anything. Works fine.
Posted on Mar 30, 2008
Thanks, Repairman 99. I had the same problem. Using your detailed instructions above, I located the spring, and the hook/slot on the gray metal piece which you described. But I couldn't find where the other end of the spring had been attached. Nevertheless, I used a piece of flexible wire to attach the bottom end of the spring to the black housing just below. Put the wire through the bottom end of the spring first, then fed the wire through the space in the black housing and twisted it tight. Then attached the top of the spring to the gray metal hook/slot, and closed. I'm back in business. And I hope that this method of reattaching the spring may be helpful to others.
Posted on Jul 26, 2010
I think you are looking at the wrong direction. If the paper jam occured just after you pressed the start button; and the paper did not leave the paper cassette then the paper sensors are working correctly. This is because the sensors are expecting to see the paper coming but did not therefore initiating the jam signal.
Check the paper feeding roller and the transport roller if they are worn out due to aging.
Posted on Feb 21, 2008
There is a black plastic piece that sits on top of the grey metal housing.If the spring is still present, you can unhook the plastic piece, slip one endof the spring over it, the other on the metal hook that holds down the gears andyou are done. No need to rehook the plastic (just leave it floating) everything fits. Works like a champ. I purchased this copier in 1998. Not bad for a 15 year old copier!
Posted on May 12, 2012
Repairman99 has the correct solution here as my Canon PC720 Copier went down yesterday afternoon and I had no idea where to turn too. After some searching I found the link here to Repairman99's solution and starting looking for my problem. First off early on I thought maybe it might of been the dust inside the unit so I brought up a portable air compressor and blew out all the dust. Didn't help but later on checking the unit inside as thorough as I could I found the sprong spring Repairman99 and others spoke about here but could not find exactly where the broken plastic piece was. Thought about drilling a hole to attach the spring as others mentioned but after thinking about it decided to use a Nylon Cable Tie instead as I have a few different size bags of them in my shop as they always come in handy and are strong. I thought why not and picked one of the skinnier longer ones about 7 inches to wrap around through one end of the spring to keep it snug with the other end attached to the gray metal piece as it was from the factory. Just tied the bottom of the spring snug and out of the way. My Canon PC720 works like brand new again thanks to Repairman99. Just to mention in my search on the net it looks like many have junked their PC720 Copiers for the exact same problem. I almost faced that situation and found that there was nothing out there for sale that compared to this machine as many were complaining about the newer models that they did not come even close to working like the PC720. Many on the net said the PC720 could not be repaired as there were no parts available. I have owned mine since buying it brand new in 1998. It has worked flawlessly for almost 12 years. Only bought one Toner Cartridge in 12 years. Have been filling my own 2 Cartridges with toner bought on the net with no problems in case other PC720 owners were thinking about it. Very easy to fill and works like a brand new cartridge.
Posted on Dec 01, 2011
That was EXACTLY the problem with a copier my grantmother has! I was able to find the spring and the plastic "hook" that broke off!
Used a small screw to reattach it and works again!!!
Thanks so much for your post!!!
Posted on Nov 13, 2008
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