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#1
Old 08-19-2010, 01:09 PM
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My HP Printer Thinks it Has a Paper Jam

But it doesn't. There is no paper stuck in there.

Still, the screen keeps flashing "paper jam", and I can't get it to print. I've tried turning it off, I've tried pressing cancel, but it's stuck in "jam mode".

Any thoughts on how I can fix this? It's a HP Officejet J6840 Printer.
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#2
Old 08-19-2010, 01:27 PM
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Check the paper path for a scrap of paper stuck in a sensor.
#3
Old 08-19-2010, 01:33 PM
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You know this is what we all thought of. The action starts at about 1:10 of the video.

Office Space Printer
#4
Old 08-19-2010, 01:36 PM
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Quote:
Originally Posted by John Mace View Post
But it doesn't. There is no paper stuck in there.

Still, the screen keeps flashing "paper jam", and I can't get it to print. I've tried turning it off, I've tried pressing cancel, but it's stuck in "jam mode".

Any thoughts on how I can fix this? It's a HP Officejet J6840 Printer.
Mine does this all the time and I always have to restart my computer (assuming your computer is connected to the printer).
#5
Old 08-19-2010, 01:37 PM
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I'm seeing any images for the printer you mentioned, but if it's the type of printer where you load the tray with paper at the bottom and it comes out the top then there's probably an access panel on the back. Remove the panel and make sure there isn't a piece of paper jammed in it.
#6
Old 08-19-2010, 02:07 PM
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Quote:
Originally Posted by DooWahDiddy View Post
Quote:
Originally Posted by John Mace View Post
But it doesn't. There is no paper stuck in there.

Still, the screen keeps flashing "paper jam", and I can't get it to print. I've tried turning it off, I've tried pressing cancel, but it's stuck in "jam mode".

Any thoughts on how I can fix this? It's a HP Officejet J6840 Printer.
Mine does this all the time and I always have to restart my computer (assuming your computer is connected to the printer).
Well, I just did restart my computer for another reason before I read this, so let's see if it worked... Nope!

Quote:
Originally Posted by Joey P
I'm seeing any images for the printer you mentioned, but if it's the type of printer where you load the tray with paper at the bottom and it comes out the top then there's probably an access panel on the back. Remove the panel and make sure there isn't a piece of paper jammed in it.
Yes, it has one. I did take it off, and inspected it. No paper.
#7
Old 08-19-2010, 03:05 PM
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There's probably a tiny speck of paper in there somewhere - just enough to confuse an optical sensor.

If you have "canned air" dusting spray, take off all trays and access panels and blast away at the insides of the printer from every opening. Let it sit for a few minutes - chances are good that some of the liquid spray got inside and it simply needs to evaporate. Then, cross you fingers and hope the printer works. If not, you may be dealing with a failed sensor, at which point, it may be quicker and cheaper to get a new printer. "Home-grade" printers just aren't very durable any more.
#8
Old 08-19-2010, 03:07 PM
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Quote:
Originally Posted by gotpasswords View Post
There's probably a tiny speck of paper in there somewhere - just enough to confuse an optical sensor.

If you have "canned air" dusting spray, take off all trays and access panels and blast away at the insides of the printer from every opening. Let it sit for a few minutes - chances are good that some of the liquid spray got inside and it simply needs to evaporate. Then, cross you fingers and hope the printer works. If not, you may be dealing with a failed sensor, at which point, it may be quicker and cheaper to get a new printer. "Home-grade" printers just aren't very durable any more.
Yeah, that's what I was thinking of trying next. I can't imagine it would be worth it to pay someone to fix the damn thing. Thanks.
#9
Old 08-19-2010, 03:44 PM
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PC Load Letter?

http://en.wikipedia.org/wiki/PC_LOAD_LETTER
#10
Old 08-19-2010, 03:45 PM
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Have you tried smacking it?
#11
Old 08-19-2010, 03:48 PM
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Quote:
Originally Posted by Caffeine.addict View Post
Have you tried smacking it?
#12
Old 08-19-2010, 05:29 PM
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Quote:
Originally Posted by John Mace View Post
Quote:
Originally Posted by gotpasswords View Post
There's probably a tiny speck of paper in there somewhere - just enough to confuse an optical sensor.
Yeah, that's what I was thinking of trying next. I can't imagine it would be worth it to pay someone to fix the damn thing. Thanks.
That's what I said 18 minutes after you posted.

Just have a good blow into anything you find along the sides of the paper path.

Last edited by qpw3141; 08-19-2010 at 05:30 PM. Reason: More relevant embedded quote.
#13
Old 08-19-2010, 05:38 PM
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Quote:
Originally Posted by qpw3141 View Post
Quote:
Originally Posted by John Mace View Post

Yeah, that's what I was thinking of trying next. I can't imagine it would be worth it to pay someone to fix the damn thing. Thanks.
That's what I said 18 minutes after you posted.
I was talking about going to the hardware store to buy some "canned air".

Quote:
Just have a good blow into anything you find along the sides of the paper path.
Thanks. I didn't mention it, but that is one of the things I already did before posting the OP. I don't think that is as good as using the "canned air", though, which is why I'm planning to run over to the hardware store in a few minutes.
#14
Old 08-19-2010, 05:40 PM
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Quote:
Originally Posted by John Mace View Post
Quote:
Originally Posted by qpw3141 View Post

That's what I said 18 minutes after you posted.
I was talking about going to the hardware store to buy some "canned air".

Quote:
Just have a good blow into anything you find along the sides of the paper path.
Thanks. I didn't mention it, but that is one of the things I already did before posting the OP. I don't think that is as good as using the "canned air", though, which is why I'm planning to run over to the hardware store in a few minutes.
There are all sorts of ways of 'having a good blow'.

Good luck.
#15
Old 08-19-2010, 07:17 PM
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OK, so I opened a can of whoop-ass on the innards, and it still thinks there is a paper jam.

So, let me reword the OP: Is there a way to override this error message? I keep thinking that if I can just feed some paper through the damn thing, it'll clear up whatever sensor malfunction is going on.
#16
Old 08-19-2010, 09:29 PM
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Open and close all the "doors" and make sure that they are closed. My HP 3300 is kind of fussy that way.
#17
Old 08-20-2010, 01:08 AM
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Quote:
Originally Posted by John Mace View Post
OK, so I opened a can of whoop-ass on the innards, and it still thinks there is a paper jam.

So, let me reword the OP: Is there a way to override this error message? I keep thinking that if I can just feed some paper through the damn thing, it'll clear up whatever sensor malfunction is going on.
Can you do an offline printer test?
#18
Old 08-20-2010, 01:30 AM
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There are 2 types of paper sensors, one is a spring loaded micro switch and the other is an optical sensor. You can have a piece of paper jamming the micro switch or dirt on an optical sensor. You need to look at the path the paper takes and look for the switches.
#19
Old 08-20-2010, 05:46 AM
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I used to work for HP fixing Officejet printers. Granted, it was years ago, but HP isn't known for radical design changes year to year so their printers are still pretty much the same as when I worked there. I couldn't find a model "J6840" on the HP website, but I did find "J6480". Here is the doc on how to clear a paperjam. It also has directions on cleaning the paper pick rollers and the duplexer (if you have one). The document for out of paper message might be helpful, and here's how to do a partial reset. Did you also check where the cartridge carriage assembly parks? If there's paper under there it can cause a paperjam message too.

Quote:
Originally Posted by John Mace View Post
So, let me reword the OP: Is there a way to override this error message? I keep thinking that if I can just feed some paper through the damn thing, it'll clear up whatever sensor malfunction is going on.
The partial reset might clear the message, but if it's a malfunctioning or stuck sensor, forcing paper to go through it won't fix it. All it'll do is piss off your printer, then you have a rogue printer on your hands. Not pretty.
#20
Old 08-20-2010, 05:48 AM
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My Dell has been doing that too. Of course, Dell sucks.
#21
Old 08-20-2010, 06:41 AM
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My HP printer does that a lot too, and I know for certain there's no paper in there. Realigning the ink cartridges seems to help. It's an all-in-one scanner, printer and copier with the paper fed from the same place the copies come out; I think perhaps the cartridge or something gets dislodged by so much being done in such a small space, and the printer interprets that as a paper jam.
#22
Old 08-20-2010, 07:29 AM
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That happened to my wife's office printer once. After trying every trick we knew we eventually "solved" the problem by buying a new printer. Wish I had a better answer for you.
#23
Old 08-20-2010, 08:38 AM
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Quote:
Originally Posted by EvilTOJ View Post
I used to work for HP fixing Officejet printers. Granted, it was years ago, but HP isn't known for radical design changes year to year so their printers are still pretty much the same as when I worked there. I couldn't find a model "J6840" on the HP website, but I did find "J6480". Here is the doc on how to clear a paperjam. It also has directions on cleaning the paper pick rollers and the duplexer (if you have one). The document for out of paper message might be helpful, and here's how to do a partial reset. Did you also check where the cartridge carriage assembly parks? If there's paper under there it can cause a paperjam message too.
Yes, that's the model. Bad typing on my part.

I'll try the partial reset. I've already accessed the info on clearing a "real" paper jam and how to clean the rollers, etc.
#24
Old 08-20-2010, 04:01 PM
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"Partial Reset" doesn't work. Interestingly, I had already tried something similar, based on a web site I visited, only that site said to press 6 and # simultaneously (which was wrong).
#25
Old 08-20-2010, 04:21 PM
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I have a HP LaserJet P2015 that did that a while back. If I rebooted it I might get no warning light (in which case I could actually print a page or two), a different warning light, or the paper jam light. Our IT guy tried the reset routine for HPs, which made it go away for an hour or so. We finally called in the heavy guns (printer repair - this is my office printer, so I didn't have to pay for it), and come to find out the brains of the thing was toast. They had to replace a board or chip or something at the tune of a couple hundred bucks.
#26
Old 08-20-2010, 05:47 PM
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I have the same model and was ready to take a sledge hammer to it for the same reason. It stopped when I took the piece off the back that has to do with the double sided printing. There was a whole sheet in there. It wasn't wrinkled or wadded and I didn't see it when looking in near the front tray or lifting the top. I hope this helps.
#27
Old 08-20-2010, 05:54 PM
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Quote:
Originally Posted by gwendee View Post
I have the same model and was ready to take a sledge hammer to it for the same reason. It stopped when I took the piece off the back that has to do with the double sided printing. There was a whole sheet in there. It wasn't wrinkled or wadded and I didn't see it when looking in near the front tray or lifting the top. I hope this helps.
Thanks, but I've taken that piece off several times, and even cleaned it with distilled water like the directions say.

I'm going to fool around with it a little this weekend, and if I can't fix it, so be it.
#28
Old 08-20-2010, 06:26 PM
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Sorry. I know it's frustrating.
#29
Old 08-20-2010, 06:30 PM
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Originally Posted by gwendee View Post
Sorry. I know it's frustrating.
The ironic part is that I'll probably end up buying another of the exact same model (assuming it's still available). It was such a royal pain in the ass to set that bugger up, that I don't want to have go through that again with a different model. Loading those printer drivers is just painfully slow. Maybe they make it that way on purpose.
#30
Old 08-20-2010, 07:46 PM
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It might be worth calling them, if it's under warranty. They might think of something else or know of a hidden sensor somewhere. When you turn it on do the printer cartridges make a slamming noise they didn't used to?
#31
Old 08-21-2010, 11:48 AM
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Quote:
Originally Posted by EvilTOJ View Post
It might be worth calling them, if it's under warranty. They might think of something else or know of a hidden sensor somewhere. When you turn it on do the printer cartridges make a slamming noise they didn't used to?
It's not under warranty anymore. I bout it less than 2 years ago, but more than 1 year.

Good point about the printer cartridges, though, because that is one of the symptoms I didn't mention. The printer cartridges seem "stuck" over to the left, and when I hit the "cancel" button, they make a funny, soft, grinding noise before I get the error message again. I put stuck in quotes, because they're not really stuck-- I can move them pretty easily manually.
#32
Old 08-21-2010, 12:16 PM
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Another thought. The next time you throw your hands up in the air and walk away, unplug it. It can't hurt, but it might help to just leave it unplugged for a few hours.
#33
Old 08-21-2010, 12:29 PM
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Originally Posted by Joey P View Post
Another thought. The next time you throw your hands up in the air and walk away, unplug it. It can't hurt, but it might help to just leave it unplugged for a few hours.
Yeah, good idea, and something I've done several times.
#34
Old 10-08-2013, 03:25 PM
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HP Paper Jam Light Sensor

If your resume light is flashing on your HP 6940 and you can't get it to stop, and/or blank paper keeps being run through, what I did to FIX THIS (after many, many hours of trying everything), I sprayed COMPUTER AIR through the back of the printer, making sure to let it dry first (before putting the back panel back on). THAT SOLVED the problem. Yes, your printer thinks it's jammed, but it's really a sensor problem. Now mind you, I was still able to print a test page and all of that...so if you can't print a test page, then it may be something else. To print a test page on the HP 6940, hit POWER and the RED X button.
#35
Old 10-08-2013, 03:30 PM
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If that doesn't work, wait three years and try something else.
#36
Old 10-08-2013, 03:46 PM
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Hey John, did you ever get that printer working?
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