13.20 error after maintenance kit installed

[LCBirt]

I thought I was doing a good job of installing all the parts with the maintenance kit (purchased here) but when I plugged the printer back in, I got an error to check the rear door for a paper jam. There is no paper jam. Any thoughts on where to start?

Thanks. Love this site, BTW.

[raz]

what kind of printer is it?

[LCBirt]

Sorry, should have included this originally.
HP LaserJet 4050.

[raz]

actually ,i should have also asked if the 13.20 error comes up immediately after power on and not after a print job is attempted.in your post it sounds like you are saying it comes up immediately after power on and does not clear.

in this case , it would usually indicate that one of the sensor flags is stuck out of position.it may be the rear door area,but i have seen it where other flags are out and it just says rear door area.generally the rear door area would indicate the fuser output delivery sensor;it may be that one of them got knocked out during the install,there are usually two flags on the fuser,there are also others in around the pickup rollers ,but the main jam sensors would be just past the registration or in the fuser,so my guess would be the fuser flags.where they should move freely and fall all the way down into position so a piece of paper can push it up when it goes through.

[LCBirt]

I removed the fuser and installed it again, and it eliminated the 13.20 error. I didn't see anything obvious but did jiggle things around a bit and made sure everything clicked in place.

Now when trying to print, I get the error message to load the tray. Yes, it's loaded and the paper is below the little metal tabs on the side. I should say that the blue piece at the back of the tray is loose and sometimes I have to put that back in place, but it's been working fine.

When using the single sheet feeder, the page prints, but then gets stuck so that if I pull out the toner, the sheet it laying there and only about a quarter inch starts to come out the back.

Sorry, wish I knew all the proper words for parts, but I'm just feeling my way through. Any help is appreciated.

Thanks,
L

[raz]

there is a paper stack sensor that senses the loaded paper.this should be right around the tray 2 pickup roller ,just above tray 2.it may be stuck.if the paper is now jamming around, or under the cartridge,it could be the transfer roller not fully seated.this is usually changed with a maintenance kit.double check the cartridge seating and transfer roller;this is not far past the top of page sensor,which is just past the registration.if something were slipping in the registration,it can cause this,though if the paper leading edge is making it all the way to up under the cartridge;i would think it could be in that area.the top of page sensor will detect the leading edge of the paper after it pauses at the registration to line up the paper with the print on the drum.if the paper is out of alignment with it's timing reaching this area,it may be showing a jam error.you could double check the registration or clean it's rollers.or double check that sensor there.

[LCBirt]

As I said, I'm not all that familiar with proper names. Where would I find the registration? I'll check all those things you mentioned.

Thanks,
L.

[raz]

if you open the top and take out the cartridge;you should be able to look straight down in thereand the registration is just in front of the transfer roller.there should be like a metal guide bar going accross,then some plastic rollers going accross with a metal bar on the front side of the rollers.you can pull that metal bar back and if you look down the front of the plastic rollers (under them),there are some rubber rollers.those can be cleaned.also,just in front of the plastic rollers,there is a bigger flap that covers over the registration,it should have a small green handle on the right side.this flap can be lifted all the way up to expose more of the under part of the registration.so you can lift the registration flap(shutter),and hold it back and then lift the metal bar on the front of the plastic black rollers to be able to see down in there.it is a bit crammed down in there and not to easy to get at but it can be done.it is more of a job to get the whole registration out.you can turn the rubber rollers by hand ,a little at a time to be able to clean all the way around them.also when these two flaps are pulled back and you are looking at the rollers;right in the center down in there,there is a small plastic piece(like a thin black plastic bar up against the roller shaft);this is the sensor flag,and can be moved away from the rollers and should snap back.

[LCBirt]

Raz, thanks for the great description. I have checked all the rollers you described and the small black flag, checked the seating of the transfer roller, and still have the same problem. Do you have any other suggestions?

The paper seems to go through normally, no unusual sounds or vibrations, until the bottom of the page is just barely under the black flap (the one that opens with the green lever on the right). There is probably about 1/8 of an inch under that flap.

If I can get this part solved, I'll move on to the "load paper tray" issue.

L.

[raz]

are you saying that the leading edge of the paper is 1/8 inch under it or the trailing edge?i guess the question could be;where is the leading edge ending up?

[LCBirt]

It would be the trailing edge. The leading edge is just barely coming out the back of the printer, just starting to go around the rollers.

[raz]

if this is the case,then it looks like it is pretty much past the registration and i would look to the fuser and it's associated output delivery sensor.make sure the feed belt before the fuser is all the way on and working properly and the transfer roller is snapped in all the way also.it could possibly be a cartridge causing an issue also.

[redcow]

Take the fuser that you pulled out of the printer and put it back in.
If the problem went away, you probably put in a defective fuser.
If the problem is still there, you just eliminated one puzzle piece.

[LCBirt]

One more thing eliminated. I put in the old fuser and get the same problem. I'm afraid I'm ready to throw in the towel and take it to the repair shop.
I'll do a little more checking and rechecking tonight, though, just to make sure I didn't miss anything.

Thanks to both of you for your help.

L.

p.s. - just wondering, is it usual to have a private message here from a company offering a manual for sale?

[raz]

i don't know;so far i have not recieved any messages.offhand,it sounds like a spam.i have not posted any links to free service manuals on here,because i am not sure if that is ok to do here.if any moderators know,let me know.

i would think the issue would be around that area somewhere,although,if it is a multi page document,then subsequent pages could be slipping or sticking or something.where the first page makes it through and the second or third page could be slipping at the registration or out of the pickup assembly causing a timing error.

[LCBirt]

Well, I had to bite the bullet and take it in to a repair shop - have to get back to work, ya know. I guess I missed a flag in the fuser area that was stuck. As I was putting it in my car, I dropped the tray so the part that had been loose, came off completely. Luckily, I had ordered a new part but just hadn't replaced it yet. So I took it all to the repair guys and they fixed it within four hours.
So I'm happily back in business again.

Thanks for all the help.

L.