asked Jul 26, 2016 at 12:55pm
Hp HP LaserJet 4

Paper Jam

A few years back I ordered The HP Laserjet 4 Fuser Jam Repair Kit, and the Fuser Gear. I replaced the large gear at the end of the fuser, and I replace the end gear inside the gear box.

Everything seemed to go together fine, but when I print, the printer stops feeding and gives me an error 12 paper jam. If I turn the printer off and print again, the paper will at times feed through. I have tried both the bottom and manual paper trays with the same effect.


I should also add that even though the replacement parts were added sometime back, the project was benched, and I just replaced the parts yesterday.

by DumpsterDiva on Jul 26, 2016 at 1:32pm Add comment

Where exactly is the leading edge of the paper when it jams?

by moe on Jul 26, 2016 at 2:56pm Add comment

About and inch a half of the paper is sticking out of the back of the fuser. That is where it jams. If I turn the printer off, turn it back on, and print again the paper will feed through.

by DumpsterDiva on Jul 26, 2016 at 9:30pm Add comment

There is a black plastic flag arm on the right side of the fuser. It is L shaped. Part of it is between the heat roller and pressure roller. The paper pushes on it when it exits. The other part sticks up on top and goes in and out of the sensor. What happens is if you remove the fuser and you aren't careful, the arm breaks on the bottom where it pivots. You can wiggle the arm and tell if it is broken. It should just go back and forth and no wobble side to side. That is the only thing I can think of that would cause the jamming.

by moe on Jul 26, 2016 at 10:49pm Add comment

If I have the back of the fuser facing me, and I open the spring loaded door, inside about an inch and a half from the right, there is a black plastic piece that hangs straight down. I have not taken the fuser apart again, but from what I can see the top part appears to be cylindrical and wrapped around a bar. It does move back and forth and has a tiny amount of play from side to side, but it does not appear to stick up at the top, unless this can not be seen with the fuser assembled. Is this the flag you speak of?

by DumpsterDiva on Jul 27, 2016 at 1:23pm Add comment

That is the flag I described. To the left of the skinny piece hanging down, is a small peg that sits in a hole. If the part on top snags when you pull the fuser out, that peg and it doesn't activate the sensor most of the time. Try grabbing the piece between your thumb and index finger and lifting it slightly up and down. If the peg is broke, you'll be able to see and feel it moving.

by moe on Jul 27, 2016 at 4:43pm Add comment

The rear of the fuser is facing me, I have removed the block to the right, and I can see a hole where the flag pokes out. It is barely poking out of this hole, and what does come out is shiny and somewhat uneven, which makes me think the end that comes through the hole broke off. Do you possible have a picture of this piece so I can know for certain?

by DumpsterDiva on Jul 27, 2016 at 7:59pm Add comment

Don'the have a pic, but here is the part http://www2.printerworks.com/cgi-win/tpwall.exe/find?RB1-2273-000

by moe on Jul 28, 2016 at 9:30am Add comment

I replaced the part, which was broken. Was still getting a paper jam message, but there is not any paper in the printer. I tried turning off the printer, when I turned it back on, during warm up the printer started making a loud hammering noise. It sounds like a jack hammer thumper, and I could feel something thumping inside. I turned off the printer.

by DumpsterDiva on Aug 3, 2016 at 11:38pm Add comment

I just a toner cartridge online, and it seems to be the toner cartridge making the thumping noise.

by DumpsterDiva on Aug 4, 2016 at 12:04am Add comment

Moe, I replaced the black plastic flag arm, and that WAS the problem. I bought a bad toner cartridge that was causing the grinding noise. After I replaced this, the printer worked once again.

Thanks for all the the disk tutorials you provided a few years ago, and the parts and continued support. It was all valuable information that allowed me to get my printer up and running without taking it to the repair shop.

by DumpsterDiva on Aug 22, 2016 at 4:49pm Add comment