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Quite often these sort of problems are caused by the paper feed roller(s) becoming too smooth to pick up the paper. Gain access to the roller and, using a very fine emery paper, about 600 grit and gently rub it all the way round and along to give it some grip. When I say "gently", I do mean gently.
This seems to be fault in the transport of the paper in the rollers. Since you had used an adhesive based envelope for printing, it is possible that some glue has got clogged into the rollers. If not there can be some jammed paper in the rollers or the mechanism. So start this work only if you are mechanically able with the right tools. Remove the covers to get access to the mechanism . Remove the motor drive assembly , the fitting of the motor to the mechanism. Once this is removed the rollers can be turned manually so that you will be able to feed a paper to see the progress of the movement while studying if there is any obstruction or damage to the paper. There is a in-detect sensor, usually an opto-coupler , make sure this is not clogged or dirty as this IR detection feeds the signal to the processor for starting the motor drive feed. Reassemble but make sure the rollers are aligned to be in equal gap to feed the paper without a side pull. Now you must print and see if the fault has changed. If not repeat the above workto confirm the area of obstruction
It's been my experience with these machines that envelopes are always fed through the manual feed tray.
The Tray 2 cassette's pick up assembly is different than the manual feed, it has 2 rollers that have a wide area they can pick up while the manual feed has just 1 single roller. If you remove the tray cassette and look under the printer you can see the two rollers, these would probably have a hard time picking up a standard size envelope. Also the tray would have to path the paper up and would have to bend it through the paper path which can cause problems with the flaps on the envelopes.
Best method is to use the manual feed tray and to also have the back cover open so that the envelopes path straight through the printer without being curled.
(I've seen these in a ton of places ranging from small business to banks and they always have the envelopes in the manual feed)
There are three areas for paper jam clearing. 1. Under the scanner cover 2. At the rear of the printer is a small door with rollers at the top. it comes away from the printer from the left. There are some small pins to hold it in on the right. Swing it out to remove the door. 3. The cassette tray. Remove the tray to expose jammed paper or envelopes.
Rubber rollers in the paper path probably have lost their grip; the surfaces become glazed and slip instead of transporting the sheet as they should.
Gaining access to the paper path varies in difficulty since many later units may be partly snapped together and use few screws for assembly.
If you decide to attempt this, use a hard cloth and naptha (lighter fluid) to scrub the rubber rollers; this should produce some black smears on the cloth if the rollers are glazed.
Don't use alcohol since this will dry them out further.
Naptha is safe for most plastics and aggressive enough to cut the glaze.
While you are inside, check to make sure there are no scraps of paper complicating things.
There are two sets of rollers inside the HPLJ4 series. One set is immediately above the document feeder tray. A second set is inside the rear cover. The problem you describe can often be fixed by cleaning the existing rollers. I would remove the toner cartridge from the front of the machine, then I would get a hose type vacuum cleaner and a small paint brush. I would clean the inside of the machine. I would open the back cover and visually inspect the rubber wheels (rollers) to make sure there were no flat spots on them. I would remove the paper tray and turn the machine over and visually inspect the bottom roller wheels to make sure there were no flat spots on them. I would get some cue tips and drugstore denatured alcohol and clean every roller I could find. This worked for me for more than five years after i first noticed the problem on a LJ4 that printed over 100 sheets a day for a small business.
it happens when the paper feed rubber rollers get extra smoothened.just ope up the printer and scratch the rollers a bit with wall scratch glass paper.
it will again grip the paper properly after that.its a common issue and gets solved easily.thanks.
1. Turn the printer off and open the access cover. 2. Look for any obstructions in the paper path and remove them if necessary. (It is possible to move the carrier assembly with the power off.) 3. Turn the printer on, load some paper, and press the Form Feed button. 4. Watch the paper as it feeds through and try to determine where the jam is occurring. 5. Check to see if all the rollers are turning.
If all the rollers are turning, there may be something in the feed path that you can't see. Go to step 6. If not, there is probably a feed motor or a gear problem and the printer may require service. 6. If the paper is jamming under the carrier assembly, you may be able to fix it using the manual feed slot. 7. Turn the printer off. 8. Take a #10 envelope and feed it through the left side of the manual feed slot until it comes right through the printer to the back of the exit rollers. 9. Move it up and down first, and then slowly move it over to the right side. If something is stuck under the black guide plate, this may work it loose.
I have an older, but similar, 5510 model with the same problem. A partial solution that works about 75% of the time is to tuck the envelope flap inside the envelope and give the end of the envelope that is to feed into the machine a slight curve by gentlly bending it on both sides. Then make sure there are only a few sheets of paper in the paper tray (less than 1/8" thick stack). Position the envelope so it is only about 1/2" from the end of the paper in the tray so the feed rollers have to transport it into the machine. I also have to set the margin for the return address in Word to be 1" from the edge of the paper so it prints in proper position, but this may be a problem with my Word 2000.