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Re: paper jam laserjet 4
The rollers and guide on the back need to be cleaned and lubed. On the rubber rollers use a mild cleaning solution, on the bearings use a light oil and on the black plastic rollers you will see post that sticks out from the center of the roller here you will want to use a light grease (lithium).
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look on the back to see if there is a removable plate that will expose the rollers. On my HPs I have to clear a paper jam when ever the paper in the tray absorbs too much moisture. A sheet gets crumpled in the rollers where you cannot see it and the back plate allows me to pull the crumpled sheet clear. That is also where the paper sensor is located.
I have found that with laser printers that have an occasional "crinkle" problem that "fanning" the paper does alleviate the problem ... but it will not if there is an actual feed/hardware problem with the rollers
There is a long set of sensor flags on the bottom of the paper input unit that can get stuck and not move freely. This will cause jams from both trays. Try unplugging the printer, removing the toner cartridges and tray 2. Turn the printer on its back or side. You will see a long, black plastic bar with flags on it that runs the length of the paper input unit. make sure it moves freely.
I suggest you get a sheet of Card Stock (Heavy
paper) and place it in the feed way. Then press the print
button applying a slight amount of pressure on the Card Stock so it
will feed through the printer. The reason for this is in some cases I
have been able to clear the paper track of debris that was deposited there
Worth a try, as I have fixed a number of printers this
way, saving costly repairs.
Hope this helps.Bud
This could be a mis-match of paper sizes. Example, computer could be sending an A4 page to the printer. The paper size in the could be set to Letter. Ensure the 4 paper sizes match, in the computer - the document and printer driver; in the printer (change in control panel) and paper tray (adjust the physical side and length).
With printer unplugged, open lid and pull paper out by hand. Depending on where paper is jammed, you may have to lift out toner cartridge first. Be careful when pulling out paper, especially if paper is crumpled up. Sometimes it is easier to pull paper from back of printer as if it were continuing to print, and others it is easier to pull reverse from the front.
HP LaserJet 4, 4m, 4 Plus and 4m Plus Series Printers - False Error Message 13 PAPER JAM
After clearing all jammed paper from the HP LaserJet 4, 4m, 4 Plus, or 4m Plus series printer, the display still reads 13 Paper Jam . Even after cycling the power off and then back on, the error remains.
Open the rear door of the printer. There is a paper sensor near the upper right hand corner of the fusing assembly (just below the right edge of the long yellow warning sticker on the fuser) that can cause paper jam error messages even when there is no jammed paper in the printer. Toggle the thin black plastic lever up and down to make sure it is not stuck or sticky. The lever should be in the down position before closing the back of the printer. If the lever is stuck or missing, the printer will generate a false paper jam message.
Hope it will help you !