Question about HP LaserJet 4L Printer

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Hp laserjet 4L

Paper only travels about halfway through it's cycle and drive motor shuts down. No jam, it just times out.

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Had a similar issue with an hp laserjet 1020. The feed was stopping halfway through, same spot every time....
Turned out to be the paper pickup solenoid. The solenoid was stuck to energized and kept feeding sheets, one right after the other.... as a result, the end of page sensor was not detecting the end of the page - there was no gap between the pages - and was calling a paper jam.
The solenoid is located at the rear bottom right of the printer, when facing the front... You have to remove the right plastic cover...
Check that after the solenoid is energized and the page is fed, the solenoid lever returns to the open position, i.e. not stuck on the electromagnet... If it remains stuck on the electromagnet, the sheets keep feeding back to back and paper jam...
You can try pushing it open manually with a long screw driver after the page is fed, to see it this will solve your problem...
If indeed you have a jamming solenoid, you can try the following fix...the problem seems to be that overtime the solenoid core and/or lever become magnetized and the force of the return spring is not enough to pull the lever back to the open position.... an adjustment needs to be made to the spring so that fewer coils are used and the spring becomes stiffer, and hence able to pull back the lever... the solenoid has to be removed.... at the bottom you can see the return spring... pull the little mounting ring at the end of the spring off of the mounting pin at the bottom of the lever...and then use one of the spring's coils at 2/3 to 3/4 of the length (don't make it too stiff!) to hook it again on the pin... effectively reducing the spring's length ....
This worked for me! Printer is working fine now!
Please unplug the device and remove residual current before attempting repairs. If you are unsure about what you are about to do, get expert advice...Dangerous voltages and/or other hazards are present inside electromechanical devices. Use the above guide at own risk!
There is a service manual here:

Posted on May 02, 2017

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If you have cleaned the paper feed rollers, and your sure the fuser is turning and your cartridge is ok then, the drive motor on these have a white plastic gear that cracks and allows it to slip on the shaft of the motor. I might still have some of the gears here. I fixed some by apoxying the gear on the shaft and some by flipping the gear on the shaft. Wouldnt spend a lot of time with it. a new laser 4 times as fast is advertised here regularly for less than $80.00

Posted on Aug 30, 2007


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Posted on Jan 02, 2017

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I have had a similar problem. The 4L has an inherent fault in the motor drive gear. It is made of nylon and has probably developed a hair line crack. As a result the gear slips when the printer starts up and tries to feed paper. I have replaced this part some years ago by replacing the whole motor and gear. I did find the replacement parts on eBay today. Here's the url:

The manual is also on line at another place. But when you order the parts you get a manual on CD. I am not the guy selling the parts but need them too that's how I found them.

Good luck.

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