anonanonasked Nov 14, 2017 at 6:50pm
Grinding noise after cartridge replacement
I have a Hewlett Packard Laserjet 4L printer. Very reliable printer. This one was hardly used when I got it about 3 years ago. I worked on the solenoids, to repair a problem typical of printers this age, soon after I got it. Since then, no problems, until now.
Last week I replaced the toner cartridge with a remanufactured one. It didn't seem to fit well. Then the top door didn't close well (takes some fiddling to get the sensor to recognize that it's closed). And today it stopped printing. Instead, it makes a high frequency grinding/humming noise. It does not even attempt to draw any paper. It will make this noise even if the paper tray is empty. It sounds like a gear is slipping, maybe.
I have also tried the cartridge that was working before (and that printed 2000 pages with no problems); it produces the same grinding noise. So it's not the cartridge that's the problem.
Never heard a grinding gear noise from this model. I suspect it might be the laser motor bearing. You can open the laser unit and the motor/mirror assy. lifts off. Put a drop of synthetic lubricant on the shaft and put it back together. Be careful not to touch the mirrors with your bare fingers.