asked Jul 14, 2008 at 10:27pm
Hp HP Color LaserJet 2840

HP Color LJ 2840 - Printing all blank pages

Good evening/morning all. I recently bought a printer off craigslist that i knew needed a new carousel. This evening I have finally finished replacing the part.

Well - now, I cannot seem to get the printer to print anything. There are no error messages, and the printer seems to respond like normal. Just no printing. Text, pictures, config pages, engine test - nothing. I am wondering perhaps if 1) I forgot to hook something back up during the process, or 2) this printer has more problems with it.

Can anyone please give me a hand with this? I have the service manual, but it basically tells me I have a problem and to run an engine test.

Thanks in advance :-)
i had this problem as well. in my case the gears on the right hand side of the machine were misaligned.
by rukusbringer on Jul 31, 2008 at 10:45am Add comment
Been a while as this printer has the same engine as the 1500,2500.2550. I seem to recall there was a shutter on the laser/scanner. See if there is and if it is working right.
by dmzcompute on Jul 31, 2008 at 7:27pm Add comment
I just finished my first LJ 2840, and it had exactly these symptoms. The Rotary Drive Assy., RG5-7842, has two motors, a magnet, and a few gears in the machine's top-right. The magnet pulls a plate that has two offset teeth to catch the carousel drive shaft, locking it into printing position. It releases the carousel when energised. In my case, the magnet was sticky. Apparently the carousel was allowed to coast beyond its stopping point, so the toners almost never lined up. I'm not sure whether the magnet was permanently magnetized, or the felt pad under the plate had something sticky in it. The magnet is available alone as RH7-5384, but I didn't want to take a chance on having to do the repair twice, in case it was really a weak motor.

The machine didn't detect the positioning problem. It happily printed white pages with only a little extra noise. One configuration page came out with only yellow toner, and the customer found she could get a print sometimes by selecting grayscale, but most prints were pure white.

Works fine now.
by Eric Sandbo on Sep 19, 2008 at 4:05pm Add comment
hello i have a hp color laserjet 2550L it printing only a yellow after it printing blank
by unknown on Nov 10, 2011 at 7:29am Add comment