03-16-2007 03:13 AM
03-16-2007 12:22 PM
03-19-2007 03:09 PM
Almost certainly your carousel is out of index: That is the drive gears at the top of the carousel gears on each side are a tooth or two off. To check this, open the top cover and remove the cartridge exposed (if possible). Check the track down into the carousel and see if the arrows on each side line up with the track. If not, you must remove the top cover and index the carousel gears with their drive gears above. See the indexing marks shown in the service manual.
Pull the black carousel gear inward and push the white drive gear outward until you can skip a tooth or two to get it back in index.
03-20-2007 01:31 AM
03-20-2007 10:12 AM
I wanted to let you know that I went ahead and followed the instructions kindly supplied by Don. The printer is now printing. The prints are unreadible but at least it is printing something now. The prints that are coming out are banded and go dark to light, fron top to bottom of each sentence. Wierd. So, I think that I also have another problem. I found this on another post by Leah Stephens. I hope it helps.
Rotate the carousel so that the marker for the yellow print cartridge faces the front of the printer.
Examine the gears: two marks on the smaller gear should line up with the single mark on the large gear (see the detail in figure 30 below).
NOTE: The single mark on the larger gear is adjacent to the slot for the black cartridge, marked with a "K".
If the gears are not aligned correctly, locate the marks on the gears and realign the gears.
11-14-2008 06:54 PM
11-11-2009 07:24 PM
place when the carousel turned. I traced
this down to the relay solenoid that locked the carousel in place, it was
sticking in the up position even after the
power to it was cut off.
Originally the solenoid had a felt pad
for the striker to strike against in the
up position, I thought possibly to soften the noise of it clattering back and forth.
Anyhow the felt had worn away leaving a sticky glue behind, thus the solenoid intermittently did not
fall back down when it should,
thus the carousel would turn too far, making it impossible to change cartridges or wander while trying to transfer an image causing a no color to show up for that color.
So I cleaned off the glue, and the printer started printing white pages. In watching the solenoid I noticed that it NEVER
fell back down when power was removed. In fact I took the solenoid out, powered it up, and removed the plug from the printer and the
striker remained tightly clasped to the solenoid.
Turns out this is the result of paramagnatism, the solenoid becomes a magnet
while power is applied, and that induces an
opposite magnet in the striker, and when the power is removed, the two continue to magnetize each other thus creating a continued
attraction. The spring on the relay was NOT
strong enough to break the paramag attraction. However if I manually opened
the relay, the paramag vanished and the striker
woldn't stick any more until it was powered
The paramag was caused by a complete circuit in the striker because the striker
was connected to the metal case at the fulcrum end and also at the front landing pad where the felt used to be. The paramag depended on that closed loop to maintain the effect.
By putting a piece of tape on the landing pad the paramag effect went away and the solenoid started to work right, namely release when the power was cut to it, and the printer started to print perfectly again,
because the carousel was locking properly
into place every time.
11-20-2009 01:07 AM
This is on a laserjet 2500 fyi
Great information exchange site here HP!!!!!
12-14-2009 05:34 AM
My prints are blank. Also the internal pages are bad (not totally blank).
Reading through the possible solutions it is not clear to me.
Should I take out the yellow cartridge and drum or can I easily reach the gears?
can somebody help me with pictures of the markings? I cannot find them.
11-15-2012 06:27 AM
Greetings, I have a problem with my HP 2500L and it prints really only in yellow. Everything I have read says to remove the lock solenoid and check the foam like pad on it.
I do not know where the solenoid is or how to remove it. Please let me know, Thanks!