Possible output sensor fault in Laserjet 2600n after jam

[davidzuts]

First off the sensor is not magnetic but a photo sensor where it shines a beam across to a receptor.  When the beam is broken the printer knows the flag is in a certain position.  Now there are 2 sensors and flags you need to worry about.  The bin sensor which tells the printer when the paper has cleared that position and also lets the printer know when the bin is full since the flag can not drop down.  The other sensor is the sensor in the fuser itself which is activated as the paper moves thru the fuser.  You need to make sure there is not a scrap of paper still in the fuser keeping that flag in the wrong position.  Easy thing to do if you have the covers off is to remove the fuser like you are replacing it and then turning the gear by hand once removed to make sure no paper is still stuck inside where you can not see it.  Resets willl not help since the error you are getting is a hardware error where the printer is seeing something jamed in the path.  Also since this happened after a paper jam odds are 99% a flag or there is still paper stuck effecting a flag.

[boatey]

Many thanks for all the help.Just hefore going to the dump, I had one more shot.

I got a magnifier and torch and checked between the insides of the last output rollers, and there was what appeared to be a ribbed white rubber roller inside. After fiddling with fine tweezers and medical scissor clamps I was able to tease up an edge, and lo, it was a sheet of paper concertina compressed to the diameter of a thin pencil. It took me an hour to gently work it out without breaking anything, and after putting the bits back on, the printer is now fine. The power in the output stage is phenomenal...

I appreciate all the help. I am amazed that a complete sheet of paper could be compacted so tightly that neither end shows.

[GaryL1]

Hey David,

Not arguing because you are way ahead of me in knowledge, esoecially in color units... But SR4 is optical/photo? 

Now you have me on a mission.  Where is this optical sensor?  I must find it so I can give myself a swift kick in the rear end for not even knowing it was there. I have manual ID# Q6455-90930.  If you have the same one, please just mention the page.  I spotted a 2605 in the recycle pile I told the guys to put to the side for me.

Like I mentioned I had only worked on my own little unit (I specialized in workgroup monochrome) and my techs do not work on sub-$500 units. 

The dentist mirror works wonders.  I am glad he found the paper.  We call those "accordians" after the old Polka music makers.  I always supply one of those mirrors, a small and powerful LED flashlight and a pair of 10" curved tip hemostats to every tech.    All are available at Harbor Freight Tools or any decent sized tool outlet.

Thanks!

Gary