HP 3600 Paper Loop Sensor location

[jpar2]

My CLJ 3600 printer will not initialize due to false paper jam indicator.  Messages alternate between 13.20.00 JAM INSIDE FRONT DOOR and 13.20.00 FUSER JAM INSIDE TOP COVER.  

I enable the paper sensors in diagnostic men and see that sensor B=1and will not go to zero. Service manual says sensor B is paper loop sensor. I need help finding the physical location of the sensor so I can replace or repair it.  The service manual does not show where the sensor is located.  

Can anyone identify this sensor, please?  

Thank you.

[Valsimot · Accepted solution]

Service manual page 54  SR6001

Remove fuser, look fuser from the bottom side, sensor lever should be in the middle, follow sensor lever to sensor itself.

[jpar2]

Thank you for the prompt response.  I suspected that might be the paper loop sensor, but it does not reset the sensor B on the Manual sensor test when I move it.  I had replaced the fuser earlier, but nothing changed.  So, perhaps there is a faulty connector, or the new fuser has a bad switch also.  I will look more closely at the switch now. 

Thanks again.

[jpar2]

I verified there is nothing wrong with the paper loop sensor on the bottom of the fuser.  I tried two different fusers, but I  cannot get that sensor B to turn off (manual sensor test).  My question now is, how can I override sensor B to allow the printer to run a full diagnostic test?

Thank you,

[Valsimot]

Are you 100% sure both fusers are working properly, can you test them in another printer?  The small fuser gears are without damages or missing teeth?

[jpar2]

I have only the one printer.  The first fuser is original to the printer.  The second is a new replacement that I ordered online from a third-party vendor.  The printer has only 36,100 original pages printed.  It is possible, but unlikely that both fusers have the same problem. 

[jpar2]

You are correct.  Both fusers were bad with the same problem, even though the second was a new (actually a re-manufactured) fuser right out of the box.  A third fuser solved the problem.  Thank you for your expert advice.