Re: Unit is saying "Paper Not Detected" - HP Support Community

VPTech65 · ‎07-08-2022

I saw another post about this but it was too old to reply too. My T730 is saying paper not detected. I replaced the print head because it was the original from 2018 and was leaky but I believe it may have gotten the optical sensor dirty. I've read that the optical sensor is part of the carriage assembly but can you please tell me exactly where it's located and if I'll have to disassemble anything in order to try cleaning it? I'm hoping I can do enough cleaning to get it to work without having to replace the entire ink service station. I've already checked and cleaned the mechanical optical sensor behind the 81/2X11 paper tray.

Thanks

Repairatrooper · ‎07-08-2022

the sensor is mounted on the carriage assembly, see diagram below (red arrow in diagram below). The problem is that in some cases when the head has leaked it soaks the cleaning brush that is supposed to keep the sensor free of debris (see green arrow). When that happens it is nearly impossible to clean and is not offered as a separate part so you will want to examine the service station closely before starting to save time.

If you find the information provided useful or solves your problems, help other users find the solution easier by giving kudos and marking my post as an accepted solution.
I am a volunteer, offering my knowledge to support fellow users, I do not work for HP nor speak for HP.

VPTech65 · ‎07-08-2022

Thanks much for the reply and picture. Sorry I'm a total newbie to working on one of these and not at all familiar with it . What area of the machine was this picture taken, and is this a T730 like mine? I'm not seeing anything that looks like this in there. I'm looking at the area around the print head. Should I be looking somewhere else? Thanks again

Repairatrooper · ‎07-09-2022

This picture is from service documentation and what you are seeing is the printer with the right cover removed so that the service station and carriage is visible.

If you find the information provided useful or solves your problems, help other users find the solution easier by giving kudos and marking my post as an accepted solution.
I am a volunteer, offering my knowledge to support fellow users, I do not work for HP nor speak for HP.

D Hook · ‎07-10-2022

Here's a link to the service manual Repairtrooper was talking about:

https://www.laserexpressinc.com/manuals/HP/hp-dsj-t730-t830-mfp-service-manual.pdf

Taking off the covers isn't difficult. You'll need some torx head screw drivers. And be sure to read the instructions carefully before beginning.

Good luck. Let us know how it comes out.

I don't work for HP....I just repair their printers.

Unit is saying "Paper Not Detected"

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