Sharp BP70M75 Duplex jams

[whydowedothis]

Hello,

First time using the forums to look for assistance. I service close to 15 BP70M75 within the same school district and I have been battling these machines with duplex printing or copying.

Users are experiencing (and me observing) the machines throwing APPD2_N codes intermittently. There is no crashing of the pages or sound before jamming it just stops.
Now I have called Sharp support asking for assistance multiple times with some being on different machines but same problems. Things I have done for most devices are:

Clean and inspect duplex rollers and paper path.
Replace both duplex sensors APPD1 and APPD2.
Increased tension by 1 loop on both sensor housings of duplex units.
For only 2 machines I have replaced a wire harness (DHAI-6227FCP1)

Currently have 2 open cases for machines with this duplex jamming issue. Both of them being the ones I replaced the wire harness on.

Weird thing about this problem is it can jam twice in 50 pages but then go 200 without a problem. I know the _N part means the paper hasn't reached the sensor in time indicating a timing issue.

Also, a slight observation I made is that there are also 15-20 BP 70M90 machines that I also service within the same district that have NO issues at all with most over a million on the counter. Which in turn would eliminate paper being an issue (which is something I was told is the issue).

Any help would be so appreciated as well as knowing I'm not the only having this issue.

[ihatefinishers13]

Hello,

First time using the forums to look for assistance. I service close to 15 BP70M75 within the same school district and I have been battling these machines with duplex printing or copying.

Users are experiencing (and me observing) the machines throwing APPD2_N codes intermittently. There is no crashing of the pages or sound before jamming it just stops.
Now I have called Sharp support asking for assistance multiple times with some being on different machines but same problems. Things I have done for most devices are:

Clean and inspect duplex rollers and paper path.
Replace both duplex sensors APPD1 and APPD2.
Increased tension by 1 loop on both sensor housings of duplex units.
For only 2 machines I have replaced a wire harness (DHAI-6227FCP1)

Currently have 2 open cases for machines with this duplex jamming issue. Both of them being the ones I replaced the wire harness on.

Weird thing about this problem is it can jam twice in 50 pages but then go 200 without a problem. I know the _N part means the paper hasn't reached the sensor in time indicating a timing issue.

Also, a slight observation I made is that there are also 15-20 BP 70M90 machines that I also service within the same district that have NO issues at all with most over a million on the counter. Which in turn would eliminate paper being an issue (which is something I was told is the issue).

Any help would be so appreciated as well as knowing I'm not the only having this issue.

*I'm going to preface this by stating that we've never had this model before*

I don't want to be that guy... But... Being that they're all at the same customer... The paper is prime suspect for me. Find the most problematic machine, put a few reams of YOUR OWN paper in it. We had similar issues, all different jam codes with 50 MXM565's with one customer, and once they changed paper to a different manufacturer, the jamming stopped.

Other than that, we did have a ton of issues on that 565 series as well with F2-78, in which the sensor on the right side door had some issues, and some of those issues were resolved with replacing the connector between the door and mainframe. Not sure if the 70M75 has that, but could be something.

[nanohitmen]

drop tray or finisher?

[whydowedothis]

drop tray or finisher?

They have finishers all using FN-34's

[whydowedothis]

*I'm going to preface this by stating that we've never had this model before*

I don't want to be that guy... But... Being that they're all at the same customer... The paper is prime suspect for me. Find the most problematic machine, put a few reams of YOUR OWN paper in it. We had similar issues, all different jam codes with 50 MXM565's with one customer, and once they changed paper to a different manufacturer, the jamming stopped.

Other than that, we did have a ton of issues on that 565 series as well with F2-78, in which the sensor on the right side door had some issues, and some of those issues were resolved with replacing the connector between the door and mainframe. Not sure if the 70M75 has that, but could be something.

Now while I agree that paper is a suspect we did bring a machine back into our warehouse and used our paper. Machine still jammed until we replaced both sensors, but this was only temporary as the problem is back again. Also to rule our the paper is that the high schools use the same paper on the 70M90 model and they have no issues.

[bilyahn]

Will be very interested in the solution for this. I have 18 of the 70M65 models and have not come across this. Mine are at a school also but have only been running for 4 months. I'm surprised that Sharp isn't recommending a board replacement!!! There is a production firmware update from March 25th, have you tried that?

Oops just realized your machine is the same as the M7570s. Mine are not the same....

Good luck

Bil

[ihatefinishers13]

So if you replaced the sensors, it worked temporarily and came back eventually, that means the sensors were bad, but ALSO whatever triggers those (digitally, I would assume PCU PWB, if not a relay PWB), is causing them to go bad. Usually happens with motors, but it can happen to sensors as well. The other thing as well, is the power supplied actually 20A, and a dedicated line? If nobody else has this issue, but your machines do, it's definitely a possibility. I hate thinking it could be the issue because it's ridiculous that it even needs it, but Sharp will tell you that, too. I'm just spit-balling ideas from troubleshooting experience.