MPC 3500 jams only when sending copy or print to the top tray

[copyman20]

I have a MPC 3501 that is jamming in the 790 top tray of the finisher. you can send it to the internal tray or the shift tray, work great. when you send to the top tray, it will jam with the paper sticking halfway out. I have replaced the enterance sensor to the finisher, also replace the door switches to the bridge unit.

anyone every see such an issue?

Thanks

[ruben]

Re: MPC 3500 jams only when sending copy or print to the top tray

There is very little that can go wrong with the top tray, it is pretty much a straight path. What does the logging data say?

[copyman20]

Re: MPC 3500 jams only when sending copy or print to the top tray

SMC logged data shows the condition was triggered by the finisher enterance sensor.

[collme]

Re: MPC 3500 jams only when sending copy or print to the top tray

make sure the roller shaft bushings are cleaned out and lubricated, have had these rollers slowing down due to the shafts binding in the bushings, gave this exact fault.

[copyman20]

Re: MPC 3500 jams only when sending copy or print to the top tray

do you mean the rolllers in the finisher or the one for the bridge unit?

[collme]

Re: MPC 3500 jams only when sending copy or print to the top tray

do you mean the rolllers in the finisher or the one for the bridge unit?

entrance to the finisher, on the finisher, also there is a deflector or junction gate under the top door on the finisher which can come adrift at the front end, there is a spring that goes missing but the customer has been able to refit the junction gate not realising there is a spring there, this would normally give jams to both trays though.

[slimslob]

Re: MPC 3500 jams only when sending copy or print to the top tray

My guess is that the paper is slowing down once the trail edge leaves the bridge unit. This is causing the trail edge to be late in leaving the finisher entrance sensor. Check the top cover to make sure both transport roller sets are making proper contact with the paper and that all rollers driven by the finisher upper transport motor turn freely.

[mohan]

Re: MPC 3500 jams only when sending copy or print to the top tray

I have a MPC 3501 that is jamming in the 790 top tray of the finisher. you can send it to the internal tray or the shift tray, work great. when you send to the top tray, it will jam with the paper sticking halfway out. I have replaced the enterance sensor to the finisher, also replace the door switches to the bridge unit.

anyone every see such an issue?

Thanks

'
SR790's are supplied with an additional plastic guide that is meant to clip on to the bridge unit. A lot of of PDI teams do not fit this because the installation instructions are unclear about where it meant to be fitted. This can also cause problems because there is a slight curl in the paper that can create problems. You may want check if this guide is missing. (It is meant to be clipped into the recess at the exit of the bridge unit)

[kwehner]

Re: MPC 3500 jams only when sending copy or print to the top tray

Is this a new install? I have also seen this if an older version of the SR790 is installed on a newer machine. The only difference between the old finishers and the newer ones is the control board.

[teebee1234]

Re: MPC 3500 jams only when sending copy or print to the top tray

Also check that the top cover of the finisher is seated correctly. It's possible for the proof tray to be rubbing on the exit rollers due to the lower edge of the tray not seated right.

[mikadonovan]

Re: MPC 3500 jams only when sending copy or print to the top tray

Jamming in the proof tray on a 790 is usually caused by a couple of things. Make sure the black gate ( lift up the top cover) is not broken, out of place, or the spring is missing. The other issue is lack of pressure on the white exit idler pulleys. You can remove the pulleys easily and bend the flat springs up to increase pressure. Oh, and make sure the entrance guide has been installed on the finisher.

[Dhearn]

Check to make sure that these guide are installed if they are suppose to be # 6 in the manual. They ate installed at the paper exit on the machine.

[redneckstylin]

Re: MPC 3500 jams only when sending copy or print to the top tray

- clean rollers under top cover of 790
- check mylar on bridge unit
- check entrance sensor sometimes they get stuck and bent outta shape

[chuck cota]

Re: MPC 3500 jams only when sending copy or print to the top tray

Hello,
I have had this several times with the 790 finisher.

The first thing I check is the metal bracket that the finisher entrance sensor is attached to. The bracket is very flimsy and can get bent. Make sure its straight.

If the bracket is not the issue then you either have a top cover that is out of place or one of the fins on the inside of the top cover is worn from copy paper crashing into it. Look for burs or grooves in the fins.

Finally, if none of thesenare the issue then look at the black plastic flapper that directs the paper to the upper tray or down to the shift tray. There is a spring on the front side of it that can come off, causing it to be in the wrong position.

I hope this helps

[TonerMunkeh]

Is this a new install? I have also seen this if an older version of the SR790 is installed on a newer machine. The only difference between the old finishers and the newer ones is the control board.

That's only for the Alex series of machines, not the Apollon or Athena. Good shout tho.