Tray1 jam

[teklife256]

Working on a MX-M623N with an intermittent Tray1 jam. The mfp has 29k clicks. During a multiple page copy or print job the code will occur several pages into the run. The paper path is clear, completed prints/copies continue to the finisher tray and the paper remains in the tray1 apparently not picked up. Rather than a mid cycle jam with paper throughout the paper path the successful prints prior to Tray1 jam code continue on to the finisher tray. The jam code can be cleared by opening and closing the drawer and left side doors. The paper does seem to be excessive on dust. Sim 30-2 allowed me to confirm a working T1PPD sensor.

Any ideas on this?

what I find interesting is that the machine continues to complete prints prior to the jam. Why wouldn't the machine immediately jam?

[blackcat4866]

Re: Tray1 jam

I would remove the tray #1 feed assembly but leave the wiring connected, then check the sensor outputs. I've seen a large number of Sharp paper sensor photointerrupter failures, especially at the feed unit. =^..^=

[igi]

Re: Tray1 jam

hi check what gives rotation to the feed roller
add washers behind the clutch,and check double feed prevention roller that it turns

[faxman28]

Re: Tray1 jam

if it jams around every 5 to 10 pages , you may have a tray lift issue , Check behind the tray for any paper stuck against rear of unit. if the jam history shows ttray1 or tray1, that is a no feed jam. try new feed rollers, make sure paper in tray 1 is not folded over, have had just one page folded over and it was the cause of the jamming.

[teklife256]

Re: Tray1 jam

Blackcat, I will check the sensors again that I may have missed in sims. True with the photointerrupt sensors that I replaced a few myself, not fun troubleshooting when they are failing intermittently. When I show up to respond to a service call the sensor seems to realize it's days are numbered and acts right.

Igi, washers behind the clutch? Thats a new one for me.what's that about? A better bite?

Faxman, the tray was fully extended and I didn't see anything back in there. The rollers are in good shape but will swap with others.

Heading back today to go another round.

[spanky]

Re: Tray1 jam

This is most likely caused by the torque limiter on the feed roller.

It has one way bearings, and you know how they can slip.

Clean the torque limiter with alcohol and clean the shaft with a scotch brite pad.

I would replace it as soon as possible.

[blackcat4866]

Re: Tray1 jam

I'm passing along the advice of a long time friend of Copytechnet:

Any of the MX or MXM machines with that style tandem tray 1 & 2 design (eg, MX5500-7001, MX6240-7500, MXM623-753 etc etc), with a symptom of feeding 5-10 sheets then stopping for a Tray 1 or Tray 2 jam code, is caused by a bent paper feed arm coupling on the engine. This has nothing to do with the actual tandem tray itself.
When the tandem tray is closed, it connects up with the paper feed arm coupling for each tray to correctly place the PF roller and paper empty sensor lever in the right position.
The paper feed arm coupling is the white plastic circular piece on the rear frame, connected to a solenoid each.
These couplings get bent backwards and no longer connect with the closed tandem tray because of a previously very overloaded tray. The top section of the tandem tray is forcefully lifted way too high by the overloaded paper, and when the tray is closed the coupling is bent backwards as the matching circular piece on the tandem tray is no longer in the correct height and therefore bends it backwards.
The fix is easy.... Remove the tandem tray from the rails (4 shoulder screws), reach in and bend the coupling arm forward to be the same as the other tray coupling arm.
Tray 1 coupling arm is shown on parts guide section 74, item 60 and the tray 2 coupling arm is shown in parts guide section 65, item 40 for the model in question.
The coupling sits on a metal plate. That's the part that gets bent backwards, so its just a matter of pulling it forwards again so the tandem tray and the feed coupling arm make proper contact.

I can't believe this hasn't been fixed. I see this a lot, especially with new machines where the customer is not used to the tandem tray design and goes crazy with the paper loading. Its very easy to overload the tandem trays with up to 250+ sheets more than the maximum fill line.
I always end up writing on the tray with a black texta/sharpie pen ''only fill to red line'' to prevent this from happening again.

=^..^=