Hi Guys, I have a MPC8002 with tandem tray issues. Once the RH side of the tray runs out of paper the LH side starts feeding paper over to the RH side as per normal, but the paper is only moved about 30mm towards the RH side. The lift tray then raises thinking the paper has been transfered over, which of course it hasn't. There is no delay or slipping of the LH side rear fence which drives the paper across and the paper is not catching on anything, it appears the machine is just screwed up with it's timing. The result is an error saying the paper is over it's limit mark. I've actioned the tech bulletins and updated all the firmware. Any ideas?
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Re: MPC8002 Tandem Tray
Check the white gear and black pulley that drive the paper from the LHS to the right. The "D" shape in the middle turns into an "O". Looks OK to the naked eye but when you load them up with 3 reams of paper the nylon stretches and spins on the shaft. Frequently replaced parts, our techs keep them in their tool bags.At least 50% of IT is a solution looking for a problem. -
Re: MPC8002 Tandem Tray
The control of the rear fence for moving the paper from the left to the right is not a timing factor. It is controlled by 2 sensors. The rear fence home position sensor and the rear fence return sensor. Most likely the rear fence return sensor has a scrap of paper on it that as soon as the fence leaves the HP sensor, the machine thinks the fence has reached the right limit of travel.Comment
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Re: MPC8002 Tandem Tray
Hi Guys, thanks for the replies. Sadly the drive pulley for the end fence is intact.
Also I've checked the 2 end fence sensors (HP and Return) through input checks and they are functioning fine. I have also driven the end fence motor through output checks without a problem. Really annoying.Comment
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Re: MPC8002 Tandem Tray
Thanks for the reply, but no it's not the pulley issue.
For some reason the RH side of the paper tray thinks the paper has been tranfered over and starts to lift even though the LH end fence drive motor has only been driving for a fraction of a second and has only had a chance to drive the paper 20 - 30mm towards the RH hand side.Comment
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Re: MPC8002 Tandem Tray
Since the sensors check good, you may want to take a peek at the rear connectors on the machine for the tandem tray. A small sliver of paper shoved into the connector will cause strange things to happen.NEVER ASSUME ANYTHINGComment
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Re: MPC8002 Tandem Tray
Mr Edge,
Did you find the trouble with the tandem tray issue? I don't mean to hijack your thread but I have a MPC6000 that has a weird problem, the RT tray will run out of paper, the machine shows that tray empty then the left tray starts to shift the left stack over but the RT tray lift plate never lowers so the paper stack is jammed under the RT lift plate. The RT tray back fence is NOT bent and the lift plate falls perfect when the tray is pulled out. I have done firmware and replaced lift motor and paper board with known good ones. Also I can't seem to find the output SP code to test the tandem tray lift motor operation if it exists?Comment
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Re: MPC8002 Tandem Tray
The side guides are fine and the lift plate falls perfectly when the tray is released from the lift motor. It appears the lift motor does not reverse to lower the plate when paper empty condition. No paper in the connector and the rail screws are not loose. Is it possible to swap the 1st feed assy with the 2nd?Comment
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Re: MPC8002 Tandem Tray
I didn't even think about the fact that this is the same model series as the MP C6502. The sensors on the right tandem tray on these can be a major pain. They are mounted on a rather thin metal plate in back of the tray in stead of on the back of the tray. The plate is prone to flexing and causing multiple errors. Check that the bottom limit sensor is not being falsely triggered.
I had one machine that in the course of two days indicated that the tray was over filled when it was empty, that it was empty when it was full and finally that the drawer was not closed when it was. I finally found that the flag on the remnants of what had been the rear gate tat open for the paper to slide over on older tandem trays was not always fully entering the sensor. Used a piece of gum label to extend the flag and no more problems.Comment
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Re: MPC8002 Tandem Tray
HI Guys
Thanks for all the posts. The problem I've been having with the tandem tray has now been resolved. It turned out there were 2 problems. The first was the RH tray rear gate was not activating the sensor correctly, I've used a piece of tape to increase the size of the tab on the gate so the sensor now knows the gate position. I would suggest this be done on all the machines as the design seems a little flakey to me. Once I'd done this the LH stack would transfer OK but the RH side would not lift and the LH end fence would not return. I replaced both the "home position" and "return" sensor (even though these both checked fine using input checks in SP mode, but I have noticed the photo interupters in the 02 series don't seem to be as reliable as in previous models). Tandem tray now working perfectly. The combination of both these problems had the tandem tray doing some very strange things!
Cheers
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