DP 420 misfeeding problem

[happicopy]

Have any one encountered problem like this with DP 420 ( on TA 221)?
when the adf feeds the (originals) paper it makes loud clicking noise, apparently the edge of the paper hits the edge of the frame when passing thru the loop specially on the middle to back part before entering the eject side.
sometimes the original jam sometimes it passes thru ( but with loud click). and the upper portion of the copy is like a one line blurred.
i have tried adjustment on the left and right hinge, clean all the rollers etc. even adjustment on Sim 942 still the problem persist.
BTW the 5 film guide is intact, i have noticed that the paper edge is hitting the area near the film guide specially on the middle to back of the adf.

[subaro]

Re: DP 420 misfeeding problem

Just finished repairing one of those today, but this one was the dp-470 for the ta-255-305. They are all built with similar design. As long you are getting jam, you have to open up look inside for broken or bent parts. mainly the switchback guide tooths get bent from removing paper jams and also the mylar gets bent back or twisted . The clicking sound is normal for this adf.
The one i repaired today, had one of the switch back pulley support broken and the roller was not stable causing the paper to twist and jam. I have repaired a few of these and never the sensors or clutches or gears go bad.
There is no disassemble procedure for this adf, so you have to figure out stuff on your own. if you are going to attempt the repair let me know and i'll give you some tips.
The one i repaired today, gave me a problem where after every copy the adf would keep running and then come up with a 9000 jam code. I had seen this before and could not remember what was the fix and a bit stumped. anyway service mode u244 showed the original sensor was at 1 when should be zero when closed. pull the sensor assy off and blocked the sensor and it checked good.
The solution was simple but tricky. put back in the sensor assy and the rear inside cover was not sitting properly, so when the adf closed, the flag made contact properly.
just trying to show a bit of the problem and fix here.

[c.olivieri]

Re: DP 420 misfeeding problem

I also had the problems described by happicopy. I have 5 TA221 with the DP-420 and the only solution I have found, it is to replace the 5 film guides.

Have you solved the problems?
Thank you
C.Olivieri Olbia (Italy)

[Tonerkiller]

Re: DP 420 misfeeding problem

I think there was a bulletin on this

[subaro]

Re: DP 420 misfeeding problem

I think there was a bulletin on this

Yes, there was a bulletin on this, and i thought i downloaded it, but i can't find it. The service manual has no disassembly procedure and the bulletin has the complete teardown and fixes. It's not difficult, but you have to pay attention when reinstalling the switchback guide assy or it will bend the guide tooths.

Might add, not sure if was the dp-420, but i worked on the dp 773 which is very similar.

[dickierock]

Re: DP 420 misfeeding problem

These feeders are a bit flimsy to me,prone to warping. The left hinge can be an issue as well, causing the feeder not to sit square. Also I have replaced those mylar as per the bulletin, seemed to help.

[daveh12]

Re: DP 420 misfeeding problem

Have any one encountered problem like this with DP 420 ( on TA 221)?
when the adf feeds the (originals) paper it makes loud clicking noise, apparently the edge of the paper hits the edge of the frame when passing thru the loop specially on the middle to back part before entering the eject side.
sometimes the original jam sometimes it passes thru ( but with loud click). and the upper portion of the copy is like a one line blurred.
i have tried adjustment on the left and right hinge, clean all the rollers etc. even adjustment on Sim 942 still the problem persist.
BTW the 5 film guide is intact, i have noticed that the paper edge is hitting the area near the film guide specially on the middle to back of the adf.

I have seen this all too often. When the original goes through the DP without jamming does it still "dog ear" after the loud clicking sound? And the copy slightly warps on the left side of the page?
The left hinge is always the cause in this case. Have tried adjusting/repairing them but never had any success. Replace with a new one and it works perfect.
You can test it, with the DP down before you put your original into it, push the top of the DP down with the palm of your hand just over the left hinge and then do your copy.


Sent from my iPhone using Tapatalk