20-21 PC-416 intermittent

[femaster]

When it makes a noise and jams up on t3 only its always been slippong belt for one of the motors. The one that drives vertical relay black rollers. The way I managed to fix it was to re fit the motor by slightly pushing it to the right to apply more tension on the belt. I know it's not much because of the 3 screws that hold it in place but it's usually enough to stretch the belt. You could also make the holes in the motor assy a tad bigger. That would give you more side movement and more tension on the belt.

Thanks for the suggestion. None of the belts were overly loose to begin with, but I snugged them up anyway. Slightly snugger on the first attempt, and then tight to the point I was uneasy about possibly shredding a belt the second go at it. Unfortunately the problem remains. I'm going to have to guess that the noise is not a belt slipping at this point. No way either of the belts could have slipped with as tight as they were on the second attempt. Now to try out a few of the other suggestions.

[femaster]

Yikes, Optical sensor was changed with the other feed assy i assume. Here's a shot in the dark, since it sounds like there's almost nothing you've not touched or changed. Replace both feed and sep rollers with a blacked ribbed A64J564201 pick-up tire.

OK, gave this a go, unfortunately same result, J20-21 jam. I honestly was skeptical that this was going to work at all, but it did, and was only slightly louder than typical. Back to the drawing board.

[4Toon]

OK, gave this a go, unfortunately same result, J20-21 jam. I honestly was skeptical that this was going to work at all, but it did, and was only slightly louder than typical. Back to the drawing board.

On a working PC unit, it works and you get about 600k on the tires. I do that combo in high-volume schools. I was hoping adding more grip would change something. When you manually flag the optical sensor in the paper path, does it change states in service mode? Have you tested the other sensors in the feed system and checked the On/Off status in service mode?

[femaster]

On a working PC unit, it works and you get about 600k on the tires. I do that combo in high-volume schools. I was hoping adding more grip would change something. When you manually flag the optical sensor in the paper path, does it change states in service mode? Have you tested the other sensors in the feed system and checked the On/Off status in service mode?

I may have to experiment with those ribbed tires. We have a lot of very high volume schools that could definitely benefit from a set of tires that lasts longer then 100K to 130K pages before they start jamming due to tire wear.

Yes, all sensors were tested and verified functional. Since 2 other feed units (and a whole different main copier body) were tested with it also and nothing changed, I figure we're not dealing with a sensor issue. I think at this point I'm going to have to chock it up to something with the frame of the paper cabinet being tweak just enough to cause a problem, but not enough to be visually noticeable. I'm literally at the point where I have moved everything (even the tiny plastic through the chassis connectors that the feed unit plugs into) from a working PC-416 onto this one and there has literally been no change in the jamming problem.

[Tech09]

I had one that I had replaced everything listed so far, but when I replaced the whole feed assembly I had to flex it a little to seat fully. I can only assume the frame of the PC was warped, which sadly, does not surprise me anymore. We've had a number of machines shipped to us that have the cardboard boxes look good, no dents, nothing caved in, but when we unbox the copier we've found multiple ADFs damaged, platen glasses broken, optics frames bent and the last one the whole frame of the copier was twisted.