The two large wheels pull the paper into the machine. Once the paper is halfway in it stops and the jam light comes on. It seems like a timing issue. The paper buckles a bit when entering the feed rollers. Dan
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your wheel on one side is impacted with small pieces of paper this causes the paper flow to go unevenly you need to clean you wheels on both sides oil them and wipe dry with a paper towel then do the paper feed jam clear and let a few pieces go thru to pick up any remiaining debris
Riso's are famous for this, i will scrub the rubber timing
roll with rubber rejuvenator and clean the steel roll with alcohol.The riso
paper feed clutches are weak compared to what they were in this series you may
have to replace the clutch. Bud, after doing some research you need to clean
the oneway bearings on the pickup and feed rolls, adjust feed table hieght and
lastly check/adjust timing in drive and feed roller-you will need a manual for
I have had paper jams in five different places on this machine. It has jammed at the pickup point from the tray, in which case you have to remove the paper tray and pull the jammed paper out. It has jammed at the manual paper feed tray, in which case you just have to pull the jammed paper out of the feed rollers. It has jammed at the toner/drum, in which case you have to open the front cover and pull the toner cartridge out to remove the jam. It has jammed in the back of the machine where the paper feeds through to the output tray, in which case you have to open the small back panel and remove the paper. And it has jammed in the output rollers, in which case you have to reach inside the output tray and remove the paper. Then once the jam is cleared there are times when the machine has to be unplugged for up to 8 hours to reset before it will function properly.
what happens sometimes is the rear side of the registration (shiny silver color) roller becomes worn down so bad that the spring cannot grab properly. the registration roller, in this case, would have to be replaced.
the way to check is by getting to the back of the machine, and if this is the cause, the spring should be a little wobbly on the shaft. with a new roller, the spring fits snug, and grabs properly for it to feed.
Is this something that has been getting worse or just happen at once? If it just appeared it good be something in the paper tray stopping it from liftting or something behind the paper tray or in the paper path of the copier. If it has been slowly happen try to clean the paper pickup rollers with WD-40 and a rag and clean the rubber only. If that works you done, but if it say's to add paper you may have a broken paper present sensor. The jams could also be the paper feed clutch is worn out. Worse case use the bypass tray. Good Luck!!