MP 1100 Dog Ears Calling All High Volume Experts

[schooltech]

Yeah, those do suck because you'll still be thinking about that machine and how you never did find the problem. I've found that no matter how many machines I mentally "sweep under the rug" they almost always come back to bite me in the ass somewhere in the future.

So, 1/2 a pallet later and the machine is crusing along? Maybe some of the previous paper was cut a bit too close to the end of the paper roll at the mill or something and had just a bit too much of an inherent curl to it, even beyond what your eyes picked up. The other thing is that as you went through it and inspected all of the parts, something just seated better or meshed better after your inspection and may come back sometime in the future. Definitely a tough one.

As much paper as we run, it amazes me that I don't get as much bad paper as I would expect from running through about 45 pallets of paper per year, which is about nine million sheets.

[Shadow1]

A little teflon grease in the terminal cavities greatly extends the life of the corona assemblies. Just take a Q-tip and paint the inside liberally - don't even have to take the wires out. I went from just replacing the entire assembly every PM and never bothering to restring wires to getting 1.5 to 2M before they die.

I agree it sucks when a machine fixes itself - I have enough to do without the gremlins screwing with my mind...

As for your jamming problem, I strongly suspect the strippers or spurs had an itsy bitsy teensy weensy spot of toner stuck on them, and something finally hit it hard enough to knock it loose, but one last idea: How do the static brushes look in there. We usually have more than enough humidity to prevent problems like this, but every once in a while it gets dry enough to be a problem. It usually drives us nuts for a few days untill we figure out what is going on - we start seeing all sorts of strange things; problems we're not used to dealing with and can't explain untill we account for the weather. More than once we realized it was unusually dry and found a static brush worn to nothing.

[_Brent_]

Another good thing on the SC 300, I noticed arc marks on the corona end caps. I installed electrical tape on the areas where I noticed the arcs and have not had any problems. Keep that NIP adjustment in mind if your dog ears return. I just had a call like that last night, changed fuser rolls, fuser exit assembly, paper exit feed roll shafts and had same problem-intermittent dog ears on simplex/face down prints. After decreasing the NIP, paper was flat

[Shadow1]

I've never run across the need to do this on my big machines, although I've wished several times for the ability to do it on some smaller ones - How does it affect fusing on heavier stock paper?

[_Brent_]

I'm not sure about really heavy weight paper. This particular form was 24lbs. The fusing quality did not seem to be any different after I decreased the nip. Trust me on this one, I really didn't want to change the nip as the printer had been running for a few years with no problems. I thought it was a paper issue, but their second (same exact printer) printer runs the same exact batch of forms with no problems.

[tech07]

Dog Ears

I'm also chasing this problem on a Toshiba 901 ( SAME AS THE RICOH MP ). I haven't narrowed it down yet, but i have 2 of these side by side. went there today..dog earing like crazy.. Swapped the entire fuser unit and the entire exit/belt section. Dog ears stopped immediately..for about 1 thousand copies..then here they came again...25 good ones...2 or 3 dog eared 200 good ones..3 dog ears, etc...I left after a couple hours of frustration..This copier also has a brand new duplex unit with less than 20K copies... Now that I've eleminated these 3 sections, I think I'm gonna pull out the registration unit (pain) and study it. It's gota be in the copier itself because on side 2, the image is very slightly skewed,less than 1mm. I've got 20+ years in the industry and this machine is making me feel like a full rookie...I've nurtured it thru 14 million copies...

[Shadow1]

Are the corners hard folded or just bent? Bent is an exit problem, a hard fold could be anywhere before the fuser or aligning rollers.

I have 2 MP1350's sitting side by side - one of them has perfect registration and skew, the other has a >.5mm rear side skew running 8.5x14 heavy (but in spec) stock. Actually its there on any heavy stock SEF paper.

I know this is a tiny amount of skew and no normal customer would even notice it, but this customer prints short runs or variable data onto preprinted stock with 1mm alignment targets on all 4 corners of both sides - they readily admit that a press would have a tough time with that degree of precision, but the active registration system is why they bought the machine, and they're just passing the spec down from their customer.

I've swapped all the assemblies between machines - no joy, which leads me to believe the frame is warped, or one of the units is not resting properly when seated.

I can get the skew eliminated on the backside if I shim the duplexer to rest crooked - meaning the paper is not turning evenly coming up out of the duplexer, and the stiff paper and short edge into the aligning roller nip just can't straighten it out.

That's a long way to go to say check for nips in the aligning assembly mylars (and stuck labels, etc.) then start playing with the alignment and "resting position" of various units.

[tech07]

High Volume dog ears

OK..I'm pretty sure I've solved my problem. Hope I'm not jinxing myself writing this..It's been 2 days and 45K copies with no call back... It was in the fuser...the lift up upper exit guide with the upper sep. fingers on it..I happened to notice that when closed and resting on the small magnets, the front side was nice and flush and sticking with the magnet like it should...nice and flat,etc..BUT the rear side was VERY slightly raised. I could push it down about 1 or 2 mm with my hand and make it catch the magnet. I could not visually see anything causing this...SO, I took the guide off and litterally twisted it with my hands( sort of a reform thing). When I reinstalled it it seem to lie flat and catch magnets front and rear..Spent a lot of time chasing this. Now, no more dog ears or side 2 skews...

[msaeger]

Thanks for posting the fix !

[duct tape]

dog ears

I did'nt read all replies so I'm sorry if it's been posted already. I had an mp1100 with that problem, it ended up being the guidesin the duplex inverter section having paper cuts in the side of the guides, paper could hang up on them causing this problem. Just sand out the cuts ,you'll be good to go. Look carefully at all the guides side and ends.

[tomuntereiner]

Re: MP 1100 Dog Ears Calling All High Volume Experts

sometimes when the teflon wears on the hot roller, this can also cause dog earing. Fuser rebuild usual fixes dog earing for me

[Racer]

Re: MP 1100 Dog Ears Calling All High Volume Experts

KopyKat, Hi!

I am a long time Hi Volume tech on Ricoh products, but don't often vissit CopyTechNet...

Just wondering whether you sorted the problem on this thread.

Have you considered replacing the spur assemblies in the upper and lower guide plates. Alternatively remove them completely.

Your clicks at 6 million are relatively low. we have had machines well in excess of 30 million still doing fine. Must say we have had to replace the guide plates on some of our machunes... the upper one.

Will check back in a few days.

[Debs1964]

Re: MP 1100 Dog Ears Calling All High Volume Experts

KopyKat, Hi!

I am a long time Hi Volume tech on Ricoh products, but don't often vissit CopyTechNet...

Just wondering whether you sorted the problem on this thread.

Have you considered replacing the spur assemblies in the upper and lower guide plates. Alternatively remove them completely.

Your clicks at 6 million are relatively low. we have had machines well in excess of 30 million still doing fine. Must say we have had to replace the guide plates on some of our machunes... the upper one.

Will check back in a few days.

If it hasn't been fixed in 5 years I would imagine the customer is pretty pissed off by now

[Racer]

Re: MP 1100 Dog Ears Calling All High Volume Experts

If it hasn't been fixed in 5 years I would imagine the customer is pretty pissed off by now

Thank You... Thank You... "DEBS"

Darn it, i should have taken a closer look at the date, not to mention that you lot there in th EU run mostly Barons by now, whereas we still run plenty of Katanas and Bellini Pros.


On the chin I take it then!

[Debs1964]

Re: MP 1100 Dog Ears Calling All High Volume Experts

Welcome Racer, by the way, why don't you pop over to Newbie Check In and tell us a bit about yourself