MPC 6500 7500 Blowing toner

[Shadow1]

Anyway I'm glad to see I'm not the only one frustrated with these units.

Actually, I kinda wish I was the only on frustrated with these - that would mean I was doing something wrong, and a quick "please tell me I'm stupid" post on CopyTechNet would solve that real quick...

.To replace the toner supply units will make sens if will be only one machine with this problem...but everybody is complaining about same thing....so all the toner supply units are defective???? ... <snip> ...The only improvement that make sens is to take out the cam that is moving the overflow auger...

There's no way toner pumps have anything to do with this unless the clutch is sticking, but they do fail (false out of toner is the usual symptom), and on a FYI side note the pumps are the source of fireflies these machines are so famous for. Check the bulletins for the C900 - Specifically G178/D016 - 033. When the toner runs dry the machine tries a little too hard to pump more out of the bottle/bag, running those type pumps dry creates a lot of friction, which melts the toner into those tiny little dots we usually see in the middle of the firefly. Corrective action on these beasts is essentially the same as for the C900, although I basically set my machines for "do not retry - ever." I've seen this exactly on failed pumps - melted plug of toner on the one I was brave enough to take apart.

Taking out the cam lever fixes the light copies -*IF*- you get the stupid thing to initialize properly at Dev setup. I think removing, or more likely stretching, the spring on the lube bar will help with the charge roller lines. Ricoh was right about that part - the lines are from built up lube. It would be a lot better if they would change the charge roller to something proven to work, and take that stupid fragile wussy foam cleaning roller off and replace it with something a little more substantial.

[msaeger]

It would have been better if they just used 4 corons. I never have a problem with the black.

And the MPC7501 still has the charge rollers.

[Shadow1]

Ricoh obviously recognizes coronas are better because the C900 uses them for all 4 colors. The problem is with all the extra ozone they generate - if you ever operate a C900 with the controller box pulled away its like dry cleaning your lungs, and you'll have to spend the rest of the day outside to get your tan back. Not that its a real problem, the ozone filters work fine if you change them on PM.
Charge rollers aren't that bad either you just have to keep them clean - just like you have to keep a corona clean - and the cleaning roller in these things falls apart if you look at it wrong, how can it possibly stand up to all the lube they're throwing at it.
Bottom line - There's a real lack of testing before they release a product these days. The engineers really need to get their ass in the field and work on some of the junk they design.

[stephend]

Originally Posted by Shadow1"Charge rollers aren't that bad either you just have to keep them clean - just like you have to keep a corona clean - and the cleaning roller in these things falls apart if you look at it wrong, how can it possibly stand up to all the lube they're throwing at it.

Bottom line - There's a real lack of testing before they release a product these days. The engineers really need to get their ass in the field and work on some of the junk they design ."[/QUOTE]


No problem to keep them clean from the technical point of view...but impossible to do it without pissing off you customers... Where I am during winter I'm lucky if I'll find an account with 10%RH at the PCU level....The majority of my account are at 5%...and cleaning the charge rollers just makes the situation more tense . People bought these machines for R&D Dept for micro production of for production (depending how desperate was the sales person).

Agree with you about toner supply clutches...but it's impossible that all the units to have this problem since day 1....All C and M units start dumping since day 1 at least here where we are blessed with low RH for all 9 months of winter Faded K at 15.000 and dumping units on brand new machines are the most common symptoms.

Looking at MPC 6501 and 7501...they did something...but in totally different areas than I expected. Improved fuser (great), improved materials in inverter (good) improved materials in duplex (OK), improved laser unit...ticker paper from tray 3 (I really didn't want to see this)...improved ADF (faster and better). NOTHING in the toner supply area, PCU units area. The thing that they don't mention but is modified is the developer...now different...So technologically was cheaper to develop a different powder hopping to fix (same with BW 4000/5000 models) all the problems....Time will see but I think it will be another looser...especially because this new model is advertised more aggressively as a production unit (new accessories like ring binder...scares the hell out of me...where this machines will end...

[salesux]

It appears firmware has been released to address this issue. Guess I'll try it out on a machine and see if it helps.

[msaeger]

The MPC6501/7501 has different numbers for toner, developer, and charge rollers.

[Shadow1]

That TB description doesn't jibe with the nearly empty developer units I've been seeing on units having this problem

[tjvincent]

Shadow1, what do you mean by the nearly empty Dev units ? Is the developer gone ? Have you tried removing the one way gear on the front side of the Dev unit that augers out excess Dev ?

[Shadow1]

If you pop the filter and look, the dev unit is way less than half full, and badly overtoned. Yes, I've been removing the cam lever - I posted that as a solution back at the beginning of this thread. It seems to completely fix the toner puking, but nothing I've found so far fixes the charge roller lines.

Ricoh is correct in that the lines are built up lube, but they have no solution to fix it. I tried removing the springs on the lube bar to reduce the amount blasted around in there, but my test machine was returned before I got any results. I suspect removing the springs was an overcorrection and will trash the drums, but I had to start somewhere - likely just need to stretch a coil or so on the springs

[anothertech]

How about applying liquid wax to the charge rollers? I waxed one a few days ago, thinking maybe the lube won't build up on it.

[Shadow1]

Interesting.

Wouldn't be the first problem resolved by wax, Brillianize, or RainX

Anxiously awaiting results.

[stephend]

car wax, based on carnauba wax? Why you don't try the new D081 charge rollers? They should be improved.
I know Ricoh said thet the dev is not compatible with D014 but I don't see why the charge rollers won't be.

[msaeger]

Did you pull one off and see what they improved ? Just curious I haven't had one yet.

[anothertech]

The product I use is called "Nu Finish" it works good on a lot of things. I've used it on drums plenty of times.

[mabawser]

Just had an e-mail to let us know that there is a new fimware to fix this fault on these machines...

CAUSE:
Development ability of toner decreases, when the machine is used under low temperature (around 68 degrees F / 20 degrees centigrade) and low humidity (around 10%). Under this condition, machine tries to keep the ID (image density) on the printed image on paper constant by following two functions as a set.

Function#1:
Change the pointer table number for drum potential control higher.

Function#2:
Increasing the toner amount inside the developer by providing much toner to the development unit.

Currently, the pointer table has an upper limit (Pointer table Number 26). Therefore, the Function#1 may not be effective under low temperature and low humidity condition. Therefore, machine tries to perform Function#2 mainly. By this function, the ID (image density) on the printed image is kept constant, but the toner may scatter inside the machine as its side effects.

To Top

ACTION:
Upgrade the engine firmware to the following custom-built version.

Engine D0145402K_LR0428.fwu Ver.1.51b:01

NOTE: This custom-build engine firmware increases the upper limit of pointer table from Number 26 to Number 30 in the Function#1. By this change, the effectiveness of Function#1 increases to keep the ID on printed image constant. This leads to reducing the Function#2.


IMPORTANT
Never apply this custom-built engine firmware to the machine without toner scattering inside the machine. If you apply it to the machine without toner scattering, the following side effect will appear.

•
Low ID (image density) on printed image on paper.

•
Firefly symptom on halftone area.

FIRMWARE UPDATE REQUIREMENTS
This custom-built engine firmware also has the combination with other firmware mentioned in 108890. Please refer also to 108890 more in detail