MPC 6500 7500 Blowing toner

[anothertech]

Re: MPC 6500 7500 Blowing toner

My customer is getting a humidifier for one of these in a dry location. Humidity is 15-20% now, whats a good humidity number to shoot for?

[Shadow1]

Re: MPC 6500 7500 Blowing toner

My customer is getting a humidifier for one of these in a dry location. Humidity is 15-20% now, whats a good humidity number to shoot for?

Human comfort level is around 40-50%. Check the specs on the machine - They usually say operating range is 40-70% an add another 10 points on either side for non-operating storage, but don't quote me - I don't have the manual in front of me.

[BLADE]

Re: MPC 6500 7500 Blowing toner

I read a thread on the konica forum a while ago, seems theres a line of machines that behave in a similar fashion and their solution was the mag role pole position which would be easy to play with if anyone wants to try that.

Some of the Tag words at the bottom of this page are interesting, heaps of them too

[Besserwisser]

Re: MPC 6500 7500 Blowing toner

drum unit assembly and dev unit assembly has bad design............u can't do anything with dis machine just keep on cleaning all the time...........

I agree. There is no solution. These bastards have given me grey hairs. Ive tried everything but they just puke out toner. So far Ricoh doesent give a shit about this pieces of crap. Have had this problems 5 years and so far no support..they say that there will be a replacer this spring but the damage is already done.

[Wishbone]

Re: MPC 6500 7500 Blowing toner

Hi ho hi ho these copiers suck and blow!

[incognegro]

Re: MPC 6500 7500 Blowing toner

I've had these machines down here in Florida for years and I've fixed them all when they come from the factory all screwed up.

The problems are many.

The first issue is the way the developer was installed originally (if you had to install developer yourself, the service manual tells you to do it wrong), you have to install developers one bottle at a time and then run 3814-xxx for that color and then 3811-xxx for that color. Note that you have to put the toner hopper back on the machine for each developer setup.

If you're doing your first PM or if it's already dusting, you will have to repair the drum cleaning station (chances are, if your machine is new, then you won't have to worry this) because the mylar in the drum cleaning unit gets in the way of the augers that pull excess toner off the drum and shuttles it out of the pcu and down in the used toner tubes. The mylars get shifter because they are sometimes installed improperly at the factory and the techs don't know how to do it in the field.

I will have to get some pictures and post them here for you all to see.

I will be back.

[slot]

Re: MPC 6500 7500 Blowing toner

any up date on the pics as im intrested too see them thx

[Smee]

Re: MPC 6500 7500 Blowing toner

I wanna see the pics too - sounds very interesting, a possible fix for one of the most horrible machines....

[CableGuy]

Re: MPC 6500 7500 Blowing toner

Had a RTB about this come through a few weeks ago, 6 pages of things to do and adjust to reduce this problem.

[tjvincent]

Re: MPC 6500 7500 Blowing toner

Can you post those or send to my e-mail ? I am trying to do anything I can to get these machines so we can at least break even on them.
We refer to these as our loss leaders.

[teebee1234]

Re: MPC 6500 7500 Blowing toner

Can you post those or send to my e-mail ? I am trying to do anything I can to get these machines so we can at least break even on them.
We refer to these as our loss leaders.

I posted these links last week on another thread. You can download the powerpoint and video from here.

http://www.4shared.com/video/Yb2cEuPt/Venus_Dusting-L.html

http://www.4shared.com/file/AEJAWtpi/Gators_Tech_Tips_Dealer.html

[Timmytronic]

Re: MPC 6500 7500 Blowing toner

Looking at the developer assy from the front, the auger that transports overflow developer is at the top left - the lever and one way bearing is attached to the front of the auger - it rides on a pin attached to one of the mixers - something like a cam so the auger gets flicked about 1/8 turn ever rotation of the mixer.

Think twice about removing this though - I've had the units run much better for about 5 months, then start packing full when the season and humidity changed again. That's what I was afraid would happen when i was first told of this fix, and was surprised that just vibration seemed to be enough to transport the waste developer. Turns out it isn't always enough.

The lever is not available as a part, and the entire dev unit has to be ordered when this happens.

Before I got moved to a different segment of machines I started testing an alternate solution. Fortunately the auger has a center shaft, so it is possible to cut some of the coils away near the drive end and modify the passages that allow overflow to spill only on the cutaway part. This still provides positive transport of overflow, but makes it work harder to get out.

A stock coil looks something like this:

==+XXXXXXXXXXXXXXXXXXXXXXXXX>

A modified coil would look more like:

==+--------------------------xxxxxxxx>

Again the only "Open" passage for overflow developer should be near the front of the machine around the cutaway part of the auger. That means only the center shaft is flicking the toner around and making it work its way to the exit - should slow the process down considerably, but not bind it up completely, which is what we want.

I didn't get too much chance to experiment with this solution, so no guarantees, but we gotta try something with these pigs and the engineers won't even acknowledge there's a problem.

Hi Shadow1

Did you ever get thios sorted by cuting away some of the Auger coils away? I took the cam off but it fills up after about 20k so really not the way forward but kept the old cams so fitting them back when I get a problem. The cutting of the auger is a more permanent fix, before I do it was hoping on an update.

Has anyone else had any more luck with the toner blowing. I can re dev a machine and its fine for 20k then all goes wrong again. Always made sure parts are PM'ed as well

Many thanks for your time people.

Tim

[Shadow1]

Re: MPC 6500 7500 Blowing toner

Fortunately changed territories before I could play with this too much, and I still don't have any of those daemon bastard machines in my territory. I've talked to other techs who have tried it, and they've said it works about as well as putting tape over the slots opening onto the overflow auger. Bottom line is that nothing really brings these machines to what they should be.

[Timmytronic]

Re: MPC 6500 7500 Blowing toner

Ahhh Gotcha

That will still make it all backup I think eventually. They are suppose to bringing out a new one MPC6502/7502 so you never know they may of crackedit somehow. I total re design is needed. I just cant see how they made such a mess of it. The 5560 previous model, had issues but this was not it and now suddenly they invent a problem. Thanks for your feed baxk and if you get any solid advice from a tech its always welcome.

Have a good day

Tim

[Shadow1]

Re: MPC 6500 7500 Blowing toner

Had a tech go to training on the replacement machines pre-release - he said they're built like a tin can, even harder to work on, and have several inherent design flaws. They might be ok in light duty environments, especially if you don't have to vac them out every 10k, but he's not convinced they're an improvement yet.