Mpc7500 / 6000 low density possible cure!

[Shadow1]

...and the engineers who redesigned, then stuck with this monster should be flogged. I've been pushing my sales people to drop 2 MPC4000/MPC5000's or a C900/C720 into these accounts. EVERYONE especially the tech will be happier.

[johnnello]

Re: Mpc7500 / 6000 low density possible cure!

Ok here is the wrap up. I have visited both of my trial machines - which have both performed faultlessly (zero calls) for nearly 2 months. Both of these machines had serious issues and in one case the customer was demanding a new machine. To cut a long story short the mod seems to offer much improved reliability and stability of the devs. I opened up the colour devs and inspected the level of dev and unlike previously it was still where i would expect it to be, interestingly the only reason for this call was charge roller lines - the C/Q was still as strong as it was when I did the mod 63000 pages ago. This machine was going light in just 15k previous. The machine that has only the K dev modded has been transformed - from one that the cust wanted gone and call after call - to one that just had its first call in 2 months (once again cyan charge roller lines). The c/q was still exacly the same as the samples I took when I performed the mod.

We have performed this mod on approx ten machines now and there has not been one that has shown any negative effects.

So the conclusions I make are this 1; Ricoh has not got trickle feed development right in this model (not even close) 2; removing drive to the feed out auger significantly improved machine stability and reliability with no negative effects.

Go for it.

That's great news. Thanks for sharing with us!

[Gift]

Re: Mpc7500 / 6000 low density possible cure!

We also tried a test run with disabled Dev-disposal mechanism since we thought this would reduce the overall waste-toner amount (I think this machine does collect way more waste toner compared to the mid-range MPC series). After some time of monitoring I couldn't make out much of adifference between modded and unmodded machines - still a lot of waste toner collections and light density.

[Shadow1]

Re: Mpc7500 / 6000 low density possible cure!

Be careful with this mod - it worked great for my machines for 6 - 8 months until the humidity changed with the seasons, then I started having overfilled developers on about 50% of the machines I modded. The drive cam lever removed IS NOT AVAILABLE as an individual part - you have to replace the entire dev assy if you didn't save the levers. I was lucky, and only updated the machines exhibiting a problem, and only on the specific colors.

[Lagonda]

Re: Mpc7500 / 6000 low density possible cure!

Yep, agree with Shadow on that, one moment you think the modded units are going great, the next the dev units have locked up because they are stuffed full of dev that couldn't excape.
Also find that these boxes work reasonably well if the're used within their design parameters, keep below a 40% colour to B&W ratio and a reasonable toner coverage and they perform OK (just). Try to use them as a production machine and they will cause you major grief. (as if the salesman would not point this out when they get the customer to sign the disclosure document)

I've just heard through the grapevine that release of the MP C7501 replacement has been held back, anybody know anything more?

One of the more reliable sales managers has just told me the new box has been held back to May '13 while they redesign the whole engine, we live in hope!

[BLADE]

Re: Mpc7500 / 6000 low density possible cure!

Be careful with this mod - it worked great for my machines for 6 - 8 months until the humidity changed with the seasons, then I started having overfilled developers on about 50% of the machines I modded. The drive cam lever removed IS NOT AVAILABLE as an individual part - you have to replace the entire dev assy if you didn't save the levers. I was lucky, and only updated the machines exhibiting a problem, and only on the specific colors.

yep, file this mod under 'Bad Mods'

[BLADE]

Re: Mpc7500 / 6000 low density possible cure!

still a lot of waste toner collections and light density.

I think the amount of waste / density / dusting is all related. I,m guessing one part of process control is adding toner and another part is making sky shots on the belt to reduce toner during control, hence the waste. Of course I could be wrong. Could be fixed with firmware if not already done so

[johnnello]

Re: Mpc7500 / 6000 low density possible cure!

Be careful with this mod - it worked great for my machines for 6 - 8 months until the humidity changed with the seasons, then I started having overfilled developers on about 50% of the machines I modded. The drive cam lever removed IS NOT AVAILABLE as an individual part - you have to replace the entire dev assy if you didn't save the levers. I was lucky, and only updated the machines exhibiting a problem, and only on the specific colors.

Thank you for feed back, humidity will be a problem for us, I working in Ireland and here is humid all the time. I wonder this mod will solve toner scattering issues or are you aware for a mod to solve that, I did tried all Ricoh mods issued .
Thanks again!

[Shadow1]

Re: Mpc7500 / 6000 low density possible cure!

This did seem to help with the machine barfing toner all over its insides - once the developer gets depleted there's not enough to hold on to all the toner it tries to add to correct for low density images.

I don't work on these beasts anymore, but I had tried leaving the cam in place but clipping most of the coils off the overflow auger with a good strong (and I mean really strong) set of cutters. You have to seal up the waste channel near the rear and make the overflow work its way down from the middle or front side - seemed to be working pretty good, but i didn't work with it long enough to get a good test. I did post that mod, and I hope others have tried it. Maybe they can tell you if it worked or not.

[jaredfmn]

Re: Mpc7500 / 6000 low density possible cure!

Be careful with this mod - it worked great for my machines for 6 - 8 months until the humidity changed with the seasons, then I started having overfilled developers on about 50% of the machines I modded. The drive cam lever removed IS NOT AVAILABLE as an individual part - you have to replace the entire dev assy if you didn't save the levers. I was lucky, and only updated the machines exhibiting a problem, and only on the specific colors.

I have to agree.. I had 3 machines in the field lock up dev the dev units because they were so full. My recommendation is to not do this mod.

[turbojetboy]

Re: Mpc7500 / 6000 low density possible cure!

As the original poster of this thread, here are my thoughts. Got to give something a try with these beasts, the mod did give some temporary relief - however overfilling of devs is a problem. My advice is that removing the cam can cause overfilling and as such is not a fix for the low density issues. I have just attended one of the hundred or so 6501/7501 models that I now have to look after - waste bottle full 24708 bw total and 18929 Col total, cyan dev spilling ferociuosly and other devs all spilling - and other faults to boot. Looking back the 7500/6000 models are excellent machines that give very little trouble.

[Gift]

Re: Mpc7500 / 6000 low density possible cure!

waste bottle full 24708 bw total and 18929 Col total,

Imagine how much money went there directly to disposal The waste toner capacity for the midrange is brobably a third but it last easily for 200-300k prints.