Mpc7500 / 6000 low density possible cure!

**Jomama46** · 11-02-2009

Trickle feed developer? Is the toner partially developer?

**Lagonda** · 11-02-2009

Originally Posted by Jomama46

Trickle feed developer? Is the toner partially developer?

Yup, 10% of each toner is developer. The theory is that as its continually renewing the dev the copy density remains even. Well that was the theory!

**Vulkor** · 11-07-2009

Any News on this??

**turbojetboy** · 11-07-2009

I will be writing up a full report soon, however I can tell you that I have been watching these machines (the 2 moded ones) and neither of them have had any problem or call since! I also know that both of them have completed over 40k each. I will wait at least a month and then open up devs and have a look etc. I can tell you that quite a few of our other techs have performed this mod and we have seen no problems at all!! I am not going to say this is 100% cure BUT it does seem to work and has no drawbacks and is very easy to implment. Stay tuned.

**tcs04** · 11-08-2009

TOP MAN!!

Will be trying this on the 2 machines giving me trouble as soon as I can get to them!!

Incidently, One thing that does cause all Ricoh colour machines to run slightly grey on B+W copies is the default original type setting of "text / photo" mode. changing this to "text" and locking as default will also give a 5% -ish increase in full black solids.

**turbojetboy** · 11-17-2009

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.

**Jomama46** · 11-18-2009

This is really good info. Thanks for the feedback.

**stephend** · 11-18-2009

Thanks for the feedback. I will apply to mod on one machine next week so I will post feedback.

**TonerMunkeh** · 11-18-2009

Originally Posted by turbojetboy

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.

Do us a favour and report this to Ricoh's tech support. They might issue an RTB with this information on.