Mpc7500 / 6000 low density possible cure!

[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.

[Jomama46]

This is really good info. Thanks for the feedback.

[stephend]

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

[TonerMunkeh]

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.

[Jomama46]

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

haha, you're kidding, right?

[Shadow1]

Go ahead and report it - I doubt they have even acknowledged there is a problem, but give them the benefit of the doubt. Ricoh will get their collective $h|+ together eventually, just not sure if it will be before or after they start losing market share.

On a related note, I saw somewhere the engineers believe the MP4000 coated mag roller PCQ problems affect something like 0.7% of the units in the field. We have a serious failure in communication. It may take us filling out a field problem report on EVERY serial number for EVERY machine EACH TIME we have to go deal with persistent problems like this, and including successful field fixes in the info wouldn't be a bad idea either. Might be a big enough slap in the face to make them fix it.

If us knuckle drag'in vacuum jockeys can figure this out, why can't the Einsteins in engineering?

[spaceman99]

Fantastic.... carried out this mod with good results. Thank you very much for the info Turbojetboy.

[Smeden]

[Jomama46]

Nothing is impossible for them who should not do it

Heavy, Man. I had to read it multi-times to get it, but this is a truism.

[turbojetboy]

Tech support (australia) has been given all the info and also links to this page. First up I want to say I am happy with my job at Ricoh and have found them to be a good company to work for as compared to others that I have had employment with....HOWEVER I have been very proactive with all sorts of ideas like this one and have forwded on to relevent managers these ideas - and NOT ONCE have i ever even received a reply or had the idea taken further........SO dont hold your breath, I guarentee you they wont like this idea (it makes them look stupid) and nothing will be done about it. And by the way I have worked on various Xerox models including DC1250 and DCC400 Imari's etc - this is why I can talk with confidence about "trickle feed development" - something that X has been doing for a decade and doing very well....trust me.

[Wishbone]

Is there a similiar fix for the 3260?

[hurloch]

thanks for the tip and the continued follow up. Personally have not had much issue with this but have a couple of co-workers fighting it. Greatly appreciate everyone posting their ideas and tips and hope someday to have one to offer.

[Shadow1]

Don't celebrate quite yet - Check the other threads related to this - Removing the overflow developer drive cams works great as long as the humidity stays the same, but once the seasons changed I started having problems with the units overflowing and locking up.

I've experimented by clipping most of the coils off the overflow auger and then moving the tapes on the overflow channel to open the "vents" at different areas so that the developer just can't spill into the auger - it has to work its way out a little harder, but the overflow auger drive is left intact to help it along. Bottom line - this is a failed design from the factory, field mods help but Ricoh should have corrected this problem a long time ago, except the MPC7501 is no different.

[jettamand]

I have done this local, with good result :

change sp 3-501-003 from 1 to 2 (mc will now made desity adj after each job end)
change sp 3-551-001 to half value (B/W process controll interval)
Change sp 3-551-002 to half value (color process controll interval)

[turbojetboy]

Don't celebrate quite yet - Check the other threads related to this - Removing the overflow developer drive cams works great as long as the humidity stays the same, but once the seasons changed I started having problems with the units overflowing and locking up.

I've experimented by clipping most of the coils off the overflow auger and then moving the tapes on the overflow channel to open the "vents" at different areas so that the developer just can't spill into the auger - it has to work its way out a little harder, but the overflow auger drive is left intact to help it along. Bottom line - this is a failed design from the factory, field mods help but Ricoh should have corrected this problem a long time ago, except the MPC7501 is no different.

I work on this whole range endlessly, and unfortunately the 6501, 7501 are no better at all, in fact they seem to spew toner out everywhere inside the cavity worse than I have ever seen. Same duplex problems and same charge roller issues. This engine should be finished off.