Ricoh mp 7502 overtoning - light image

[Phil B.]

Re: Ricoh mp 7502 overtoning - light image

are there any settings in sp mode that i can do??

in another mp 7500 with long runs and 70000+ pages per month there is no problem like that.

BUT how many total pages on the 2nd unit...
Media?
Coverage?

Same location?
Better environment?

Sent from my SM-G960U using Tapatalk

[slimslob]

Re: Ricoh mp 7502 overtoning - light image

are there any settings in sp mode that i can do??

in another mp 7500 with long runs and 70000+ pages per month there is no problem like that.

MP 7500 is an older model from when they did not have to be RoHS, Reduction of Hazardous Substance, compliant. Machine 75ppm machines back then were intended for the an average of 50k and since it was the fastest in the model could handle a maximum of 150k. With the 02s they introduced the MP 9002 90ppm model. The 9002 added a production type developer pressure release system. You could refer to the parts catalog and order the parts needed to add the pressure release system which should relieve the toner gassing out from the development unit.

[KeviM]

Re: Ricoh mp 7502 overtoning - light image

Hi

I agree with Slimslob. He seems to be on the right track. Even the advice that the other techs gave is good. Please try that first.

If you still believe that those suggestions are not going to work then maybe you can try these. You are towards the "SHOT IN THE DARK" area of repairs NOW. You'll have to try and see if these work.

1) power packs (high voltage boards) change all and test. Make sure to set correct voltages as they may have been changed by processing
2) BCU board. This board and the power parks have a possibility of getting damaged due to power surges, lightning strikes,.. Etc.
3) Have you tried stopping the machine mid-cycle? Then checking your drums image? This might give a better idea of what is going on

Hope this helps friend. Please try the other suggestions first.

Please let us know how it goes.

All the best friend

[luca72]

Re: Ricoh mp 7502 overtoning - light image

Hello to everyone!
I bought and sell a used RICOH MP 7502 last month ( counter 890.000 copies) .
I changed all PM (drum,developer, tranfer belt,brush, grid ,blades seals etc..) all OEM.
I did initialization settings as always 2-801, 2-962 .The print quality after a few thousand prints ( 5000 - 7000 pages !!)
has become light and in Drum stay entrance there is too much toner.
I changed developer again and the problem continues...
Auto Process Control is ON ( SC History was once SC380-41)
Dev.bias: 515 V
Toner supply mode:2-208 is 0 (sensor control) is default
Toner supply rate: 2-209 is default
Vref nanual setting: 1.02 (default is 2.5)
Vt display: 0.6
any ideas???please help!!
Thanks!

changing all that stuff, I take it for granted that you also cleaned everything (?) ... so I would suggest you after running the bulletin procedures, to turn on the heaters, which help a lot, even the ozone filter, if too old it plays tricks strange, especially if the mc works in tight spaces. same problem happened to me with 2 packs of old or bad developer, I never understood this exactly, but it was there for a long time

[doro]

Re: Ricoh mp 7502 overtoning - light image

hello guys,
i think that i found the problem.
the problem propably is the toner supply clutch in the development motor assy.
I checked today output table 5-804-52 (Toner Supply CL) and no ''click'' responce in on/off ...
the clutch stays on and no off.

[anothertech]

Re: Ricoh mp 7502 overtoning - light image

hello guys,
i think that i found the problem.
the problem propably is the toner supply clutch in the development motor assy.
I checked today output table 5-804-52 (Toner Supply CL) and no ''click'' responce in on/off ...
the clutch stays on and no off.

It could be the board that controls the clutch. Can you get on the wires with your meter?

[tsbservice]

Re: Ricoh mp 7502 overtoning - light image

hello guys,
i think that i found the problem.
the problem propably is the toner supply clutch in the development motor assy.
I checked today output table 5-804-52 (Toner Supply CL) and no ''click'' responce in on/off ...
the clutch stays on and no off.

Remove any remainings of sticky foam(noise dampening pads) from there they tend to melt down mixed with dirt and toner. Just scrub them and clean with IPA then use 2-3 plies of isolation band for example.

[apump]

Re: Ricoh mp 7502 overtoning - light image

Maybe if apump had referenced the bulletin you posted his recommendation may have made sense.

just because it wants to refrence serial number doesnot mean a dev unit can go bad. really!!

[slimslob]

Re: Ricoh mp 7502 overtoning - light image

just because it wants to refrence serial number doesnot mean a dev unit can go bad. really!!

From the Aficio 551 on I have had exactly 1 development unit go bad. And that actually was not the DVU but was the clutch doro mentioned. Pumped a toner bottle dry in less that 24 hrs. And that was an Aficio 551 with over 1 million copies on it. Some people like to replace them when they start pumping developer out the rear bearings but those are replaceable as is everything else on those tanks.

[BLADE]

Re: Ricoh mp 7502 overtoning - light image

it might be a dud, ( 01s there were some duds lol)