Bad quality in Ricoh MP7500

[espastech]

Hello to everybody

I have a Ricoh MP7500 that I use to print some works in black toner (obviously, which color else?, haha) and I need a high density of black toner, I mean a "dark powerful" black, not a grey black.

Im having problems to get it because the copies gets lighter every 200 copies. I can force toner supply with the SP button, but I cant do that every 200 copies, it is against all the productivity.

I replaced the developer, initialized the TD sensor with SP 2801 and clicked SP2962 for the automatic adjustment of drum. It didnt work

I tried to increase the value of the development bias from 550 to 600-620 and changed the SP 2209 Toner Supply Rate to 50, because the lower is that value, the more toner it supplies. It didnt work neither.

Any suggestion? I dont know what else I can do.
Thanks

[CRISTIAN MULLER]

Re: Bad quality in Ricoh MP7500

You had to increase the amount of toner suply, i think there is aoption in service mode, like toner suply rate or something, i will look for the exactly option

[Iowatech]

Re: Bad quality in Ricoh MP7500

That's a pretty large machine, how many total pages per month are you running? Best I can tell, if you aren't running at least 50K pages per month the toner feed system isn't able to keep up, and you will get light prints because of that.
If you are not running at least 50K pages per month, CRISTIAN MULLER was right (so give them the credit for what follows), you will need to at least adjust the toner feed rate. SP2209 is what you will want to adjust, and reducing the value increases the time the toner feed system stays engaged. Depending on how many actual pages you run through that machine per month, that might be only somewhat successful.

[PinevskiS]

Re: Bad quality in Ricoh MP7500

Check developer unit,on back site have big black gear maybe in the middle is broken and don't mix a developer.

[slimslob]

Re: Bad quality in Ricoh MP7500

ID sensor patterns are used to maintain image density. After an ID sensor pattern the machine will increase or decrease Vref used for toner density. SP 2201-002 and 004 can be used to increase or decrease the density of the patterns. Decreasing by up to 50 may help make the black print denser. Increasing too much can cause over toning and background.

From the service manual:
SP 2210 ID Sensor Pattern Interval

Adjusts the time interval between making ID sensor patterns onto the drum for
Vsp/Vsg detection.
[-~200/1]
Reduce the interval for copies that contain a high proportion of black.

I know that with other models this is the frequency in terms of jobs that a sensor pattern is done. Default is normally 10. For machines averaging 100 or more pages per job, I usually set this to 1.

If you are doing even large page per job runs, use SP 2507 to have patterns run during jobs.

In order for ID sensor patterns to be most effective, the sensor must be kept clean. Clean only with a soft cloth dampened with water only. Anything else can either leave a film or etch the sensor surface. sing a dry cloth can cause static which will attract toner and possibly damage the sensor. Proper PMs are essential to keeping the sensor clean. If you have problems with toner dropping on the sensor between PMs, replace the cleaning brush.

[espastech]

Re: Bad quality in Ricoh MP7500

Hi Slimslob

I tried your advices and they didnt work either.

I guess that the machine is asking for a retirement, because I changed again the developer some weeks ago, initialized everything again without results. I actually have other machines that give me better quality and less problems, so maybe it is time to retire it.

Thanks for your help anyway

[Cipher]

Re: Bad quality in Ricoh MP7500

It's worth checking the drum shaft continually out.
I normally apply a small dab of conductive grease to the copper contact points in the housing.
But it normally helps a lot with light / faded copies.

It's a bit of a mission to get the drum shaft and housing out, but we are technicians so...

[davel]

Re: Bad quality in Ricoh MP7500

Stop fiddling with SP modes, set all back to standard, do full PM including parts then see if quality still drops.

[slimslob]

Re: Bad quality in Ricoh MP7500

It's worth checking the drum shaft continually out.
I normally apply a small dab of conductive grease to the copper contact points in the housing.
But it normally helps a lot with light / faded copies.

It's a bit of a mission to get the drum shaft and housing out, but we are technicians so...

Bad drum ground normally will cause background not light print.

[slimslob]

Re: Bad quality in Ricoh MP7500

Does this machine spend a lot of time not being used? If so you are never going to maintain good copy quality.

[Cipher]

Re: Bad quality in Ricoh MP7500

Bad drum ground normally will cause background not light print.

I've only applied that fix to 20 or so Martini's over the years, guess I was just lucky each time ah.

[bat]

Re: Bad quality in Ricoh MP7500

Stop fiddling with SP modes, set all back to standard, do full PM including parts then see if quality still drops.

I agree...

[Lagonda]

Re: Bad quality in Ricoh MP7500

I'd go back to basics before fiddling with SP's. How many prints has this done?? First up I'd be giving it a new toner feed clutch and if its over 1000k its time to give it a new dev and toner unit.

[BLADE]

Re: Bad quality in Ricoh MP7500

I feel your pain, 23,000 parts arranged to spit out something that looks ok, when it doesn't happen theres not an error or a clue

[sturmtrooper]

Re: Bad quality in Ricoh MP7500

Does this machine spend a lot of time not being used? If so you are never going to maintain good copy quality.

We have a ricoh customer with a MP6002 that did like 22k over the span of two months. They've had it for two years and it has less than half a million on it. Then they bitch about poor copy quality Q_Q