Suggestions needed for Nashuatec MP 7500

[Guest]

Hello.

This is my first post here.

I have a problem with a Nashuatec MP 7500 copier. It's fairly new but it outputs pages quite dirty as if toner was sprinkled. Sometimes there are toner streaks as tyres marks. The fuser was replaced three times to no avail. A small (I think metallic) roller that sits below a big rubber roller in the fuser part was replaced too (to no avail too). I am not a technician so maybe it's hard to understand me. The copier keeps outputting dirty pages. I don't recall number of copies now but it must be around 20000-50000 (not sure). Our technician said fuser temperature was set almost at the lowest value (whatever it may be). Will it make any difference in rising the fuser temperature? What are recommended values? Thank you very much in advance.

[totoro]

Re: Suggestions needed for Nashuatec MP 7500

Are you using OEM supplies? Fusers don't usually cause spots; lines yes , but 3 fusers for a machine with 20-50k. Is your Tech a trained Ricoh\Nashuatec Tech? You say it's new. Is it new or a certified series? I would have your Tech pull out and look at and clean the Drum unit, Drum cleaning blade, and Developer Ass.

[eL_PuSHeR]

Re: Suggestions needed for Nashuatec MP 7500

Thank you for your reply.

The copier is second-hand but it's fairly new. Surprisingly enough I have another two copiers a lot older and they are working fine. We will check those parts you mention possibly today.

[daveyball]

Re: Suggestions needed for Nashuatec MP 7500

Hello.

This is my first post here.

I have a problem with a Nashuatec MP 7500 copier. It's fairly new but it outputs pages quite dirty as if toner was sprinkled. Sometimes there are toner streaks as tyres marks. The fuser was replaced three times to no avail. A small (I think metallic) roller that sits below a big rubber roller in the fuser part was replaced too (to no avail too). I am not a technician so maybe it's hard to understand me. The copier keeps outputting dirty pages. I don't recall number of copies now but it must be around 20000-50000 (not sure). Our technician said fuser temperature was set almost at the lowest value (whatever it may be). Will it make any difference in rising the fuser temperature? What are recommended values? Thank you very much in advance.

MP7500 get someone who knows what they are doing on one of these, they run brilliantly, as long as they are serviced correctly.

[Ollie1981]

Re: Suggestions needed for Nashuatec MP 7500

It's quite unusual for these for run with dirty copies, as a previous responder correctly stated, worn fuser parts generally give lines down the feed direction of the copy. If the fuser roller is worn in this way you can usually quite clearly see it by pulling out the "D" drawer, lifting up the jam removal gate and looking at the hot roller.

Smaller machines in the Ricoh B/W range in my experience have given dirty copies from worn fuser rollers, but it's less common with this machine as it has an oil web that both cleans and lubricates the hot roller as the machine is running.

Now.....if the toner you are running is not Ricoh/Gestetner/Nashuatec/Rex Rotary/Lanier or Infotec branded, it's likely to be non-OEM. This could be the cause of your problems.

If you are getting what we refer to as "background" (essentially what should be white paper is actually a mottled grey inside the print margins) then it's likely to be a worn drum and/or charge corona unit.

If you are actually getting toner scattering then I'd be looking around the drum cleaning area, have on a couple of occasions had the toner recycle coil break in the PCU (the larger one that runs behind the cleaning brush) usually due to the diagonal coil on the front of the PCU getting completely clogged and/or it's drive gears getting chewed. If the technician vacuums out the toner, the machine will run ok for an indeterminate period (as the blade and brush will remove toner from the drum to the cleaning unit) but if the coil is actually broken then that toner stays in the cleaning unit until it overflows back onto your copies.

[mikadonovan]

Re: Suggestions needed for Nashuatec MP 7500

It does sound like a problem in the drum unit. If the drum is worn out, or the developer is past life it will build up toner in the pcu and drop it onto the paper.

[eL_PuSHeR]

Re: Suggestions needed for Nashuatec MP 7500

Small update:

We have made some adjustments to fuser temperature (from 180 Celsius degrees to 200) and also adjusted the oil web thing to do more cleaning passes. We are pretty sure the drum unit is okay as well as the developer. Now, we have to test it for some days. So far, so good. Printed about 500 copies with no stains. We aren't using OEM toner so we must take that into account too.

[Eric1968]

Re: Suggestions needed for Nashuatec MP 7500

Adjusting the fuser temp and web cleaning will never help to reduce dirty copies. Like Ollie says, it must be something in the drum/development unit. And always use original toner in this machine.

[Ollie1981]

Re: Suggestions needed for Nashuatec MP 7500

Small update:

We have made some adjustments to fuser temperature (from 180 Celsius degrees to 200) and also adjusted the oil web thing to do more cleaning passes. We are pretty sure the drum unit is okay as well as the developer. Now, we have to test it for some days. So far, so good. Printed about 500 copies with no stains. We aren't using OEM toner so we must take that into account too.

I would wager a good amount of my own cash that your problem is down to the non-OEM toner.

All machines I attend in this range are run on OEM toner and apart from the hot roller (which can crap out early usually worn down to the metal where the thermistors in particular contact the roller, IMO they should have stuck with the thicker roller from the 1075 they lasted forever ... well ....after they modified it from the "soft" type roller which was crap) practically all drum/development parts reach PM life with no great issues.

I have no experience of running these machines on non-OEM toner so I can't really offer any advice about how to get better results. From what I've heard it's often a false economy as although the toner is cheaper by the bottle, it tends to cause other problems.

Don't expect any help from Ricoh/Nashuatec support either, like most manufacturers they are pretty unsympathetic about problems caused by non-OEM supplies.

[eL_PuSHeR]

Re: Suggestions needed for Nashuatec MP 7500

You are right. We are going to use OEM toner if issues persist.

[eL_PuSHeR]

Re: Suggestions needed for Nashuatec MP 7500

I forgot to update the thread.

The issues were solved by increasing fuser temperature from 190 Celsius degrees to 200 (we are using non OEM toner).

[Eric1968]

Re: Suggestions needed for Nashuatec MP 7500

If you're not using the original toner on this machine, I'm sure the problems will come back.

[kingpd@businessprints.net]

Re: Suggestions needed for Nashuatec MP 7500

Sorry friend but you're not very logical or rational. Everybody who is a technician and now including myself said to NOT use generic toner and you still don't seem to get it that the crap toner is the cause of the problems.

And I really don't understand why you'll go through the money and expense and the headache to replace the fusing unit 3 or 4 times but you won't spring for OEM toner! There's tons of places to get it so I'm sure you could shop around.

Not having to waste your time on quality issues would be reason enough for me. Remember, even if your copies come out fine, that doesn't mean that your machine will run at an optimum level and prematurely have more problems.

Have fun though. And in case you still didn't get the message: Use OEM toner on all these commercial grade machines...it's worth it.