MPC 5000 Fusing issue

[pfinn10]

Got this issue on some of the MPC 5000s i've got out in the field. Some customers are complaining of toner rubbing off the page when doing heavy colour bleeds.
The paper is just plain 80gsm
I've tried brand new fusers (whole units, not just a hot roller or pressure rollers), but the problem persists. I've tried bumping the temp up, but the problem remains.
Anyone have any ideas?

[rthonpm]

Re: MPC 5000 Fusing issue

Have you tried a heavier stock? I've seen better performance on a bunch of colour machines when the paper stock is somewhere in the 100-120 gsm (24-32# US) range, especially on higher saturation runs like that one.

[xordi69]

Re: MPC 5000 Fusing issue

oem toner?
fuser cleaning rollers changed?

[pfinn10]

Re: MPC 5000 Fusing issue

thanks for the replies.

I've tried thicker stock with pretty much the same results. doesn't do it all the time if i did a run of 20, only 3-4 of them would have the fusing issue.

Ive tried genuine and after market toner (put new pcu's/devs in for each try)

[xordi69]

Re: MPC 5000 Fusing issue

put temp as default, don't up it, and replace oil roller and cleaning roller in fuser
try with other paper
also cant modify sp 1-801-23-24-25-for fuser motor speed, but isn't the best solution
i think you have tried with diferent paper type (thick, etc...)
not oem toner makes this, have tried in monocolor?

[teebee1234]

Re: MPC 5000 Fusing issue

Generally, Ricoh devices will start printing slightly before the optimal temperature is reached (for first copy speed bragging rights). Try increasing the fuser idle time to allow the temperature to stabilize. The following cut/paste addresses low temperature environments, but the end result should be the same in your case.

[Symptom]
Cold offset, faulty fusing.


[Cause]
This problem is caused because the fall in fusing temperature is greater in a low-temperature environment.
[Resolution]

1. Increase the fusing idling time.
   
   By increasing the fusing idling time, the storage of heat can be ensured.
   
   SP1-103-018 (D027: 2 seconds to 12 seconds, D029: 10 seconds to 20 seconds.)
   
   

• If you are advised it is a low temperature environment (17 degrees C or less):
  
  SP1-103-016 (D027: 62 seconds to 72 seconds, D029: 70 seconds to 80 seconds.)
  
  

When the thermopile becomes dirty, there is the possibility of an offset. Therefore, check the thermopile for dirt and clean it at the same time.

[turbojetboy]

Re: MPC 5000 Fusing issue

put temp as default, don't up it, and replace oil roller and cleaning roller in fuser
try with other paper
also cant modify sp 1-801-23-24-25-for fuser motor speed, but isn't the best solution
i think you have tried with diferent paper type (thick, etc...)
not oem toner makes this, have tried in monocolor?

No oil rollers in this model. I would love an answer to this problem, I see it a lot and have tried all sorts of things (changing fuser temps does not help). I think it is affected by poor paper quality. Heavy toner coverage areas on the front and rear edge are the biggest problem for offsetting and then you have the problem of heavy coverage areas on the lead edge causing fuser wraps???

[BLADE]

Re: MPC 5000 Fusing issue

I been seeing this lately also on various models even with new parts.

[Bantams]

Re: MPC 5000 Fusing issue

I would try what TeeBee suggested and Update the Firmware if it hasnt been done already.

[MOSSY BOY]

Re: MPC 5000 Fusing issue

Just some things to try, and think about

Looks very like insufficient / uneven pressure.

Is it only happening at the rear or the front of the device.?

There is a motor that engages tha pressure roller positioning, driving a shaft with a cam that interupts a sensor.(Pressure roller contact sensor)

Doesthe device a history of SC 569 (Pressure roller contact sensor error) or any SC 5** 's? .

What about damp / cold paper ?

[df3036]

Re: MPC 5000 Fusing issue

Don't have the manual handy but is there a nip width test? Stop a solid copy in the fuser and measure the nip. Then compare to a know good machine...

[jonezy999]

Re: MPC 5000 Fusing issue

I have heaps of these in the field and we also run one in our print shop. At one stage it was our main machine too. From what I have tried, the only thing that makes them fuse heavy coverage is to tell the machine it has thick stock and use plain paper. Trouble is you will run into duplex and folding issues as the machine will not fold or duplex on a thick setting, (now that I think about it, we may have came up with a work around for those issues, I think either PS3 or PCL6 would allow the functions. One or the other.

[pfinn10]

Re: MPC 5000 Fusing issue

thanks for the suggestions.

i've tried doing the settings teebee suggested, after changing those SP settings, and giving the thermopile a good cleaning. i've tried it on some of my problem machines and so far they have stopped giving issue.

so at present i'll say its working, if it fails now at least its steps in the right direction