mpc7500 - sc411 - GREY HAIRS

[Polarbear]

Good day all.

they new year has a twist in it!

I have an MPC7500 that was working fine till the end of last year. The customer went on leave for 3 weeks and when they returned the machine will do the following:

From cold start all is fine. It will process and start printing Fiery jobs until the first process control mid job. The machine starts process control, then stops and says there was a functional problem and it needs to restart.

After the restart, if i check the sc logs i get 411. Also the process control self check results are 99569999 (56 being low Magenta density)

The magic book as well as goose's guide say the following - which i have done:

Check laser shield glass
Check id sensors

I also followed the procedure in the manual that asks that one prints sp2109002 #12 and then turn off sp2109005008 to 0 and then reprint the test pattern. What bothers me is if i do this, i get a blank A3 sheet after having turned off the settings on 008.

What i cannot understand about the test above is that this only tests the black pcu as there is nowhere to test the other colours.

My main concern is the 411 though.

The machine has said that the magenta toner is almost empty, but checking the bag shows about enough toner, up to where the bag starts to narrow into the "y" shape.

As a precaution I replaced the magenta toner supply, as when i checked it, there was no toner in the pipe. A forced toner supply brings it up to spec, which tells me that at least that is working.

The manual is talking about separation power packs etc but there is no logical way to test these.

Please advise if anyone has had this before.

Thanks

[Timmytronic]

Re: mpc7500 - sc411 - GREY HAIRS

Hi

Are the premises very warm, I know its been a few days but maybe just letting it warm up as I have found when I have had stone cold machines and be sat for a while condensation can get on the mirrors and sensors and cause all wonderful and weird problems. I would leave it a few hours and let the fuser warm up the bits and pieces. I know it sounds naff but sometimes the basics work.

If I have any other ideas I will let you know but let us know if this has been done

Thanks

[Jaan]

Re: mpc7500 - sc411 - GREY HAIRS

Good day all.

they new year has a twist in it!

I have an MPC7500 that was working fine till the end of last year. The customer went on leave for 3 weeks and when they returned the machine will do the following:

From cold start all is fine. It will process and start printing Fiery jobs until the first process control mid job. The machine starts process control, then stops and says there was a functional problem and it needs to restart.

After the restart, if i check the sc logs i get 411. Also the process control self check results are 99569999 (56 being low Magenta density)

The magic book as well as goose's guide say the following - which i have done:

Check laser shield glass
Check id sensors

I also followed the procedure in the manual that asks that one prints sp2109002 #12 and then turn off sp2109005008 to 0 and then reprint the test pattern. What bothers me is if i do this, i get a blank A3 sheet after having turned off the settings on 008.

What i cannot understand about the test above is that this only tests the black pcu as there is nowhere to test the other colours.

My main concern is the 411 though.

The machine has said that the magenta toner is almost empty, but checking the bag shows about enough toner, up to where the bag starts to narrow into the "y" shape.

As a precaution I replaced the magenta toner supply, as when i checked it, there was no toner in the pipe. A forced toner supply brings it up to spec, which tells me that at least that is working.

The manual is talking about separation power packs etc but there is no logical way to test these.

Please advise if anyone has had this before.

Thanks

Hey, I bet the problem is with the toner supply pump. Remove the toner hopper, remove the toner end sensor from the magenta pump, and check the amount of the toner below. If it seems empty, the pump is broken. If isn't able to supply enough toner, it causes malfunction in process control.
Method# - try to do a forced toner supply to magenta unit, and run a manual process control.

[Polarbear]

Re: mpc7500 - sc411 - GREY HAIRS - Solved!

Further investigating lead us to check the whole toner supply system.

The more I thought about what the machine was doing, and that doing a 4x forced toner supply to the magenta dev unit let it pass process control, convinced me that the issue was caused by toner starvation of some kind. At this point we already established that the magenta toner supply was working correctly (after the initial check as per my original post - where i found the supply pipe dry and replaced the toner supply pump section with clutches and all).

We discovered that a previous tech had turned off toner end detection - which must have confused the machine.

We turned toner end detection on and set the sp for toner end count (on the magenta) back to 10 from 1 that it was on. [All others were 10 already].
We ran the machine until it asked for toner - removed the toner bag (which still had about 1/3 toner volume in it) and re-inserted it.
The machine toned up and went to ready state. We ran the machine for the rest of the job and all seems to be well as it has done mid job process control at least once in the job run and the sc 411 stayed away....

Will report back if this comes back..... who would have thought the experience with an Spc430 and it's toner supply issues would help me fix an MPC7500? Strange world we live in.