MPC6501 and MPC4501 fails ACC

[Smee]

Hey guys,

Ive got 2 machines literally side by side. One's a MPC6501 and the other is a MPC4501. Both fail Copy ACC and when I print out the printer ACC, the colours are waaaay out of whack. The colour density dosnt go darker slowly...its light then dark really suddenly, dosn't increment gradually at all on all resolutions. On all colours.

Also the internal test page from SP 1103-2 shows the raw K,C,M,Y colours fine but the mixed colours R,G,B are waaaaaay out.

And both machines are doing exactly the same thing - I dont even know where to start here! The only thing in common is that they are behind a huge window and the sun shines in all day. Surely this wouldnt do anything tho!

All PM parts are well within their life....Ill post samples tomorrow as im writing this from home. I read somewhere the memory DIMMS can cause this?

[rich2764]

Re: MPC6501 and MPC4501 fails ACC

Sounds like corrupted NVRam if you have exhausted all other avenues. Do a nvram backup and then memory all clear and re enter the values on the factory sheet inside the door.

[turbojetboy]

Re: MPC6501 and MPC4501 fails ACC

Sounds like corrupted NVRam. Do a memory all clear and re enter the values on the factory sheet inside the door.

DONT DO THIS UNTIL YOU HAVE BACKED IT UP! Only do this if you have a confirmed backup of the NV Ram data so you can quickly and easily restore the machine. Fact is in 27 years of fixing copiers I can count on one hand how many times a memory clear has fixed things.

[CableGuy]

Re: MPC6501 and MPC4501 fails ACC

Sounds like corrupted NVRam. Do a memory all clear and re enter the values on the factory sheet inside the door.

Slow down tiger!!.... bad advice at this point.....

[CableGuy]

Re: MPC6501 and MPC4501 fails ACC

Run a process control and see if there any errors on the SP data?

Also, is there a possiblility that the power supply to the room is faulty?

Is it possible to move the smaller machine to another location and try it there?

[rich2764]

Re: MPC6501 and MPC4501 fails ACC

I'm only speaking from experience. The fact that Smee's machines BOTH had identical faults at the same time which would indicate that there was a power related issue that caused corruption. It is mentioned in one of the RTB's to do the memory clear. Also on one of my machines I was working on, the controller NVRam's lithium back up battery was low at 0.9v! I had assumed Smee had already tried the process control and music check etc. I have edited my original post to make it more clear.

[CableGuy]

Re: MPC6501 and MPC4501 fails ACC

Last resort, is the best way to put out that advice. The only time I've had to reload the info manually is when a customer found out on the internet how to do the clear, thought it would clear his fuser error.... He was lucky the machines birth certificate was still handy. On a beast like a MPC6501, it'll take you some time to get that sorted and it will never be the same.

I'm really leaning towards some sort of power supply problem in the room.

[rsyarcia]

Re: MPC6501 and MPC4501 fails ACC

hello smee, have this before and cleaning the laser unit solved the problem. before doing some of the "good advices" , do this.clean!clean! clean!

[teebee1234]

Re: MPC6501 and MPC4501 fails ACC

Hey guys,

Ive got 2 machines literally side by side. One's a MPC6501 and the other is a MPC4501. Both fail Copy ACC and when I print out the printer ACC, the colours are waaaay out of whack. The colour density dosnt go darker slowly...its light then dark really suddenly, dosn't increment gradually at all on all resolutions. On all colours.

Also the internal test page from SP 1103-2 shows the raw K,C,M,Y colours fine but the mixed colours R,G,B are waaaaaay out.

And both machines are doing exactly the same thing - I dont even know where to start here! The only thing in common is that they are behind a huge window and the sun shines in all day. Surely this wouldnt do anything tho!

All PM parts are well within their life....Ill post samples tomorrow as im writing this from home. I read somewhere the memory DIMMS can cause this?

I had the almost the exact same problem last week, the copier calibration sheet looked fine but the printer sheet was whacked - no gradation on black and only the first three gamma blocks (high) were visible on CMY, the rest of the column was blank. Same thing on the printer color test sheet. Doing a memory clear on the Printer application only resolved it (5-801-8).

[Iowatech]

Re: MPC6501 and MPC4501 fails ACC

I agree with rsyarcia, cleaning is your best option.
As the ID sensors are important to process control which determines how the colors line up on the ITB, I'd suggest you clean those, too. If there is a particular color of toner contaminating those sensors, you might need to replace that color developer.

[Smee]

Re: MPC6501 and MPC4501 fails ACC

Awesome guys, youve given me a few decent ideas. Thanks heaps and Ill reply how it went.

Ive attached the samples to maybe make it clearer!

[teebee1234]

Re: MPC6501 and MPC4501 fails ACC

Looking at your sample I'm convinced it's corrupted data and not laser or ID sensors. My situation was almost exactly the same, missing the lows only (notice the vertical and horizontal bars are ok). Clear the Printer application memory before you do anything else. I wasted a lot of time and parts following the guidelines from tech support before it was suggested to do that, and it worked.

[limo]

Re: MPC6501 and MPC4501 fails ACC

Try using PRINTER SP 1101 to recall the factory gamma settings to check the test page.If that fails you can recall the previous data(current)

[Oze]

Re: MPC6501 and MPC4501 fails ACC

Run a process control and see if there any errors on the SP data?

Also, is there a possiblility that the power supply to the room is faulty?

Is it possible to move the smaller machine to another location and try it there?

+1 for the room voltages

[Counsel]

Re: MPC6501 and MPC4501 fails ACC

Is it just me or does it look like you have crapy charge rollers, i see lines and within the black pattern there is a green line on both machines its washed out. I dont know that it will fix what your trying to. Just an observation.