MX-2640N Black Copy/Print lost Quality - Gradient Image

[ezugaru]

Hi guys, Thank you in advance for your help with this.

We've been working on a MX-2640N MFP that is having gradient image and lost quality only in black, when we use full color copies/prints there is no problem, so when we use pure black there is this situation, the machine starts fresh doing the work right, but with use the quality starts to drop...if we let it rest for some minutes then it fixes and then start over failing...

We have the firmware up to date and also we have tried changing LSU, Full Process (Drum, MC Unit, Developer, CL Blade), we have changed High Voltage PWB, AC/DC PWB...so we are running out of ideas...what is left to us is to change the MFP PWB in case there could be a logical problem causing this...Hope you could help us out.

Thanks for your support

IMG-20160628-WA0008.jpg

[ZOOTECH]

Re: MX-2640N Black Copy/Print lost Quality - Gradient Image

You didn't mention the Primary Transfer Unit - jam the machine midway, and check if the image is there or not.

[ezugaru]

Re: MX-2640N Black Copy/Print lost Quality - Gradient Image

You didn't mention the Primary Transfer Unit - jam the machine midway, and check if the image is there or not.

Hi, we have already tried a new 1st transfer belt unit.

Thanks

[SwisSeV]

Re: MX-2640N Black Copy/Print lost Quality - Gradient Image

Are the DV unit levels good? Did you try new toner?

[JR2ALTA]

Re: MX-2640N Black Copy/Print lost Quality - Gradient Image

I don't know what that example is supposed to look like. Can you provide a good sample?

[chubblies]

Re: MX-2640N Black Copy/Print lost Quality - Gradient Image

Run the machine with the front door open and check the cam position of the primary transfer belt as it cams the rollers up and down, I have had the clutch lag before now which in turn causes poor transfer, and you could see the up/down position of the cam was in the incorrect position.

[brokey]

Re: MX-2640N Black Copy/Print lost Quality - Gradient Image

There are two clutches that control the position of the transfer belt during printing. One for color and the other for black and white, and what you described sounds as if the one that controls the black and white position is slipping.

[ezugaru]

Re: MX-2640N Black Copy/Print lost Quality - Gradient Image

Are the DV unit levels good? Did you try new toner?

Hi, yeah we have replaced the Developer with a new charge, and even swap units.

[ezugaru]

Re: MX-2640N Black Copy/Print lost Quality - Gradient Image

You didn't mention the Primary Transfer Unit - jam the machine midway, and check if the image is there or not.

Will check, we ran out of toner testing this... >.<

[ezugaru]

Re: MX-2640N Black Copy/Print lost Quality - Gradient Image

Run the machine with the front door open and check the cam position of the primary transfer belt as it cams the rollers up and down, I have had the clutch lag before now which in turn causes poor transfer, and you could see the up/down position of the cam was in the incorrect position.

Ok, will check clutches, thanks!!!

[ezugaru]

Re: MX-2640N Black Copy/Print lost Quality - Gradient Image

There are two clutches that control the position of the transfer belt during printing. One for color and the other for black and white, and what you described sounds as if the one that controls the black and white position is slipping.

Oki, we'll check the clutches as it seems to be something commom in your experience guys!

Thanks!

[harisjameelpk]

Re: MX-2640N Black Copy/Print lost Quality - Gradient Image

Check drum

Sent from my 0PJA10 using Tapatalk

[ezugaru]

Re: MX-2640N Black Copy/Print lost Quality - Gradient Image

Check drum

Sent from my 0PJA10 using Tapatalk

Hi, we've already checked the drum, MC Unit and Cleaning Blade, even swapped components.

[ezugaru]

Re: MX-2640N Black Copy/Print lost Quality - Gradient Image

Are the DV unit levels good? Did you try new toner?

Hi, DV levels are good, we already replaced the developer thinking it could be contaminated.