Mxc401 error main black rear 56

[gwaddle]

When running 50-22 sometimes get a MAIN BLACK REAR 56 error. Also the skew numbers are all over the place. If you try to adjust for the skew it might throw it off a whole different direction. On the Main Black error, I know what the book says, but haven't found what to do about it. Can someone point me in the right direction?

[ZOOTECH]

How is the image skew in 61-4? That is where you should start, and if 50-22 is way off, I'd run 50-20 and 50-21 to bring it into specs than run 50-22 again to nail it.

[gwaddle]

Thanks. I always start with 61-4 and the skew is good there. Ran 50-20 and just to try something, set all to default. Of course when I ran 50-22 again all the 50-20 settings changed, they are anywhere from 81 to 134.

[ZOOTECH]

Sorry Gene, I got my models crossed, there is no TC 50-21. In 50-22 how far off are the NG colors?

[gwaddle]

Anywhere from 10 to 40 and they change every time you do it. I've seen them go from +30 to -20.

[ZOOTECH]

On earlier models, the adjusting screws would not engage the cams sometimes and cause either wide swings or no adjustment. I haven't had one of these apart yet, but could it be a mechanical problem?

[wtroll]

Hi,
if the error still occurs, maybe you have a problem on the Black Process Unit (dev. unit, drum or laser unit).
Print a test pattern (one for each color) with 64-1 and check if quality is ok.
And don't forget to clear the 2 image density sensors under the transfert belt (the rear sensor also detects registration shift on the machine rear side).

Good luck!

[wtroll]

Oops,
the image density sensors are OVER the transfert belt...

[gwaddle]

I cleaned the density sensors and the code hasn't come back, but I'm still getting wild skew swings from the 50-22. Tried changing the black drum and dv units. No change. Any other thoughts?

[Dark Helmet]

Never had the black error but ive had magenta errors.

enter sim 50-10
A = Black Mag

Every MX3100/4101 ive seen has always been set to 106

I can't remember if i changed it to 90 or 100 (try 100 first) but that got rid of the error. I was then able to run 50-22 and get a reading on which way i need to turn the screws and how many clicks.

I don't know if this is going to help for black as there is no adjustment screw on the black drum.

From what i understood from Sharp Tech support is this adjusts the view of the patches. I guess if it's "zoomed" in to much it can't see all of them? Not exactly sure but it has worked for the color phase/shift errors.

Something to try. Let us know!

[gwaddle]

Thanks Lawrence, but this is an MXC401 and I think I got rid of the error, but the 50-22 skew numbers are still jumping around all over the place.

[Dark Helmet]

It's the same procedure i believe

[gwaddle]

It seems that a firmware update may have done the trick. Thanks for all the input. By the way, don't tell Wazza that I didn't think of doing firmware first.

[OMD-227]

Ouch!

There's nothing in the full list of Frontier firmware revisions that have anything to do with fixing registration errors.
I have problems with rego settings on the Frontiers all the time, but it never really seems to affect any print quality. As the rego sensors are in a different location to the MX machines, and the belt assy is so flimsy & only screwed into place by half-turn thumb screws, I've always assumed the machine cannot put good patches down on the belt as there might be some very minor movement/shift in belt surface so the sensors cannot read it properly. I've never got a full answer from anyone else either on this matter.

I didnt chip in on this post as it is just something that happens, and everything I've tried doesn't make any difference. Nothing I could really help anyone with. But.... the machine works fine. Its just the rego numbers that are out and playing with my mind.

P.S. Do your firmware!!!