Sharp MX5112 Banding (mainly on pastel or light colours)

[hammer]

Hi All,

We have just put out 6 * MX5112's and three of them have a banding effect on light colours & pastels. We set up a machine in the office and ran a full calibration to make sure we didn't do anything silly with the other machines, but can see the beginning of it. The 5112's are all new, very low volume (in the 100's) and we are stuck.
The attachment showing the black image shows a weakness of colour running from front to back as well as the banding.
The attachment showing the yellow image is harder to see the banding, but it is there.

Any assistance would be greatly appreciated

[mojorolla]

Re: Sharp MX5112 Banding (mainly on pastel or light colours)

Did you run SIM 63-8 and 67-28 after the calibrations?

[hammer]

Re: Sharp MX5112 Banding (mainly on pastel or light colours)

No, what do they do? They were not listed on any set up procedure.

[mojorolla]

Re: Sharp MX5112 Banding (mainly on pastel or light colours)

They are for the calibration targets, copy and print. My Sharp rep said they must be run after calibration. Although, with it just being released, who knows after the 2610 fuser disaster.

[hammer]

Re: Sharp MX5112 Banding (mainly on pastel or light colours)

We have just run some tests on this and we jammed the machine while printing a cyan test pattern. Luckily we got two thirds of the image on the primary transfer belt. It definitely looks as though the rear of the image is solid, while the front is less solid. The cyan at the rear looks nice and blue, but the front cyan looks darker, (which is caused by less density of cyan on the belt, allowing the belt to show through).

[chubblies]

Re: Sharp MX5112 Banding (mainly on pastel or light colours)

What is the dev coverage like? Ie any difference in the brush front to rear? It def looks like a dev issue of some sort

[hammer]

Re: Sharp MX5112 Banding (mainly on pastel or light colours)

Thanks for that, but the brush is fine (lovely actually). Its across all colours, so if we were looking at dev, I think it would be more a power pack issue. We switched drum units with no difference. Do you ever get the feeling new machine faults are hunting you down!

[mojorolla]

Re: Sharp MX5112 Banding (mainly on pastel or light colours)

Pull the toners and run SIM 25-1. Anything real high or real low? Also check the high voltage board. There are plastic clips holding the board in and they can snap or slip out of contact. When you stopped it was it pre or post fusing? I will also mention I had a 2610 that blew a laser at 202 copies, but it gave errors. And yes, new machines are a pain in the %#$!

[hammer]

Re: Sharp MX5112 Banding (mainly on pastel or light colours)

I'll run those sim's on Monday morning when i'm back in the office. When we jammed the machine we got both scenarios. When we jammed it in the fuser we didn't have much image left on the primary belt. This sample showed the issue, but we couldn't pinpoint the route cause from that. The next jams we tried to jam the machine as the lead edge hit the secondary transfer. This gave us plenty of image on the primary belt and it is here that we noticed a difference between rear and front. The image on the primary belt was definitely more solid at the rear, for about 2 inches towards the front, then it began to fade, showing bands until overall loss of density towards the front.

[mojorolla]

Re: Sharp MX5112 Banding (mainly on pastel or light colours)

If the image on the belt is uneven, I would reseat the HV board and/or run the HV adjustments. How does the cam inside the belt function? Please let us now how it works out.

[mojorolla]

Re: Sharp MX5112 Banding (mainly on pastel or light colours)

Just thought of 2 more things. Is it on a 20amp breaker? Do they all have ESP surge protector? The new machines don't seem to like them.

[hammer]

Re: Sharp MX5112 Banding (mainly on pastel or light colours)

Which HV adjustments are you referring to?

[mojorolla]

Re: Sharp MX5112 Banding (mainly on pastel or light colours)

ADJ.2 which are SIMS 8-1,8-2, and 8-6.

[hammer]

Re: Sharp MX5112 Banding (mainly on pastel or light colours)

Hi All, just to update you on this long running saga - there was really two issues here. The banding was caused by the dev unit. We switched the dev unit with one from a new machine and the fault went away. However, in saying that, we ran numerous print samples and could see very slight bands. We are probably being over critical. Test chart pages are perfect. Still no answer to the fading from rear to front though. The fading isn't too much of an issue as it is only noticeable on certain sample prints using SIM 64. Thanks for your responses over the while.

[mojorolla]

Re: Sharp MX5112 Banding (mainly on pastel or light colours)

They just released a new fuser belt type for this model to prevent "toner dusting" I guess that is engineer speak for "crappy copy quality".