Bizhub C280 ,dots on the surface of drums

[pinspin]

Hello. We have several C280 copiers with the same problem. After 40K - 60K copies, dots appear on the surface of the color drums. The black drums are fine. The fault is returned after replacing the drum units. Replacing the main power supply, high-voltage power supply, transfer did not help. We will be grateful for any advice.

[907tec]

Re: Bizhub C280 ,dots on the surface of drums

Hate to ask, but... are you using OEM toner?

[AjitN]

Re: Bizhub C280 ,dots on the surface of drums

Hate to ask, but... are you using OEM toner?

I don't think it is OEM Toner, even if Cartridge OR packing box looks like original.
It cannot happen that many machines have same problem, something must be common - TONER.
Also I have faced this problem many couple of times.
Hope it helps

[pinspin]

Re: Bizhub C280 ,dots on the surface of drums

Hate to ask, but... are you using OEM toner?

toner is original

[Zesti]

Re: Bizhub C280 ,dots on the surface of drums

I agree with Ajit. PiNSPIN, don't know which country are you from and what environmental conditions you have there. Check for excessive humidity.
How many machines having same problem we are talking about?

[allan]

Re: Bizhub C280 ,dots on the surface of drums

Post a printed image with those drums. Make sure all adjustments like the background adjustment is set to 0. Or initialize the machine.

[pinspin]

Re: Bizhub C280 ,dots on the surface of drums

Thanks friends . We will try to change the toner supplier.

[AjitN]

Re: Bizhub C280 ,dots on the surface of drums

Thanks friends . We will try to change the toner supplier.

I do not blame supplier as they only purchase form somebody and sale to others, they even do not know the impact of this.
I have seen everything looks like original (Packing + Price tag + bottle etc.) but toner is not original and many suppliers sale that as OEM toner ( I don't blame them ) as even we qualified & experience engineers do not judge that just be visual unless we use them.
So my friend, never blindly believe in it even it looks like original, unless you have purchased directly from the company. (Especially when you have many such machines having same problem, only common thing is TONER,)

[MORGY]

Re: Bizhub C280 ,dots on the surface of drums

Had the same fault on C280. Removed the toners and emptied and cleaned the sub toner hopper. Replaced developers and drums and all was good.

I am not sure of the cause of this but am suspecting humidity.

Thanks

[AjitN]

Re: Bizhub C280 ,dots on the surface of drums

Had the same fault on C280. Removed the toners and emptied and cleaned the sub toner hopper. Replaced developers and drums and all was good.

I am not sure of the cause of this but am suspecting humidity.

Thanks

I think humidity around 40 to 70 is good for CQ.
Very low will give cloudy effect (Smoothness especially in highlight areas gets hampered)
Extreme Humidity will make toner and dispensing components sticky.