[CQ] Bizhub C454, Cyan background/ghosting

[D Colour]

Hi
Have a problem with a C454 (Olivetti MF452). Its a cyan background or ghosting on the prints.
A4.jpg
^That is fed long edge first. A4

A3.jpg
^A3 is obviously SEF

So far we have tried:
swapping yellow and cyan drums - no change.
fitting a used (but known working) cyan dev - no change.
replaced the transfer belt (used, but working) - no change.
cleaned lasers and ran multiple stabilisations - no change.

The machine recently had a new fuser fitted to fix a C3726 error.

Thinking it could be a bad earth or the voltages are up the left, anyone had this before?

[copier tech]

Re: Bizhub C454, Cyan background/ghosting

Is this issue just with cyan? difficult to see from your scans.

Are you using genuine KM toner?

[D Colour]

Re: Bizhub C454, Cyan background/ghosting

Is this issue just with cyan? difficult to see from your scans.

Are you using genuine KM toner?

Hi Copier Tech, the background/ghosting is only cyan yes. I did scan it but it didn't show up at all in those so i took a couple of photos.

Its is compatible toner in the machine, but this machine (and others) has been running on it for years with no issues. Haven't seen a similar problem in other machines using the same stuff. What are you thinking? I'm open to all possibilities.

[Max]

Re: Bizhub C454, Cyan background/ghosting

Fit a new km dev unit and drum so the copier will initialise it and configure for that particula dev unit/drum. By fitting a used dev unit the copier will still use old dev settings. Basicaly no change.

[habik]

Re: Bizhub C454, Cyan background/ghosting

Vac the cyan hopper and run 20 halftones for cyan@255 A3 with no toner bottle installed.
Check TCR levels %
When machine asks for toner fit fresh bottle and do manual toner add.
Run another 20 X cyan halftones and check if TCR % is stable around 6.3-6.6%.

Now initialise+stabilise background reset and do full gradation adjust.

If it won't work then replace with new Dev& drum at same time as mentioned above.

What is the mileage of the Dev unit?

Sent from my Mi A1 using Tapatalk

[D Colour]

Re: Bizhub C454, Cyan background/ghosting

What is the mileage of the Dev unit?

Hi Habik, thanks for the info.

There is 447k on the colour devs, so they are far away from needing changed anyway. Will try the above and see how that goes.

[Albonline]

Re: Bizhub C454, Cyan background/ghosting

is the black misting/spewing developer? whats the life on the black drum and developer. have seen this when they are shot. they contaminate the cyan.

[D Colour]

Re: Bizhub C454, Cyan background/ghosting

is the black misting/spewing developer? whats the life on the black drum and developer. have seen this when they are shot. they contaminate the cyan.

Mono copies & prints are perfect. It had all the drums replaced a couple of months ago. Theres approx 10k on the K drum and maybe 15k on the colours.

Im not sure about the black dev looking at this (Its at least close to life). The black dev has or has not run over its life - according to the management list, the total count is 572256, but according to the life counter, black dev is 626736. The machine is on a per copy contract so all the life and stops are turned off.

[Albonline]

Re: Bizhub C454, Cyan background/ghosting

if its misting change it out. the colors are setup off of the black. are your color developers especially the cyan depleting? all signs of black problems.looking at you prints i see a ghost image thats whats got me saying you have a hv problem caused by overworn black imaging system.

[Quatro]

Re: Bizhub C454, Cyan background/ghosting

Hi
Have a problem with a C454 (Olivetti MF452). Its a cyan background or ghosting on the prints.
[ATTACH=CONFIG]38123[/ATTACH]
^That is fed long edge first. A4

[ATTACH=CONFIG]38124[/ATTACH]
^A3 is obviously SEF

So far we have tried:
swapping yellow and cyan drums - no change.
fitting a used (but known working) cyan dev - no change.
replaced the transfer belt (used, but working) - no change.
cleaned lasers and ran multiple stabilisations - no change.

The machine recently had a new fuser fitted to fix a C3726 error.

Thinking it could be a bad earth or the voltages are up the left, anyone had this before?

Hi,

I think you have problem on HV.
When you stabilize it shows NG or no?

[D Colour]

Re: Bizhub C454, Cyan background/ghosting

Hi,

When you stabilize it shows NG or no?

Its NG - no good.

[habik]

Re: Bizhub C454, Cyan background/ghosting

Hi,

I think you have problem on HV.
When you stabilize it shows NG or no?

NG Can happen as well when background is set to max.

Sent from my Mi A1 using Tapatalk

[habik]

Re: Bizhub C454, Cyan background/ghosting

Hi Habik, thanks for the info.

There is 447k on the colour devs, so they are far away from needing changed anyway. Will try the above and see how that goes.

OK let us know.

If you have spare HV and K Dev, take it.

Before you start changing bits can you print CMYK gradation test and halftones around 60?

Sent from my Mi A1 using Tapatalk

[Quatro]

Re: Bizhub C454, Cyan background/ghosting

Its NG - no good.

Better test the HV and as much as possible if you cab change the DV unit of cyan,
As per your sample Cyan is some what like over toner,

[copier tech]

Re: Bizhub C454, Cyan background/ghosting

OK let us know.

If you have spare HV and K Dev, take it.

Before you start changing bits can you print CMYK gradation test and halftones around 60?

Sent from my Mi A1 using Tapatalk

Poster is using compatible toner, I would always suspect that first before looking at a hardware issue.