Magenta missing in the center

[V-P]

Canon iRC3580

Magenta is missing only in the center as you will see in the attachment.

Life of drums is 50%. I did stir the toner twice and cleaned the sensors.

Can it be caused by 3-rd party toner ? I have no idea what the customer is using.

If not - by what ?


Thnx...


mag-missing.jpg

[teckat]

Re: Magenta missing in the center

Canon iRC3580

Magenta is missing only in the center as you will see in the attachment.

Life of drums is 50%. I did stir the toner twice and cleaned the sensors.

Can it be caused by 3-rd party toner ? I have no idea what the customer is using.

If not - by what ?


Thnx...


[ATTACH=CONFIG]17303[/ATTACH]

Swap the Lasers / to see if it travels

[V-P]

Re: Magenta missing in the center

I was somehow hoping you would suggest smth "faster".

Anyway I already manually checked the mag unit. When I rotate the drum by hand I can see that in the middle it looks like slightly yellowish.
Or more yellowisher than the edges.

thnx

[r3d343420]

Re: Magenta missing in the center

I agree with Teckat. looks like a bad or dirty laser for magenta. Does the developer look like it is covering the entire mag roller? Good luck

[Herrmann]

Re: Magenta missing in the center

X3... Debris on the M Laser Glass, or Laser Error

[zoraldinho]

Re: Magenta missing in the center

I bet on faulty drum.

[V-P]

Re: Magenta missing in the center

It is not the laser. I cleaned them.
I put an old magenta unit inside and the problem went way.

So it was the magenta unit. Will check tomorrow why.

thnx

[zoraldinho]

Re: Magenta missing in the center

smile.jpg

[V-P]

Re: Magenta missing in the center

A bit of update on that case:

We replaced the magenta unit and now the copier printouts look fine.
The problem is that I never had a drum fail like that before, and I have a strong feeling that customer is using 3-rd party toner.
But I cannot prove it.

Is there any way to tell by looking at SM (like density values or smth) ?

I don't want to replace the other one same way as this one.

[teckat]

Re: Magenta missing in the center

A bit of update on that case:

We replaced the magenta unit and now the copier printouts look fine.
The problem is that I never had a drum fail like that before, and I have a strong feeling that customer is using 3-rd party toner.
But I cannot prove it.

Is there any way to tell by looking at SM (like density values or smth) ?

I don't want to replace the other one same way as this one.

Drum Density values change when toner is added from hoppers by machine signals

i would demand to see the OEM BOX & or purchase bill if there is a contract involved---if this is a pay by call for service & parts u have no leg to stand on-

if u personally wrote a contract for customer>>>
if use of non-Canon oem toner/ & or drums is written in contract as being a violation to void such contract/ not much u can do--- this all depends on Country

or>>
if you work for a Canon Authorized dealer / u then have a case> damage to printer parts from non oem toner/starter can result in a automatic void contract/ + customer needs to pay for those parts replaced

[V-P]

Re: Magenta missing in the center

No the copier is not on contract. But we (the company) sold him the first set of drums.
It is more of a moral case rather than obligatory.

"you sold us genuine drums which turned out to be as good as 3-rd party stuff" - this kind of reasoning.

That customer won't show me the bills, but it is my suspicion he is using 3-rd party toner.

I gave a look at his COPIER>DISPLAY>DENS
and DENS M was about -8% while the other colors approx. 0%.

will see how this will turn out

thnx for reading...

[teckat]

Re: Magenta missing in the center

machine corrects the density
of individual colors (Y, M, C). It, however, varies the developing bias for BK

machine uses
the same developing bias for all colors --xcept BK

machine measures the toner image formed on the ITB using the patch image read sensor, and supplies
the drum unit so that the density will be identical to the target density.

so> poor patch =poor density= sometimes an error

if u don't get those e020 patch errors/ no proof in pudding

-8.0 should pop an error soon

DENS-Y/M/C/K
Calculated value of developer concentration (indicated as % off target value)
Appropriate values -2.0 to 2.0%
Note
Value is updated when toner is supplied after main power switch ON.