C450i eat toner

[jwai]

now i have one C450i consumed toner abnormally.
one new Y toner only used approx 3 days and less than 10k copies.
the waste toner bottle are filled with Y toner.

I checked that a thin coating on the surface of Y drum, the TCR ratios are all 6.XX%.
The ATVC of C M are 20, K is 22, Y is 16.

[Synaux]

Meter on Y IU?

[allan]

25K @ 5% coverage.
12.5K @ 10%
7.25K @ 20%

Could be that they are printing heavy coverage yellow?

Check coverage history.
Reset coverage counter...

[jwai]

Meter on Y IU?

the color counter is 120K something and 25K on black.

[jwai]

25K @ 5% coverage.
12.5K @ 10%
7.25K @ 20%

Could be that they are printing heavy coverage yellow?

Check coverage history.
Reset coverage counter...

They mainly print some office document such as word, excel, autocad.
the color ratio on printout is quite low.

[allan]

They mainly print some office document such as word, excel, autocad.
the color ratio on printout is quite low.

Ask them if what they printed over that time. Could have pushed some kind of flyer or marketing document.
Check coverage report anyway

Print a Y half tone @50/255 on a healthy machine and compare it. If its dark then it could be low main charge or even developer.

If i cant see anything else wrong i would try and increase the value of the yellow background adjustment to +3 and TCR on Y to -1/-2.
That would push more charge and decrease toner concentration. Then wait for the call to return or not, or next toner delivery.

When it comes to aftermarket toner yellow is the worst!

Reset the values when replacing the Y drum/dev.

[jwai]

Ask them if what they printed over that time. Could have pushed some kind of flyer or marketing document.
Check coverage report anyway

Print a Y half tone @50/255 on a healthy machine and compare it. If its dark then it could be low main charge or even developer.

If i cant see anything else wrong i would try and increase the value of the yellow background adjustment to +3 and TCR on Y to -1/-2.
That would push more charge and decrease toner concentration. Then wait for the call to return or not, or next toner delivery.

When it comes to aftermarket toner yellow is the worst!

Reset the values when replacing the Y drum/dev.

Print head, would be the cause I guess?

[allan]

Print head, would be the cause I guess?

No that would be a visible defect. I'm out.

[jwai]

Ask them if what they printed over that time. Could have pushed some kind of flyer or marketing document.
Check coverage report anyway

Print a Y half tone @50/255 on a healthy machine and compare it. If its dark then it could be low main charge or even developer.

If i cant see anything else wrong i would try and increase the value of the yellow background adjustment to +3 and TCR on Y to -1/-2.
That would push more charge and decrease toner concentration. Then wait for the call to return or not, or next toner delivery.

When it comes to aftermarket toner yellow is the worst!

Reset the values when replacing the Y drum/dev.

Nowadays I can't print half tone test print from defective machine.
The machine shows add toner Y and stop color print, I installed a new Y toner and remain has this warning screen after 5 minutes of auto toner replenishing.

[allan]

Nowadays I can't print half tone test print from defective machine.
The machine shows add toner Y and stop color print, I installed a new Y toner and remain has this warning screen after 5 minutes of auto toner replenishing.

Change the drum unit... from Y to C or M to test if problem stays on Y or moves. Or just change it. Are you using original toner?