why does my color look like this? how can i correct this please?

[D_L_P]

Which part can be?
As i installed new 2nd transfer unit
I swapped with another bizhub PRESS c8000 intermediate full unit
Still the same

Paper is ok 105 grs plain bond
Same print on same paper but another BH C8000 looks great

Attachment 38143

Same test pattern, same paper, different machine
Left, C8000 with this trouble
Right, C8000, fine

Look at differences, on the left it is very noisy, and many non coulor whiteish noise,
On right, only black lacks density, but all others just fine

Thanks for your help in advance

If you've eliminated 2nd transfer it may be your developer units.
Do you use non-oem toner? Sometimes mixing oem and non-oem gets weird patterns like that.

If the developer is fairly new or oem, check and clean the bias contacts. Your HV pcb may have a weak output since it happens on other colors.

[stuckmx]

@AjitN
enviroment humidity is okay, around 50~ish

@D_L_P
thanks gonna check the contacts for HV
developer fairly new only 22k copies ago, using only oem supplies

thank you both

[habik]

I don't do production machines but wonder one thing.
What is your TCR levels like?
Can you adjust/increase TCR lelvels for CMK units to see if image gets denser?

Btw the black on the Good C8000 looks washed to me.