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brenni
11-25-2010, 01:11 PM
Hi,

on my C450p i have poor image density on C and M; Y and Bk are working perfect.
I already changed:
- IUs; (tried several brank new)
- transfer roller
- belt
- TCR sensors
- LPH LED assy

any ideas where to go next?

mrwho
11-25-2010, 01:37 PM
Did you begin by calibrating the machine?

brenni
11-25-2010, 02:11 PM
calibrating? as in xrite or gretag?
the problem is even with testprint from the machine (gradation test prints for exampel) the coverage is low. looks like spots missing

mrwho
11-25-2010, 02:30 PM
I'd check the HV contacts next, then. And, if possible, try with a different HV board.

brenni
11-25-2010, 03:40 PM
which one? hv1 or 2?

brenni
11-26-2010, 12:27 PM
Solved.

it was a cleaning issue.
cleaned all HV contacts above LPH assey in the back of the machine, grad adjust and voila thats it!

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