Problem in Uv printing

Hi ,
My machine Heidelburg 28/40 2 colour sheet feed

Problem
Few month back we start Uv printing
When we switch from Uv printing to
Conventional printing , we are unable to control water . In some cases even in Uv printing . Because of this now I am unable to print to print both Uv and conventional printing . Pls guide to overcome this issue

 

Hi sir:
Please tight all connection or control for UV, possible loose, corroded, or connector faulty or loose.
2) clean the boar of UV, in the Edge connector, with eraser pencil, very well, corroded, and thin film of dust.
and then spray with clean contacts cleaner the edge connector receptacle female.
3) If the problem persist, after you did that, the Thyristor faulty, replace Board( Mobo)