7232 blank copies

[tech9]

Hi fellow techs i have a 7232 colour box that does blank copies. You change the HVPS and everthing is fine two weeks later same problem, have fitted 3 and this keeps on happening ? Cannot find a short in wiring.
Any tips.:confused::confused::confused:

[tech9]

have changed hvps again along with dev bias and bias lead plus 2nd btr will monitor machine.