CLX-6260FW prints blank pages

[Bojan2]

Hi,

My CLX6260FW prints blank pages now (it started as very occasional issue at first, now it is permanent problem).

I suspect HVPS, LSU. Is there a way to check voltages to diagnose the fault?

Also, when calibrating/printing, there is a distinctive sound "thp-thp-thp-thp" (yes, four times.. there are 4 toner cartridges.. coincidental?), I do nor remember hearing it before (when everything was OK).

Thank in advance for your help.

Bojan

EDIT:
I also tried "half test" (open door when half of the paper was in) and there was no image on the drum (black). I measured voltages on HVPS board, K-section, they are there.
So it seems LSU remains as prime suspect?

EDIT2:
After fiddling with LSU connector on Main (processor) board, it started to print (more often). It looks like something is intermittent... I also removed the board and inspected connector under the microscope.. no obvious issues are visible.

[Bojan2]

It seems most of the time printer will copy only one page after moving cable/connector, but not print from comp...

Would that indicate the Main board problem?

[Bojan2]

I replaced Main board with another one and the problem is still there.

Now I need to either repair old LSU, or replace it with working one.

Could anyone help me to locate the replacement?

Thanks in advance!