"electroninja" writes:

Have never used the probe since I've owned it and not sure where it is.
The probe socket wiring routes directly to the control board. Any
suggestions for trouble shooting the board--part suppliers don't seem
to carry control boards for the Sharp R1800.

Did you run the test disconnecting the HV transformer? Don't even bother
with a load at first, just see what happens.

--- sam | Sci.Electronics.Repair FAQ Mirror: http://repairfaq.ece.drexel.edu/
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