Here's the link, check page 27 for right voltage connection.
http://www.millerwelds.com/om/o223aw_mil.pdf
your problem is that your output is less than normal
first you isolate h/output from power supply if it comes to normal(115V).
then problem in h/output stage
for that you check
h/output,cap & diode in flyback section & flyback transformer.
but power output is still 50v then problem in power supply for that check oscillator ckt & switching output.
good luck.
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