problem with Fanuc A14B-0067-B001 power supplies

I acquired several Fanuc A14B-0067-B001 power supplies, and
they all seem to have a similar problem, which I haven’t been able to
track down yet. When you power them up, the +5VDC on the terminal strip
is OK, but the +24VDC is very low to non-existent. The -15VDC is at
about -11V, and the +15VDC is very low, or non-existent. If I cycle
the supply a few times it might start working perfectly. Perfectly,
except for the slight “sizzling” sound coming from somewhere. Possibly
after the main transformer T14. Has anyone seen this erratic behavior?

answer:

if this is a linear power supply the filter capacitors are probably shot and short circuiting
internally. Hence the sizzle sound. Transformers are generally the last things to fail.

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