PLEASE READ THIS CAREFULLY... (re XSP-1 power supply)The original power supply design was capable of operating at either 120 VAC or 230 VAC.
However, over the years, we have found that it is more likely to fail over time when running at 230 VAC.
And, as a result, there were some production changes that we started applying to units that came in for repair.
We also applied this update to some units that were shipped to areas where the line voltage is 230 VAC.
WHILE NOT NECESSARY FOR PROPER OPERATION THESE CHANGES WILL MAKE THE UNIT MORE RELIABLE IN THE LONG TERM IF OPERATED AT 230 VAC.
Note specifically that several diodes are replaced with identical units... but the replacements are spaced above the board while the originals were mounted flush.
This extra clearance provides just enough extra air flow to enable them to run a little cooler... which does affect their long-term life expectancy.
(If the diodes in your unit are spaced above the circuit board then you already have this update.)
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This upgrade could be performed by any competent repair tech or repair shop.
Likewise any competent repair shop should be able to REPAIR this power supply if necessary (and we would be glad to share schematics with them - on request)
I guess running the unit from an external 220V to 120 V transformer would accomplish the same thing...
But it seems like the long way around to me.