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In Reply to: RE: My mx110 has hot chassis posted by violinist3 on August 06, 2017 at 11:51:20
Later Gator,
Dave
Follow Ups:
I can't feel it with my hand but I once bent over the unit and my lip touched it and I could feel it.
Edits: 08/06/17
This unit has two bypass caps from the AC line to the chassis. It also has a two-wire line cord, so the chassis isn't grounded. The solution for the problem is to remove the capacitors and install a three-wire line cord. Leave the power transformer alone.
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Buy Chinese. Bury freedom.
I once had an MC240 power amp that acted that way and one day when connecting the preamp I got a small flash or spark at the input jack.
I don't know what made me do it, hunch maybe, but I unscrewed the power xfmr and was able to lift it enough to see that one of the wires had been crushed between the bottom of the xfmr and chassis. I was able to unsolder that wire, feed some heat shrink over it and that problem went away.
I've seen this, esp after PT repairs. Check any circuit boards for hot contacts to ground. Like wires poking through the boards.
I'm not sure if your unit has a ground-hum switch with a built-in "death-cap." If so, you may want to go to 3-prong outlet wiring with permanent green wire grounded to chassis. Remove the hum switch and death cap from circuit... at least electrically.
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