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Subject: Re: 3 way plugs on Marantz pc-1145 player piano

Roger Dalziel
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Date Posted: 10:49:35 02/22/08 Fri
In reply to: Stuart Baker 's message, "3 way plugs on Marantz pc-1145 player piano" on 16:25:49 02/21/08 Thu

Restoring the three-wire plug was probably a good idea, in that the green wire grounds the power supply chassis and the "harp" to drain off any static electricity that might accumulate. I can't think of any good reason for having disconnected it in the first place, although as you note, no harm was done.

The Pianocorder +170 volt power supply is like an old "hot chassis" AC/DC radio set. The negative terminal is at -85 volts with respect to AC neutral; similarly, the positive terminal is +85 volts with respect to AC neutral. Use of grounded test equipment is guaranteed to blow every IC on the printed circuit boards!! I wasn't paying attention one day and managed to do just that.

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