Login ] [ Contact Forum Admin ] [ Main index ] [ Post a new message ] [ Search | Check update time | Archives: 12 ]
Subject: Re: 3 way plugs on Marantz pc-1145 player piano

Roger Dalziel
[ Next Thread | Previous Thread | Next Message | Previous Message ]
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.

[ Next Thread | Previous Thread | Next Message | Previous Message ]

Login ] Create Account Not required to post.
Post a public reply to this message | Go post a new public message
* HTML allowed in marked fields.
Message subject (required):

Name (required):

  E-mail address (optional):

* Type your message here:

Notice: Copies of your message may remain on this and other systems on internet. Please be respectful.

[ Contact Forum Admin ]

Forum timezone: GMT-6
VF Version: 3.00b, ConfDB:
Before posting please read our privacy policy.
VoyForums(tm) is a Free Service from Voyager Info-Systems.
Copyright © 1998-2017 Voyager Info-Systems. All Rights Reserved.