Re: Help diagnose Pianocorder problem -- Pianocorder Forum

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Subject: Re: Help diagnose Pianocorder problem

Author:
Roger Dalziel

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Date Posted: 10:03:53 01/06/03 Mon
In reply to: Dave Snowdy 's message, "Help diagnose Pianocorder problem" on 20:44:59 01/04/03 Sat

Check R33 (10 ohms, 1/2 watt)on the 32-note driver board and R17 (also 10 ohms, 1/2 watt) on the center driver board. These resistors provide a common connection for all emitters of the driver transistors.

A Superscope service bulletin from 1980 suggests a possible cause if you find that the resistor has blown--faulty cable connectors from the 170 volt power supply.

You will note that those connectors are not robust; they are quite wimpy in fact.

Power for the solenoids comes to the center driver board and is distributed to the other drivers from there. The symptoms might not show up until you try to play the piano.

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