Hi All, As many of you know, Player Piano Co. has been producing
a vacuum pump kit for player pianos for many years. In the early years
of production, PPCo used American-made parts. However, back around
1997, RCA stopped making the diac and triac used in the controller.
Subsequently, the parts came from Taiwan, Hong Kong and Mexico, and
the failure rate increased dramatically.
For those who have systems that were made after 1997 that have stopped
working, I have finally located the schematic for the controller.
I've sent the schematic to MMD and hopefully it will be put into the
Technical Section at the MMD web site. Suitable replacement parts are
available from Radio Shack.
I have also stored the schematic at Player-Care. See:
John A. Tuttle
Brick, NJ, USA
[ Thanks for the information, John; I'll place it at
[ http://mmd.foxtail.com/Tech -- Robbie