I'm working on a Wurlitzer spinet piano with the model 1203 player
mechanism [pneumatic reader & pouch switches operate solenoids].
Everything in the player behaves just fine except the vacuum pump
-- not even a grunt out of it.  So either the pump is blown, or it's
not getting the signal to come on.

Where should I begin diagnosing?  I know I could check to see
if there's power to the pump, but I don't have a circuit tester.
What voltage am I looking at?  Has it been stepped down, or is it
at 110 volts?

If there's no power to the pump, can I hot wire the pump (is it
110-volt) to check its condition?  If there's no power to the pump,
are we now into a circuit board problem?  (The wiring looks to be
in mint condition).  If it's a circuit board, how involved is it for
the electronically illiterate?  Many thanks to anyone who has learned
input on this.

Skip Downing
Lebanon, New Hampshire, USA