[HAM] Alignment of Start Motor. Warning about exposed AC mains

[Kon Zissis]

, Kon Zissis wrote:
>there is an exposed   solder terminal  on the plastic bobbin of the
>start motor coil  and there is always live AC voltage on this  solder
>terminal  even when the organ is switched off.
 
Scott Hawthorn replied:
>Preposterous!
 
Hi Scott and everyone. 
The start switch and the run switch  are both  single pole switches that
either switch on or off only the  AC neutral  voltage signal whilst the
unswitched live AC active signal  goes directly to one end of the coils
of the start motor , the run motor and the primary winding of the power
transformer as shown on the AO28 schematic.
 
I just double checked the wiring of my 1962 C3  which runs on the
Australian 240 volts / 50 Hz system  and the start switch and the run
switch control the  AC neutral voltage signal ( blue wire ) whilst the
AC active voltage signal ( brown wire ) is always present at the
unswitched side of the start motor coil and the  run motor coil and the
primary winding of the power transformer.  When the start switch and the
run switch are turned off the electrical circuit is incomplete so
therefore the  motors and the AO28 preamp  are not working.
 
The start motor coil has the brown ( active ) wire  and the yellow (
neutral )  wire and it is the brown wire that goes to the side of the
start motor coil  with the exposed solder terminal  and this  wire
always has the live AC active signal  on it  even when the organ is
switched off and I got a nasty electric shock when I accidentally
touched the exposed  solder terminal with the AC active signal on it
whilst the organ was switched  off.  
 
I  assume that if the Hammond tone wheel generator organs were still in
production today , the strict modern  UL rules or the European Union
rules  would not allow  the  AC active signal  to always be present in
the organ whilst the organ is switched off.
For safety reasons  I think that it would have been better  if the start
switch and the run switch  were both double pole switches instead of the
stock  single pole switches so that the AC active signal and the AC
neutral signal would both be  completely switched out of the motor coils
and the AO28 preamp when  the organ was switched off. If the start and
run  switches of my C3 ever wear out and stop working I will replace
then with double pole switches and I would then do the appropriate
modification of  the wiring  in order to allow the double  pole switches
to work properly  with the start motor and the run motor.
All the best.
Kon