[VoIP] Strowger 2000-type Final Selector

[Martin Harriss]

Mad Mark wrote:
> *** OFF LIST REPLY
> 
> 
> 
> Ok, looking at the switch as if it were in situ as if it were on the
> rack, if I turn it around so the contacts are facing me (not flipping
> it upside down)... I don't think those contacts are connected. I'm
> reading complete open circuit. Confirm for me the contacts are -50v on
> 6th U-connector to the right, outside terminal, and GND on 6th
> U-connector to the left, outside terminal.
> 
> 
> I hope my ASCII comes out alright on your end. Hotmail does not have a fixed width font setting. But, is my understanding correct?
> 
> 1. 9. 7. 5. 3. 1. i .2 .4 .6 .8 .0 .2
> || || || || || || i || || || || || ||

No, it's like this:

  21   17   13   9    5    1    2    6   10   14    18    22 

23  19   15   11    7    3       4    8    12   16    20    24
||   ||   ||   ||   ||   ||  i  ||   ||   ||   ||    ||    ||

i.e. each 'blade' has two sides and consists of two contacts with an 
insulating piece in between.  (Hopefully the diagram won't get mushed in 
transmission.)

You might also find this useful: many selectors were wired with only 
three colours of wire: white for battery (-50v,) red for earth and green 
for everything else.  If this is the case for your selector, if you can 
find the red and white wires to the shelf jack, this will tell you where 
to put the power.  Indeed, if you can find the red and white wires 
somewhere on the relay plate, you can apply the appropriate voltage with 
clip leads.  Manually operting the A relay should then bring the thing 
to life.

Martin