Author Topic: W.E. Model 500 P  (Read 4272 times)

Offline Kenny C

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W.E. Model 500 P
« on: March 05, 2011, 02:52:53 AM »
Colorful Wiring for a Model 500 P "Mushroom"
« Last Edit: January 05, 2013, 01:29:42 PM by DavePEI »
In memory of
  Marie B.
1926-2010

Offline HarrySmith

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Re: W.E. Model 500 P
« Reply #1 on: March 05, 2011, 08:51:49 AM »
Is'nt there something missing? The hookswitch?
Harry Smith
ATCA 4434
TCI

"There is no try,
there is only
do or do not"

Offline GG

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Re: W.E. Model 500 P
« Reply #2 on: March 06, 2011, 12:58:59 PM »


It's pretty obvious that Kenny was trying to depict the removable components: dial, handset, and ringer.  On a 425-B network, the hookswitch wiring is soldered into place and can't be removed; the C terminal is solder-only, no screw (and isn't depicted in Kenny's diagram).   On a 425-E network, C is a screw terminal but the hookswitch is riveted to the base so it's moot. 

Kenny, that's an excellent diagram including good depictions of striped wires such (the red/slate on the ringer); what software are you using to do those diagrams?  (And what operating system does it run under; I have "all three" so it's just a matter of which computer to use.)

Offline bingster

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Re: W.E. Model 500 P
« Reply #3 on: March 06, 2011, 11:42:21 PM »
Agreed, but on a P/U, the positioning of two of the switch wires on the terminal board is critical information.
= DARRIN =



Offline Kenny C

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Re: W.E. Model 500 P
« Reply #4 on: March 07, 2011, 08:54:21 AM »
This is for a P but it could also be for a U if anyone could PM me where the switch wires went.
Thanks,
Kenny C.
In memory of
  Marie B.
1926-2010

Offline JorgeAmely

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Re: W.E. Model 500 P
« Reply #5 on: March 07, 2011, 11:09:21 AM »
Kenny:

I think there is something missing in the schematic. I don't see how the bulb come light up without an extra wire (4 and E1) on the terminal strip.
Jorge

Offline HarrySmith

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Re: W.E. Model 500 P
« Reply #6 on: March 07, 2011, 01:03:06 PM »
Thats what I was referring to. I believe the switchhook is what controls the light.
Harry Smith
ATCA 4434
TCI

"There is no try,
there is only
do or do not"

Offline bingster

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Re: W.E. Model 500 P
« Reply #7 on: March 11, 2011, 10:18:01 AM »
It is.  There's an extra set of switches in the pileup that controls the lights in both the P and the U.  Those switches add two conductors to the strip.  The U also has a key, of course, which introduces yet another pair of conductors to the mix.
= DARRIN =



Offline paul-f

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Re: W.E. Model 500 P
« Reply #8 on: March 11, 2011, 07:24:13 PM »
The details can be found in the BSPs.

Go to the TCI Library and search for 500P, then search for 500U.
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Offline Adam

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Re: W.E. Model 500 P
« Reply #9 on: March 11, 2011, 08:04:43 PM »
You know, I never realized that the 500P and the 500U have an extra set of switch hook contacts.  (This is confirmed in the 500P and 500U BSPs).

I consider that strange, because that's a switch hook configuration found in no other 500 set, and they didn't use that switch hook configuration in the 500 L/M, which is wired for A-Lead control, basically by reusing one of the contacts in the switch hook normally used to switch the Tip and Ring (leaving only 1 lead switched, which is sufficient, of course, to put the phone on-hook).

Why didn't WE use the enhanced switch hook of the 500P and the 500U in the 500 L/M? Or, why didn't they design the 500P and the 500U like the 500 L/M, simply reusing one the contacts in the switch hook normally used for the Tip and Ring?

Is it possible the enhanced switch hook of the 500P and 500U was more expensive and/or lead to unforeseen problems in use and this lead to the early demise of the 500P and the 500U?
Adam Forrest
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Offline paul-f

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Re: W.E. Model 500 P
« Reply #10 on: March 12, 2011, 12:06:02 AM »
The history of the 500 H, P and U sets is summarized in "Dialing in the Dark" (Singing Wires, August 2009).

A key consideration causing the creation of the 500P was: "Due to its wiring arrangement, the 500H cannot be used as tip party on message rate, automatic ticketing, automatic message accounting or zone restriction services. (BSP C32.535, Issue 4, May 1954)"

It would be worth checking to see whether the 500M switch is like the 500H or 500P switch.
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