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help specing pushbutton switch please?

Discussion in 'Electronic Basics' started by dj, Apr 5, 2004.

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  1. dj

    dj Guest

    I'm trying to repair some intercom units in our apt. building and one
    has a broken pushbutton switch that's actuated by a handset
    switch-hook. It has twelve pins in two rows and behaves as follows
    (o---o = switch connection between pins):


    o o---o o o---o
    plunger out --->
    o o---o o o---o



    o o o---o o o
    plunger in <---
    o o o---o o o


    Is this a 4PDT or what? I need to find replacements and the dimensions
    are no problem but I don't know what I'm asking for.

    Many thanks for any help!
     
  2. Dbowey

    Dbowey Guest

    You are close. Here is 4PDT. It's a good idea to have some separation between
    units, for clarity.


    o o-->o o o-->o
    plunger out --->
    o o-->o o o-->o



    o<--o o o<--o o
    plunger in <---
    o<--o o o<--o o

    Don
     
  3. dj

    dj Guest

    You know, now that I look at my diagram, I think it has THREE
    positions, like so:

    o o---o o o---o
    plunger out --->
    o o---o o o---o



    o---o o o---o o
    plunger in halfway <---
    o---o o o---o o



    o o o---o o o
    plunger in completely <---
    o o o---o o o

    In fact, yes, that is the way it works, the halfway point is handset
    on-hook, the plunger out is handset off-hook, and plunger in works the
    "open the door" solenoid (it pushes in past the point of on-hook rest).
    And the wipers short two pins, skip two sets, then short another set.

    Any idea what would a switch like this would be called?
     
  4. CFoley1064

    CFoley1064 Guest

    Subject: Re: help specing pushbutton switch please?
    It would be called a custom switch. Manufacturers of switches will make just
    about anything the customer specifies, especially if the volume is there.

    I think your best shot for a repair would be to
    1) contact the manufacturer for a replacement,
    2) try to repair the switch, or
    3) scrounge a used switch from an identical piece of equipment somewhere. If
    you positively _have_ to get a solution, use a separate power supply, a SPDT
    ON-(OFF)-ON toggle switch, and a couple of 4PDT telecom relays to simulate the
    switch action.

    Good luck
    Chris
     
  5. dj

    dj Guest

    Any idea what would a switch like this would be called?
    Yes, when it got into the three-position category it started sounding
    non-standard. The switch action was making no sense to me when I
    thought it had only two positions. Thanks a lot for your help!
     
  6. Dbowey

    Dbowey Guest

    That is a 4P3T. it is common in rotary switches, but in a push-button switch
    you may need to write to switch manufacturers to find who makes one.

    Don
     
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