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Renovating gang switches

Discussion in 'Electronic Repair' started by N_Cook, Mar 6, 2013.

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  1. N_Cook

    N_Cook Guest

    Confronted with a huge Rotel amp from mid 1970s.
    Function switch, interlinked S/R ganged switch, 5 gang, each of 4 pole 2 way
    with pins extending above and below and a pcb above and below . One failed
    switch contact. I'm surprised I've never had to break into one before,
    serious miultiway radio waveband switches , yes, but they are not ganged.
    This make of logo TMS in an elipse, hopefully applicable to other makes of
    ganged switches.
    How to get inside without desoldering all that lot.
    U channel steel between the 5 gangs has 4 nibs , bent over, to trap each
    gang , bend back those 4 and the next 4 along the gang strip to give some
    lee-way. Small blade between that channel and the sw body to lever and give
    enough gap to release the S/R interlink that runs inside the U channel , and
    in this one release a nylon limit widget , from under the spring and then
    the core of the gang simply slides out. In this case aged/compacted grease
    had wedged the phosphor-bronze contact away from ever making contact
     
  2. Smarty

    Smarty Guest

    Spray with DeOxyIt !!
     
  3. N_Cook

    N_Cook Guest

    I tried opening a more recent ALPS multi-gang switch, laying around, with
    pins emerging top
    and bottom. Much the same routine to extract the core , no ball bearings or
    anything other than the contacts are likely to drop out. Easier to
    reassemble than those long radio waveband switches, laty the innermost pair
    of contacts in their wells, push in, then add the next pair and push in.
     
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