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Identification for onboard switch needed (Receiver Pioneer A-331)

Discussion in 'Electronic Repair' started by Jens Herrmann, Aug 6, 2013.

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  1. Hello,
    the source selection on the front panel of the Pioneer A-331 has 6
    switches of which 4 are temporary switches (source) and 2 are permanent
    switches (tape monitor). They have stopped working properly and I was
    not able to fix the problem with contact spray this time. Now I want to
    replace them but cannot identify the brand and model.

    Take a look at
    The footprint on the bottom side is a 2x6 dil -> 12 contact pins. Note
    that it is not possible to use a random model switch with the same
    footprint as there is a release mechanism which then would not work
    anymore. Thats why the blue knobs have the shape they have.

  2. Phil Allison

    Phil Allison Guest

    "Jens Herrmann"

    ** There is no sign of residue on the switches in the pic.

    So you used an evaporative contact spray like Freon or IPA.

    IME, usually only of short term benefit - if any at all.

    Try some WD40 or similar spray lubricant - seriously bet it makes all the
    switches work again.

    .... Phil
  3. Yes evaporative, but I had to open the switches to apply it.
    I would prefer to replace them as the switch mechanism inside did not
    look very well.

  4. Phil Allison

    Phil Allison Guest

    "Jens Herrmann"
    ** Silly, risky thing to do.

    WD40 works in seconds with no disassembly.

    ** You have NOTHING to lose by TRYING my suggestion.

    Been working near miracles for me, nearly every day, for 40+ years.

    .... Phil
  5. N_Cook

    N_Cook Guest

    Even robbing a salvaged one is problematic as the plastic body of those
    sort of switches can only take the bare minimum of soldering heat before
    they start to deform. Can you wire in switches to somewhere that has
    more space and can take more conventional switches , assuming you cannot
    find an exact replacement. I've burrowed inside similar switches and I
    would say they are next to impossible to rebuild, even if you can safely
    get them apart with their sub-mm parts
  6. Tim Schwartz

    Tim Schwartz Guest

    Have you tried contacting Pioneer's parts department in your area?

  7. Phil Allison

    Phil Allison Guest

    "Rheilly Phoull"
    ** If a squirt of WD40 does not restore good operation - nothing else

    But be very careful with linear faders as it can dissolve the grease that
    gives them a nice feel - if possible, open them up and clean the track and
    wipers with a rag and small brush dipped in WD40.
    ** Nonsense.

    .... Phil
  8. N_Cook

    N_Cook Guest

    going by what looks like broken pcb in that photo, then likely
    mechanical damage to the switch, chemicals will not remedy that
  9. Kalyan Ram

    Kalyan Ram Guest


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  10. Phil Allison

    Phil Allison Guest

    "Jeff Liebermann= IDIOT "
    ** Wrong.
    ** Yawnnnn...

    ..... Phil
  11. Phil Allison

    Phil Allison Guest

    ** ROTFL !!

    It kills cockroaches too.

    ..... Phil
  12. Phil Allison

    Phil Allison Guest

    ** I have a small ( 75ml) can of Caig "DeOxit D100" in the workshop -
    bought it a few years ago for a price about 10 times that of WD40.

    Dammed if I can find a single job it is any good for.

    It has almost no penetrating ability and is a poor grease solvent.


    .... Phil
  13. Geoff

    Geoff Guest

    What about CRC 5-56, how dya reckon it compares with WD-40?
  14. Phil Allison

    Phil Allison Guest


    ** You tell me - sunshine

    Almost 40 years ago, I used CRC 2-26 for the same jobs as WD40.

    ..... Phil
  15. Phil Allison

    Phil Allison Guest

    "dave the drongo "

    ** So WTF is it any good for ?

    ** I never use WD40 on electronics.

    Just mechanicals like pots, switches and connectors.

    Intermittents in ICs and other semis seem to be totally impervious to the

    .... Phil
  16. **Dismantle the switches and clean with De-Oxitâ„¢.
  17. Phil Allison

    Phil Allison Guest

    "Trevor Wilson"

    ** Stupid, wrong advice.

    De-Oxit = Cramolin = snake oil.

    ..... Phil
  18. "Phil Allison" wrote in message
    ** Stupid, wrong advice.
    ** De-Oxit = Cramolin = snake oil.

    You've obviously never used the stuff.

    I've been using it since the late '70s. The Red does a great job lifting the
    film from tin- and nickel-plated surfaces. The Gold does as nearly a good job
    on gold-plated surfaces.

    The 100% solution is not a lubricant. And I make no claims for its improving
    sound quality.
  19. **Try using the stuff sometime. It does what it is claimed to do.
    Naturally, the spray stuff is useless, but the type that you paint on,
    leave for a few minutes and wipe off works very well indeed. Switches I
    treated many years ago have long outlasted new replacements.
  20. Phil Allison

    Phil Allison Guest

    "William Sommerwanker Nut Case"

    ** Only nut cases use it.

    ** You've been a nut case much longer.

    ** Shame how it is fucking useless at fixing noisy pots and switches.

    ** The stuff does NOT do what WD40, CRC 2-26 and a host other similar
    fluids do in seconds.

    It is not a grease solvent, not a lubricant and does not penetrate small
    gaps and flow.

    .... Phil
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