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Roland Cube 30x, 2008

Discussion in 'Electronic Repair' started by N_Cook, Jul 3, 2011.

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  1. N_Cook

    N_Cook Guest

    Phones/rec out socket. It is implied in the user manual but can anyone
    verify from experience, more exact details.
    1/4 inch socket with 2 isolated switch actions (Jalco). For phones, ie
    stereo plug, the speaker is fully muted, via control logic , not carrying
    For rec out , mono plug (explicitly stated in the user manual), then speaker
    is attenuated, by a fixed amount ?, but not muted like the stereo plug
  2. N_Cook

    N_Cook Guest

    The innermost "phones" switch does pass the speaker current, the outer one
    goes via 1K to somewhere. So the mystery deepens.
    Previous cube, different model "30 bass", triggering the outermost switch
    only , by plastic rod inserted thru the sw , dropped the speaker volume to
    10 percent or so of whatever the volume was set at.
  3. N_Cook

    N_Cook Guest

    Service manual on elektrotanya just describes the test function. Triggering
    one phones socket sw, triggered in isolation, cuts the speaker ; the other
    ,triggered in isolation, attenuates marginally from eg 1.58V ac over speaker
    to 1.2 V . But in normal use , the speaker cut sw takes precedence and both
    stereo and mono jacks cut the speaker.
    Now I've replaced the socket, foreign object landed insid and then rear of
    the Jalco got mangled and pushed out
  4. Meat Plow

    Meat Plow Guest

    I've seen that several times. (broken jalco backside)
  5. N_Cook

    N_Cook Guest

    Just 2x mm-size plastic pawls hold the white rear in the black body. Maplin
    and RS no longer stock them , I wonder why - I gave up hunting for uk
    supplier. Standard 1/4 in stereo socket melded to 2 ultra-miniature spdt
    microswitches is now in there, far more robust.
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