Avt 100 Four Button Foot Switch Fault

Discussion in 'Introduce Yourself' started by Kevin Whittle, Mar 31, 2019.

  1. Kevin Whittle

    Kevin Whittle New Member

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    Hi guys
    Please help!
    My pedal works individually but when on the clean channel if I try to go from clean to OD 1 nothing happens. However if I press clean first then OD1 it switches. Or if I press clean and OD1 at the same time it switches. I can not go from clean to OD2. But once OD1 is made I can then switch between OD1 and OD2 no problem. I can go back to clean but once in clean the problem starts again. FX works as it should. The amp buttons all work ok so fault is somewhere in the pedal. All LEDs light up when the channel is activated. I have looked inside and all the wiring is intact. Only the clean relay has a capacitor wired to it.
    Any help or a wiring diagram will be very welcome
    Cheers
     
  2. Jon C

    Jon C Well-Known Member

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    How many conductors are there in the cable for the 4 button Footswitch ?
    If there is less than 5 then you have an IC Multiplex
     
    Last edited: Mar 31, 2019
  3. stringtree

    stringtree Well-Known Member

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    :welcome:to the forum! :dude:

    Sometimes an amp needs to be set on a certain channel for it to work properly. I don't know if this is true for your amp but worth a try.

    Unplug the footswitch and set the amp on the first channel, then plug in the footswitch. See if this helps.

    If it doesn't, be patient, and I am sure there are those that know more will help.
     
    Mitchell Pearrow likes this.
  4. Trident

    Trident Well-Known Member

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  5. Mitchell Pearrow

    Mitchell Pearrow Well-Known Member

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    :welcome:To the amazing Marshall forum, where no question goes un answered, I cannot answer your question but be patient there are others here who can/ and will! Cheers Mitch
     
    stringtree likes this.
  6. Wooferhead1

    Wooferhead1 Well-Known Member

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    Welcome!:hbang:
     
    stringtree likes this.
  7. Micky

    Micky Well-Known Member VIP Member

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    Greetings!
     
  8. Kevin Whittle

    Kevin Whittle New Member

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    Thanks guys
    I’ll try string trees suggestion and come back to you.
     
  9. Kevin Whittle

    Kevin Whittle New Member

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    Hi Jon
    Sorry but I don’t understand you question
     
  10. Kevin Whittle

    Kevin Whittle New Member

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    No, makes no difference where the amp is switched before connecting the foot pedal.

    The cable is a 15 pin socket each end.
     
  11. Jon C

    Jon C Well-Known Member

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    Get a multimeter out and set it to 200vdc …… map out the pins and check everything until you find the common ground and note the voltages on all of the pins as you test …… you may find that you actually discover what does what as you test …… start there and let us know what you find …… BTW ……you do not have a Multiplex IC Switcher
     
  12. Dogs of Doom

    Dogs of Doom Moderator Staff Member

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