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I recently purchased a Laney Lionheart L20 410, and although it has great natural tone, the eq section is not functiong. Neither the bass, middle or treble are responding. It is not affecting the signal negatively, so I thought the ground may have been lifted somehow. A quick test proved that it was effectively grounded. All connections seem to fine and continual. Judging by the schematic, where are some areas I can investigate that would prevent the tone controls from responding while not affecting the signal
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What did you test? If you checked from the lower end leg of the MID pot to ground, that checks the wires, but it doens;t check the pot. Dial the wiper down to the ground end and measure from the wiper leg to ground. It should show continuity or whatever low resistance the pot has at all the way down. Does it? And then check the mid pot element for open. Is the bass pot open?Education is what you're left with after you have forgotten what you have learned. -
Good call Enzo. The mid pot was open. Im thinkin now I would rather sub in a fixed mid resistor instead of trying to find a small bodied pot like this one. How would I wire in a fixed resistor?Comment
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If you want it like the pot was mix or min, then replace it with a 22k resistor from one end to the other. The jump the wiper lead to either end depending if you want all on or all off.
But how large are the pots? The parts list calls them 6mm, but that is less than 1/4", and that doesn;t sound right. Oh wait, they refers to the shaft. Are these just 16mm round pots? Wouldn;t a 20k for a Marshall work?Education is what you're left with after you have forgotten what you have learned.Comment
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