The Digitech Jimi Hendrix Experience pedal is a device that emulates some of the musician's most famous tones. Expression pedals are distinct from standard effects because you determine the parameters with a treadle. The pedal is connected to a potentiometer, which controls the flow of current throughout the circuit. Because there are moving parts, such pedals are typically more prone to faults than standard pedals. If your Jimi Hendrix Experience pedal isn't working to its optimum, you can save money on a replacement by carrying out some basic repairs yourself.
Swap out a brand new or a recently used 9-volt AC power supply to rule out a faulty one. If the pedal fails to turn on, even with a good power supply, this suggests the location of the problem is in the power supply.
Plug the pedal in, turn it on and rock the treadle as normal. If the position of the treadle doesn't influence the sound or volume level, depending on which setting you select, it may have become detached from the potentiometer.
Adjust the control dials at the top of the pedal. If they crackle when turned, this indicates that the connected potentiometers are dirty, or there is a loose connection at some point between the dial and potentiometer.
Select the "Model 1" button.
Press the treadle down with your heel for five seconds. The LED will flash green.
Press the treadle with your toe and hold it for five seconds. Repeat this process in "Model 2" and "Model 3" modes. This calibrates the pedal so the parameter limits are constant between modes. This will fix any issues linked to volume peaks and dips or inconsistent treadle function.
Place the pedal facedown on a work bench.
Unscrew the base plate to access the bottom of the circuit board.
Remove the screws on either side of the treadle with a Phillips head screwdriver. This detaches the treadle.
Turn the pedal over. Lift the treadle out of the pedal. Disconnect the gear strip from the potentiometer by hand.
Tighten the washer that attaches the inside of the balanced 1/4-inch jack to the inside of the chassis. Do this by turning the washer clockwise by hand. This secures the input and output connection.
Disconnect the solder joint that fuses the AC power wire to the circuit board. Trace the wire from the power supply jack to the board. Press a clean soldering iron tip against the joint and remove the wire.
Solder the wire back onto the board to create a new connection. This fixes any power supply problems caused by a loosely connected power cable.
Trace the wires from the back of the potentiometer to the board. If any of them are loose or disconnected, make a new solder joint connection. If there are no loose connections, the potentiometers are most likely dirty.
Spray plastic-safe contact cleaner onto the back of the potentiometers. This stops the dials from crackling when turned.
Opening up the pedal chassis may void your warranty.