The power switch might begin to fail in Marshall guitar amps that have undergone consistently heavy use. Whether the amp has been used for long days on the road, or is simply worn from the constant on and off of daily practice, the switch occasionally requires replacement. Replacing a Marshall amp's power switch is typically a job that does not require an expensive visit to your local guitar shop.
- Skill level:
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Things you need
- Replacement toggle switch
- Soldering iron, 25 watts
- 60-40 rosin-core solder
- Needle nose pliers
- Philips screwdriver
- Flathead screwdriver
Remove the control face of the amp using a screwdriver. Make sure the amp is not plugged into a power outlet, and that the power switch is turned off. The control face of the amp is the main bar where the control knobs are located.
Locate the old power switch. Remove the wires clipped to the back by sliding them off of the terminals on the switch; use your needle nose pliers. As many as five wire-connections may exist, depending on the model of your Marshall amp.
Slide a flathead screwdriver under the two retention-clips holding the switch in place. Release the switch from the front of the control face.
Clip the replacement switch in place by sliding it into the power slot from the front of the control face. The clips will "click" when the switch is seated correctly.
Replace the wire terminals on the back of the new switch in the same order as the old one. Solder any of the terminal wires as is necessary. Allow the wires to cool before touching or moving them.
Replace the control face on the front of the amp by reinstalling the mounting screws. Plug in the amp, and test the switch.
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