Question about MXR Phase 90 Pedal
This is likely a problem very near the power input connector. It could be a blown filter cap (electrolytic) or a shorted protection diode. You can troubleshoot this with only an ohmmeter.
A broken power input connector could also be causing a short.
Often the input audio connector is used to switch the power on so trace the power circuitry looking for the problem.
Suggestion test seperate from other pedals. Be careful to not burn out your power supply during testing... we put a lamp in series with teh 120 volts to the power supply to limit current to a safe value while troubleshooting.
Posted on Aug 09, 2010
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Posted on Jan 02, 2017
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