If it is OK then something is dragging Vref down. The 5V1 zener is most likely OK but if you do lift one of its leads from the circuit the zener will probably test OK as a diode - but it is worth doing just to be certain. Ohms Law is quite useful but it does not really provide the answer to the pedal's problem. Replace the battery anyway and see if it helps.ΔΆ32R is actually what I was expecting if the 10K resistor was OK. It may be developing a fault or its battery is going low. If it is less than 1K then the zener make be faulty or the 47nF capacitor may be faulty. If it is 10K and is OK check the resistance across the 5V1 zener - the measured resistance should be greater than 1K. ![]() Then remove power and try to test the resistance of the 10K resistor (in circuit it will read anywhere between 3K to 8K - best to take it out of circuit to test ). Check that one end of the 10K resistor is connected to 9V then check the voltage on the other end ( I think that you have indicated that you are reading 0.11V or 0.20V ). The Vref rail may be being pulled down by something else or is not being supplied with voltage. At least the tantalum is not causing the problem. ![]() The two leads of the tantalum are not shorted. I removed the tantalum cap, and still nothing change.
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