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What value is R76 on the Boss DD-20 GigaDelay pedal. Pedal doesn't power up and I am pretty sure this is the culprit as it measures direct short circuit and hence puts positive supply direct to ground. Thanks for any help. Kenda47

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More analysis is needed!!!

I have 50 years of electronics troubleshooting and I use the experience to isolate bad parts. I will tell you that resistors USUALLY open circuit 99.99% of the time and very very rarely do they short... I maybe have seen one do that in the last 50 years.

Most common shorts are semiconductors and electrolytic caps with other types of caps and diodes pulling up the rear.

The way you troubleshoot this is to use a current limited power supply OR put a resistor in series with a supply of correct voltage and DRIVE some current into the short... keep it around 500 ma.

Next do the finger test lookig for WARM parts.

Next use a sensitive milli-voltmeter to trace where the voltage goes to ground. The circuit traces have resistance and you can follow the current by following the voltage drop till you find the lowest voltage and you will find your bad part.

Posted on May 15, 2010

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Sounds like bad power. Just checking to make sure the voltage on the power supply matches is not enough. You need to make sure that the miliamps match AND that the polarity is correct. I had the same issue with my old DD-20.

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