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Scruffie wrote:

Dr Satan wrote:http://www.hobby-hour.com/electronics/s ... ematic.php Q6 and Q7 create the flip flop and Q3 is the bypass.

Q3 is a filter, Q9 is bypass.

Guessing as the LED isn't coming on but clean signal is passing it's Q6 and/or 7 that have failed.

Yep, Q9. I'm gonna go finish my coffee now.

I had similar issue with a Boss DD-2, I found the diode that protects the circuit against adapter reverse polarity connections was burnt. Look at D7 on the schematic.