I bought a (new) Boss DD-3 pedal. It only works when Mode switch is in 'L' (200-800 mS) and in 'Hold'. In 'M' and 'S' position I get no delay effect. Funny thing is, I have the exact same problem with an older (2nd hand) DD-2. Anyone recognize this problem? Help appreciated! Haye (Amsterdam)
I've seen this before a couple of times and it usually has one of several causes - incorrect voltage is the most common. Have you tried it on a known good battery? If you are using a power supply and it isn't a Boss PSA you will have problems guaranteed.
Other possibilities are the on/off switch has failed, or the mode switch has failed.
Thx a lot, guys. Bought it in the US, only to find it was failing after I came back home Used a new battery (came with one), but will try the Boss adapter as well. Thx again, Haye