Boss OD-2. LED issues.

[ziggy007]

Embarrassed to admit this pedal is beating me atm
Pedal ops ok.
Led only works on battery. Nothing on boss pwr adapter. If I provide an earth to the led at r53 it glows bright. If I Bypass D1 and r2 (ie pin 5 to ground) led bright. (Replaced both)
At a loss. I’m sure the issue is staring me in the face!
Cheers Gav

[Enzo]

schematic?

[The Dude]

Do you have something plugged into the input jack? The ground is completed by the jack shorting ring to sleeve when a plug is inserted.

Schematic here:
https://www.hobby-hour.com/electroni...-schematic.gif

[ziggy007]

[ziggy007]

Yep,there's a jack in the input. all its grounds checked ok The pedal works fine. its just the LED. LED works fine on Battery.

[The Dude]

D1 and R2 are good?

[ziggy007]

Removed and Tested good. substituted both no diff.

[g1]

Some boss pedals the led won't work on adapter if it's not the specified boss adapter. Does it call for the PSA or ???

[g1]

Here's the info: https://music-electronics-forum.com/...l=1#post512364

[ziggy007]

G1,
You sir are a legend.
Thanks
I thought I was going mad. Certainly done my duds on this job, but have learnt something, so happy!
Cheers mate
Gav

[g1]

Glad to be of help. Fortunately, it was one we had just discussed recently, so I could still recall it.