Electrovibe no sound

[knappster]

This is my 2nd electrovibe. First one went perfectly. No issues.

This time no sound when engaged. Bypass sound works, LEDs light up. Click vibe and no sound. The bulb is lit but it's not pulsating...moving gain and bias brighten and dims. No pulsating tho.

Can someone explain to me like I'm 5 how to check things with a multimeter or what to check first. just kinda clueless now.

 

[knappster]

wondering if anyone knows which 4k7 resistor the LED is for the Vibe side. id like to make the LED dimmer. its way way too bright. EDIT- nvm . thanks again robert and all for the insight.