Boss BD-2 Bluesdriver doesn't work anymore

[Gokarna]

Hi everybody,

my old Boss BD-2 just failed. Plugged-In, the signal goes through when the pedal is off.
Pedal on, the LED lights up, but no sound. If I turn all 3 potis full up, I can hear e very quiet (distorted) sound.
Playing around with the Level- and Tone-pots, I can also realise the differents as it should be, when the pedal works straight.
I not sure regarding the Gain-poti, because I can only hear a sound, when Gain is full up.

Before the Bluedriver failed, the Gain-Poti made some crackling noise, when turned.

I have already resolderd and checked the 2 multibraid(s) connecting the pcb with the potentiometer and also measured the "Gain" double-poti.
The diode D2 looked kind of have becoming very hot (might have been be only dust/dirt), so I replaced it with a 1n4002.

Still no progress.

I only have a multimeter but no oszilloscop.

Any ideas what might be wrong ?

Thank you for any comments,

Best regards

Gokarna

[Jazz P Bass]

Not a simple circuit.

You need to use a meter set to read Vac.

Hit a note on the guitar & see if you have any signal on VR2.
If it is there, then check the output pin (7) of the opamp.
If it is not there, then install a new IC.

The Free Information Society - Boss BD2 Electronic Circuit Schematic

[Gokarna]

Thank you for this instruction, Jazz P Bass .

The IC was definetly faulty, I changed it and tested again. There was more sound, but still not very good.
So I changed C10, D1 and D3 and also both multibraids.

Now it works perfectly again !!

Best regards

Gokarna