Digitech Whammy V Volume Drop when switch on

[Fazzi]

Hi guys. I need a help troubleshooting my Whammy V.

When switch it on, the volume drops a lot. All effects works fine, but always with low volume output.

I took the pedal out my pedalboard, tried the original power supply, oppened it up, looked up for dry or broken soldering and still nothing.

Seems to be a very common problem on Whammy pedals, but I did'nt find any info about it.

Have you seen this problem before?