Solton Polyvox Vintage Synthesizer Drum Machine. Besides from surface rust and a smell of moisture, most PCBs inside the Solton were loose from shipping.
I also noticed very quickly, that it had a serious battery damage.
The battery damage was so heavy, that components fell into pieces without really touching them.
After, cleaning and replacing a lot of components, new capacitors, new battery etc. the Solton Polyvox Vintage Synthesizer Drum Machine came back to life. Since I had no service notes I took a lot of pictures for my own purpose. You can find all detailed content/pictures at my patreon.