Well, the party was a blast. Even with one speaker volume was more than enough to get people dancing... 

I found the schematic so think I can fix it. I suspect the power amp is blown.... it's a stk4301 ic. Hope I will find a cheap replacement, I really start to love this radio.. it's so extreme in everyway..

If somebody needs it, the service manual for the Sharp HK-9000 is now online at:

http://www.freeservicemanuals.info/

Just search for HK-9000.....

Many thanks to the site owner Wil for sharing it! 

The new power-amp has arrived! Its much bigger than expected! This baby looks mean!...

Hope it will solve the problem... Later I saw there are some fusible resistors near it. So it could be one of them also.... Well, that's the risk of skipping the measurement thing, I guess...

Okay, the box is booming again.... Needed 6 hours to find out what was wrong with it. Pffff.... Changed the big insect, but it wasn't him. Finally found a broken diode...

And because you all like picturesss....

And because it was open anyway, I added a charge plug in the back for the 10 rechargeable D-cells... Really hate to get them in en out every time....

sir michiel can u tell me how many voltages and amp for power supply transformer, i wanna replace it, thanks