AIWA HS-T70

I couldn't resist... When I saw it I wonder if this unit with Dsl and BBE is very far in terms of sound quality with my Aiwa HS-PL505. It was sold as non working. I've just received it, a high buzz sound when it opperates no matter radio or tape, I assume recaping is necessary. I try to collect the caps and change them. First pictures

 

I hope that acid haven't destroyed the circuits...

 

Yes, the buzz sound is caused by some amp stages oscillating. A full recap is necessary, but expect corrosion on the PCB also.

 

Ok, I think I'm not very lucky this time...

 

Is is worse than I expected, but it can be repaired with enough patience. From what I can see, some vias and traces are affected.

Here is the service manual: https://www.petervis.com/manuals/aiwa-hs-t60-and-hs-t70/hs-t60-and-hs-t70.html

 

Thanks a lot Valentin, I'm working on it, I have desoldered the caps sorrounded of corrosion and cleaned the pcb, after that, it looks much better, don't know if it is enough.

 

I know the proper way to recover the unit is to change all the caps, I need to collect them all, by now I'm evaluating the damage