PC ENGINE DUO audio issues

[vougbour]

Hello all,

a mate of mine sent me a DUO with audio issues.  it has had all the capacitors replaced a while back, however it seems like some audio channels are missing.

i didn't notice it at first, but was very obvious when compared to a duo-r.

made a video of the problem console and a DUO-R

my next step is to inspect the board, and pay close attention to the OP AMPS.  i do have some new TL072c OP amps, does anyone know if they are compatible? 

Thanks

Mal

[vougbour]

sound issues have been resolved.

lifted the OP AMP and cleaned underneath with IPA and fiberglass pen.  replaced OP AMP with new ones.  and replaced the two 10uf capacitors. 

now all is working perfectly.

cheers