My wife's AIWA shelftop system died the other day and of course I took it apart to see what was wrong.
It appears to me that all circuits are working correctly, except the NEC UPD780226GF IC which is essentially an 8-bit microcomputer with a 78K ROM.
Now if I ordered this chip from NEC I would still have to flash the ROM with the AIWA control code for that model correct? So ordering the CPU is going to do nothing. I've downloaded a data sheet which also states the package comes with an in-circuit debugger, a C compiler, an assembler, linker, and librarian.
But even though I could figure out how to program the beastie, I do not know what the AIWA system expects to see.
So I guess I'm out 150 bucks eh? Seems I could probably do embedded C and assembly for these types of devices with little or no trouble at all. Maybe I'm in the wrong biz.