Jeez, this 34 is fighting me all the way!
Sorted the input switching out (logic chip fried).
Testing the audio path tonight - no output both channels.
Traced it to the tape monitor logic gate, its also fried because if I short the signal path through it, signal gets as far as the output mute circuit ... where it stops
Output mute circuit is not switching out of mute even when the PSU is stable... I suspect a leaky transistor after the comparator. I'll sort the tape monitor logic out first (parts on order) and then think about the mute circuit!
Still, at least it should be ready for the hifi selling season!!
Decided to sell on the FM4 as 'spares only'. In technical terms, it's whats known as f*cked. When I started investigating it, the battery leak has dissolved most of the tracks within a few inches of it, including the tracks near the processor. Shame. I always wanted an FM4...
"Two very small men cutting steps in the roof of the world"