Together with my radio friends Theo PA0KN and Edwin PA2LVD we saved a TS-780DX from scratch.
The Sommerkamp arrived from Belgium some weeks ago and had a few 🙃 flaws:
No audio on receive
No receive at all
No SSB transmit
Fault at 7 segment LED
Oscillating of PA after pressing ptt
Some knobs not original
Case scratched and damaged.
We spend some time to fix these issues but after replacing the audio IC, a voltage regulator and zener diode, balance modulator, remove a short circuit in the IF part, repair cold joint at LED driver, put the PA in class A and perform some adjustments the transceiver came to live again!
Enclosure was also repainted and original knobs where placed.
Very nice to have a working 40 year old Sommerkamp saved from scrap!
The result (and yes it works on 10 meter band)