Sony STR-313L

1. Tuner not soldered in correctly - no AM!
   
2. Tuner cogwheel assembly had no backlash tension
   
3. Channel control transistors soldered in the wrong way
   
4. Tuning photo-detectors failing
   
5. stereo mpx mis-adjusted
   
6. stereo lamp blown (replaced by zener+led)
   
7. very very dirty - nicotine cleaned off with alcohol
   

The Sony 1978-1979 Sony Hi-Fi program brochure

Pictures

PICT0022 (372.7kB)

Schematics

STR 313L01 (732.4kB)