Fixing power amplifiers from Technics company is always a pleasure because of theirs construction. This one, was brought to me with effects of unequal signal levels in channels and hoarseness sound on low volume level. After inspection and measurements, it turned out that its main pain was dirty and oxide connectors in number of switches and output relay. Cleaning in ultrasonic bath and mechanical performence brought state that can be seen on pictures. In some placesI also had to resolder pb-free solder junctions.
Oxided connectors:
Popękana cyna bezołowiowa:
Cleaned switches ready to be mounted back:
Filled missing part of relay case:
Schematic:
