Case #543645/ 09.12.2022 Luxman L-100 amplifier. Low sound from both channels.
Switch MODE/LEFT/RIGHT replacement solved the problem.
Year: 2022
Case #456718. Technics SU-7600 amplifier repair. No sound.
Case #456718. Technics SU-7600 amplifier repair. No sound.
06.11.2022. No sound on both channels.
Pilot light is ON.
Voltage -35 volt and +35 volt from power supply are present. All output transistors are ok.
Relay control transistor TR354 ( 2sc828a) replacement solved the problem.
Sansui C-77 pre-amplifier repair. Case # 356465
Case #356465. Sansui C-77 preamplifier repair.
Different output signal level in left and right channel . Unbalanced output signal .
Repair.
Changing double front pot 100k ohm ” volume” solved the problem.
Cleaning did not helped.
One of them for some reason changed value to 60K ohm.