So today I've taken my dead boombox back from repair shop. The technician said that voltages are ok and he said that a certain point doesn't work nothing anymore. He didn't wanted to open the case again, but he said that the fault is probably here:
The problem starts here were "power supply is written"
The rest is all ok, but the "?" is unknown, probably the tuner section.
Amp section is ok, the first power supply section is ok, but i don'T unserstand why he calls the tape motor section "power supply". The tape engines are working too. The only think which doesn't work are the vu meters, with no lights and movement too despite the bulb is ok, and the elaboration of every audio signal like radio, tape and line-in. When the fault occured, the box was set on line-in. probably its gone something after the line-in commutator?
Edit: About the vu meters, they are only connected to the "power supply". Or am i wrong?