Hello, I have a problem with this amplifier. It's stuck in the protect. Everything's been repaired, and there are no more problems. If I remove the Q50 transistor (A1266), it runs smoothly and nothing heats up. So I suspect there's a fault in the protection circuit. I've already replaced the TL494 and LM293N just in case, and then it ran for about 15 minutes. Suddenly, it started cycling on and off three times, and then it got stuck in the circuit breaker again.
I need help, please.
I need help, please.
You don't need to read the diagram. Just look around to see of the various components have common connections on the board.
Look at the 4 transistors near ther power and ground terminals. I think Q226 corresponds to one of those. The circuit board designations are different but the connections are likely the same.
Find the PNP transistor that connects to a diode via a 4.7 ohm resistor.
Find the PNP transistor that connects to a diode via a 4.7 ohm resistor.
That would be Q1. I already tested this during troubleshooting and replaced it as a precaution. No changes. the diode and the resistor are also OK Is it true that an A1266 is also installed at Q1? This amplifier has already seen several people working on it.
I just noticed that if I lift the diode on one side at Q1 the amplifier runs but after 5 minutes it goes back into the protect