Originally Posted by
Reschs
Definitely check for dry joints on the relay.
When in fault mode check the voltage across the relay coil so you know if the protection circuit is activated. Most activate the relay to connect the speakers, so no voltage on the coil equals no output.
Check the DC offset voltage at the speaker output of each channel before the relay.
It should not exceed +/- 100mv. If this is OK, do you have access to a CRO ? If so look for excessive noise on the output which will trigger the protection.
Without the circuit I am guessing.
Some circuits sense the DC offset via a series resistor from the speaker output and use a capacitor to remove the signal. This capacitor drops in capacitance over time and can cause this problem.
Stupid question, have you lubricated all the pots. (volume, bass, treble & balance).
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