Good day bro , i am troubleshooting an ADS 1000DB mono amp, Chinese made amp that suddenly smoked , i found out that the 2 resistors as shown R32 and R33 got burned . R32 came in series from +D3 and goes directly to Pin 1(Vin)of KA7815 while R33 came in series from-D1 and goes directly to Pin 2(Vin) of KA7915. The regulators are Vsupply to TL0804. The diodes D3 and D1 other end connects directly to the transformer. Can you please help me of the values of the 2 resistors? they are totally burned & identifying the color codes is not possible. Thank you in advance.
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10 ohm resistors are commonly used before the regulators. What is the DC voltage across each of the burned resistors?
Make sure that the back of the regulator can't contact the shunt resistor behind it.
Make sure that the back of the regulator can't contact the shunt resistor behind it.
I am getting 20v across the resistors but they are open already. I will try to put 10 ohms and replace the regulators.Thank you bro. Update you after.
Good day bro. I replaced the 2 resistors with 10 ohm 1/2 watt and the KIA7915 and 7815 regulators also a ceramic caps of 100nf connected to the TL084 chips that got shorted. The ouput FETS are good, but for safety i removed them prior to powering the amp and yes blue is On and signals are present in the gate Hi and lo after then i fixed back the fets then fixed the board in the case , switch On and test audio. The mono amp is now in good condition and working. Thanks again Perry for the never ending support. More power bro.