![]() #ALTEC LANSING ATP3 SPEAKERS ONLY DOWNLOAD# Most importantly, I checked for shorts/low resistances between each of the four outputs of TDA7377 and GND. The resistance between 12V and GND was more than a k-ohm. Similar checks on other ICs also revealed an apparently healthy condition. I therefore proceeded to check the board by connecting a 12V battery. There was neither any sound nor power ‘ON’indication. I had to therefore trace at least parts of the circuit on the PCB to identify specific test points for identifying a fault. It was during this process that I discovered that the ‘Power ON’LED was connected by tapping the transformer secondary winding instead of the rectified DC. A separate diode was used to generate a half-wave rectified DC for the LED. I therefore connected the battery at the AC terminals of the diode bridge so that the battery could feed the LED too. The LED now lit up! As I moved the volume and tone controls, I could hear a faint crackle on the speakers, indicating that the board was working fine. #ALTEC LANSING ATP3 SPEAKERS ONLY DOWNLOAD#.
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