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Old 28th June 2020, 03:56 AM   #1
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Default SWAN M50W sub woofer circuit

I have Swan M50w built in Amplifier with 120 w 8ohms sub woofer

Amplifier by tda7265 is working good with out sub woofer speaker

Sub woofer tda7294 has been replaced but worked only for few months.
Commone external digital volue control with press muting.
When switched on I get hum at Sub woofer and pin 2&6 spark observed and i get 42v at pin 14.
dual power supply rails +/-22v and +/- 32v are okay.

Iam basically Electrical Enigeer and Electronic hobbiyst.
and not doing repair business
tda7294 bootstrap cap-47 microfared 25v and 5 ohms resistor inseries with 104cap is connected between pin 14 & earth
22k resistor between pin2 &14 ,all as traced in the PCB
Kindly Suggest with guidelines to proceed further

Last edited by BALASUBRAMANIAN; 29th June 2020 at 05:59 AM.


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