Question about Lasonic TRC-931 Cassette Boombox
I have problem with my Pioneer SA 9800 as 2SC 2525 & 2SA 1075 going off frequently. Has changed it twice. unable to trace fault. I am told that there is a proble with protection circuit.
I assume these are the complimentary pair that drive the speakers. On one of the speaker. You know I think you have a short in the speaker that it drives. Speaker can fuction even if there was a problem with it. I think what happened is when the original transistors shorted out it overloaded the speaker, but not to a point where it is burnt. There is nothing that can overload a power transistor except the speakers, I design a lot of amplifiers, the base input can overload it if you put dc in there, but that would make a the sound all distorted, I assume the sound seem fine. Solution is try connecting a known good speaker and I bet it wont burn out anymore. Even if the speaker look fine don't trust it.
Posted on Jun 30, 2009
Change your differential transistors in the front end of the power amplifer board,most likely your speaker output 0v is flucturating causing the protection circuit to kick in thus switching off your speakers intermittently.
get a qualified tech help.
Posted on Aug 24, 2009
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Posted on Jan 02, 2017
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