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Old 23rd July 2012, 06:26 PM   #11
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I can not seem to locate these suface mount transistors anywhere on the internet. Could someone lead me in the right direction. I have traced input signal to these. Using my better judgement and without a schematic I am guessing that this is the pre-amp. There is no signal past these. Not really sure. But Also not real sure why this would keep both channels from working. can't find anything wrong with the other side. The emitter resistors check out on both channels.
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Last edited by oldguyoklahoma; 23rd July 2012 at 06:34 PM.
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Old 23rd July 2012, 08:14 PM   #12
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The SMD Code Book

MMBTA06 and MMBTA56.
http://datasheet.octopart.com/MMBTA0...et-8326744.pdf
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Old 23rd July 2012, 11:52 PM   #13
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Thanks Perry. I havent delt with SMD. I went back to that amp and powered it back up and found that I have power on the base and emiter legs as well as the collector. And this is on all drivers. uuggh....
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Old 25th July 2012, 02:27 AM   #14
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You should have voltage but it shouldn't be full rail voltage on all terminals of all components. Compare the voltage on the various components of the defective channel to the other channel.
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Old 1st August 2012, 04:29 AM   #15
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replaced all power trans on right channel, now no voltage on the speaker terminals. still no sound on both.
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Old 1st August 2012, 07:57 AM   #16
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'Power transistors' are typically those mounted to the heatsink. Did you replace any others?

Are you getting rail voltage to the output transistors?
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