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Old 22nd January 2013, 07:37 PM   #541
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It was a bit of a marathon thread for sure
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Old 29th January 2013, 06:47 AM   #542
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My sony TA F6B amplifier is damaged. Transistor Q352 and resistor R362 are high temperature. Is The IC CX 171 broken, please advise me
My english is bad
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Old 29th January 2013, 08:22 AM   #543
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You would need to do a lot more tests. The IC might be unobtainable now which could be a problem.

Check the supplies to the IC

Check the two 0.22 ohm resistors on the output stage. If open circuit then you have an output problem.

Check the voltage across those two zeners near the IC.
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Old 29th January 2013, 10:48 AM   #544
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Originally Posted by Mooly View Post
You would need to do a lot more tests. The IC might be unobtainable now which could be a problem.

Check the supplies to the IC

Check the two 0.22 ohm resistors on the output stage. If open circuit then you have an output problem.

Check the voltage across those two zeners near the IC.
I replaced two zeners 22V, but the transistor Q352 and the resistor R 362 are alway very hot, The output stage is 49V, but two transistor output stage are good. Why?
I shall check the supplies to the IC, please show me how to check the IC
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Old 29th January 2013, 12:05 PM   #545
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Check the 8 and -8 volt rails on pins 4 and 14 of the IC.

Check that there is no DC voltage (<0.1DC) across the base and emitter junctions of Q355 and Q356.
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Old 29th January 2013, 02:02 PM   #546
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Check the 8 and -8 volt rails on pins 4 and 14 of the IC.

Check that there is no DC voltage (<0.1DC) across the base and emitter junctions of Q355 and Q356.
I am going to check Q355 , Q356, and report to you.
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Old 31st January 2013, 07:11 AM   #547
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Originally Posted by BANG PHI View Post
I am going to check Q355 , Q356, and report to you.
I replaced Q 355 ana Q 356 but the transsistorQ352 and resistor 362 are still very hot
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Old 31st January 2013, 07:32 AM   #548
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Did you check the voltage across the base and emitter junctions with the amp on as mentioned earlier ?

I didn't suspect those transistors as being faulty. The test was to see if they were turned on

tbh I think you are going stuggle with with this. Its a complex amp and the IC is an unknown as to whether its good or not. You could always swap the IC with the other channel and see if the fault transfers over.
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Old 1st February 2013, 09:31 AM   #549
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Why check the voltage across the base and emitter junctions Q352, Q353?
If there is DC voltages? Is the IC damaged?
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Old 1st February 2013, 02:31 PM   #550
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It would show if they were turned on and conducting. You have to measure across the junctions to get an accurate reading.

I don't know if the IC is damaged or not at this stage.
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