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Old 1st June 2012, 02:46 AM   #1
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Default MTX Thunder TA92001

Hello guys again...

I repairing this amp because it has no sound. Protect and thermal light does not come ON, no rail high voltages( but just around less than +-20V). And I found there's a lit on SMT LED besides 3120 opto couplers. what does this mean?

thank you so much!
-Armand
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Old 1st June 2012, 02:58 AM   #2
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That LED (LED400) means that the mute delay has ended and the switching circuit for the output drive has been enabled. This is lit normally.
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Old 1st June 2012, 05:46 AM   #3
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Quote:
Originally Posted by Perry Babin View Post
That LED (LED400) means that the mute delay has ended and the switching circuit for the output drive has been enabled. This is lit normally.

any idea why I think it is muted? first IC(3120) on left most heated much. idea please?
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Old 1st June 2012, 06:01 AM   #4
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It should have much higher rail voltage. Are you sure that the power supply is operating properly?
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Old 3rd June 2012, 02:48 AM   #5
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Quote:
Originally Posted by Perry Babin View Post
It should have much higher rail voltage. Are you sure that the power supply is operating properly?
hello!!! rail voltages are +-20v only. PWM readings are these...

Do I have problem on pin 2? May I know what's the source of the protect?

1. 0.08
2. 0.09
3. 3.57
4. 1.037
5. 1.49
6. 3.36
7. 0.009
8. 13.37
9. 0.009
10. 0.004
11. 13.36
12. 13.76
13. 4.9
14. 4.9
15. 4.9
16. 0.005
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Old 4th June 2012, 04:18 AM   #6
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I would expect pin 2 to be higher.

It likely has a resistor (R106) connected between pin 2 and pin 14. If that's correct, confirm that that resistor is within tolerance and that there are no bad solder connections on it.

Also post the resistance from pin 2 to pin 7 (no power applied).
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Old 5th June 2012, 01:28 AM   #7
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Quote:
Originally Posted by Perry Babin View Post
I would expect pin 2 to be higher.

It likely has a resistor (R106) connected between pin 2 and pin 14. If that's correct, confirm that that resistor is within tolerance and that there are no bad solder connections on it.

Also post the resistance from pin 2 to pin 7 (no power applied).

You got it Perry! defective resistor R106. thank you! It powered now :-)

May I know what is the capacitance value of C410/C411? I burnt it:-(

Thanks again!
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Old 5th June 2012, 02:52 AM   #8
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I don't have the value for those. MTX will give you the values. I'd guess that they're 0.1uf@50v but confirm. I'm assuming that they're connected to pins 5 and 8 of the opto-couplers.
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Old 5th June 2012, 03:53 AM   #9
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Quote:
Originally Posted by Perry Babin View Post
I don't have the value for those. MTX will give you the values. I'd guess that they're 0.1uf@50v but confirm. I'm assuming that they're connected to pins 5 and 8 of the opto-couplers.
Yes they are connected. Thank you so much! this became a head ache to me, I sold this amp for just $250 but returned by the owner for repair.
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Old 29th June 2012, 02:09 AM   #10
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Quote:
Originally Posted by nonprof View Post
You got it Perry! defective resistor R106. thank you! It powered now :-)

May I know what is the capacitance value of C410/C411? I burnt it:-(

Thanks again!

Hello!

May I know what is the resistor value of R106? And kindly provide me the value of the +- power supply electrolytic capacitors for 8-pins DIP output FET driver?
Maybe other engineer partially replaced this capacitor for isolation purposes but forgot to replace with the original.

thanks!!!
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