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Old 6th October 2011, 03:31 AM   #1
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Default RF T3002 ..two burnt ch

Two of the channels are badly burnt.If anyone have the schematics please send it to me ranks33@hotmail.com
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Old 6th October 2011, 01:55 PM   #2
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https://sites.google.com/site/brande...edirects=0&d=1

It won't be much different than this one.
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Old 14th October 2011, 01:55 PM   #3
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I replace the burnt parts in both ch.now i am getting -27.6 volts on pin 4 of all opamps.Q13 -regulator is getting hot and Q14 is also getting hot.I replace Q13 with a used one but no change.any ideas what can cause that?
Q13
1:23.7v
2:33.5v
3:29.6v

Q114
1:31.5v
2:36.4v
331.9v
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Old 14th October 2011, 02:21 PM   #4
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Pull the regulators and verify the voltage on the op-amps goes away. I would then lift the supply pins on the op-amps and re-install the regulators. Check the voltage on the outputs +-15. If those seem ok, replace the op-amps. I don't believe those parts can take that much supply voltage.
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Old 14th October 2011, 05:33 PM   #5
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Location: Louisiana
Do you mean Q12 and Q13?

Those are the regulators.
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Old 17th October 2011, 03:25 PM   #6
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when i remove the regulators the amp thermal light comes on.

Q13 and Q114 used to get hot.

The amp has no rail voltage now.If i pull the center leg of the rectifires i get rail voltage on the center legs.All outputs are out of the amp right now.I dont no what to check now.Any idea?
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Old 17th October 2011, 10:01 PM   #7
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You've listed, Q13, Q14 and Q114. Are you dealing with 3 difference components or was the Q14/114 a typo? If so, which is correct?
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Old 18th October 2011, 01:07 AM   #8
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yes typo sorry it was Q13 and Q114 but now the amp have more problems like i said in post #6.I dont no where to start looking for the faults.
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Old 18th October 2011, 01:18 AM   #9
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I don't know what to expect if you remove the regulators. Are you referring to Q12 and Q13?
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Old 18th October 2011, 02:05 AM   #10
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yes
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