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Old 20th April 2013, 04:46 AM   #41
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Join Date: Dec 2012

i can't find the carrier signal.. cant find it with my scope. I was troubleshooting the lm6361n and powered it with it removed and now i have lost the carrier triangle wave. I even looked for it at the LM6172. Where is the origin of the carrier signal generated?
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Old 20th April 2013, 07:40 AM   #42
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Location: Washington State
Is the LM6361N installed now?

Do you have the schematic?
Pyramid 52 Amp Power Supply----Fluke 787 Processmeter----Tektronix 465 Scope----Velleman HPS40 Scope----Soldering Iron----Desoldering Iron----Hejet HJ 500-S Heatgun----DM4070 Digital LCR Meter----Propane Torch
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Old 21st April 2013, 12:46 AM   #43
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Location: Louisiana
Pin 7 of U11 should have essentially 0v DC and have a triangle waveform.
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Old 21st April 2013, 02:38 PM   #44
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Perry and Sean,

sorry for the delay...yesterday i had no carrier wave on pin 7. i just removed one from a parts amp and installed it and now i am making some headway. I have my carrier waveform. Yesterday i had 8v on pin 7.

Now that i have my carrier waveform the mic4420 has a nice square wave on the outputs of both. I also have the correct waveforms now on both the railswitchers and the audio outputs. I have about 12volts on the speaker outputs still.

I have a few things left to check and hopefully have this one wrapped up.
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Old 21st April 2013, 08:04 PM   #45
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If all other components are in the circuit, post the DC voltage on all pins of U17.
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Old 22nd April 2013, 04:26 AM   #46
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