One board, both boards, boards in which location?
Is there DC pulsing on the output transistor tabs?
Is there DC pulsing on the output transistor tabs?
Perry Babin;One board, both boards, boards in which location?
both board in both spots.
Is there DC pulsing on the output transistor tabs?
yes. about 30v.
both board in both spots.
Is there DC pulsing on the output transistor tabs?
yes. about 30v.
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With neither driver board in the amp, solder a bridge between pins 13 and 14 of U105 on the audio PWM driver board. Do you have a square wave on 2 of the 3 pins of the 3-pin connector on that same board.
Do you see the same signal on 2 of the 3 pins?
Is your scope calibrated? I would expect the peak to peak amplitude to be a bit more?
If you look at pin 9 of the TL494, is the square wave very nearly perfect? I'd expect this one to be more square but I don't know if it's your scope or the signal.
Is your scope calibrated? I would expect the peak to peak amplitude to be a bit more?
If you look at pin 9 of the TL494, is the square wave very nearly perfect? I'd expect this one to be more square but I don't know if it's your scope or the signal.
If that's from pin 9, there is a problem with either the scope, the probe or the calibration of the probe to the scope.
In post 20, I asked if the transformer was shorted primary to secondary. You stated that was and stated that you found it but were not specific as to what 'it' was. Is the primary to secondary short fixed?
In post 20, I asked if the transformer was shorted primary to secondary. You stated that was and stated that you found it but were not specific as to what 'it' was. Is the primary to secondary short fixed?
it was a solder i think from my desolder pump that shorted the transformer out. its fixed.
With no power connected to the amp, what's the resistance from the B+ terminal to the secondary ground?
Isn't one of those pins connected to the secondary ground?
When you post scope images, always include the settings.
When you post scope images, always include the settings.
What's 'clear now'?
Do you read 0 ohms between any of the pins of the 3-pin connector and the secondary ground?
Where (precisely) did you connect your scope ground when you connected it to the secondary ground?
Do you read 0 ohms between any of the pins of the 3-pin connector and the secondary ground?
Where (precisely) did you connect your scope ground when you connected it to the secondary ground?
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