One out of the four 4.7 ohm resistors right behind the speaker terminals keeps burning after replace .what can cause that?
Drive signal on the output FETs for one channel not looking good at all.I replace the FETs but no change. Any suggestions?
Drive signal on the output FETs for one channel not looking good at all.I replace the FETs but no change. Any suggestions?
Attachments
What model amp?
There is likely a capacitor in series with that resistor. It could be shorted.
Is the rail-rail oscillation frequency for the channel with the bad drive the same as the other channels?
Is the channel with the bad drive the same one with the burned resistor?
There is likely a capacitor in series with that resistor. It could be shorted.
Is the rail-rail oscillation frequency for the channel with the bad drive the same as the other channels?
Is the channel with the bad drive the same one with the burned resistor?
Is the rail-rail oscillation frequency for the channel with the bad drive the same as the other channels?
Went back to this amp today.
Channel 1 and 2 plays good audio but ch2 is the one that will burn up the resistor when connected.The outputs for ch2 is also heating up faster than ch1.The resistor is out of circuit when I compared the two.The frequency for these two channels are close to each other.
Channel 3 and 4 frequency do not march the other channels.It’s going up and down fast.Audio from these channels sound distorted .
Channel 1 and 2 plays good audio but ch2 is the one that will burn up the resistor when connected.The outputs for ch2 is also heating up faster than ch1.The resistor is out of circuit when I compared the two.The frequency for these two channels are close to each other.
Channel 3 and 4 frequency do not march the other channels.It’s going up and down fast.Audio from these channels sound distorted .
No handheld
I now have my scope set to differential mode base on info from a next post.
I also have a digital scope
I now have my scope set to differential mode base on info from a next post.
I also have a digital scope
Compare the waveform across the burned resistor to the other corresponding resistor locations. You may have to install a new resistor and quickly check across it before it burns.