I got one of these to fix... I got the amp to power up and play. When the bass hit its really distorted. But at low volume it plays ok. Any thoughts on what to check?
i traced it back to the ir4426 thats putting out the bad drive signal on half of the outputs. do these ic's normally fail?
Are you sure that this isn't a ZX amplifier instead of a KX. I don't remember the 4426 being used in the KX series amps.
I've never seen one fail in the ZX series amps but I haven't had to repair many.
I've never seen one fail in the ZX series amps but I haven't had to repair many.
Please read the 'Best Initial Settings' section on the oscilloscope page (page 73) of the site and re-post the waveform.
Is that AC or DC coupling? You need to use DC coupling. You also need to set the 'variable' to the cal position (fully clockwise).
You also need to post the settings for the vertical amp and timebase on the scope. In an earlier post, there was a '1' in the scope settings that you posted. I don't know what this was. If it was 1v, there is a real problem. If it was 1v but you're using a 10x probe, that would make more sense and the actual vertical amp setting would be 10v, not 1v.
You also need to post the settings for the vertical amp and timebase on the scope. In an earlier post, there was a '1' in the scope settings that you posted. I don't know what this was. If it was 1v, there is a real problem. If it was 1v but you're using a 10x probe, that would make more sense and the actual vertical amp setting would be 10v, not 1v.
Set the vertical amp to 5v/div and the prove to 10x.
What's the DC voltage with the black probe on pin 3 and the red probe on pin 6 of this 4426?
What's the DC voltage with the black probe on pin 3 and the red probe on pin 6 of this 4426?
the issue is just the output section. other signals show up fine
What's the DC voltage with the black probe on pin 3 and the red probe on pin 6 of this 4426?
8.44v+
What's the DC voltage with the black probe on pin 3 and the red probe on pin 6 of this 4426?
8.44v+
You'll have to post a waveform with the scope settings that I asked for.
What is the DC voltage on those pins of the other 4426?
What is the DC voltage on those pins of the other 4426?
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