I have a Drawmer DL441 in for service. The unit is outputting white noise and some oscillation / motorboating from the outputs on all 4 channels.
I suspected something in the PSU, but I've replaced the main 2200uf PSU caps and rectifier diodes with no change to the noise. I'm able to measure +/- 15VDC output from the regulators.
Does anyone have an idea of what else could be causing this? I've searched around online and have seen some people who have had issues with the power transformer of the DL241, wondering if that's suspect in this unit?
I see a few of the 220uf output coupling caps look a little buldged, I may try replacing those but I'm not sure that's the root of the issue here.
Any Drawmer experts out there have any ideas?
I suspected something in the PSU, but I've replaced the main 2200uf PSU caps and rectifier diodes with no change to the noise. I'm able to measure +/- 15VDC output from the regulators.
Does anyone have an idea of what else could be causing this? I've searched around online and have seen some people who have had issues with the power transformer of the DL241, wondering if that's suspect in this unit?
I see a few of the 220uf output coupling caps look a little buldged, I may try replacing those but I'm not sure that's the root of the issue here.
Any Drawmer experts out there have any ideas?