I took delivery of a new Warm WA-412 today. Long story short, phantom power is wonky. It worked for about 5 minutes until I disengaged it to plug in another mic; when I re-engaged it made a loud pop and crackle with a static-sounding tail through my cans. Have tried everything and narrowed it down to the phantom power on channel 2.
I’m no electrical engineer, but does this sound like a possible easy fix, or should I start the return and exchange?
Side note - I have owned a small boat load of Warm gear over the years; this is the first QC issue I’ve personally encountered.
If so, then unplug the unit, open it, and inspect. Follow the phantom power from the power supply, and try to find out where the problem is. There should be a phantom supply cap, a resistor, and a pair of resistors that are common 48V rail on one side and XLR pin 2 and 3 (and the input transformer primaries) on the other. Not much to check.
If it’s easier, power it up (be careful with the lid off!) and use a multimeter to probe the traces checking VDC.
Post by johneppstein on Feb 11, 2020 21:18:19 GMT -6
Well, since it's a new unit under warranty I see absolutely no reason to not send it in for servicing - and one VERY good reason for doing so. Specifically, if you're not authorized to work on it that gives the company reason to void your warranty in the event that something really serious might go wrong within the period.
Thanks, everyone. So, I walked away for about a half-hour...now it’s working again. I promise I’m not crazy and carefully eliminated everything else in the chain. I’m going to leave it on overnight and see where it’s at in the morning.
Strange issue. Again, not an electrical engineer. But, basically, start the unit cold and the phantom power works. Let the unit run for 5 or 10 minutes and then phantom power on the channel "dies." Channel still passes signal, just no 48V power. Worked last night after cooling it down and starting back from "cold." Left it on overnight and now not working this morning. Retailer is thankfully and graciously overnighting a replacement. Am genuinely curious to hear those in the know on these things speculate as to the possible issue...