The desk initially switches on fine, and works as normal, but after around 10 minutes, the power just quietly dies, and it takes a few minutes before it will power up again. We have traced the problem to the desk, not any external power issues. Any idea why this might be the case?
SOURCE: Behringer XENYX 1622FX, won't power on. Phantom power works(?)
After reviewing the schematic, I don't understand how the Phantom power can REMAIN on with the power switch off... this CANNOT occur except for what energy is left in the 48 volt supply filter cap... This might last for minutes after the fuse went... UNLESS you have devices connected which are backfeeding the 48 volts. (which would be a disaster)
The 48 volts, +/- 12 volts and +/- 15 volts and the +5 volts ALL come from the SAME switching power supply. I suspect one of the filter caps went or the primary switching regulator a TDP245Y chip.
You should ONLY work on the line side of this using an ISOLATION transformer since the line side has lethal voltages.
To do testing, one replaces the fuse and puts a 60 Watt light bulb in series with the hot side of the inout line. The lamp "acts" as a resetable fuse and limits the current for testing. When all is well again, the lamp will remain out with the power flowing through it.
The D1 diode bridge and C7 input rectifier and filter are first things to check. You can do those with an ohmmeter.
I will caution you to ALWAYS power any and all equipment from the SAME power source. Plugging in devices from across the room will set up ground loops and any ground fault will fry equipment.
SOURCE: I have a behringer xenyx 2442 and the main output
The utput fader has probably been broken. If the knob takes a hit, it breaks the resistance element. The part is inexpensive but it takes a lot of work to access and replace the part.
SOURCE: I have a behringer xenyx
First thing to check is look in the Windows Control Panel at the the "Sounds and Devices" and verify that the 2442USB IS the device for both input and output instead of the usual PC audio devices. You should see a pulldown list including both for those... If not, your SW driver is NOT loaded properly.
SOURCE: I have an Behringer Xenyx 1222FX that won't power
The phantom power light wouldn't illuminate unless the unit was powered on. Possibly the main power indicator light is burned out.
SOURCE: how much output power supply
The supply will be similar to that in the 1222. Download a schematic here. Look at the SPUS2 portion of the compressed file.
http://elektrotanya.com/behringer_xenyx-1222fx_v1000_dpm5m_ub-spsu2_sch.zip/download.html
There are several voltages present.
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