Question about Behringer Xenyx 502 Audio Live Music Mixer New!
HI, Recently I purchased a Behringer Xenyx 502 to go with my Behringer C-1 microphone to do some acoustic recordings. Originally I had a large buzzing sound through the output that I was able to largely get rid of by changing my power source, however there is still a static noise I am unable to get rid of. I unplugged my microphone so that there was no inputs and I still get the buzzing. It does go away when I turn the gain/output levels down however this kills off the output to the point where any recordings are almost silent. Anyone else had this problem and managed to find a solution? Thanks
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Posted on Jan 02, 2017
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.
Posted on Apr 05, 2010
It appears that both these use a 50K pot in the identical circuit and it is UNLIKELY they re-engineered very much so it is likely they use the same pot.
Behringer parts service should be able to tell you.
Posted on Apr 28, 2010
Behringer uses 4580's in appropriate packaging everywhere. There are 339 comparators for the level indicator area.
The Mackies uses both NJM2068 and NJM4560M
The 2068' are used in most of the low noise areas and the 4560 is used in the 75Hz high pass filter for example.
Posted on Jul 23, 2010
The phantom power light wouldn't illuminate unless the unit was powered on. Possibly the main power indicator light is burned out.
Posted on Jan 16, 2011
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.
There are several voltages present.
Posted on Jan 20, 2011
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