Question about Behringer Europower Pmp5000 Powered Mixer Pmp5000
Inspected the boards and components for visable signs and found nothing wrong that I could see. I use this board at church and there was a power spike then it started doing this.
This is a wild educated guess.
I repaired a Behringer guitar amp that had a DSP effects in it (BX1200 I believe).
The effects were on a seperate board and the board had its own 5 volt power supply. The filter capacitor for the 5 volt power on the board was UNDERSIZED and it had degraded causing the 5 volts to drop out of regulation, dipping to 4 volts. This caused the DSP effects to fail.
YOUR device MAY use the same DSP OR design.
Check the 5 volt power with an OSCILLOSCOPE to look for dips below the 5 volt operating point that occur at 120 HZ.
Posted on Oct 24, 2009
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Posted on Jan 15, 2010
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
use 1/4 inch speaker cables. hook one speaker up to "main 1 R" out and the other to "main 1 L" out. if you have additional main speakers, hook them up the the "main 2" outputs.
look for the "bridge amp mode" switch and move it to the "main L- main R" position.
Posted on Nov 06, 2010
SOURCE: Hello! I have a
Often teh power supply fails because of other problems. Unless the board has flame damage the parts that are defective can be replaced... Getting some of the parts that are special can take time. Most of the components are available at many sources however. The SPS400 power supply can be repaired.
Here is link to schematic that should have the SPS400 as well as the rest of the PMH1000 on it.
Posted on Jan 18, 2011
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