Question about Behringer Pmp3000 16 Channel Audio Mixer
I have an Europower PMP 3000 which the PLF light on the 2nd channel never goes out, also I would like to know how long does the waranty last for this piece of equipment.
The circuitry is a bit complex for that PFL light. The LED is driven by a transistor T38 type BC846 to turn it OFF by grounding out the current coming by way of teh MUTE LED or the MUTE switch (SW14) horts out the MUTE LED. There is a 1K limiting resistor from +15 volts feeding the two LEDS in series.
IF transistor T38 is open the PFL will be on. HOWEVER T38 will also be turned off if transistor T44 (BC846 type NPN) or if capcitor C90 2ufd/50v is shorted OR if resistor R253 is open OR is switch SW8 (PFL DPST )is not contacting the ground side of of the half tied to R247. If R247 is open that will also cause the PFL LED to illuminate...
AND if the signal coming in is at clippling level the PFL LED will light.
All that circuitry serves as a clip detector plus the PFL function.
Verify you are not sending clipping level into the channel first... turn the trim off. If not, you are in for major surgery as all the knobs for that section of the circuit board and the screws for the XLR's and the 1/4 inch jacks must come off as well as some support screws IF it is necessary to access the top side of the board... Maybe you will get lucky and the bad component MIGHT be on the bottom of the board.
Posted on May 15, 2010
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Posted on Jan 02, 2017
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