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Posted on Jan 02, 2017
Make sure the three position slide switch is set correctly for the stereo usage, that is NOT the bridged OR the Mon mode.
MAKE SURE the pan pots are set to middle as they control the spit of the audio to the two channels.
This is a class "D" amplifier (switching) and there really isn't any fuse for a single channel.
MAKE SURE your speakon connections are good by swapping your speaker cables.
I repaired my unit and had to do that without schematics... Behringer will not give them out. Mine had a severe arc-over on one side power amp taking out about ten transistors and diodes and one swithcing regulator chip. Had to cut out the "cancer" of the burned board.
This unit uses a complementary output stage that is made up of one transistor on one side and a pair in parallel on the other. This drives the inductor/capacitor filter... I think the switching frequency is between 100KHz and 1 MHz as I recall. All those transistors were gonzo. It also fried the main power switching transistors in the power supply, several smaller transistors, diodes, and the switching regulator chip.
Also two 10 ohm power resistors were fried. They soft start this unit by charging the main caps via two resistors that limit the inrush current.
A small switching supply has to come up first before the main supply which sends the DC to the amp section.
Posted on Nov 23, 2009
Probably the channel A went. If you are fortunate, the power supply is still OK. There are protection circuits for the speakers, however you MUST use speakers that are rated at over 400 Watts. If you use smaller ones, they can get blown. There is a weakness primarily on insulation for channel A and an arc between layers of a circuit board can wipe out several transistors and a zener diode and sometimes a metering resistor. Once this happens, have unit serviced before using it again as further damage can result.
ALSO PLEASE read my tip I posted on FIXYA regarding a grounding hazard when using Speakon to 1/4 inch speaker cables... essentially the barrel of the 1/4 inch jack of the A channel is the hot lead, NOT the tip for that channel.
Posted on Nov 27, 2010
Yes, you can use both the main1 and main2. They are independently driven and please note that they are PSUEDO balanced drives... that is the cold side of the balanced line is NOT driven as a complement, but is merely returned to signal ground by a 120 ohm resistor. This CAN cause hum problems or noise pickup depending on the connected equipment and ground loops. Best to run this into amps/speakers thaat have TRUE balanced inputs and also keep the power source the same for all devices.
Posted on Nov 02, 2011
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