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Thread: Behringer Eurolive B205D

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    Behringer Eurolive B205D

    I would like to know if someone has a Behringer Eurolive B205D with no output.
    This B205D was being used to monitor the output from a bands PA system which was pluged in to the Main IN on the back.
    The result was overheating of the trace connection from L2 ( Main In) to pin one on X9 connector.
    Now there is no output from any plugins on the front or rear.
    Any help about what would cause this would be greatly appreciated.

    Thanks
    Attached Thumbnails Attached Thumbnails 2015-08-25-14.23.07b.jpg   2015-08-25-15.44.40.jpg  

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    Senior Member Enzo's Avatar
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    Hi, welcome.

    No Sound Out would be about THE most common complaint about a powered speaker. Unfortunately that isn't very helpful, as there are a bazillion reasons for that to happen. Everything from a open speaker to a burnt up input, and everything in between.

    Please tell me no one connected a speaker line to this input. If a signal line is connected to the input and there is mains voltage on the connector, the tiny printed circuit traces will blow like a fuse, as apparently happened to you. In the process other damage could occur, you will just have to sort it out. Is there a power indicator on this model? Does it light up or is there any indication of life? Is the fuse in the IEC connector blown? Inside, are there power supplies present? Etc.
    Education is what you're left with after you have forgotten what you have learned.

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    Supporting Member Chuck H's Avatar
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    Quote Originally Posted by techie View Post
    This B205D was being used to monitor the output from a bands PA system which was pluged in to the Main IN on the back.
    The result was overheating of the trace connection from L2 ( Main In) to pin one on X9 connector.
    Does this mean that there was a speaker output plugged into the B205D "main in" input? Because that isn't a mains (as in speaker mains) input.

    http://www.behringer.com/assets/B205D_WebBrochure.pdf
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    Thank you for the welcome.

    I am trying to find the problem for a friend.
    I only know this B205D was being used as a monitor by way of the Main In combo jack on the back.
    There was no other equipment plugged in to the front.
    It sounds like your right about a possible mains voltage on the connector blowing the traces.
    There is a power indicator light on when powered up.
    There is faint sound/noise coming from the speaker but there is no volume adjustment or control of the inputs on the front controls.
    It seems to be working fine, but there is no amplification, seems like no input is getting to the amp.
    All three input channels on the front seem to be dead
    The main power fuse did not blow.
    I have replaced the blown trace.
    Next I will check the main circuit board.

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    Thank you for your reply

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    Supporting Member Jazz P Bass's Avatar
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    You need to identify the signal level that was applied to the 'Mains Input' jack.

    By design, it's purpose is to connect two (or more) B205D units together.
    The Thru is a small signal (like a mic) that is sent to the Mains In of the next unit.

    B205D Main In _ Thru.pdf

    The above post are asking whether or not an amplified signal (ie: power amp speaker out) was applied to the Mains In.
    If so, that is not good.

    According to the schematic the Thru signal is derived directly before the Mains Level control on the PCB.

    B205D Rear Thru IC3A.pdf

    I would set the unit up for testing with a signal going through from the front panel.

    Then look for a signal at the output pin of IC7 Pin 8.

    It is possible that the only damage , other than burnt traces & L2 being open, is to IC3.
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    Thank You

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    I would like to know where I can find info on Level_3, IC5 which looks like 4500 on the schematic and has
    A128A on the IC.

    IC5B has input audio signal ( mp3 player ) on pin 6 but no o/p from pin 7.
    Also IC5 has 14v on pin 8 and 7.


    Thanks

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    Senior Member Enzo's Avatar
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    It is a common 4580. Look at its power connections, lower right on that page, it is clearer.
    Education is what you're left with after you have forgotten what you have learned.

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    Thank You

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    The Main_IN on the back of the B205D has a connection through L2 to X9 connector.

    The Red wire on Connector X9 is connected to IC5 ( 8920 ) on the bottom the Power Supply board through L12, L3, and L1 to the OUT1 Pin 16 of IC5 ( 8920 ) .

    What is the purpose of IC5 ( 8920 ) and would a bad IC5 ( 8920 ) cause no signal o/p from the front CD_INPUT, LEVEL_3, IC5B pin 7 ?

    Why would an incorrect hookup to Main_IN causing a burnt trace from Main_IN, L2 to connector X9 on the back of the B205D cause no signal o/p from the front CD_INPUT, LEVEL_3, IC5B pin 7 ?

    The only damage I can see is on the Main_IN rear circuit board, the burnt trace from Main_IN, L2 to connector X9.

    Thank You

  12. #12
    Senior Member Enzo's Avatar
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    If I shot a hole in you with a gun, there would be an obvious visual clue. If I poisoned you, you would look no different from now. Anything that burns a trace off a board can also damage circuit components, and MOST times they look no different.

    The 8920 is your power amp. If it is bad, no input from anything will come out the speaker.
    Education is what you're left with after you have forgotten what you have learned.

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    There is no audio output from CD_Input, LEVEL_3, IC5 pin 7.

    voltagesb.jpg

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    Senior Member Enzo's Avatar
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    OK, but you also get no sound from any other input as well, is that correct? Which leads me to ask if you have checked for power supply at the op amp pins.
    Education is what you're left with after you have forgotten what you have learned.

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    The power indicator light is on.
    There is sound coming from the speaker.
    There is no sound being amplified from all three inputs.
    Everything seems normal except no amplification of the inputs.
    Like the amp is in standby mode.

  16. #16
    Senior Member Enzo's Avatar
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    So the power amp seems able to make some sort of sound, but no signal leaves the preamp.

    That leads me to re-ask if there is proper power supply at the ICs on the preamp.

    You mention no signal at pin 7 in channel 3. You have two other input channels, is there signal present at the output of either of those when input to? That would be pin 14 or IC6 and IC7.

    If all three channels make no output, then I stress that power supply is critical. And by no output, I mean right at the circuit, not the speaker. If those channels do work, then something in common to them all is involved. All the circuitry upper right on page 1 of the schematic.
    Education is what you're left with after you have forgotten what you have learned.

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    IC1 ( 7815 ), IC2 ( 7915 ) and IC3 (OP1 ), voltages.

    pwr-supply-b.jpg

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    Thank You Sir.

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    Supporting Member The Dude's Avatar
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    IC2 (7915) is a -15V regulator. This is your negative supply to the op amps. You have -23.7V in, but no -15V output. Either the regulator is bad, or there is a short on the -15V line. I would start by changing the regulator. If you still have no -15V, you likely have a short on the -15V line. Given that you have a positive voltage there, it could be that an op amp is "leaking" positive rail to negative rail.
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    Thank You Sir.

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    I replaced D3, D4 ( which were shorted ), these are connected to X10 5P ( FROM_REAR ) and R15, R17 and IC2B, still no change in -Vcc = +1.6v

    When I disconnect X12 4P connector ( which connects to the Power Supply Board ) from the Pre Amp circuit board the connector has Vcc Red = +14.8v, and -Vcc Brown = - 15.2v.

    When I re-connect X12 4P connector to the Pre Amp circuit board Vcc = +14.8 and -Vcc = +1.6v.

    Removing X10 5P and /or X11 3P has no effect on the Vcc = +14.8 and -Vcc = +1.6v

    2015-10-02-14.41.44.jpg
    2015-10-02-14.42.08.jpg

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    Supporting Member Jazz P Bass's Avatar
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    Quote:"When I re-connect X12 4P connector to the Pre Amp circuit board Vcc = +14.8 and -Vcc = +1.6v."

    Something on that board is loading down your -15V rail.

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    Do you have any idea what kind of short would give this -Vcc = +1.6v?
    Diodes?
    Op-Amp?

    Thank You.

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    As it is actually going positive, I would suspect something that is connected to both the + and - supplies, like an op amp.
    Feel around for any hot ones.
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    Thank you Sirs!

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    Senior Member Enzo's Avatar
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    Fell all the op amps with your fingertip. ANy getting hot?
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    There is nothing over-heating on the pre-amp board ( op amps , diodes, transistors, etc) .
    I do have C48 testing short.
    I removed C48 and the C48 circuit pads test short.
    C48 is to the left of Pin 1 of IC1 and is connected to X11 3P, Pin2 (BLK ).
    The schematic has C48 connected between X4 ( power amp ) and X16 but I do not see X16 on the schematic.

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    Senior Member Enzo's Avatar
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    Took me forever to spot C48. next time maybe some clues as to where to look. Lower left of page 1. X16 might be a ground wire. The cap looks to me like it connects sub-grounds together, and so would measure shorted.
    Education is what you're left with after you have forgotten what you have learned.

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    There are no overheating components.
    I have disconnected pin 4 ( -Vcc = -15v ) from op amp IC's 1, 2, 3, and 5, individually and all at once hoping this would show a short in one of those op amps,
    the result was no change in the -Vcc = +1.6v.

  30. #30
    Supporting Member The Dude's Avatar
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    If you look at the first page of the schematic, in the lower right it shows where +-15 goes to the IC's, you should check/unsolder all of those pins. Also, IC4 isn't shown on that part of the diagram, but it is the same pins as IC6&7. It's never fun tracking down a rail short. Sometimes you get lucky and it's the first thing you try. Sometimes it might be the last connection on the board. You just have to be thorough and look at all parts that have both rails connected.
    “Yeah, well, you know, that’s just, like, your opinion, man.”

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    Thank You

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    I disconnected pin 11 from IC6 ( pad=+1.56v, pin=+4.25v )
    I disconnected pin 11 from IC7 ( pad=+1.52v, pin=+5.76v )
    I disconnected pin 6 from IC4 ( pad=+1.97v )
    Disconnecting these IC's have no effect on missing Vcc-15v.

  33. #33
    Supporting Member Chuck H's Avatar
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    I know this may be more about the exercise and achievement than the actual item in question, but...

    These things cost about 200 bucks. This thread is three months old. I admit to having a definite, predisposed opinion about made overseas, disposable gear. But I think there's a limit to how much effort and analysis should be applied to these things.

    Maybe I should have kept this to myself. But I don't even think the people who designed this thing put as much consideration into it as the effort required to repair one.

    JM2C
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    Hmm, got one in where the rear panel input was fried.
    Fixed PC board and fried coils and IC3a was bad.

    So the rear main in should be able to drive to full power from a mic level?

    Only line level applied to rear will get me up to full output.
    Must have missed something.

    All front inputs are okay just rear muffed with low output.

    Time to crack it back open.

  35. #35
    g1
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    I would expect it to be line level, not mic level.
    Are you referring to post #6 above? I think he was generalizing and meant non-speaker level.
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