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BCF2000 Can anyone tell me the expected voltages out of power supply?

BCF2000 Can anyone tell me the expected voltages out of power supply?

2019-04-03 by z7x76catnvcrna6acgnqrrxmku6o7mmirs43my3w@...

Hi!


I have acquired a broken unit & was wondering if anyone who has a working Behringer BCF2000 unit (or a schematic) could tell me the voltages that are expected out of the switch mode power supply? - these are the voltages that are transferred out via the 6 pin cable from the supply to the slider board.


I am getting 5v and also 5.5v out of mine. I actually suspect that the supply is working ok and that I have an issue on the CPU board (most likely the main CPU chip or the RAM chip) which is preventing the unit from firing up. I am just wanting to rule out the power supply before deciding if it is worth looking into replacing some of the chips (which will not be easy seeing as most are surface mounted).


I noticed that the previous owner had allowed some liquid to seep in through the midi holes and onto a 20 pin (multiplexer?) surface mount chip near the CPU (it had turned a mossy coloured green - but it all came off rather easily with isopropyl).


I have replaced all four large caps on the supply, also the 6 pin optocoupler. The diodes all test ok including the rectifier diodes. I am not sure where (or how) to safely test the current to truly rule out the power supply.


I hope this message is not too technical for the forum. Admin, please let me know if it is.

I'm a bit stuck is all. Any advice/recommendations gratefully received. Thanks.

Re: BCF2000 Can anyone tell me the expected voltages out of power supply?

2019-04-04 by p.rafferty3577@...

"Mossy green" can be a bit concerning as is often a sign that the offending liquid may have had some corrosive content.

Corrosive stuff is usually highly conductive and can act like a spreading short-circuit if the device happens to be powered up at the time of ingress so who knows what kind of electrical damage is likely to result.

Close inspection with a good magnifier - looking for signs of the solder mask lifting and flaking off. A corrosive substance on a PC board attacks exposed metals and slowly migrates under the solder mask, eating tracks as it goes. Also can eat the (usually Tin) coating on IC pins and migrate into the IC package damaging it. PCB plate thrus and tracks underneath flat components like IC's are particularly vulnerable to corrosion damage as well.

It would be interesting to see what lies under that 20 pin chip, firstly inspection of the underside of the board, looking for signs of Mossy Green around plate thrus and tracks.

Good luck with it. I've found that it's better for one's own sanity to toss it if there is any sign of corrosion.

Cheers

RE: [bc2000] BCF2000 Can anyone tell me the expected voltages out ofpower supply?

2019-04-05 by ulises cortez

You can get the CPU from Behringer for like 10 bucks I live in ls vegas and theres a berhinger service place and that how much I got for.

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From: z7x76catnvcrna6acgnqrrxmku6o7mmirs43my3w@...m [bc2000]
Sent: Wednesday, April 3, 2019 11:12 AM
To: bc2000@yahoogroups.com
Subject: [bc2000] BCF2000 Can anyone tell me the expected voltages out ofpower supply?

  
Hi!

I have acquired a broken unit & was wondering if anyone who has a working Behringer BCF2000 unit (or a schematic) could tell me the voltages that are expected out of the switch mode power supply?  - these are the voltages that are transferred out via the 6 pin cable from the supply to the slider board.

I am getting 5v and also 5.5v out of mine. I actually suspect that the supply is working ok and that I have an issue on the CPU board (most likely the main CPU chip or the RAM chip) which is preventing the unit from firing up. I am just wanting to rule out the power supply before deciding if it is worth looking into replacing some of the chips (which will not be easy seeing as most are surface mounted).

I noticed that the previous owner had allowed some liquid to seep in through the midi holes and onto a 20 pin (multiplexer?) surface mount chip near the CPU (it had turned a mossy coloured green - but it all came off rather easily with isopropyl).

I have replaced all four large caps on the supply, also the 6 pin optocoupler. The diodes all test ok including the rectifier diodes. I am not sure where (or how) to safely test the current to truly rule out the power supply.

I hope this message is not too technical for the forum. Admin, please let me know if it is.
I'm a bit stuck is all. Any advice/recommendations gratefully received. Thanks.




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RE: [bc2000] BCF2000 Can anyone tell me the expected voltages outofpower supply? [1 Attachment]

2019-04-05 by ulises cortez

And power supply is what I ment the psu power supply unit

Sent from Mail for Windows 10
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From: ulises cortez ucortez@... [bc2000]
Sent: Thursday, April 4, 2019 8:46 PM
To: bc2000@yahoogroups.com
Subject: RE: [bc2000] BCF2000 Can anyone tell me the expected voltages outofpower supply? [1 Attachment]

  
[Attachment(s) from ulises cortez included below] 
You can get the CPU from Behringer for like 10 bucks I live in ls vegas and theres a berhinger service place and that how much I got for.
 
Sent from Mail for Windows 10
 
From: z7x76catnvcrna6acgnqrrxmku6o7mmirs43my3w@... [bc2000]
Sent: Wednesday, April 3, 2019 11:12 AM
To: bc2000@yahoogroups.com
Subject: [bc2000] BCF2000 Can anyone tell me the expected voltages out ofpower supply?
 
  
Hi!
 
I have acquired a broken unit & was wondering if anyone who has a working Behringer BCF2000 unit (or a schematic) could tell me the voltages that are expected out of the switch mode power supply?  - these are the voltages that are transferred out via the 6 pin cable from the supply to the slider board.
 
I am getting 5v and also 5.5v out of mine. I actually suspect that the supply is working ok and that I have an issue on the CPU board (most likely the main CPU chip or the RAM chip) which is preventing the unit from firing up. I am just wanting to rule out the power supply before deciding if it is worth looking into replacing some of the chips (which will not be easy seeing as most are surface mounted).
 
I noticed that the previous owner had allowed some liquid to seep in through the midi holes and onto a 20 pin (multiplexer?) surface mount chip near the CPU (it had turned a mossy coloured green - but it all came off rather easily with isopropyl).
 
I have replaced all four large caps on the supply, also the 6 pin optocoupler. The diodes all test ok including the rectifier diodes. I am not sure where (or how) to safely test the current to truly rule out the power supply.
 
I hope this message is not too technical for the forum. Admin, please let me know if it is.
I'm a bit stuck is all. Any advice/recommendations gratefully received. Thanks.
 


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