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Fixing BCF2000 power supply

Posted in bcf2000, electronics, fix by Drew Perttula at 2016-03-09T01:30:52.070310-08:00

I have a BCF2000 midi controller which I got in 2007 and it started being flaky. The motors didn't run, and USB didn't register well. Here it is misspelling its own product name and otherwise failing to set up:

[1559654.831070] usb 1-1: config index 0 descriptor too short (expected 101, got 55)
[1559654.831075] usb 1-1: config 1 has an invalid descriptor of length 0, skipping remainder of the config
[1559654.831078] usb 1-1: config 1 has 0 interfaces, different from the descriptor's value: 2
[1559654.831656] usb 1-1: New USB device found, idVendor=1397, idProduct=00bc
[1559654.831669] usb 1-1: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[1559654.831672] usb 1-1: Product: BCF200
[1559654.831674] usb 1-1: Manufacturer: BE一䜀䔀刀

[1559659.668903] usb 1-1: new full-speed USB device number 48 using xhci_hcd
[1559659.797558] usb 1-1: config index 0 descriptor too short (expected 101, got 1)
[1559659.797563] usb 1-1: invalid descriptor for config index 0: type = 0x0, length = 1
[1559659.797566] usb 1-1: can't read configurations, error -22
[1559659.908832] usb 1-1: new full-speed USB device number 49 using xhci_hcd
[1559660.020929] usb 1-1: Device not responding to setup address.
[1559660.241696] usb 1-1: config index 0 descriptor too short (expected 101, got 60)
[1559660.241704] usb 1-1: config 1 interface 1 altsetting 0 has 0 endpoint descriptors, different from the interface descriptor's value: 2
[1559660.242579] usb 1-1: New USB device found, idVendor=1397, idProduct=00bc
[1559660.242583] usb 1-1: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[1559660.242586] usb 1-1: Product: BCF00
[1559660.242588] usb 1-1: Manufacturer: BRINGER

[1559661.955604] usb 1-1: USB disconnect, device number 49
[1559664.971591] usb 1-1: new full-speed USB device number 50 using xhci_hcd
[1559665.100817] usb 1-1: config index 0 descriptor too short (expected 101, got 55)
[1559665.100822] usb 1-1: config 1 has an invalid descriptor of length 1, skipping remainder of the config
[1559665.100825] usb 1-1: config 1 has 1 interface, different from the descriptor's value: 2
[1559665.102234] usb 1-1: New USB device found, idVendor=1397, idProduct=00bc
[1559665.102238] usb 1-1: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[1559665.102240] usb 1-1: Product: BCF2000
[1559665.102242] usb 1-1: Manufacturer: BEHRINGER
[1559665.103580] usb 1-1: cannot find UAC_HEADER
[1559665.103596] snd-usb-audio: probe of 1-1:1.0 failed with error -22

Upon seeing forum posts like this one I opened the case and saw that my filter caps had indeed burst a little.

I soldered in new ones (like Jameco part 1000 uF 16 Volt Radial Capacitor):

and now it works great:

[1568546.232394] usb 4-1.6: new full-speed USB device number 83 using ehci-pci
[1568546.326265] usb 4-1.6: New USB device found, idVendor=1397, idProduct=00bc
[1568546.326270] usb 4-1.6: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[1568546.326273] usb 4-1.6: Product: BCF2000
[1568546.326275] usb 4-1.6: Manufacturer: BEHRINGER

Martin Russell - March 29
This was golden advice, apart from the fact that my psu board must be a different revision to the one shown here - on my BCF the capacitors in question are situated along the edge of the pcb directly below the IDC ribbon cable connector. I used your article as a basis for ordering some new ones, which I got as a pack of 4 from amazon. Just as well I got the four of them because the first two, although they fixed the fault, were slightly taller than the old ones I removed and prevented the top from being able to go back together completely as the bottom of the IDC connecter was hitting the top of the new capacitors. The only workable solution that would allow proper re-assembly was to replace these with the two unused ones, which I mounted leaning backwards off the pcb with their legs bent at a right angle, using some silicon sleeving to insulate the legs. All good. Many thanks for this page. Anyone attempting the same repair with taller capacitors should be aware that they may need to be mounted in a way that avoids them touching the IDC connector. Finally, nail varnish remover is your friend when undoing the two clear nylon nuts and bolts which hold the psu board to the chassis. Good luck!
woodiskingser - April 21
ich habe ein Problem mit diese
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