B & K Pro10MC

Gary Hubbard · 29th November 2009, 04:42 AM

Help, Gang. My trusty old B&K Pro 10 MC has decided to stop working and I am not savvy enough to get a handle on it. I has only a few hours use , never subjected to abuse or damage. Could a bad power/on switch be doing it?

Spiny · 29th November 2009, 08:52 AM

Dose this have an external power supply?

If so Check that is working (measure its output), If good suspect the socket on the back of the preamp, On many items the PCB connection of the power socket fails and needs re-soldering onto the internal PCB. If bad suspect the cable from the back of the Power supply to the pre-amp plug.

Power switches can fail but its not common

Gary Hubbard · 30th November 2009, 12:19 AM

Spiny: thank you for the response; yes it has a 1.5x2x4" black box 2 feet out on the power cord. Strangely enough, said box only has a 1/2 amp fuse in it - which did not appear to be blown. I cannot find a check point to put a VOM lead and would not know what voltage to set it. The on-off lighted switch does not light and is marked 12 volt. It is a 3 bladed switch. I am stumped.GH

Spiny · 30th November 2009, 06:09 AM

The cord unplugs at the pre-amp end leaving the plug exposed on the lead I guess. it should be possible to measure the voltage on the plug - depends on the type,which method to get to the contacts Paper clips can be good

. measure, I suspect its dead. Alternativly with the covers off measure at the back of the socket it plugs into.

At a guess the voltage from the PSU is supposed to be 12V

. If its a 3 contact plug the _12 -12 and 0. set the VOM to 200+ before any measurements. Start high its easy to move to a lower range.

Black box PSU's these days tend to be SMPS and are sealed in their cases. Pain to fix

29th November 2009, 04:42 AM	#1
Gary Hubbard diyAudio Member Join Date: Dec 2008 Location: Rockford, IL	B & K Pro10MC Help, Gang. My trusty old B&K Pro 10 MC has decided to stop working and I am not savvy enough to get a handle on it. I has only a few hours use , never subjected to abuse or damage. Could a bad power/on switch be doing it?

30th November 2009, 12:19 AM	#3
Gary Hubbard diyAudio Member Join Date: Dec 2008 Location: Rockford, IL	External Power supply Spiny: thank you for the response; yes it has a 1.5x2x4" black box 2 feet out on the power cord. Strangely enough, said box only has a 1/2 amp fuse in it - which did not appear to be blown. I cannot find a check point to put a VOM lead and would not know what voltage to set it. The on-off lighted switch does not light and is marked 12 volt. It is a 3 bladed switch. I am stumped.GH

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29th November 2009, 08:52 AM	#2
Spiny diyAudio Member Join Date: Feb 2008	Dose this have an external power supply? If so Check that is working (measure its output), If good suspect the socket on the back of the preamp, On many items the PCB connection of the power socket fails and needs re-soldering onto the internal PCB. If bad suspect the cable from the back of the Power supply to the pre-amp plug. Power switches can fail but its not common

30th November 2009, 06:09 AM	#4
Spiny diyAudio Member Join Date: Feb 2008	The cord unplugs at the pre-amp end leaving the plug exposed on the lead I guess. it should be possible to measure the voltage on the plug - depends on the type,which method to get to the contacts Paper clips can be good . measure, I suspect its dead. Alternativly with the covers off measure at the back of the socket it plugs into. At a guess the voltage from the PSU is supposed to be 12V . If its a 3 contact plug the _12 -12 and 0. set the VOM to 200+ before any measurements. Start high its easy to move to a lower range. Black box PSU's these days tend to be SMPS and are sealed in their cases. Pain to fix

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