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I need a circuit diagram for a Behringer Eurorack 602A, so I can fix it. I also need to know where I can get an ALPS pot, 50k, to replace the broken channel 1 volume control.

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Try  www.radioshack.com  for parts.

Posted on Mar 10, 2009

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That part can be purchased as a generic part. There is nothing special about it. You should be able to locate one at a local electronics parts store. If you can post your general location, I will try to post a few shops in your area that should have it.

Dan

Posted on Mar 10, 2009

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I open my CS900 Peavey power Amp to service. This is when I realised that One Gain Pot is B50K and one is C100K. Is this normal or has it been changed ? the Two Gain Pot looks like it is not the Original...


Firstly, the two kinds of currently available pots are A and B, these are logarithmic (A) and linear (B) in their function.

Older pots were marked differently though, it used to be that linear was marked A, and logarithmic marked C.

A gain control should use a logarithmic control ( A, in the new coding system, or C in the older system ) so there's nothing wrong here.

As for the value to use, I would suggest replacing with 100K, the same value as the pot marked with the C, as this is an older marking code this pot was probably in the circuit originally and the 50K pot marked with the A probably found it's way in there in the more recent past.

I hope this helps

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you might try Radio Shack for the pot, also a larger music store with or without repair dept, typically stock various pots like that, some with audio taper and some with linear taper Also if Radio Shack doesn't actually have it in stock they have an extensive parts suppy catalog in the store, also Allied Radio out of Chicago is another option, good luck

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Jan 09, 2010 | Audio & Video Receivers

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Hey kfc-jake

Behringer the whole world wide are pretty good on spare parts. You could get a tech to replace the plug for you. Where abouts in the world are you and I can get you hooked up?

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My Teac Z-7000 will not record tapes


Hello,
some weeks ago I got this really impressive deck (Teac Z 7000) from a colleague, and found the same problem. I fixed it, and the fix is not too complicated. It´s the potentiometers that do fail. All pots are from the same manufacturer (Alps) and construction. The problem is that the wisher is broken away from the holding plastic and will loose contact completely. You can check that with a normal ohmmeter: You´ll find the total resistance over the outer terminals but endless resistance from one of the outer terminals to the middle wisher contact. The values are: 100 kOhm linear for each of the upper left pots (fader,space), 2x22kOhm pos.log. for the lower left pot (phone volume). So, what does a broken wisher at the "fade in" pot do? The Recorder "thinks" that You selected an "endless" fade in time, and the result is : no record level. You can do an easy "quick and dirty" fix just to see if that´s the problem: Hold- or better solder- a say 47kOhm resistor in parallel to the conducted potentiometer terminals and try to record.
4 of 5 pots have been defective in my deck, and I´ve replaced them with standard types from my local electronic supplier (Conrad electronic, has a shop in Frankfurt/Main). Well, the new parts didn´t fit perfectly, I used a file to get them in (not visible from outside). Also I lost the possibility of pushing the knobs in and out, but that is not a really problem.
I assume this fix might also help owners of the Teac Z-6000 and Z-5000, which- most probably- use the same type of potentiometers.
This text was written by Boris Witke, Kelsterbach (near Frankfurt/Main), Germany. E-Mail:
witke1@web.de Please tell me if You were successful, possibly we get lucky users of these really fascinating machines.

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