Question about B&K AV 125.7 7-Channel Amplifier

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B&k amp st 2140

I have a b & k amp st 2140. Audio is only present on the left output channel. I have switched the inputs to confirm that auio is present at the input for both channels. It seems like a fuse went, but there is not a reset or fuse. Thanks for your help!

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There are a few fuses inside the amplifier. The case lid will come off pretty easily once you remove all the screws. You can visually inspect fuses looking for the blown one (filament will be broken), or use a multimeter for ceramic fuses. However, the fuses in my B&K ST-1400 do have transparent cases. If once you replace the fuse, it blows again, then that would suggest an underlying problem.,
Cheers Jeremyt

Posted on Jan 30, 2010

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Posted on Jan 02, 2017

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No sound on left channel on home stereo optimus sta-795 will changing fuse out restore sound


Not likely! Suggest swapping input connection, red RCA connector to white and white to red and see if problem swaps speakers.

If still left channel bad swap speakers left to right see if problem follows speaker.

Check balance adjustment and confirm that it is set to the middle!

Check all other inputs and confirm always no left output.

The goal is to confirm that the left channel is defective!

The service manual is MS3102101 would normally be available from Radio Shack.

Check for defective capacitors or failed solder joints on the PC board. These units are repairable even by DIY however replacement recievers are relatively inexpensive.

Hope this helps?



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1 Answer

Not receiving STEREO output when toggle switch for mixer is in the STEREO position


Here are a couple of steps you can do first before opening up the mixer & I'll word this so that it covers every potential item, (Turntables, CDJ's, Rack Mount CD Players, External Player, PC, Laptop, etc.) Obviously there are a multitude of items that could be the cause of you only receiving your RIGHT MASTER OUT since you didnt specify what item this occurs with if not all. So here's a quick legend for you to follow my references regarding the NUMARK 5000FX Mixer so here we go:
*******************************************************************************
MIC/Line Phono/CD Phono/CD Phono/CD LA/LB Zone/Booth/Rec/MSTR
LO LO LO LO LO LO LO LO LO LO LOLOLO LO
RO RO RO RO RO RO RO RO RO RO RORORORO
********************************************************************************
1. Turntables - A) If being used make sure the little black switch on the back is set to Phono instead of CD. Plug just one table in, play the record & see if there's only one side of your MASTER output jumping and make note of it. Then repeat the exact same steps for all Phono inputs (total 3) & again make note of your MASTER output signal Left or Right or Both sides jumping. This will help you identify if its just a specific channell that only works on R or L.
B) Now do the exact steps above for the other turntable & this will confirm whether or not the Phono cables went bad on the turntable or if a specific channell is has gone bad while in Phono mode.
2. CDJ's/Rack Mount CD Player - A) Now just use your CDJ's/Rack Mount CD PLayer for the next test & be sure to now change the little black switch on the back from Phono to CD. Just as the steps with the turntable perform the same for this item in all possible RCA's (total 6) & note your MASTER channell output signals L & R.
B) Now do the same for the other CDJ/Rack Mount CD Player & this will confirm whether or not the RCA cables went bad on the CDJ's/Rack Mount Player or if a specific channell has gone bad while in CD mode.
3. Audio Cables OUT - A) There are a host of ways to have your audio come OUT & multiple configurations depending on how you record &/or bounce your audio OUT. Now since you say your MASTER OUT digital meter is only jumping on the R side depending on if you're going with RCA MASTER OUT or XLR BALANCED MASTER OUT either or is what'll show the digital reader bouncing with audio so check both. It could very well have been a cable going bad on you simple as that & you can check that by pluging your cable that works on the R side into the L side. If it starts showing a reading on the digital meter than you've solved the problem being a bad cable. Also don't forget to check your ZONE, BOOTH & RECORD OUTS as well however these will not show on your digital meter so open up your audio recording software to confirm that L & R sides are working for these.
B) Last but not least double check that your BALANCE knob is set directly at 12 o'clock, this could sometimes be the culpret.

Well I hope this helps & good luck.

WesTCo@sT
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1 Answer

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The "Front output" from the Pioneer deck would connect to the "Main In" on the Clarion EQ. I'm assuming that your Clarion EQ can only deal with one input, and will send the adjusted (equalized) signal out both of the outputs.
The "Front output" from the Clarion EQ should go to the "Front Input" on the 4 channel amp.
The "Rear output" from the Clarion EQ should go to the "Rear Input" on the 4 channel amp.
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1 Answer

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you need to run the left speaker output from the amp to the left speaker input on the Bose, the right speaker output on the amp to the right speaker input on the Bose, the center channel output on the amp(assuming it has one), to the center channel input on the Bose...then the right output on the Bose , to the right Speaker..the Left output on the Bose to the left speaker...and finally the center channel output on the Bose to the center speaker

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