Hello friends, I am completely new here, and I have a problem that I'm hoping you might be able to help with.
A while ago my Behringer bass amp start making a loud clunk if it tilted too far one way or the other, like something heavy was loose inside. Eventually the amp stopped making any noise at all, and I opened it to find that, in fact, there was a big metal thing loose in the bottom of the amp (pictured).
I work as a musician and I know a fair amount about how the external parts work in live audio, but I am a complete novice about electronics or any of the inside parts. I just like taking things apart to see if I can figure out how they work.
So obviously the big metal thing needs to be bolted back to the inside of the amp, that I can deal with. But the real issue is that the amp isn't producing any sound. Where would I begin to test what isn't working? Can you tell just from the picture if something isn't properly attached?
Thanks in advance!
A while ago my Behringer bass amp start making a loud clunk if it tilted too far one way or the other, like something heavy was loose inside. Eventually the amp stopped making any noise at all, and I opened it to find that, in fact, there was a big metal thing loose in the bottom of the amp (pictured).
I work as a musician and I know a fair amount about how the external parts work in live audio, but I am a complete novice about electronics or any of the inside parts. I just like taking things apart to see if I can figure out how they work.
So obviously the big metal thing needs to be bolted back to the inside of the amp, that I can deal with. But the real issue is that the amp isn't producing any sound. Where would I begin to test what isn't working? Can you tell just from the picture if something isn't properly attached?
Thanks in advance!
Attachments
See two large black cylinders.
To the right a white socket with two pins.
With all power off push the loose plug with wires into place.
It will only go one way.
To the right a white socket with two pins.
With all power off push the loose plug with wires into place.
It will only go one way.
I was really hopeful that would fix everything!
But now there is a horrifying noise as soon as I turn it on, even with the volume at zero.
There may be more wrong with this amp than I was willing to admit...
But now there is a horrifying noise as soon as I turn it on, even with the volume at zero.
There may be more wrong with this amp than I was willing to admit...
The big thing is the board containing power amplifier and power supplies. If faulty, then it will make much noise, heat up, blow fuses or even blow the loudspeaker.
Your speaker protector has found a fault or continuous dc offset
use a bulb limiter to find the fault
1st:
Check transformer ac voltage and then your dc rail voltage first if everything is reading properly then those big caps are ok (dc is 1.4times of ac voltage)
2nd test if rails are proper
Check for burned/broken traces and make sure it has continuity
3rd test:
Test and check for faulty diodes and faulty zener diode
4th test:
If the rail voltage and traces are ok then
Check those small transistor resistance it should have in k or millions ohms.
5th test:
Test the 4 Big Moseft
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Hi,
Go back to the dealer where you bought it and create an utter stink.
That is an appalling fault that the dealer should sort out for you.
Don't take no for answer, it was clearly sold to you as unfit for
purpose, assuming you had never taken apart or the like.
Your rights are against the retailer, though I don't know US consumer law.
rgds, sreten.
Go back to the dealer where you bought it and create an utter stink.
That is an appalling fault that the dealer should sort out for you.
Don't take no for answer, it was clearly sold to you as unfit for
purpose, assuming you had never taken apart or the like.
Your rights are against the retailer, though I don't know US consumer law.
rgds, sreten.
Depends on how old it is and whether you are the original owner. The maker warrants the unit, but only for a specified period of time. I forget what Behringer warranty coverage is now.
If it was a recent purchase of new product, then by all means tell the retailer. if this is something that happened to a two or three year old amp, I doubt you will find help. It can be repaired easily enough though.
Was this amp in your possession the whole time and just one day started to thunk around and stopped making sound? Or did you receive it in this condition. As a repairman, if I open an amp and see the electronics chassis loose inside and the speaker wires unplugged, my first reaction is the amp failed, and someone partly disassembled things trying to fix it. Your connecting the speakers back up and getting the loud hum suggests to me the amp is "blown" and producing DC on the output.
If it was a recent purchase of new product, then by all means tell the retailer. if this is something that happened to a two or three year old amp, I doubt you will find help. It can be repaired easily enough though.
Was this amp in your possession the whole time and just one day started to thunk around and stopped making sound? Or did you receive it in this condition. As a repairman, if I open an amp and see the electronics chassis loose inside and the speaker wires unplugged, my first reaction is the amp failed, and someone partly disassembled things trying to fix it. Your connecting the speakers back up and getting the loud hum suggests to me the amp is "blown" and producing DC on the output.
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