"OkCars- 22k Crossroads" (okcars)
08/08/2015 at 03:49 • Filed to: None
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"OkCars- 22k Crossroads" (okcars)
08/08/2015 at 03:49 • Filed to: None | 1
| 10 |
my cousins bass amp stopped working. There was a high pitch noise before the silence. The amp does turn on, at least the red LED does, but there isnt any sound coming from it. we proved that the cable isnt the problem, and his bass works on another amp.
What could be causing the problem?
Tareim - V8 powered
> OkCars- 22k Crossroads
08/08/2015 at 03:58 |
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can’t help with the issue but I have shared it on the soundboard for any possible help http://soundboard.kinja.com/
pip bip - choose Corrour
> OkCars- 22k Crossroads
08/08/2015 at 07:35 |
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NFI
zeontestpilot
> OkCars- 22k Crossroads
08/08/2015 at 09:26 |
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Do you have a multimeter? Go through it to see what has power running through it. The LED being on means the LED has power, but it doesn’t mean the rest of it has any power. Something broke, burnt, or stopped working properly; its best to narrow it down first.
Beetown
> OkCars- 22k Crossroads
08/08/2015 at 12:02 |
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Hard to say, but pop it open and look for blown up caps. Most modern caps are “vented” so they have little perforations that give when the cap goes bad. You will see brownish goo and the caps will bulge (they can also fail and appear totally fine visibly). One of these could have given out on the power supply rail for the power IC/transistors and killed the output. The bad news is it’s not likely worth paying someone to fix it if it’s one of those small fenders like the photo. Is there a line out and Does it work? Is the input jack loose? Do you have the ability to replace parts (soldering iron, wick, solder, etc)
Mattbob
> OkCars- 22k Crossroads
08/14/2015 at 08:02 |
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when you turn on the power is there any noise that comes from the speaker at all like a quiet pop as power comes on? Really your best bet is to open it up an look on the circuit board and see if anything looks like it got hot. In amps, there is a preamp, equalizer/effects circuitry, and a power amp section. Usually in solid state stuff, the power amp, or the power supply sections are most likely to go because of the heat that they put out due to handling the most power in the amp. If the light comes on, there is a good possibility that the power section still works(unless the light is powered off the very front end of the circuit). I suggest you look at the circuit board and replace anything that looks like it got real hot, and any bulging caps.
PLEASE DO NOT TROUBLESHOOT LIVE! unless you are very used to working with electronics, please do not troubleshoot this circuit live. There is 110V going through this amp when it is plugged in.
Echo51
> Mattbob
08/26/2015 at 04:16 |
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There is 110v going from the plug into the transformer/switch if any, then you’re dealing with lower-voltage DC from there on out. But yes, don’t prod around with something metal on a PCB that has power.
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Mattbob
> Echo51
08/26/2015 at 07:43 |
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“lower voltage” depending on the amp, this “lower voltage” could be 12 volts or around 300 volts for some tube amps.
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Echo51
> Mattbob
08/26/2015 at 07:53 |
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Ah yes, tube amps, forgot those. My bad.
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Mattbob
> Echo51
08/26/2015 at 08:59 |
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also, solid state amps for reference, the output voltage for the speaker can get pretty high too. For example a 25W RMS amp, has a voltage amplitude on the output of 16.8V, a 250W RMS has 53.2V peak at the speaker, assuming 8ohm speaker. Depending on what you do, there are supply voltages in there that can hurt you.
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Echo51
> Mattbob
08/26/2015 at 09:21 |
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240w RMS into 8ohm is something you only see in the seriouser audiophile gear or dedicated mono amps, which means rail voltages never get that high for consumer stuff. Like with all things(cars included), taking a look is fine, don’t go poking unless you know basics. Also most of those guitar amps are really high sensitivity, it’s alsmost crazy compared to car audio gear.