Question about Marshall 15 Watt Guitar Amp

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Vs232 has power and makes noise when you plug in to input but no output

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Check that you have 15 volts across C19 and C20.

If either are bad, suspect ZD1 and ZD2 regulating Zener diodes.

Check the soldering and condition of the input jack as these are chronically bad due to damage of yanked cords.

Posted on Apr 28, 2010


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Fender mustang noise

This isn't much information to go on. I may can help if you could be more specific. What amp? Presets of what? What software? What noise gate? Where is this noise, amp output or pc input? A computer sound card can do weird things when musical equipment is plugged into it, some mice will do it, making noise when you move the mouse around. I'm guessing how you are set up, if you get back to me, I will try to help you further.

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How to remove white noise in my ub802

It can be a number of things.

Bad ground, excess gain, excess number of mixer channels with no inputs, Make sure the mixer inputs you are going to use are the only ones that are up. Power supply noise- flourescent lighting noise, Clamp on ferrites on the power cords of everything can help reduce this. You can sometimes track the offending source with a battery powered AM/MW radio.

It can also be caused by going from a balanced output to an unbalanced input with some impedance differences.

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Danelectro Hodad Mini Guitar Amplifier - no sound output

Do the cables have the right length plug/jack ends? There are 5 different lengths in use. Some will short the inputs completely.

Do you get noise floor from the amp when turned full volume? if so, it is an input/mute issue. The switches these days are rather cheaply made and prone to dirt or corrosion. Try cycling the switches repeatedly. The same with the jacks.

If there is no warranty left- pull the chassis out and under a regular flourescent light, noise test each part of the amp with an insulated screwdriver- just make a contact on discrete transistors, or on the inputs of the IC's and work back towards the input. If it is clean all the way back-it has to be the cable, cable ends or the guitar.

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1 Answer

Behringer ub802 mixer is buzzing even when no input when i hook my head phones into the headphone jack and main output jack

If it buzzes when you have no inputs AND no output leads connected, there is a problem with the power supply... HOWEVER if you have used UNBALANCED output cables instead of the REQUIRED TRS BALANCED output cables, it is possible the noise is being driven backwards and that is what you are hearing. Note that at full gains, there often is a tiny bit of noise, usually hiss. Also make sure the supply is powered from the SAME receptacle as the equipment this drives such as an amp or powered speakers.

Jul 18, 2011 | Behringer Eurorack Ub802 - Ultra Low-Noise...

1 Answer

When i plug it in the lights come on, respond to me pushing buttons, but the sound isn't going through. i tried inputting both a microphone and an electric guitar, and i tried outputting to both a...

Make sure you have the input and output cables to the correct side. The power should come on when you plug in the INPUT cable from teh guitar. A mic MAY have insufficient output to drive this. You may need to use a guitar that has a preamp built in.

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1 Answer

My lexicon alpha is only a year old. line in 1-2 on the back has a distorted humming noise when any device is plugged in. What could be the problem and how could i fix the problem ? Thanks.

The probable cause is a ground loop. You haven't said what you are plugging in. These inputs are BALANCED lines and you MUST use TRS cables driven by TRS outputs of the thing you are driving it with. ALL interconnected equipment MUST be powered by the same receptacle or power source.
IF the thing you are driving it with does not have balanced outputs, then procure a DI (Direct Input) box and use an XLR cablle between the DI and the Alpha and set the DI on ground lift.

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1 Answer

I have a Zoom G2, It has excessive noise. It has the correct power supply and I tried powering it with batteries, but it still produces the loud distorted noise. It worked fine the last time I used it. ...

Check if it might be an intermittent input or output jack by wiggling these. Jackks are notorious for problems. Often the soldering of the jack to the circuit board seperates causing noise.

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I have NS-2 Noise Suppressor Pedal, this works fine but in some moment make a radio noise (hum) and the output signal comes down (like turns the volume to 0) ... I don't know what it is, I'm going to...

The probable problem is poor connections at the input and/or audio output jacks.

Usually the power supply will fail either on or off which is sometimes cause by a bad input power jack.

In any case, the problem is likely internal and will require repair.

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Something has blown?

The output transistors may have shorted and caused a resistor to smoke (literally!!). This should not be too expensive a repair for anyone that works on these amps. Figure on $20-$30 for parts.


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