Question about Marshall 15 Watt Guitar Amp

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While playing, the volume cuts up and down in all the channels.

GCM900 head

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  • Marshall Master
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Fiirst check if your input connector is bad. Move the cable right at the connector and see if the volume jumps... HOWEVER before doing that even, verify your guitar is not the problemm using another amp.

If it is definetly the Marshal, it will likely need servicing.

It could be a bad volume control or a cracked circuit board.

Posted on Feb 03, 2010

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When setting up xr8600 is it best to start mains and monitors master at 0DB?


1. Turn the main and monitor volumes all the way down (off). Plug a cd player into channel 9/10 and play a track of music of your liking. With the main/monitor volumes still off, adjust the gain on 9/10 until the clip light turns on, then back it down until the clip light just turns off. Put the channel volume at 12 o' clock.
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4. Set up microphone - plug a mic into channel 1 with volume all the way down. Speak or sing into the microphone and adjust the GAIN until you see the clip light, then back down a litttle on the gain. Put the monitor and main volumes back up to the mark from step 2. Now adjust the volume and monitor send on the mic channel to the desired loudness first before adjusting the mic channel eq. Use subtractive eq method to minimize distortion and feedback. ...i.e. if the mic is bassy then turn down the lows, do not ADD highs. If the mic needs bass, turn down the highs.

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1 Answer

Right channel cuts out when I increase the volume


Blown or defective Headphone Amp IC or alternatively a defective Pot. Either way only AVID can fix it for you.

Outside parts and service is impossible.

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You may have damaged the variable resistors (the volume controls), you can purchase replacements from a local Electronics store (if UK based try Tandy). Otherwise have you checked the speaker itself for damage? You may have split the speaker which will need to be replaced.

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Have you tried connecting a single speaker to each output and cutting the volume down to see if you have a load or impedance problem? The amp may be perfectly fine except it's trying to play to a 2 ohm or less load :-)

Carl

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Plug a set of headphones into the EFFECTS SEND jack... only one side will have sound... now see if the level varies at that point... Note that the soumd will not be too loud and only in one ear... but we are wanting to find out if it varies at this point.

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You have a broken solder joint. You'll have to disassemble the amp enough to get at the soldered side of the circuit board that the controls are mounted to and touch up any suspect solder joints. Just be sure to resolder only the joints that were originally soldered or need to be soldered. Hope this helps.

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