Assuming the power in is good (I would check that first though, AC voltage going into the amp), then plug a patch cord(any 1/4" to 1/4") cord into the effects loop on the back of the amp and insert and remove a plug into the headphone jack a number of times to clean the contacts(headphone jacks and effects loop jacks are normally switching jacks that pass audio when not in use). Still not working?... If the pots(gain, volume and tone controls, etc.) are scratchy that could be the issue. The input jack could be the cause(damaged, cracked solder or circuit board trace). Wiggle the input jack to see if that causes or corrects the problem. A little WD-40 works wonders on correcting dirty jack issues. If none of the above are the cause then it is likely a cracked solder joint, trace or component lead which would have to be resoldered/repaired (maybe dirty contacts between the small effects board and the main board). Also watch the overdrive channel LED when the audio drops. If the LED goes off could be a power supply issue or a channel switching issue. Tapping on the amp will help indicate bad connections, cracked component leads or damaged traces.
SOURCE: Marshall MG250dfx's sound fades out
I have read that the problem is in the FX send/return jacks which oxidize if not used much. All you have to do, apparently, is ram a jack plug in and out a bunch of times. This breaks up the oxidation, and allows the amp to work properly again.
SOURCE: ive just purchased a marshall mg250dfx amp and
Since you just purchased this, verify that your guitar and cables are good on another amp and if they are good, then exercise your warranty on the Marshall.
Connectors and cables for guitars are chronic problems so verify they are good to avoid looking foolish.
260 views
Usually answered in minutes!
×