Question about Marshall MG100HDFX 100-Watt Amplifier Head
Chances are a power transistor has shorted. Sometimes input rectifier diodes short or electrolytic caps.
Here is a hint to troubleshoot this: Connect a 150 watt lamp in series with the hot side of the power line to the amp. This will limit the current (and voltage) and prevent the fuse from blowing. You can do a lot of troubleshooting at the much reduced voltage.
If board is burnt to carbon, this "cancer" needs to be cut out and removed as the blackened board is slightly conducive instead of an insulator. Often a circuit trace has fried the board. One must install jumpers around ones that have smoked.
Posted on Sep 24, 2009
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Posted on Jan 02, 2017
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