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M20D Major fault - mic pres dead loud crackling


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Symptoms:

 

No input levels register on mic pres, with either dynamic or condenser mics

Loud crackling noise (sounds like something frying) as system (V1.20) launches

Crackling noise appears on both headphone and main outs

 

Have done a system reset and firmware reload. No change.

 

Looks like a board failure.... :( :(

 

 

 

 

 

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For anyone else who experiences these symptoms. We appear to have traced the cause to a bad joint inside a molded IEC power supply plug. This was 'arcing' slightly and obviously causing major line interference and a drop in voltage.  Not obvious, but changing the cable and taking the old one apart revealed the damage. Just for reference.

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