Marshall Vavlestate 2000 AVT100 Static Discharge Damage

[TREX625]

Marshall Vavlestate 2000 AVT100 (120vac USA) Static Discharge Damage

I did a dumb thing and plugged my patch cord into the amp while the amp was powered-on and a GIANT static discharge zapped my amp! The amp still works (kinda) but there's a very very distorted / overloaded sound if I strum heavy on both clean and distorted channels.


There was a Mfg Engineering Change Notice to add 2 anti-series zener diodes on the input on later models to guard against this but its too late for my amp. I have the amp schematics but I was hoping someone had a similar issues and knows what components need to be replaced so that I don't have to hunt-n-peek at it for weeks.

Thanks!

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[Enzo]

Why take weeks?

You stuck a static-ed cord into the input? OK, what does that connect to?

Zeners or not, your input comes from the tip contact to CNF1 on the jack board. And the sleeve contact has a cutout wired to CNF2. Where do they go? Schematic says to front board. The path through CNF1 goes through some cap and resistor stuff to end at IC1. The path through CNF2 leads DIRECTLY to IC6a.

If something was zapped, my money is on them, more likely IC6.