Fixing JCM2000 Bias Drift – Installing Brad’s Guitar Garage PCB (Part 1)

The Marshall JCM2000 DSL 100 is a killer amp — but it's plagued by the infamous bias drift problem. In this two-part series, I fix the issue by installing a drop-in replacement PCB from ‪@BradsGuitarGarage‬ . This board addresses the thermal instability that causes fluctuating bias, a known design flaw in the JCM2000 series. In this video I will remove the old PCB, install the new PCB, and do an initial power up to ensure everything is connected properly. Subscribe for Part 2, where I go through voltage checks, biasing, and a full sound test. FYM2000 PCB by Brad's Guitar Garage:    / @bradsguitargarage   Thanks to Brad for designing such a clean, drop-in fix for these amps! 00:00 Intro 01:53 New New PCBs 03:05 Inside the Amp 04:43 Removing the Rear Panel PCB 06:17 More Labeling 08:26 A Little Recap 09:44 Some Extra Screws 10:26 Out with the Old 12:41 Reconnecting Everything 19:51 All Together Now 20:04 Initial Power Up and Final Thoughts 📌 SUPPORT THE BENCH: If this repair or the schematics saved you time, consider supporting future teardowns! 👉 Get the full parts list & diagrams for repair projects over on my blog: https://technology-enterprises.com/be... 👉 Consider throwing a few bucks in the tip jar: buymeacoffee.com/technologyenterprises 👉 Join as a YouTube Channel Member right here for early access to upcoming videos or to get your name featured in the credits! #jcm2000 #marshallamps #dsl100