Jymc220bi Schematic 2021 !!top!! -

: Replace C9, C15, and R23 with correct value components. Also verify all potentiometers are clean and functional.

Inspect the onboard ceramic fuse. If it blown violently (blackened glass), it indicates a direct short downstream. jymc220bi schematic 2021

Since official sources do not exist, here is a practical roadmap: : Replace C9, C15, and R23 with correct value components