• Remove the two screws using a 3 mm Allen key to take out the defective PCB (red arrows).
• Remove the three screws using the Phillips Screwdriver PH0 to take out the sensor PCB (red circle).
• In case of the Mono Volume 90 remove nuts and washers from the jacks (11 mm nut driver) as well.
Be aware of the 9 washers on the inside of the jacks that ensure proper spacing of the MV 90 PCB.
Unmounted main PCB with disassembled sensor PCB:
