The most critical aspect of the JDM design is creating the 13V programming voltage without an external power brick.

The vias for the face buttons are identical in location to the JDM-050. Analog Stick Pinout Standard 3-pin potentiometers are used for X and Y axes: Resistance: Typically 10k or 30k ohm.

Beyond repair, the schematic enables ambitious modifications:

The schematic showed each analog stick as a pair of potentiometers (X and Y axis). For the left stick, J1 pins 1, 2 (X) and 3, 4 (Y). Alex followed the lines: stick pins went to resistors ( R10 , R11 ) then straight to the main chip U1 (the custom Sony microcontroller).

If your JDM-055 won’t charge and the battery is known good, check R75 and R76. An open resistor here kills charging current detection.

Jdm 055 Schematic - __link__

The most critical aspect of the JDM design is creating the 13V programming voltage without an external power brick.

The vias for the face buttons are identical in location to the JDM-050. Analog Stick Pinout Standard 3-pin potentiometers are used for X and Y axes: Resistance: Typically 10k or 30k ohm. Jdm 055 Schematic

Beyond repair, the schematic enables ambitious modifications: The most critical aspect of the JDM design

The schematic showed each analog stick as a pair of potentiometers (X and Y axis). For the left stick, J1 pins 1, 2 (X) and 3, 4 (Y). Alex followed the lines: stick pins went to resistors ( R10 , R11 ) then straight to the main chip U1 (the custom Sony microcontroller). If your JDM-055 won’t charge and the battery

If your JDM-055 won’t charge and the battery is known good, check R75 and R76. An open resistor here kills charging current detection.

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