The pinout of the 4-pin connector. Pins 1 & 3 are ground, pins 2 & 4 are +15.5V DC
https://digipres.club/system/media_attachments/files/113/047/664/729/939/644/original/7f7491225d26e408.png
EPSON WHY DID YOU NEED FOUR CONNECTORS FOR A TWO CONNECTOR POWER SUPPLY?
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