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To replace the printer controller board:
1
Align the printer controller board with the groove on the
back of the printer and carefully slide it back inside the
printer.
2
Tighten the two thumbscrews on the printer controller
board that you loosened earlier, using a cross-point
head (+) screwdriver.
3
Plug in the power cord and reconnect any cables to the
back of the printer.
Printer controller board