HID DTC400E/C30E/M30E User Guide - Manual (Page 70)

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DTC400e/Persona C30e/M30e Card Printer User Guide (Rev. 1.1) 4-23
7 Remove the rear cover in order to check that the Ribbon Encoder Sensor is
securely connected to the J-4 Main Board connection and to the Encoder
Sensor.
a. Press on the Resume button.
b. If the issue persists, replace the Encoder Sensor.