Brother D001CJ001 LT paper feed sensor PCB assembly is a replacement component for the LT paper feed unit in compatible Brother printers. It is identified in the parts manual as a paper feed sensor PCB assembly, making it the relevant part for servicing that paper feed unit.
The manual lists it for HL-L5100DNT, HL-L5200DWT, HL-L6200DWT, HL-L6300DWT and HL-L6400DWT. This model-specific listing helps distinguish it from other sensor boards used elsewhere in the printer. The documented part number is D001CJ001.