Epson MR Series Technical Reference Manual page 286

To install, reverse the removal procedure.
Note:
When you change the main circuit board, you can use both the CPU and the CPU cooler attached to the
old board. You need not to replace the CPU or the CPU cooler.
CAUTION:
Also, when you place the cable of power supply, put it under the USB cable.
Do not arrange the cable of the power supply near the end of the case. Otherwise, it
may be damaged when you install the IM-800 upper case or the CD/FDD bracket.
Do not arrange the cable of the power supply under the main circuit board. Otherwise,
it may be damaged when you connect the other cables to the main circuit board.
USB cable
Note:
Be sure to connect the cable with blue connector to the blue socket.
One edge of each cable is colored red to help you see the proper orientation of the cables. Please note the
correct orientation in the illustration below.
CD-ROM cable
HDD cable (Blue)
9-70 Disassembly and Assembly
FDD cable
Rev. I