Fujitronic Programmable Operation Display UG520H-x - Manual (Page 269)

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Visually check that all connectors and ribbon cables are connected se-
curely.
9. Attach the rear external case to the front external case.
* Fit the rear external case in position. Press the case entirely so as to fit the power supply board
connector with the CPU board connector inside.
Do not allow the cable to be caught in the area between the cases.
Power supply board connector
CPU board connector
Rear external case
Front external case
Rear external case
Screws
10. Attach the external 4 screws.
7 How to Replace the Backlight Unit