Fujitronic Programmable Operation Display UG520H-x - Manual (Page 256)

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6. Disconnect the backlight unit (CFL unit) connector.
Hold the connector and pull it out. Do not twist or yank on the cable
then.
7. Remove the 2 screws fixing the board equipped with the backlight unit (CFL unit) connectors.
8. Remove the board equipped with the backlight unit (CFL unit) connectors.
9. Remove the two ribbon cables.
Backlight unit (CFL unit) connectors
Front external case
Ribbon cables
Rear external case
Screw
PC board
Screw
Ribbon cable connector
Ribbon cable
Slide the lock to release it.
Lock
Ribbon cable
Ribbon cable connector
Lock
Slide the lock with the ribbon cable holding down with your fingers.
* The connector and the lock are not removable.
7 How to Replace the Backlight Unit