Fujitronic Programmable Operation Display UG520H-x - Manual (Page 247)

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10. Open the LCD module by turning it to the left and remove it from the inside case. Place it with the
display panel side down.
Place it on a cloth, etc. to protect the display panel from scratches.
LCD module (rear)
Inside case
11. Hold down the claw, and pull the backlight unit (CFL unit) out horizontally to the left.
Claw
Backlight unit (CFL unit)
12. Attach a new backlight unit (CFL unit).
* Hold down the claw, and insert the backlight unit (CFL unit) horizontally to the right.
When taking a new backlight unit out of the bag, do not twist or yank on
the cable.
7 How to Replace the Backlight Unit