Essilor AKR 750 - Page 26

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7-14 Kerato LED does not light up.
The main causes when Kerato LED does not light up:
・ Failure of Kerato LED board, the optical control board
・ Failure of the main control board
NO
NO
Replace the main control board.
OK
Does Kerato LED light up?
OK
YES
Replace the optical unit ASSY.
Does Kerato LED light up?
OK
YES
Replace the optical control board.
Kerato LED does not light up.