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a) Remove the screws from the photometric system support cover.
b) Slightly move the support cover towards the centre of the rotor and remove it from its housing.
c) Disconnect the at band from the photometric system board.
d) Change the board.
e) Ret the support cover in place ensuring that the at band is not folded.
5.1.5.6. Changing the front indicator
a) Remove the upper casing.