Konica Minolta Fujitsu Scanner - Manual (Page 134)

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3.8 Cleaning the Lamps
5. Install the Back-lamp unit in the reverse order of its removal. Make sure
that the clear portion of the Lamp faces up.
6. Install the Back-lamp in the reverse order of its removal. Make sure the
connectors meet properly.
7. Close the side cover. Confirm that the latch is closed securely.
ATTENTION
If the Lamp is installed with the clear portion facing incorrect direction, an
error due to insufficient light occurs.