FUJITSU IMAGE SCANNER FI-486PRRE - Manual (Page 105)

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3.8 Cleaning the Lamps
3. Rotate the Lamp a half turn so that the terminals on each end align with the slot on
the Lamp socket and remove the Lamp from the unit.
4. Clean the clear portion of the Lamp with a dry cloth.
Lamp socket
Backside lamp unit
Clear portion