Ricoh PJ WU6181N 6200-Lumen WUXGA LCD Projector (No Lens) - Manual (Page 184)

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6. Installation and Connections
6. Close the filter cover.
After closing, push the filter cover near the buttons until a “click”
sound is heard. The filter cover will be secured in position.
Button
To remove the wireless LAN unit
1. Remove the filter unit following steps 1 to 3 above.
WIR ELE SS
WIRE
LES S
2. Remove the wireless LAN unit.
If the wireless LAN unit is hard to remove, place a cloth, etc., over
needle-nose pliers to grasp the wireless LAN unit and pull it out.
NOTE: Do not grasp the wireless LAN unit with excessive force. Doing so will damage it.
3. Mount the filter unit and filter cover as described in steps 5 and
6 above.