GRAPHTEC GL840 User Manual page 35

CHAPTER 2 Checks and Preparation
(4) Align the wireless LAN unit to the wireless unit terminal and the wireless unit fixed guide and then insert
the wireless LAN unit until the unit is locked.
Wireless LAN unit
When the wireless LAN unit has been inserted, please be careful when handling so as not to hit and drop.
Removing the wireless LAN unit
Turn OFF the power and then remove the wireless LAN unit.
(1) Push the lock part on the wireless LAN unit to unlock, and then remove it.
Lock part
(2) After removing it, mount the SD CARD protective cover to protect the connectors.
Protective cover
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