TX2560 M2 / RX2560 M2 Upgrade and Maintenance Manual
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Basic hardware procedures
Figure 48: Installing the riser module - example riser module 1
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Fasten the riser module with four screws at the rear side (see circles).
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Tighten the screws not too firmly.
Please do not tighten the screw with force when you tighten the screw 
of the slot cover lock. The slot cover lock might come off.