Acer Altos R920 Series - Manual (Page 103)

85
To remove the I/O expansion module:
1 Perform the pre-installation instructions described on page 39.
2 Rotate the retention latch on the rear of the I/O expansion module
slot upward (A).
3 Pull the board away from the chassis (B).
4 Store the board in an antistatic bag.
5 Observe the post-installation instructions described on page 40.
A
B