IBM 9080-M9S Manual page 506

Figure 435. Removing the UPIC cable from the system control unit
3. Remove the power interface card.
a) Place one finger against the right front of the blue touch point latch (A) as shown in the following
figure, and place another finger against the rear of the latch (B).
b) Push against the front of the latch (A) and then pull the latch out from the rear (B). This action
releases the latch.
c) Rotate the power interface card handle in the direction shown in the following figure to unlock the
card from its slot.
d) Hold on to the power interface card handle and use your hand to support the bottom of the card as
you pull the card out from its slot as shown in the following figure.
500 Power Systems: Removing and replacing parts in the 9080-M9S system