Technical information

Technician’s Handbook
146
Replacing Circuit Cards
Hazardous voltages can exist on installed peripheral cards
even when power is removed from the system. Grasp cards
by the lock latches only. Do not touch the sides of cards.
You can replace peripheral interface or DSU cards while the
node is operating.
Removing a Card
1. Enter:
BUSY <PLID of faulty card>
Select the COURTESY DOWN option.
2. To confirm that all circuits are in the busy state, enter:
STATE <PLID of faulty card>
Wear an anti-static wrist strap whenever you handle
circuit cards.
3. Pull the upper and lower latches outward until they are
both in the horizontal release position.
4. Draw the card toward you.
5. Immediately place the card in an anti-static bag.
Installing a Card
1. For cards that have switches, refer to the card’s hard-
ware description for information about switch settings.
Wear an anti-static wrist strap whenever you handle
circuit cards.
2. Check the connector pins to be certain that they are
straight.
3. Slide the card into the slot.