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3.
For IC U6 — Use a PLCC IC puller to remove the existing firmware IC.
Squeeze the tool to align its hooks with the slots in opposite corners of socket
U6. Insert the hooks, squeeze gently, and pull the IC straight out of the socket.
Set the IC aside.
4.
For ICs U1 and U2 — Use your fingertips to grasp the edges of the existing
firmware IC and pull the IC straight out of the socket. Set the IC aside.
5.
Note the key (notch) of the new firmware IC. Orient the IC to match the key
on the socket, and carefully press the IC in place.
6.
If the controller card was removed from a switcher, reinstall the controller
card, see "Installing the controller card" in this chapter.
Installing the controller card
N The controller cards are hot-swappable. You do not need to power down the
switcher to install a controller card.
1.
If necessary, open and remove the front door.
2.
If necessary, turn the left and right knurled knobs on the fan assembly door
¼-turn counterclockwise. Raise the door and rest it on the roof of the power
distribution enclosure.
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3.
Orient the card to be installed so that the connector is on top (figure 6-11).
4.
Pivot the ejector handle out and away from the center of the card.
5.
Identify the correct location for the card. Align the top and bottom edges of
the card with the guides. Gently slide the card into the cardcage ensuring that
the bottom edge slides into the bottom guide. Continue sliding the card into
the guides until the ejector handle contacts the guide frame.
6.
Gently pivot the ejector lever in and down to seat the card in the power
distribution plane.
7.
If the card installed is a replacement, set the DIP switches on the rear edge of
the card to the same setting as the card that was removed from this location.
8.
Close the fan assembly door and turn the left and right knurled knobs ¼-turn
clockwise.
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9.
Close the front door.
Do not touch the electronic components or the connectors on the power
distribution plane or on the circuit cards without being electrically
grounded. Handle cards by their edges only. ESD can damage ICs, even
if you cannot feel, see, or hear it.
Ensure that you close and secure the fan assembly door when you have
finished this maintenance procedure. The Matrix 12800 may overheat
otherwise.
Matrix 12800 Switchers • Upgrades and Maintenance
6-15
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