Removing the Card Cage Cover
4-48 72A-1230 Rev. F
July 22, 2005
Removing the Card Cage Cover
The card cage cover must be removed to gain access to any of the following
components:
• DSP/CPU Board
•Guard Board
• Guard Mode Switch Board
• Safety Board
• Timing Board
NOTE These PC boards are sensitive to static electricity. Observe the following
precautions when handling them.
The following precautions significantly reduce the possibility of damaging a
board through electrostatic discharge (ESD):
• Before handling a PC board, discharge your body’s static charge by
wearing a wrist strap or touching a grounded surface.
• Do not remove a replacement board from its anti-static packaging until
it is ready to be installed.
• Handle boards by their edges and their extractors (clips). Avoid
touching components on the board and any edge connectors that plug
into backplane slots.
Take the following steps to remove the card cage cover:
1. Remove the four screws that attach the card cage cover to the left outside
wall of the unit using a Phillips head screwdriver.
2. Remove the three screws on the top of the card cage cover using a
flat-blade screwdriver.
3. Lift the cover off.
A top view of the card cage appears in Figure 4.24.