Technical information

Troubleshooting and Repair
149
Troubleshooting
Replacing a Control Resource Card (CRC)
1. If you have a redundant system, hold down PANEL
ENABLE and press ACTIVITY FREEZE ON.
Power down the control node before removing the
Control Resource card. Powering down the node
takes the system out of service.
2. Power down the main control node (see page 136).
Wear an anti-static wrist strap whenever you handle
circuit cards.
3. If the system has a CRCIII, disconnect the two modular
cables from the faceplate of the card.
4. Slide the CRC out of the cabinet.
5. Remove the system ID module from the connector J1 on
the faulty card.
6. Plug the system ID module into connector J1 on the
replacement CRC. The system ID module can be
installed only one way. Ensure that you align the pins
correctly.
7. Set the DIP switches on the replacement CRC faceplate
to the same settings as those on the faulty CRC.
8. Insert the replacement CRC into its cabinet slot.
9. If the system uses a CRCIII, reconnect the modular
cables to the same ports on the replacement CRC III
faceplate.
10.Power up the main control node (see page 138).