Replacing an MX240 SCB
Before replacing an SCB, read the guidelines in Operating and Positioning the MX240 SCB Ejectors.
Removing an MX240 SCB
To remove an SCB (see Figure 1):
 | Note: You can remove the SCB and Routing Engine as a unit, or remove the Routing Engine separately. |
 | Caution: Before removing an SCB, ensure that you know how to operate the ejector handles properly to avoid damage to the equipment. |
| Caution: Before you replace an SCB, you must take the host subsystem offline. If there is only one host subsystem, taking the host subsystem offline shuts down the router. |
- Take the host subsystem offline.
- Place an electrostatic bag or antistatic mat on a flat, stable surface.
- Attach an electrostatic discharge (ESD) grounding strap to your bare wrist, and connect the strap to one of the ESD points on the chassis.For more information about ESD, see Preventing Electrostatic Discharge Damage to an MX240 Router.
- Rotate the ejector handles simultaneously counterclockwise to unseat the SCB.
- Grasp the ejector handles, and slide the SCB about halfway out of the chassis.
- Place one hand underneath the SCB to support it, and slide it completely out of the chassis.
- Place the SCB on the antistatic mat.
- If you are not replacing the SCB now, install a blank panel over the empty slot.
Figure 1: Removing an SCB
Installing an MX240 SCB
To install an SCB (see Figure 2):
- Attach an electrostatic discharge (ESD) grounding strap to your bare wrist, and connect the strap to one of the ESD points on the chassis.For more information about ESD, see Preventing Electrostatic Discharge Damage to an MX240 Router.
- Carefully align the sides of the SCB with the guides inside the chassis.
- Slide the SCB into the chassis until you feel resistance, carefully ensuring that it is correctly aligned.
- Grasp both ejector handles, and rotate them simultaneously clockwise until the SCB is fully seated.
- Place the ejector handles in the proper position, horizontally and toward the center of the board.
- Check the LEDs on the SCB faceplate to verify that
it is functioning normally.
- The green OK/FAIL LED should light steadily a few minutes after the SCB is installed.
- If the OK/FAIL LED is red, remove and install the SCB again. If the OK/FAIL LED still lights steadily, the SCB is not functioning properly. Contact your customer support representative.
- Check the status of
the SCB using the show chassis environment cb command:
user@host> show chassis environment cbCB 0 status: State Online Master Temperature 25 degrees C / 77 degrees F Power 1 1.2 V 1198 mV 1.5 V 1508 mV 1.8 V 1830 mV 2.5 V 5059 mV 3.3 V 6593 mV 5.0 V 5111 mV 12.0 V 12181 mV 1.25 V 1250 mV 3.3 V SM3 6587 mV 5 V RE 5078 mV 12 V RE 12026 mV Power 2 11.3 V bias PEM 11253 mV 4.6 V bias MidPlane 4827 mV 11.3 V bias FPD 11408 mV 11.3 V bias POE 0 11446 mV 11.3 V bias POE 1 11408 mV Bus Revision 6 FPGA Revision 0 CB 1 status: State Online Standby Temperature 26 degrees C / 78 degrees F Power 1 1.2 V 1211 mV 1.5 V 1517 mV 1.8 V 1817 mV 2.5 V 2507 mV 3.3 V 3312 mV 5.0 V 5136 mV 12.0 V 12142 mV 1.25 V 1260 mV 3.3 V SM3 3306 mV 5 V RE 5085 mV 12 V RE 11968 mV Power 2 11.3 V bias PEM 11369 mV 4.6 V bias MidPlane 4814 mV 11.3 V bias FPD 11427 mV 11.3 V bias POE 0 11350 mV 11.3 V bias POE 1 11330 mV Bus Revision 39 FPGA Revision 1
Figure 2: Installing an SCB
