Chapter 28: Monitoring the PCG
Step 2: Check the PCG Fuses
Action Check the PCG fuses to check for failure.
The M40e and M160 router fuses are located in a fuse box at the rear of the midplane, behind the lower rear impeller assembly. You must remove the lower impeller assembly to access the fuses, as described in the appropriate router hardware guide.
When the fuse for an PCG blows, the PCG stops functioning even though it is installed correctly and the power supplies are providing power to the router.
For the M40e and M160 routers, when a fuse has blown but the power supplies are still delivering power to router, the amber LED adjacent to the fuse lights. See
Figure 155.
Figure 155: M40e and M160 Router Fuses
J243
A B C D
J242
A B C D
J244
A B C D
J241
A B C D
J240
FPC2 15A
FPC1 15A
FPC0 15A
PCG0 1A
A
B
C
D
Another indication that a fuse has blown is that the colored indicator bulb inside it becomes visible through the clear cover on the fuse. For information about the indicator bulb color for each fuse type, see the appropriate router hardware guide.
A blown fuse can cause a component to fail even though it is correctly installed and the power supplies are functioning. Check for a blown fuse in the following circumstances:
!
The LED that indicates normal operation for the component fails to light.
!
The appropriate CLI show chassis environment command indicates that the component is installed but is not receiving power.
Verifying PCG Failure !
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JUNOS Internet Software Network Operations Guide: Hardware
Step 3: Perform a PCG Swap Test
CAUTION: Before performing a swap test, always check for bent pins in the midplane and check the PCG for stuck pins in the connector. Pins stuck in the component connector can damage other good slots during a swap test.
Action To perform a swap test on a PCG, follow these steps:
1.
Have an antistatic mat ready.
2.
Attach an electrostatic discharge (ESD) wrist strap to your bare wrist, and connect the wrist strap to one of the two ESD points on the chassis.
3.
Remove the rear component cover by loosening the screws on the corners of the cover and pulling it straight out from the chassis.
4.
Press the offline button on the faceplate of the PCG and hold it down until the
Red FAIL LED lights (about 3 seconds).
5.
Loosen the thumbscrew on the right side of the PCG.
6.
Grasp the thumbscrew and slide out the PCG.
7.
Align the rear of the PCG with the guides inside the chassis.
8.
Slide the PCG all the way into the card cage until it contacts the midplane.
9.
Tighten the thumbscrew on the right side of the PCG faceplate.
10. Verify that the PCG is properly installed by looking at the LEDs on the PCG faceplate. The green OK LED should light steadily.
Getting PCG Hardware Information
Steps To Take To get the PCG hardware information, follow these steps:
1.
Display the PCG Hardware Information on page 379
2.
Locate the PCG Serial Number ID Label on page 379
378 !
Getting PCG Hardware Information
