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Chapter 12 Troubleshooting Hardware Components 79
Overview of Troubleshooting Resources ........................................................79
Juniper Networks Technical Assistance Center ........................................79
Command-Line Interface ........................................................................79
Chassis and Interface Alarm Messages ....................................................80
Alarm Relay Contacts ..............................................................................80
LEDs .......................................................................................................80
Craft Interface LEDs .........................................................................80
Component LEDs .............................................................................81
Troubleshooting the Cooling System .............................................................82
Troubleshooting DPCs ...................................................................................83
Troubleshooting the Power System ...............................................................84
Chapter 13 Replacing Hardware Components 87
Field-Replaceable Units (FRUs) ......................................................................87
Tools and Parts Required ..............................................................................88
Replacing the Craft Interface .........................................................................89
Removing the Craft Interface ..................................................................89
Installing the Craft Interface ....................................................................90
Replacing Alarm Relay Wires ..................................................................91
Disconnecting the Alarm Relay Wires ..............................................91
Connecting the Alarm Relay Wires ...................................................92
Replacing Cooling System Components ........................................................92
Replacing the Fan Tray ...........................................................................92
Removing the Fan Tray ....................................................................92
Installing the Fan Tray ......................................................................93
Replacing the Air Filter ...........................................................................94
Removing an Air Filter .....................................................................94
Installing the Air Filter ......................................................................95
Replacing Host Subsystem Components .......................................................96
Taking the Host Subsystem Offline .........................................................96
Replacing an SCB ....................................................................................97
Operating and Positioning the SCB Ejectors .....................................98
Removing an SCB .............................................................................99
Installing an SCB ............................................................................100
Replacing a Routing Engine .........................................................................102
Removing a Routing Engine ..................................................................102
Installing a Routing Engine ...................................................................103
Replacing Connections to Routing Engine Interface Ports ...........................104
Replacing the Management Ethernet Cable ...........................................105
Removing the Management Ethernet Cable ...................................105
Installing the Management Ethernet Cable .....................................105
Replacing the Console or Auxiliary Cable ..............................................105
Disconnecting the Cable from a Management Console or Auxiliary
Device ......................................................................................105
Connecting the Cable to a Management Console or Auxiliary
Device ......................................................................................106
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MX240 Ethernet Services Router Hardware Guide