Troubleshooting The Mx960 Dpcs - Juniper MX960 Hardware Manual

If a fan tray is removed, a yellow alarm and a red alarm occur.
The following conditions automatically cause the fans to run at full speed and also trigger the indicated
alarm:
A fan fails (red alarm).
The router temperature exceeds the "temperature warm" threshold (yellow alarm).
The temperature of the router exceeds the maximum ("temperature hot") threshold (red alarm and
automatic shutdown of the power supplies).
RELATED DOCUMENTATION
MX960 Alarm LEDs and Alarm Cutoff/Lamp Test Button | 18
Replacing an MX960 Fan Tray | 456
Maintaining the MX960 Air Filter | 592
Maintaining the MX960 Fan Trays | 592

Troubleshooting the MX960 DPCs

Problem
Description: The DPCs are not functioning normally.
Solution
Monitor the green LED labeled OK above the DPC on the craft interface as soon as a DPC is seated in
an operating router.
The Routing Engine downloads the DPC software to it under two conditions: the DPC is present when
the Routing Engine boots Junos OS, and the DPC is installed and requested online through the CLI or
push button on the front panel. The DPC then runs diagnostics, during which the OK LED blinks. When
the DPC is online and functioning normally, the OK LED lights green steadily.
Make sure the DPC is properly seated in the midplane. Check that each ejector handle has been turned
clockwise and is tight.
Check the OK/FAIL LED on the DPC and OK and FAIL DPC LEDs on the craft interface. When the DPC
is online and functioning normally, the OK LED lights green steadily.
Issue the show chassis fpc command to check the status of installed DPCs. As shown in the sample
output, the value Online in the column labeled State indicates that the DPC is functioning normally:
user@host> show chassis fpc
657