Specifications

CHAPTER
Repair and Replacement 8-1
8
Repair and Replacement
This chapter describes periodic maintenance procedures, troubleshooting procedures, and the
replacement of major parts for the Release 4.1 MGX 8220.
Caution For protection against shock hazard, verify both power cords are disconnected before servicing
unit.
Caution Vergewissern sie sich, däss beide Netzkäbel vom Gerät getrennt sind, bevor Sie mit den
Wärtungsärbeiten beginnen.
Caution Pour iviten tout danger, dibrancher les deux cordons d'alimentation avant toute intervention de
maintenance sur cet equipement.
Preventive Maintenance
Most monitoring and maintenance of the MGX 8220 shelf is done via the operating system software.
Preventive maintenance of the MGX 8220 shelf hardware is minimal and requires the following:
1 Periodically check the node supply voltage and internal cabinet temperature. The temperature
should not exceed 50
°C.
2 Periodically check the event log with the dsplog command.
3 Periodically check the network alarm status with the dspalms command.
4 Ensure that the cooling unit intake grills and the exhaust plenum are clear.
Troubleshooting the MGX 8220 Shelf
This section describes basic troubleshooting steps to be taken for some of the more obvious node
failures. (Refer to Table 8-1.) This is not an exhaustive set of procedures, and does not take into
account any of the diagnostic or network tools available to troubleshoot the MGX 8220 shelf. Refer
to Chapter 5, “Service Configuration”, for information on commands and command usage.