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Chapter 11 Replacing a Server or Replacing Individual Components 11-9
11.5 Replacing the NVRAM Chip
Caution – The procedure below is for the attention of qualified service engineers
only. Before touching or replacing any components inside the server, disconnect all
cables and follow the instructions in Section 4.2, “Opening the Server” on page 4-4
which tell you how to open the system. Always place the system on a grounded ESD
pad and wear a properly grounded antistatic wrist strap.
The NVRAM chip on the server’s system board contains a lithium battery that in
time may need replacing. If you see the following message on your console when
you boot the server:
Warning -- Real-Time-Clock (and NVRAM) battery is low
order a new NVRAM chip (part number: F100-6889) from your local Sun sales
representative. Take note of the caution below.
Caution – There is a danger of explosion if the NVRAM chip is incorrectly replaced.
Replace it only with a component of the same type as the used one (part number
F100-6889). To replace the chip, follow any instructions supplied with the new
component. Dispose of the used component according to the manufacturer’s
instructions.
The NVRAM chip is located in a carrier between the rear fan subassembly and the
DIMM sockets on the system board (see
FIGURE 11-4). To replace it:
1. Make a note of the current settings of the environment parameters diag-switch?
and diag-level. You will need these values to carry out Step 5.
To check the setting for
diag-switch?, type:
To check the setting for
diag-level, type:
ok printenv diag-switch?
ok printenv diag-level