Preparing Main Logic Board For Replacement - Sun Microsystems SPARCstation 2 Service Manual

13. Disconnect the hard disk drive data (J0401 and J0402) and power cables
(J0702 and J0703) from the data and power connectors on the main logic
board (see Figures 4-25 and 4-26).
Fold them out of the way.
14. With an IC extractor or a small flat-bladed screwdriver, remove the
NVRAM chip (see Figure 4-25 and Table 4-3 for the location of the
NVRAM chip) from its socket slowly and evenly.
15. Store the NVRAM chip in conductive foam or place it on the antistatic
mat to prevent damage from electrostatic discharge.
Save the NVRAM chip for re-use.
16. Remove the two Phillips head screws that secure the board to the back
panel (see Figure 4-26).
17. Slide the main logic board toward the front of the chassis to release it
from the five standoffs in the bottom of the chassis.
18. Grasp the board by the SBus slot connectors with both hands and
carefully lift it out of the chassis.
Avoid handling any of the delicate electronic components or touching any of
the main logic board's traces.
19. Place the main logic board on the anti-static mat.

Preparing Main Logic Board for Replacement

This section explains how to prepare the main logic board for replacement.
To prepare a main logic board for replacement:
1. Remove the NVRAM chip from the replacement main logic board and
place it on the anti-static mat.
2. Insert the NVRAM from the defective board in the replacement board at
the same location.
Match the pin 1 indicator on the NVRAM chip with the indicator on the
socket. Holding the NVRAM chip at the edges, carefully align the pins and
insert the NVRAM chip in the socket. Figure 4-25 and Table 4-3 show the
location of the NVRAM chip on the main logic board.
FRU Replacement
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