Sun Microsystems SUN BLADE 150, Service Manual

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8-4 Sun Blade 150 Service Manual • June 2002
3. Gently place the CPU onto the socket and ensure that the pins are correctly
aligned.
4. Push the CPU locking lever down to lock the CPU in place.
Caution –
The grounding ring is precisely formed to fit the CPU. If you bend the
grounding ring, it may not properly ground the EMI. Additionally, a bent grounding
ring can interfere with CPU cooling. Be sure to position the grounding ring correctly.
See
FIGURE 8-1
.
5. Gently place the EMI grounding ring over the CPU.
Ensure that the grounding ring seats correctly on the CPU.
6. Gently press the grounding ring legs into the motherboard
7. Place the heatsink and fan assembly over the CPU and grounding ring.
8. Attach the heatsink retaining clip:
a. Press the back of the heatsink retaining clip over the plastic tabs on the back of
the CPU socket.
b. Press front of the clip over the front plastic tab on the CPU socket.
9. Reconnect the fan power connector at J-22 on the motherboard (
FIGURE 8-1
).
Note – Read the documentation that is provided with the new CPU to determine
the correct jumper settings.
10. Verify that the motherboard CPU mode detect jumper, JP3, is set correctly.
Note –
A jumper switch is closed (sometimes referred to as shorted) with the plastic
cap inserted over two pins of the jumper. A jumper is open with the plastic cap
inserted over one, or none of the jumper pins.
FIGURE 8-2
shows the jumper settings for the 650 MHz and 550 MHz CPUs.
FIGURE 8-2
JP3 OpenBoot PROM Jumper Settings for 650 MHz and 550 MHz CPUs
1
3
650 MHz CPU
2
550 MHz CPU
2 3 1
Motherboard jumper JP3