HP Integrity rx8620 Server User Service Guide

Figure 6-41 Machined Heatsink and Clip
9. On the machined heatsink: note the fan power cable routing and unhook the fan power
cable from the clip on the heatsink fin. Care should be used not to break the clip.
On the soldered heatsink: note the power cable routing and remove the clip by sliding it up
and off the heatsink fin. Remove the power cable from the clip and set the clip aside.
Replacing a Turbo-Cooler Fan
To replace a turbo-cooler fan, follow these steps:
1. Position the new fan with the power cable routed toward the clip.
2. Seat the replacement fan in the turbo-cooler by pressing down on the center of the fan. You
should hear a snap when each of the two tabs engage.
3. Route the cable carefully through the fins of the heatsink without leaving excess slack inside
which could impede the fan.
On the soldered heatsink: after routing the cable, slide the clip onto the fin immediately next
to where you routed the cable.
4. Secure the power cable in the clip. The fan spins freely when seated properly with the fan
power cable secured in the clip.
5. Plug the fan power cable into the cell board.
6. If so equipped, replace the CPU cover and tighten all the captive screws.
7. If removed, replace the DIMM cover and tighten all the captive screws.
8. Replace the cell board in the cabinet.
9. To return 48V power to the cell board, use the MP:CM> PE option C.
10. To boot the partition, use the MP:CM> bo option.
Removing and Replacing a Voltage Regulator Module
There are a total of 15 voltage regulator modules (VRMs) located on the cell board. Both low
voltage VRMs and high voltage VRMs reside on the cell board.
Physical Identification for a VRM
There are three methods to visually determine if a VRM is a low or high voltage VRM:
Markings Low voltage VRMs are marked “0.88–1.9V” while high voltage VRMs are marked
“1.75–3.3V”.
Key Pin Low voltage VRMs have the key pin located near the center of the connector while
high voltage VRMs have the key pin near the edge of the connector.
Heatsink Low voltage VRMs have a smaller heatsink while high voltage VRMs have a larger
heatsink.
Removing and Replacing a Voltage Regulator Module 155