HP 9020 Service Manual page 123

Clock Board
Assembly Access 4-23
Reassembly Notes
When installing board, hold by ejectors and use side edge of board to
move air controller out of the way and onto board.
Insert board firmly in stack motherboard and push ejectors in to lock it
in place.
Reinstall processor stack door by first attaching with two thumbscrews at
top of door and then installing two bottom screws. Firmly tighten all
screws to prevent RFI radiation.
1. UNPLUG COMPUTER POWER CORD FROM AC OUTLET.
2. Open left door as previously described.
3. Disconnect lOP expander cables, if present, from processor stack door (Figure 4-17).
4. Loosen two captive thumbscrews on processor stack door (Figure 4-20) and swing door
open, allowing door to rest in open position.
CAUTION
CAREFULLY HANDLE BOARD TO AVOID DAMAGE FROM ELEC-
TROSTATIC DISCHARGE OR OTHER CAUSES. HOLD BY EJEC-
TORS OR SIDE EDGES ONLY. DO NOT TOUCH EDGE CONNEC-
TOR CONTACTS OR BOARD PLANES. IMMEDIATELY PLACE
BOARD IN ANTISTATIC BAG OR ON ANTISTATIC SURFACE.
5. Remove boards in slots 5-12 by pulling out on ejectors to release boards from stack mother-
board and sliding boards out of slots.
6. Loosen two slotted captive screws that hold clock board to stack motherboard (Figure 4-22).
7. Disconnect clock board from processor stack motherboard at inline connector (Figure 4-22).