HP Dc7700 HP Compaq dc7700 Business Desktop PC Service Reference Guide, 1st Ed - Page 183

Removal and Replacement Procedures - Ultra-Slim Desktop (USDT) Chassis 8.16 Heatsink Assembly 1. Prepare the computer for disassembly (Section 8.1). 2. Remove the computer access panel (Section 8.3). 3. Remove the optical drive (Section 8.4). 4. Disconnect the three front I/O, fan, and speaker cables from the system board. 5. Remove the front panel assembly (Section 8.5). 6. Disconnect the heatsink fan cable from the system board. 7. Unscrew the four screws that secure the heatsink to the system board, then lift the heatsink with the shroud from the system board. Ä CAUTION: Heatsink retaining screws should be removed in diagonally opposite pairs (as in an X) to even the downward forces on the processor. This is especially important as the pins on the socket are very fragile and any damage to them may require replacing the system board. 8. Lay the heatsink on its top in a safe area to prevent the thermal grease from contaminating the work surface. If resuing the existing heatsink go to step 1. If uisng a new heatsink, go to step 3. 1. If reusing the existing heatsink, clean bottom of the heatsink and apply the thermal grease provided in the spares kit to the top of the processor. 2. Position the heatsink atop the processor 3. If using a new heatsink, remove the protective covering from the bottom of the heatsink and place it in position atop the processor. 4. Secure the heatsink to the system board and system board tray with the 4 captive screws and attach the heatsink control cable and the thermal sensor cable to the system board. Service Reference Guide, dc7700 433612-001 8-21