Removal and replacement procedures 46
Replacing the processor
CAUTION: To allow the heatsink to draw away as much heat as possible from the processor, there
must be a tight connection between the heatsink base and the top of the processor. To ensure this
connection , a thermal grease compound must be used.
To replace or install a processor:
1. Using a clean cloth dipped in rubbing alcohol, clean t he surface of the heatsin k b a se (contact
area) and the top of new processor. Ensure that both surfaces are clean and that no particles or
dust contaminants are evident.
2. Apply the thermal grease compound to the top of the processor (the contact surface).
CAUTION: HP recommends thermal grease of X-23-7783D made by Shin-Etsu.
3. Use the edge of a razor blade to spr ead the grease throughout the en tire contact surface and
lightly scrap e off any excess g r ease. Make sure that you only apply a very thin layer so that the
contact sur f ace is still visible.
CAUTION: Never touch the contact area of the processor. Any contaminant could prevent the
mounting pads from making contact with the socket.
CAUTION: Applying too m uch grease crea t es a gap between the contact surfaces, significant l y
reducing the abilit y of t h e cool er t o draw out heat. Installing th e cooler with excessiv e grease can
also cause t h e g r ease to spread ov er the processor pi ns or the system board base, which can cause
electrical shorts that damage the system.
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