72Installation and Service Guide: Color Controller E-85
Replacing parts
1 Prepare the surfaces of the CPU and CPU cooling assembly for proper thermal conduction:
• If you are installing a new CPU cooling assembly, make sure that fresh thermal compound is present on the base of
the new heatsink. New cooling assemblies ship with thermal compound preapplied to the base of the heatsink.
2 Place the cooling assembly on the CPU (see Figure 37 on page 70).
Align the four mounting screws in the cooling assembly with the four mounting holes in the motherboard. Make sure
that the thermal compound on the base of the assembly completely covers the CPU chip. Incorrect installation could
cause the CPU to overheat.
3 Tighten the four screws to secure the cooling assembly to the motherboard.
To avoid flexing and possibly damaging the motherboard, partially tighten each screw before you tighten any one screw
completely.
4 Connect the CPU fan cable to its designated connector on the motherboard (see page 58).
5 Reassemble the E-85 and verify its functionality (see page 83).
6 If you installed a new CPU, configure the time and date in Setup.
For more information, see Configuration and Setup, which is part of the user documentation set.
Back Fan
Inside the E-85, one back fan runs continuously when the system is on. The fan circulates air inside the E-85 to cool
integrated circuits within the system. You should hear the fan start as soon as you power on the E-85. If you do not hear the
fan, the most likely problem is a faulty cable connection (see Figure 25 on page 47).
Replace the Back fan
The following procedures describe how to remove and replace the back fan.
To remove the back fan
1 Shut down the E-85, remove all cables from the back, and then open the system (see page 48).
To access the fan, you must remove the left panel.
2 Detach the 3-pin fan cable connector from its connector on the motherboard.
Important: If you removed the original CPU cooling assembly from the motherboard to install it on a new
motherboard, first remove all thermal compound residue from the surface of each CPU and the base of each
heatsink. (Use the flat edge of a non-conductive tool to scrape off the residue, and a lint-free cloth moistened with
alcohol to clean the base of the heatsink.) Then apply fresh thermal compound to the surface of each CPU using
the applicator provided with the new motherboard.
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