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19. Remove the processor-cooling fans as described in "Fan assembly removal" on page 334.
20. Remove the processor-cooling-fan-cage assembly by completely removing the two hex-head screws
located at the base of the cage. You have to open the processor-fan-access cover to see these two
screws. These two hex-head screws have thread-lock on them and should be kept separate from the
other screws. Also, remove the eight hex-head screws that screw in from the back of the system
chassis.
21. Remove the 16 threaded 5-mm standoffs that secure the back connectors located on the CEC
backplane to the back of the system chassis.
Note: Only the two standoffs on serial port 2 have lock washers. The four standoffs on SPCN1 and
SPCN2 are not ribbed. The other 10 have a grooved rib around them.
22. Remove the power supply and processor-assembly-front-support bracket.
Note: The bracket is secured to the system chassis with 13 hex-head screws: five screws on the
power supply support section, three screws on the processor support section, and five on the
front of the chassis in the area of the processor support.
23. Unplug the operator panel and debug test port cables from the CEC backplane.
24. Remove the CEC backplane retaining screws. All but two screws, including standoffs, have
thread-lock on them and should be keep separate. The other two screws are round-head and are
used for frame ground. The pads on the CEC backplane have "FG" printed beside them.
Note: For the locations of the retaining screws, see the following CEC backplane illustration.
Note: Use care when removing the CEC backplane. Standoffs attached to the chassis base might
damage the components attached to the bottom of the CEC backplane.
25. Slide the CEC backplane toward the front of the system (about 7 mm). A strip of sponge rubber
attached to the back (bottom) of the CEC backplane will compress against an aluminum plate that is
secured to the system chassis, preventing the CEC backplane from traveling forward any farther. This
action allows the connectors located on the back of the CEC backplane to have enough room to clear
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NAS Gateway 500 Service Guide
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