16 Replacing the Network Board TB9100 Reciter Service Manual
© Tait Electronics Limited January 2006
1.4 Removing the Faulty Board
1. Remove the M3 Torx screws securing the cover on the digital side of
the reciter. Lift off the cover. (The digital side is nearest to the 9-way
D and RJ45 connectors.)
2. Remove the two M3 Torx screws that secure the rear panel on the
digital side of the reciter.
3. Disconnect the coaxial cable from the network board and lift off the
bridge board.
4. Disconnect the flexible connector by gently levering up the lugs on
the ends of the latch. The flexible connector springs free.
5. Remove the eight M3 Torx screws that secure the network board to
the heatsink.
6. Carefully lift the network board off the locating pins and remove it
from the heatsink.
Important Flexing the board may damage the PCB tracking or break
solder joints.
If the board is a snug fit on the locating pins, you may have to very
gently lever the board with a screwdriver, beginning at the right-hand
side (as viewed in Figure 1.1), to get it to lift.
1.5 Replacing the Board
Important Be very careful to keep the replacement board scrupulously
clean. The board is densely populated and the smallest par-
ticle of conductive dust can cause a short.
Important Make sure the insulator sheet is correctly positioned and flat
on the heatsink. Although this sheet is an electrical insula-
tor, it is also thermally conductive and must allow the PCB
to sit as flat as possible to provide effective heatsinking.
Operating the reciter without the insulator sheet in
place will result in permanent damage to the digital
or system interface PCBs.
1. Make sure that there is no debris on the underside of the network
board.
2. Position the replacement network board over the locating pins and
press it down over them so that it is firmly seated against the insulator
sheet on the heatsink.
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