146 Disassembly and Re-assembly of Radio TM8100 Mobile Radio Service Manual
May 2004 © Tait Electronics Limited
Important Ensure that the two external screws securing the main-
board assembly are properly tightened; otherwise the
radio will overheat and might be damaged.
Install Main-board
Assembly — Secure
Assembly in Chassis
Complete the installation of the main-board assembly by securing the
assembly in the chassis:
1. Place the main-board assembly in position in the chassis.
2. Screw in the two external screws by hand as far as possible. The
screws are labelled screw 6 and screw 7 in Figure 6.8. Ensure that
the screws start easily and are not cross-threaded.
3. Identify the diagonal edge of the
PAD TOP can. The can is shown
in Figure 6.8.
4. While pressing down firmly on the diagonal edge of the
PAD TOP
can, use a Torx T20 torque-driver to tighten the screws to
2.5 N
·m (22 lbf·in). (If the screws are not tightened properly, the
radio will overheat.) The reason for pressing down on the can is
to ensure that the circuit board is seated correctly on the bosses for
the five internal screws.
5. Clean off any excess thermal paste on the heat-transfer block.
6. Screw in the five internal screws by hand as far as possible. The
screws are labelled screw 1 to screw 5 in Figure 6.8. Ensure that
the screws start easily and are not cross-threaded. Then use a Torx
T10 torque-driver to tighten the screws to 1.9 N
·m (17 lbf·in).
7. Fit the rubber seal for the RF connector; first fit the upper part of
the seal and then press down around the sides of the seal to the
bottom. Ensure that the seal is properly seated around its entire
periphery.
8. In most radios a bung will have been supplied for the auxiliary
connector. In such cases the bung must be fitted again on re-
assembly to ensure that the radio is sealed. In fitting the bung,
ensure that it is not upside down and that it is properly seated.
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