TM8100 Mobile Radio Service Manual General Description 47
May 2004 © Tait Electronics Limited
Dissipation of Heat
from Regulator and
Audio PA
Heat from the regulator and audio PA is conducted to the underside of
the chassis via a screw boss on the floor of the chassis. The boss is in
contact with the underside of the PCB where the components are
mounted. A coating of thermal paste on the screw boss ensures the
necessary thermal contact between the boss and the PCB. The coated
area is shown in Figure 2.11.
Dissipation of Heat
from RF PAs and Driver
Heat from the RF PAs and driver is conducted to the cooling fins via a
copper plate and the heat-transfer block. The copper plate is fixed to the
underside of the PCB beneath these components. It is in contact with a
large metal block projecting from the front of the heat-transfer block. A
coating of thermal paste on the plate ensures the necessary thermal
contact between the surfaces. The contact area on the heat-transfer
block is shown in Figure 2.12.
Table 2.3 Parts of the radio body
Index Reference IPN Description Quantity
1 Figure 2.8 303-23166-xx Cover 1
2 Figure 2.8 365-01712-xx Label for cover 1
3 Figure 2.8 349-02067-xx M4 x 16 screw for lid of radio body 4
4 Figure 2.8 362-01115-xx Control-head seal 1
5 Figure 2.9 312-01091-xx Lid of radio body 1
6 Figure 2.9 362-01109-xx Main seal in lid 1
7 Figure 2.9 302-50000-xx Bung for aperture for external options connector 1
8 Figure 2.11 303-11225-xx Chassis of radio body 1
9 Figure 2.11 349-02066-xx Internal M3 x 10 screw for main-board assembly 5
10 Figure 2.11 362-01113-xx Seal for RF connector 1
11 Figure 2.11 349-02067-xx External M4 x 16 screw for main-board assembly 2
12 Figure 2.11 302-50001-xx Bung for auxiliary connector 1
13 Figure 2.12 349-02066-xx M3 x 10 screw for heat-transfer block 3
14 Figure 2.12 308-13147-xx Heat-transfer block 1
15 Figure 2.12 362-01114-xx Rubber seal for power connector 1
16 Figure 2.12 354-01043-xx Lock-nut for auxiliary connector 1 pair
17 Figure 2.12 362-01112-xx Outer foam seal for auxiliary connector 1
18 Figure 2.12 362-01110-xx Inner foam seal for auxiliary connector 1
Note
The characters xx in an IPN stand for the issue number. Items in the radio body will always be the latest issue
at the time the radio body is manufactured.
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