Tait TM8100 mobiles Service Manual page 26

>25W 25W
Main Board
>25W 25W
>25W
Heat-Transfer Block
26 Description
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The main board is attached to the heat-transfer block
M3x10 Torx-head screws
auxiliary and RF connectors.
The inner foam D-range seal
heat-transfer block. The power connector seal
against the heat-transfer block.
The power connector seal
seal of the 25W radio (black).
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The main board is a printed circuit board in SMT design with
components on the top and bottom sides. A digital board
soldered to the main board. Most components are shielded by metal cans.
There are different main boards for each frequency band and each RF
output power configuration.
The internal options connector
and the factory connector (not illustrated) for factory use are soldered to the
top side of the main board. The control-head connector
of the radio) and the auxiliary
the rear of the radio) are located on the bottom side of the main board.
The >25W radio has a black power connector
white power connector.
For more information on the connectors, refer to
page 38.
For heat dissipation, one of the screw bosses inside the chassis is in contact
with the underside of the main board. A larger copper plate at the underside
of the main board connects to the body of the heat-transfer block.
The >25W radio has an additional gap pad between the heat-transfer block
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and the main board
bottom side of the main board.
The aluminium heat-transfer block
to the heat fins of the chassis. The heat-transfer block has a contact surface
to the larger copper plate at the underside of the main board
contact surface to the rear of the chassis. All contact surfaces are coated with
thermal paste.
Two self-adhesive foam seals
connector on either side of the heat-transfer block and the power connector
1)
seal inside the aperture of the power connector are fitted to the heat-
transfer block.
B
and the fastening elements
G
seals the auxiliary connector against the
1)
of the >25W radio (blue) is different to the
E
for connecting an internal options board
F 1!
, power and RF
which connects to an additional copper plate at the
H
dissipates heat from the main board
G I
and around the aperture of the auxiliary
© Tait Electronics Limited November 2007
H
with three
J 1# 1$
, and
1)
seals the power connector
D
is reflow-
1&
(facing the front
1%
connectors (facing
1!
and the 25W radio has a
"Connectors" on
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, and a
TM8100/TM8200 Service Manual
of the