Tait TP9100 - Page 22

22 Description TP9100 Service Manual
© Tait Electronics Limited May 2005
Speaker
The speaker 1#, which is also used as the microphone, sits inside a recess of
the front-panel assembly, where an adhesive speaker cloth
1! is fixed to the
speaker grille. An adhesive speaker ring
1@ and a speaker clamp 1$ hold the
speaker in position. For correct orientation, alignment features are provided
at the top of the speaker and the front-panel assembly
B. The top end of the
speaker clamp is held in place by a recess inside the front-panel assembly, and
the bottom end is fastened to a screw boss with a screw
1%.
Two speaker contacts connect to two spring-loaded speaker pins on the
main board
2#. The speaker is earthed by a flexible tab on the main-shield
assembly
2) which presses on the speaker chassis.
Keypad The 16-key or 4-key rubber keypad 1^ protrudes through apertures in the
front-panel assembly. To seal the radio, the keypad is fitted inside a groove.
PTT Keypad The PTT keypad located at the side of the front-panel assembly B has one
large key for activating the PTT, and two function keys (blue and black).
The PTT keypad consists of:
■ the plastic PTT frame C
■ the silicone PTT keypad D
■ one bigger blue PTT pressel E
■ two smaller red function key pressels F
■ the metal PTT lock spring G.
The PTT lock spring, which fits over a T-shaped protrusion of the PTT
frame, secures the PTT keypad to the front-panel assembly. The pressels
operate tact switches on the main board.
Chassis The magnesium chassis 3) serves as carrier for the main-shield assembly 2),
the main board
2# and the rear panel 3$.
At the top of the chassis, two positioning pins are provided to fit the main
board to the chassis.
The main board is screwed to a screw boss of the chassis with one screw
2@.
Thermal paste is applied between the screw boss and the main board.
The chassis is screwed to the front-panel assembly with two screws
3!.
Main Seal The rubber main seal 2& fitted around the perimeter of the chassis 3) seals
the chassis against the front-panel assembly
B. The main seal is pre-shaped
to follow the shape of the chassis.
Top Seal The top seal 2& seals the area at the top of the chassis 3) around the shafts of
the power/volume potentiometer, the 16-way/3-way selector switch, and
the antenna SMA connector against the front-panel assembly
B.