Tait TP9100 Service Manual

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22 Description TP9100 Service Manual© Tait Electronics Limited May 2005Speaker The speaker 1#, which is also used as the microphone, sits inside a recess ofthe front-panel assembly, where an adhesive speaker cloth 1! is fixed to thespeaker grille. An adhesive speaker ring 1@ and a speaker clamp 1$ hold thespeaker in position. For correct orientation, alignment features are providedat the top of the speaker and the front-panel assembly B. The top end of thespeaker clamp is held in place by a recess inside the front-panel assembly, andthe bottom end is fastened to a screw boss with a screw 1%.Two speaker contacts connect to two spring-loaded speaker pins on themain board 2#. The speaker is earthed by a flexible tab on the main-shieldassembly 2) which presses on the speaker chassis.Keypad The 16-key or 4-key rubber keypad 1^ protrudes through apertures in thefront-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 onelarge 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 PTTframe, secures the PTT keypad to the front-panel assembly. The presselsoperate 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 mainboard 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) sealsthe chassis against the front-panel assembly B. The main seal is pre-shapedto 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 ofthe power/volume potentiometer, the 16-way/3-way selector switch, andthe antenna SMA connector against the front-panel assembly B.