Tait TM8235, Service Manual

Page: 30 / 578

30 Description TM8100/TM8200 Service Manual
© Tait Electronics Limited June 2006
Concealed
Microphone
(Optional)
A concealed microphone
1)
consisting of the microphone capsule and a
rubber seal can be fitted in a round recess inside the front panel assembly
H
.
The microphone leads are soldered to two pads on the top side of the
control-head board
E
. Before the microphone is fitted a small hole is drilled
in the recess to provide an acoustic path to the microphone. The hole is
covered by the rubber seal to ensure that the control head remains sealed to
IP54 standards. For more information refer to
“TMAA02-06 Support Kit
for Concealed & Dynamic Microphones” on page 493 .
Space-Frame
The plastic space-frame
G
clips into the six recesses inside the front panel
assembly
H
. The front side of the space-frame holds the keypad (with the
four light pipes), the LCD, and the speaker in place and at the same time
allows access to their electrical contacts. The rear side of the space-frame has
three holes for the screws
D
of the control-head board
E
.
Control-Head Board
The control-head board
E
is a printed circuit board in SMT design with
components on the top and bottom sides. There are different boards for the
control heads with 1-, 2- and 3-digit display.s
The control-head board is clipped and then fitted to the space-frame
G
with
three 3x8 PT screws
D
.
The side facing the radio body has the connectors for the connection of the
control-head loom
B
, the speaker, an optional control-head options board
C
, and pads for the leads of the optional concealed microphone
1)
.
The side facing the front panel has the volume-control potentiometer, the
microphone connector, the indicator and backlight LEDs, the contacts for
the keypads, and the LCD.
Control-Head Loom
The control-head loom
B
with the female-female adapter connects the
connector on the control-head board
E
to the control-head connector of
the radio body. For more information refer to “Control-Head Connectors”
on page 42 .