92
Circuit Descriptions
TM8100/TM8200 Service Manual
© Tait Electronics Limited
June 2006
3.9
Control-Head Board with Graphical Display
Introduction
This section describes the control-head board for the control head with
graphical display.
For a block diagram of the digital circuitry, refer to
Most signals (except power on/off, speaker and microphone) to and from
the radio body are processed by a RISC processor, which is implemented on
an FPGA on the control-head board. For more information on the RISC
processor and the FPGA, refer to
“Software Architecture” on page 47
.
User Interface
The control-head board includes the circuitry for the following control
elements:
■
ON
/
OFF
key
■
volume potentiometer
■
main keypad (with four functions keys, two scroll keys and
two selection keys)
■
LCD module (with backlighting and optional heating element)
■
three status LEDs
■
two function key LEDs (for function keys
F1
and
F4
)
■
keypad backlighting LEDs
■
speaker.
Connectors
The control-head board includes the circuitry for the following connectors:
■
microphone connector (RJ45 socket)
■
control-head connector (18-way MicroMaTch socket)
■
LCD connector (for internal connection of LCD module)
■
speaker connector (2 leads)
■
soldering pads (2 leads) for an optional concealed microphone
■
control-head options connector (for optional circuit board).
Protection circuitry is provided for the microphone connector. For pinouts
of the control-head connector and the microphone connector, refer to
. For more information on the control-head
options connector, please contact Tait Electronics Limited.
ON
/
OFF
Key
When battery power (13.8V) is applied to the radio, a press of the
ON
/
OFF
key
will create an active low signal (
CH ON OFF
) back to the radio body to initiate
the power-on or power-off sequence. This key-press will also be detected
by the FPGA of the control head through Q611 as an active high signal.
For more information on the start-up process, refer to
Summary of Contents for TM8235
Page 1: ...TM8100 mobiles TM8200 mobiles Service Manual MMA 00005 04 Issue 4 June 2006...
Page 10: ...10 TM8100 TM8200 Service Manual Tait Electronics Limited June 2006...
Page 62: ...62 Description TM8100 TM8200 Service Manual Tait Electronics Limited June 2006...
Page 148: ...148 Disassembly and Reassembly TM8100 TM8200 Service Manual Tait Electronics Limited June 2006...
Page 162: ...162 Servicing Procedures TM8100 TM8200 Service Manual Tait Electronics Limited June 2006...
Page 178: ...178 Interface Fault Finding TM8100 TM8200 Service Manual Tait Electronics Limited June 2006...
Page 258: ...258 Receiver Fault Finding TM8100 TM8200 Service Manual Tait Electronics Limited June 2006...
Page 446: ...446 Spare Parts TM8100 TM8200 Service Manual Tait Electronics Limited June 2006...
