TM9100 Service Manual Description 37
© Tait Electronics Limited August 2005
2.3.2 Power Connector
The power connector is the interface for the primary 13.8V power source
and the external speaker. The primary power source can be the vehicle
battery or a mains-fed DC power supply. There are different power
connectors for the 50W/40W and 25W radios.
Important The speaker load configuration is balanced; the speaker
output lines must not be connected to ground. Connecting
a speaker output line to ground will cause audio power
amplifier shutdown
Table 2.2 Power connector (radio) – pins and signals
Pinout Pin Signal name Description Signal type
1 AGND Earth return for radio body power
source.
Ground
2 SPK– External speaker output. Balanced load
configuration.
Analog
3 SPK+ External speaker output. Balanced load
configuration.
Analog
4 13V8_BATT DC power input for radio body and
control head.
Power
rear view
50W/40W radio
1 2 3 4
rear view
25W radio
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