Gm380/Gm1280 Models - Motorola 6864115B62-C Detailed Service Manual

1-2 overview
3.0 GM380/GM1280 Models (GCN6121_)
The Controlhead contains the on/off/volume knob, the microphone connector, several buttons to
operate the radio, several indicator Light Emitting Diodes (LED) to inform the user about the radio
status, and a Liquid Crystal Display (LCD) with 21 pre - defined symbols and a 32*96 dot matrix for
graphical or alpha - numerical information e.g. channel number, select code, call address name. To
control the LED's and the LCD, and to communicate with the host radio the control head uses the
Motorola 68HC11K4 microprocessor.