Functional description of PCBs
48
Manpack Transceiver 2110 series Repair Guide
Front Panel PCB
The Front Panel PCB performs the following functions:
•
interprets data from the Audio & Control PCB and displays it on the LCD
•
reads keypad entries and sends data to the Audio & Control PCB
•
provides an RS232 port for programming/control
•
amplifies the audio for the internal and external speakers
•
pre-amplifies microphone audio and external audio input
•
provides side-tone for the handset
•
provides contrast adjustment for the LCD
•
backlights the LCD
•
passes the key inputs directly to the Audio & Control PCB
The Front Panel PCB contains:
•
a UART to provide GPIO control (IC6)
•
an RS232 driver/receiver (IC11)
•
an octal D-type latch (IC4, IC5) for switching speaker, RS232 functions, speaker
on/off etc
•
audio amplifiers to drive the handset earphone (IC8), internal speaker (IC3) and an
external speaker (IC9)
•
amplifiers to provide pre-amplification of microphone (IC1) and external audio in
(IC19)
•
an amplifier to produce side-tone to the earphone (IC21)
•
an LCD (H2) and drivers (IC16, IC17, IC18)
•
a connection to the Front Panel Assembly
•
a connection to the GPS antenna, if fitted
•
a connection to the external GPS antenna connector, if fitted
•
a LED (H1) for backlighting
For details on the Front Panel PCB,
Codan part number
See...
08-06129-001
Table 12 on page 49
Содержание 2110 series
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