This is a current (2016) amplifed speaker with an On/Off switch and volume control for both the speaker and also for handset/headsets.
Theboth handset mike audio outputs are tied toghther and are routed directly to the Radio Interface connector, i.e. it does not have any presence on the PCB.
The PTT lines from both handsets are tied toghther and go to both the Radio Interface connector and the PCB ofr Tx/Rx switching.
There are two audio inputs from the Radio Interface connector, maybe for the Left and Right handset audio connectors.
Panel connector: MS3114E10-6S
Cable connector: MS3116x10-6P
Handset-A Audio gnd
Why two audio inputs on Pins B (standard) and Pin F (aux?). Tell me
Panel connector: KS3114E8-33P
Cable connector: MS3116x8-33S
Pin A goes to PCB-17 through L8 then L4 then PCB-8 and then to Power-B. So either A or B can be used as the DC power return.
Not sure why this is done? If you know tell me.
Panel connector: U-283
Pins E & F not used
U-229 Audio Pinout
1 = 1A
White/Green L. Handset-C
Gray R. Handset-B
Gray L. Handset-B
4 = 4A
6 = 6A = 7
9 = 10
17 - L8 - L4 - 8
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