UHF1 (400
‐
470 MHz)
Circuit Description
13
5. Circuit Description
5.1
Front Panel
Front panel includes components such as Power On/Off key and fan. The function diagram is shown
above.
Power Supply
The front panel is powered by the main board via Q5017, which is used as power supply for LED
indicator and USB devices. The fan is powered by the main board via Q2017, Q1 and U2016.
Keys
There is only one Power On/Off key on the front panel.
MMC Interface
Please refer to
for definition of the MMC interface.
Audio Output
The front panel provides one audio output: SPK±. SPK± is output by audio PA U3002 as audio signal for
the speaker of the palm microphone.
Summary of Contents for MD652
Page 1: ...DIGITAL MOBILE RADIO...
Page 5: ...UHF1 400 470 MHz...
Page 15: ...Exploded View and Packaging Guide UHF1 400 470 MHz 8 3 2 Packaging Guide...
Page 53: ...43 9 PCB View Front Panel PCB View Top Layer X...
Page 54: ...44 Front Panel PCB View Bottom Layer...
Page 55: ...45 Main Board PCB View Top Layer...
Page 56: ...46 Main Board PCB View Bottom Layer...
Page 106: ...VHF1 136 174 MHz...
Page 116: ...Exploded View and Packaging Guide VHF1 136 174 MHz 8 3 2 Packaging Guide...
Page 154: ...43 9 PCB View Front Panel PCB View Top Layer...
Page 155: ...44 Front Panel PCB View Bottom Layer...
Page 156: ...45 Main Board PCB View Top Layer...
