
VHF (136-174 MHz)
Troubleshooting Flow Chart
24
6. Troubleshooting Flow Chart
6.1
Control Circuit
Check the control
circuit
The product powers on
normally?[1]
Check U304, U306,
U303 and control circuit.
LED works normally?
3V3D is normal?
Replace LED
Check U2013,
U309
Reset
Check U305
Yes
No
Yes
No
Yes
Yes
No
No
Yes
No
No
19.2MHz crystal
oscillator is normal?[3]
The control circuit
is normal.
The RF circuit is
normal?[2]
Yes
No
Completed
Yes
1V3D is normal?
Check the power-on
circuit and U2014
1V8D is normal?
Description of Normal Situations:
Содержание PD502
Страница 1: ...PORTABLE...
Страница 5: ...VHF 136 174 MHz...
Страница 13: ...VHF 136 174 MHz Exploded View and Packaging Guide 7 3 2 Packaging Guide...
Страница 18: ...VHF 136 174 MHz Circuit Description 12...
Страница 43: ...PCB 3 9 PCB VHF 136 174 MHz...
Страница 44: ...PCB 3 VHF 136 174 MHz...
Страница 71: ...UHF1 400 470 MHz...
Страница 79: ...UHF1 400 470MHz Exploded View and Packaging Guide 7 3 2 Packaging Guide...
Страница 84: ...UHF1 400 470MHz Circuit Description 12...
Страница 108: ...UHF1 400 470MHz PCB 36 9 PCB...
Страница 109: ...UHF1 400 470MHz PCB 37...
Страница 136: ...1616300000260 2014 03 17 L07157 4...