Voxtel V310, Service Manual

Page: 38 / 66

5-15
Troubleshooting
NO
YES
Check :
· U201 soldering
· U201 pin 26, 32 DC 2.85V
Replace U201 if defective.
Check
U201 pin 22
Frequency = 1747.8 MHz
Power ≥ ≥ ≥ ≥ -10dBm
Check
Power Amp U101 output [C110]
Frequency = 1747.8 MHz
Power ≥
≥ ≥
≥ 10dBm
Check :
· U101 soldering
· U101 pin 42, 43 VBAT DC voltage ( > 3.3V)
· U101 pin 45 PA_LEVEL signal (> 0.7V)
Replace U101 if defective.
NO
YES
NO
YES
YES
YES
Check
ANT switch U100 pin 8
Frequency = 1747.8 MHz
Power
≥ ≥ ≥ ≥
10dBm
Check :
· U100 soldering
· U100 pin 6 low voltage
· U100 pin 1 high voltage
Replace U100 if defective.
Check :
• RF connector ANT101 soldering.
END