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5. Trouble shooting
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5.10 SIM card trouble
Check Points
-Power control FET is working
-Socket soldering
-Proper SIM is used
Q301
D
G
S
SI1305-E3
4.7K
R320
1u
C309
27p
C308
J301
CLK
3
4
GND
I_O
6
2
RST
VCC
1
VPP
5
27p
C310
2V85_SIM
SIM_IO SIM_CLK
SIM_RST
_SIM_EN
Check
soldering all
pin of socket
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