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Flow Chart of Troubleshooting and Circuit Diagrams
3-6
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USIM_2.85V
NC
10
1 VCC
2 VCC
5 VPP
SIM500
CLK
3
GND
4
I/O
6
NC
7
8 NC
9 NC
R509
C539
C543
C542
C541
C540
USIM_DATA
USIM_CLK
USIM_RESET