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4. TROUBLE SHOOTING
4.16 SIM Detect Troubleshooting
Start
Work well?
TP1 is 2.85V?
TP2 (Clock) is run?
Change the Main board
End
Check J1
Yes
No
YES
NO
Re-insert the SIM card
Change SIM card
Work well? End
Yes
No
USIM Initial sequence of GW620 is :
SIM_CLK,SIM_RST,SIM_IO triggered Æ VRUIM_3.0V go to 2.85V Æ SIM IF work
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