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4. TROUBLE SHOOTING
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4.12 SIM Detect Troubleshooting
USIM Initial sequence of U250/KU250 is :
USIM_CLK,USIM_RST,USIM_DATA triggered → VREG_UIM_2.85V go to 2.8V → USIM IF work
Start
Work well?
VREG_UIM_2.85V is 2.85V?
USIM_P_CLK is run?
Change the Main board
End
Check J300
Yes
No
YES
NO
Re-insert the SIM card
Change SIM card
Work well?
End
Yes
No