Sim Part Troubleshooting - Samsung SM-M307F Service Manual

8. Level 3 Repair
8-4-4. SIM Part
Insert SIM card
Is SIM socket ok?
Check the SIM Voltage.
= 1.8V or 3.0V
(C6019,C6022)?
Check the SIM RST / IO / CLK.
(SIM1 : ZD6024, ZD6022, ZD6023)
(SIM2 : ZD6027, ZD6025, ZD6026)
Is signal ok?
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Yes
No
Yes
No
Yes
No
Yes
No
END
No
Replace SIM socket
Change to the new SIM card.
If it doesn`t still work SIM card after
No
changing
the SIM card, Check the U5000 (Crack
etc)
No
Check the UCP400 (Crack etc)