START
The soldering of SIM connector
is OK?
Yes
The all paths connected
to J501 are OK?
Yes
The SIM Card is OK?
Yes
The ABB(IOTA) is broken.
Change the board.
Insert the SIM Card
No
No
C502,C504,C501,R502
No
SIM card is broken.
Change the SIM Card.
-71-
Resolder the
J501.
Resolder the