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Only for training and service purposes
LGE Internal Use Only
4. TROUBLE SHOOTING
LGE Internal Use Only
Check SW501. ANT, RF
with RF Cable connected.
Open
Yes
Changing SW501
Check SW501.ANT,RF
with RF Cable disconnected.
Short
Yes
Changing SW501
No
No
Check R513, R514, C512
Check whether Ant SW
Set as TX mode
i
Refer to Graph 4.3.2
i
Refer to Table 4.3.2
Yes
Check PA_EN, ANT_SW1 &
VBAT
Check RF Level of
U502.27(for GSM850 & EGSM),
U502.29(for DCS&PCS)
Pin15 : ~29.5dBm
Pin10 : ~26.5dBm
No
Yes
No
Changing board
Go to 4.3.3 Checking PAM control
signal
END
For the test,
TX Stand alone Mode is needed. Refer to chapter
10 (PL=7 for EGSM&GSM850, PL=2 for DCS&PCS)
CHECKING FLOW
Table 4.3.1