LG KP170 - Page 48

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Only for training and service purposes
4. TROUBLE SHOOTING
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Check SW500.ANT, RF with RF
Cable connected.
Open
Yes
Changing SW
500
Check SW500.ANT,RF
with RF Cable disconnected
Short
Yes
Changing SW500
No
No
Check C500,C502,C503
Check whether Ant SW
Set as TX mode
Refer to Graph 4.3.2
Refer to Table 4.3.2
Yes
Check ANT SW & Vdd
Check RF Level of
U501 Pin 17(for GSM) & Pin 19(for DCS)
Pin17 : ~29.5dBm
Pin19 : ~26.5dBm
No
Yes
No
Changing boar
d
Go to 4.3.4 Checking PAM
control sign
al
END
For the test,
TX Stand alone Mode is needed. Refer to
chapter 10 (PL=7 for GSM, PL=2 for DCS
)
011GSM Tx
BSTx_EN
111DCS Tx
101DCS Rx
001GSM Rx
Input Control Bits
VlogicMode
CHECKING FLOW