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4. TROUBLE SHOOTING
For testing, Max power of UMTS50NHz is needed.
LGE Internal Use Only
Copyright © 2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes
Run a FTM program
set RF mode to
1900B set uplink
fre. to 4135 Click TX
On and WCDMA set
PA range R0 and R1
on set Tx AGC to 430
Check a
current over
500mA?
Check TP1
over 25dBm?
Check TP2
over 23dBm?
Check TP3
over 22dBm?
Tx is OK
Check ohter
parts
Check a
Coupler U106
and a solding
of L160
Check a
Duplexer and
a solding of
C1075
Check
ANT.SW
Module U100
Check Tx SAW
Filter and a solding
of C1105
Check TP4
over -5dBm?
Check PAM block
Refer to 3.5.4
NO
NO
NO
NO
NO
YES
YES
YES
YES
Summary of Contents for TU550
Page 1: ...Date May 2007 Issue 1 0 Service Manual Model TU550 Service Manual TU550 Internal Use Only ...
Page 185: ...Note ...
Page 186: ...Note ...