Dcs/Pcs Tx - Samsung SGH-S730i Service Manual

Flow Chart of Troubleshooting

3-2-5. DCS/PCS TX

U102 Pin#13
About 2~3 dBm?
YES
Check cable from antenna to ANT100
Check Antenna to cable contact
Check soldered status of L100, C100, ANT100
Continuous TX ON condition
TX Power Code : 500 code Applied
CH : 698
RBW : 100KHz
VBW : 100KHz
SPAN : 10MHz
REF. Level : 10dBm
ATT. : 20dB
NO
U102 Pin#9
(C117) = High?
Level of U102
Pin#8 (C113) is
4~5dBm ?
U102
Check & Change
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NO
UCP301
Check & Change
YES
NO
YES
Level of PAM100
Pin #14 is
4~5dBm ?
YES
Check soldered status of
R104
PAM100 Check Pin#4,
2-32
NO
NO
PAM100 pin#6
is 500mV ?
YES
NO
Check or resolder
#5 =Clean 2.9V?
NO
PAM100 Check
Pin#2 is -5dBm ?
Check PAM100
Change U100
C122,C123,C124
Change U100