Pcs Rx - Samsung SGH-S730i Service Manual

Flow Chart of Troubleshooting

3-2-3. PCS RX

Continuous RX ON
RF Input : 698 CH
Cell Power : -50dBm
NORMAL CONDITION
Catch the channel ?
YES
U102 Check
Pin #13 (C101) ≥ -65dBm ?
YES
U102 Check
Pin #1,#2 ≥ -65dBm ?
YES
U100 Check
Pin#8(L105),#9(L106)
≥ -65dBm ?
YES
U100 Check
Pin#1,#18,#26,#11
=Clean VBAT?
YES
U100 Check
Pin#13(C125) ≥ 3.8V?
YES
U105 Check Pin #2(R120) :
Check U100
NO
NO
NO
NO
NO
NO
13MHz ? Vpp : 2.9V?
YES
U100
Change or resolder
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Check cable from antenna to ANT100
Check Antenna to cable contact
Check soldered status of L100, C100, ANT100
C100, L100, RFS100
Resolder or Change
U102 Resolder or Change
Check soldered status of
L105, L106
C102,C103,C104,C105,C106
,C107,C108
Check or resolder
NO
U104 = 26MHz ?
Vpp : 50mV?
YES
U100
Change or resolder
2-30
NO
U104
Change or resolder