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SAMSUNG Proprietary-Contents may change without notice
Flow Chart of Troubleshooting
10-
35
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10-2-4. GSM850/GSM900 TX
Continuous TX ON condition
TX Power Code : 500 code Applied
CH : 62
RBW : 100KHz
VBW : 100KHz
SPAN : 10MHz
REF. Level : 10dBm
ATT. : 20dB
C446
= 3.7V?
Change PAM400
NO
YES
CLP400 Pin#13
About 2~3 dBm?
CLP400 Pin#8
(C424) = High?
U402
Check & Change
NO
YES
CLP400
Check & Change
YES
Check the
Battery Block
Level of PAM400
Pin #7 is
1.2V?
Check
U402 TXP(R426) OK ?
U402
Check & Change
YES
YES
NO
NO
NO
NO
PAM400 pin#7
About -5 dBm?
YES
NO
YES
U402 Check Pin#1,
#8,#16,#22,#31,#48
=Clean 2.9V?
NO
C417,C431,C449,C447,C430
Check or resolder
Level of CLP400
Pin#7 (C455) is
4~5dBm ?
Check cable from antenna to ANT400
Check Antenna to cable contact
Check soldered status of L407, L401, C412, ANT400
(1)
(2)
(3)
(4)
(1)
(5)
(6)
(7)
(6)
(6)
(8)
(9)
(8)
NO
U402 Check
Pin#28,29,30,54=100mV?
(12)
(11)
(10)
YES
C404,R401
resolder
U402 Check Pin #34(R401) :
26MHz ? Vpp : 1.2V?
NO
NO
R401 = 26MHz ?
Vpp : 1.2V?
YES
YES
(13)
(8)
U402
Change or resolder
R400 = 2.8V ?
NO
YES
TCX401
Change or resolder
Check U402
(10)
(14)