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Flow Chart of Troubleshooting
10-
37
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10-2-5. DCS/PCS TX
(1)
CLP400 Pin#13
About 2~3 dBm?
NO
(14)
(3)
NO
U402
Check & Change
CLP400 Pin#3
(C423) = High?
YES
Check cable from antenna to ANT400
Check Antenna to cable contact
Check soldered status of L407, L401, C412, ANT400
(2)
(4)
YES
Level of CLP400
Pin#7 (C437) is
4~5dBm ?
NO
(1)
YES
Continuous TX ON condition
TX Power Code : 500 code Applied
CH : 62
RBW : 100KHz
VBW : 100KHz
SPAN : 10MHz
REF. Level : 10dBm
ATT. : 20dB
CLP400
Check & Change
(5)
NO
Check the
Battery Block
C446
= 3.7V?
(7)
(6)
YES
Check
U402 TXP(R426) OK ?
NO
NO
U402
Check & Change
Level of PAM400
Pin #1 is
1.2V?
YES
YES
(6)
(6)
NO
Change PAM400
PAM400 pin#1
About -5 dBm?
YES
(9)
(8)
C417,C431,C449,C447,C430
Check or resolder
U402 Check Pin#1,
#8,#16,#22,#31,#48
=Clean 2.9V?
NO
U402 Check
Pin#28,29,30,54=100mV?
(8)
NO
(11)
(10)
(10)
YES
C404,R401
resolder
U402 Check Pin #34(R401) :
26MHz ? Vpp : 1.2V?
NO
NO
R401 = 26MHz ?
Vpp : 1.2V?
(12)
U402
Change or resolder
(8)
YES
YES
NO
R400 = 2.8V ?
YES
(13)
TCX401
Change or resolder
Check U402