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Flow Chart of Troubleshooting
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10-
28
10-2.RF
10-2-1. GSM850/GSM900 RX
Continuous RX ON
RF Input : 62 CH
AMP : -50dBm
NORMAL CONDITION
Catch the channel ?
YES
NO
CPL400 Check
Pin #1 (C414)
≥
-65dBm ?
CLP400 Check
Pin #10,#11(L405)
≥
-65dBm ?
U402 Check
Pin#6,#7
≥
-65dBm ?
Check cable from antenna to ANT400
Check Antenna to cable contact
Check soldered status of L407, L401, C412, ANT400
C414, L402, RFS400
Resolder or Change
CLP400 Resolder or Change
U402 Check
Pin#1,#8,#16,#22,#31,#48
=Clean 2.8V?
U402 Check
Pin#28,29,30,54=100mV?
C417,C431,C449,C447,C430
Check or resolder
Check U402
NO
NO
YES
YES
YES
NO
YES
U402 Check Pin #34(R401) :
26MHz ? Vpp : 1.2V?
R401 = 26MHz ?
Vpp : 1.2V?
R400 = 2.8V ?
U402
Change or resolder
NO
NO
NO
C404,R401
resolder
TCX401
Change or resolder
YES
YES
YES
NO
Check soldered status of
L405, C428, C429
YES
NO
(2)
(2)
(2)
(4)
(5)
(4)
(6)
(4)
(7)
(4)
(8)
(9)
(10)
(7)
(4)
(1)
(3)