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Flow Chart of Troubleshooting
10-
19
10-2. RF
10-2-1. GSM Receiver
CONTINUOS RX ON
RF INPUT : 62CH
Cell power : -50dBm
NORMAL CONDITION
catch the channel?
CHECK
C100 contact
NO
1
YES
F100 CHECK
pin6
≥
-65dBm?
RFS100
resolder or change
2
NO
YES
F100 CHECK
pin12,13
≥
-65dBm?
F100
resolder or change
NO
3
UCD100 CHECK
pin6,7
≥
-65dBm?
YES
C108 L102, L103
resolder or change
NO
4
YES
BTC506 PIN 1, C520
resolder or change
NO
UCD100 CHECK
pin1,13,22,32:3.1V
5
6
YES
TCX101 CHECK
pin 4 : 2.9V
pin 3 : 13MHz
V p-p : 800mV
R115
resolder or change
UCD100 CHECK
R114
:13MHz
NO
NO
NO
YES
TCX101
change
UCD100
resolder or change
UCD100 CHECK
pin 35,36,37,38:
Vp-p 100mV
NO
END
GSM Receiver is ok?
GSM RX path component
resolder or change
NO
YES
8