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Flow Chart of Troubleshooting
10-20
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10-2-3. EGSM TXPAM100 pin12
:about2~3
dBm?
C199,RFS100
check&change
PAM100
pin6: 2.8 V?
U107
check & change
PAM100
pin7: 3.7 V?
NO NO
YES
YES
NO BATTERY
check & change
PAM100
pin8 :1.6V ?
YES
NO
PAM100 pin11
about: -5dBm
?
YES
PAM100
pin4 :2.9V?
YES
YES
PAM100
change or resolder
NO
U107
check
R118
Check
NO
U102
pin12,13,25,26,
28 : 2.8V ?
U107
pinA13,C172
change or resolder
YES
U102
pin30,31:
26MHz ?
Vp-p: 950mV?
U102
pin4,5,6,7:100m
V?
YES
U107
change or resolder
NO
NO
U102
change or resolder
YES
NO OSC100
change or resolder
CONTINOUSTX ON CONDITION
TX POWER DAC: 600 CODE APPLIED
CH: 62
RBW : 100KHz
VBW : 100KHz
SPAN: 10MHz
REFLEV. : 10dBm
ATT.: 20dB
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