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Flow Chart of Troubleshooting
3-19
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3-2-3. EGSM TX
PAM300
pin
12
: about 2~3
dBm?
C302,RFS300
check&change
PAM300
pin6 : 2.8 V?
UCP101
check & change
PAM300
pin7 : 3.7 V?
NO
NO
YES
YES
NO
BATTERY
check & change
PAM300
pin 8 : 1.6V ?
YES
NO
PAM300 pin11
about : -5dBm
?
YES
PAM300
pin 4 : 2.9V?
YES
YES
PAM300
change or resolder
NO
UCP101
check
R303
Check
NO
U300
pin17 : 2.8V ?
UCP101
pinA13
,C115
change or resolder
YES
U300
pin19,20 :
26MHz ?
Vp-p : 380mV?
U300
pin2,3,22,23
:100mV?
YES
UCP101
change or resolder
NO
NO
U300
change or resolder
YES
NO
OSC300
change or resolder
CONTINOUS TX ON CONDITION
TX POWER DAC: 600 CODE APPLIED
CH : 62
RBW : 100KHz
VBW : 100KHz
SPAN : 10MHz
REF LEV. : 10dBm
ATT. : 20dB
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