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9-2-3. GSM Tx
Check U101
pin 15 : about
2~3 dbm?
Yes
Check and
1
change
CON100,
L105,C103
PAM100 pin 15
: 3.7V ?
PAM100 pin 14 :
1.2V ?
PAM100 pin 5
:about -5dbm?
PAM100 pin 3
: 3V ?
PAM100
change or resolder
No
Check U101
pin 6 : 2.8V ?
Yes
No
PAM100 pin 5 :
about 4~5dbm?
Yes
U101
check & change
No
Yes
No
Yes
No
Yes
No
Yes
2
Check and
No
change
UCP300,
UCP200
3
4
Battery,
UCP200
check & change
5
UCP200
check
6
UCP200
check
U101 pin 12,13,
28,29 : 2.9V ?
Yes
U101
change or resolder
9-17
Flow Chart of Troubleshooting
CONTINUS TX ON CONDITION
TX POWER DAC : 554 CODE
APPLIED
CH : 62ch
RBW : 100KHz
VBW : 100KHz
SPAN : 10MHz
REF LEV : 10dBm
ATT : 20dB
No
UCP200
change or resolder
7
8
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