Flow Chart of Troubleshooting
3-18
3-2-3. GSM Tx
Check U400pin
15 : about 2~3
dbm?
Check U400
pin 6 : 2.8V ?
Check and
change
RFS400
,
L300,L301
Yes
Check and
change
UCP201
,
UCP101
No
CONTINUS TX ON CONDITION
TX POWER DAC : 554 CODE
APPLIED
CH : 62ch
RBW : 100KHz
VBW : 100KHz
SPAN : 10MHz
REF LEV : 10dBm
ATT : 20dB
PAM400 pin 11:
about 4~5dbm?
Yes
No
Yes
PAM400 pin 7 :
3.7V ?
U400
check & change
No
Battery,
UCP101
check & change
Yes
PAM400 pin 8 :
1.2V ?
No
UCP101
check
Yes
PAM400 pin 6 :
3V ?
No
UCP101
check
U400 pin
12,13,28,29 : 2.9V
?
PAM400
change or resolder
UCP101
change or resolder
No
Yes
U400
change or resolder
Yes
PAM400 pin 12:
about -5dbm?
No
Yes
No
1
2
3
4
5
6
7
8
3
7
2
4
5
6
8
1
2