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