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Flow Chart of Troubleshooting
3-18
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3-2-3. GSM Tx
Check U400pin
12 : about 2~3
dbm?
Check PAM400
pin 6 : 2.8V ?
Check and
change
RFS400,C302
L301,L302
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 ?
U300
check & change
No
Battery,
UCP101
check & change
Yes
PAM400 pin 8 :
1.2V ?
No
UCP101
check
Yes
PAM400 pin 6 :
3V ?
No
UCP101
check
U300 pin 2,3,22,23
: 100mV ?
PAM400
change or resolder
UCP101
change or resolder
No
Yes
U300
change or resolder
Yes
PAM400 pin 12:
about -5dbm?
No
Yes
No
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2
3
4
5
6
7
8