Samsung SGH-B300 Service Manual page 31

Flow Chart of Troubleshooting
10-2-3. EGSM Tx
Check
PAM100 pin 17
: about 2~3
dbm?
Yes
Check and change
RFS100,C108,C111,
L102,L103,L104
PAM100 pin 30
3.7V ?
PAM100 pin 3 :
1.2V ?
PAM100 pin 17:
about -5dbm?
PAM100 pin 4 :
2.8V ?
PAM100
change or resolder
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Check
No
PAM100
pin 4 : 2.8V ?
Yes
No
PAM100 pin 27:
about 4~5dbm?
Yes
U100
check & change
No
:
check & change
Yes
No
Yes
No
Yes
No
U300
Yes
SAMSUNG Proprietary-Contents may change without notice
Check and
No
change
UCP200,U300
Battery, U300
U300 check
check
U100 pin
2,3,22,23 :
100mV ?
Yes
U100
change or resolder
10-19
CONTINUS TX ON CONDITION
TX POWER DAC : 554 CODE
APPLIED
CH : 62ch
RBW : 100KHz
VBW : 100KHz
SPAN : 10MHz
REF LEV : 10dBm
ATT : 20dB
No
U300
change or resolder