Samsung SGH-C260 Service Manual page 33

Fl o w Chart of Troubl e shooti n g
3-2-3. GSM Tx
Check U304
pin #11 is
about 2~3dbm?
Yes
1
Check and change
RFS100, C101,
L111, L 100
CONTINUS TX ON CONDITION
TX POWER DAC : 554 CODE
APPLIED
CH : 62ch
RBW : 100KHz
VBW : 100KHz
SPAN : 10MHz
REF LEV : 10dBm
ATT : 20dB
No
Check U304
pin #4 is
about 2.8?
Yes
Check U304
pin #17 is
about 4~5dbm? :
2.8V ?
No
Check UCD101
pin #10 is
about 4~5dbm?
Yes
UCD101 pin #14
is 3.7V ?
Yes
UCD101 pin #17
is 2.9V ?
Yes
UCD101 pin #2
is 1.8V ?
Yes
UCD101 pin #20
is about 26mHz?
Yes
UCD101 pin #21
is about 26mHz?
Yes
6
Check UCD107
3-18
2
No
Check and resolder or change
3
Check and resolder or change
Yes
3
4
No
Check and resolder or change
5
No
Check and change
2
No
Check and resolder or change
6
No
7
No
2
No
Check and resolder or change
UCD101
U304
C119, R102
Battery, UCD107
UCD101
Check UCD107
Check OSC101
UCD101