Egsm Tx - Samsung SGH-S720i Service Manual

Flow Chart of Troubleshooting and Circuit Diagrams

3-2-4. EGSM Tx

Check pin #12 of
PAM100 = 2~5dBm
YES
Check and Change
UCP300,C101
CONTINOUS TX ON
CONDITION
TX POWER DAC: 500 CODE
APPLIED
CH : 30
RBW : 100KHz
VBW : 100KHz
SPAN : 10MHz
REF LEV. : 10dBm
ATT. : 20dB
Check and Change
UCP300
YES
Change UCP300
NO
Check pin #8 of P
AM100 = 2.9V
YES
Check pin #7 of
PAM100 = 3.7V
YES
Check pin #6 of
PAM100 = "High"
YES
Check pin #17,4 of
PAM100 = "Low"
YES
Check pin #8 of P
AM100 = 1.2V
YES
Check pin #11 of
PAM100 = -5dBm
YES
Check and Change
PAM100
Check pin #1,2,3,4 NO
of RFT100 = 1.7V
YES
Check and Change
RFT100
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NO
Check and Change
UCP300
NO
Check the battery
block
NO
Check and Change
UCP300
NO
NO
Check and Change
UCP300
NO
Check pin #15 of R
FT100 = 7~11dBm
NO
YES
Check pin #34,35
of RFT100=26Mhz
YES
Check and Change
RFT100
3-28
NO
Check and Change
OSC100