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SGH-D720 Flow Chart of Troubleshooting and Circuit Diagrams
2-2-4. GSM Transmitter
F703 pin 13
about 2~5dBm?
YES
C709,RFS700,R702
check & change
PAM700
pin 3,6,17 : 3.4~4.2V?
PAM700
pin 1 : 'LOW'
PAM700
p i n 1 8:'HIGH'
PAM700
pin 20 : 340~380mV ?
PAM700
pin 5 : > 0 dBm?
U700
pin23 : 7~11dBm?
NO
pin4,5,6,7
U500
change
NO
pin9, 32 : 2.8V?
change or resolder
This Document can not be used without Samsung's authorization
NO
F703
pin 11 : 2.8V
YES
NO
PAM700 pin11
3~6dBm?
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
U700
1.7V
YES
YES
U700
YES
U700
SAMSUNG Proprietary-Contents may change without notice
U500
NO
check &
change
YES
F703, L703
check & change
BATTERY, BATTERY CONNECTOR
check & change
U500
check & change
U500
check & change
U500, R705
check & change
PAM700
c h a n g e&resolder
C701, F701
change or resolder
U700
NO
pin8 13MHz
Vp-p :800mV
R402, C408, C704
change or resolder
2-32
CONTINUS TX ON
MS TX level 19
CH : 62
RBW : 100KHz
VBW : 100KHz
SPAN : 10MHz
REF LEV. : 10dBm
ATT. : 20dB
OSC400
change or resolder
YES
OSC400
pin 4 : 2.8V ?
NO
U500
change or resolder
NO
OSC400
pin 3 : 13MHz
Vp-p : 800mV
YES
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