![background image](http://html.mh-extra.com/html/samsung/sgh-d720/sgh-d720_service-manual_1190477035.webp)
SAMSUNG Proprietary-Contents may change without notice
SGH-D720 Flow Chart of Troubleshooting and Circuit Diagrams
2-
32
This Document can not be used without Samsung's authorization
2-2-4. GSM Transmitter
F703 pin 13
about 2~5dBm?
F703
pin 11 : 2.8V
PAM700 pin11
3~6dBm?
U500
check &
change
F703, L703
check & change
C709,RFS700,R702
check & change
PAM700
pin 3,6,17 : 3.4~4.2V?
U500
check & change
PAM700
pin 1 : 'LOW'
PAM700
pin18:'HIGH'
PAM700
pin 20 : 340~380mV ?
PAM700
pin 5 : > 0 dBm?
U500
check & change
U700
pin23 : 7~11dBm?
U700
pin8 13MHz
Vp-p :800mV
U700
change or resolder
U700
pin4,5,6,7
1.7V
U500
change
C701, F701
change or resolder
OSC400
pin 3 : 13MHz
Vp-p : 800mV
OSC400
pin 4 : 2.8V ?
U500
change or resolder
OSC400
change or resolder
R402, C408, C704
change or resolder
NO
NO
NO
NO
NO
NO
YES
YES
NO
NO
YES
NO
YES
YES
YES
YES
YES
YES
YES
NO
NO
YES
NO
YES
YES
CONTINUS TX ON
MS TX level 19
CH : 62
RBW : 100KHz
VBW : 100KHz
SPAN : 10MHz
REF LEV. : 10dBm
ATT. : 20dB
BATTERY, BATTERY CONNECTOR
check & change
U500, R705
check & change
NO
PAM700
change&resolder
U700
pin9, 32 : 2.8V?
NO
YES