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2-2.RF
2-2-1. GSM Receiver
NORMAL CONDITION
catch the channel?
YES
F703 CHECK
pin13 ≥ -65dBm?
YES
F703 CHECK
pin1,2 ≥ -65dBm?
YES
U700 CHECK
pin20,21 ≥ -65dBm?
YES
U700 CHECK
pin9,32 : 2.8V
YES
U700 CHECK
C704:13MHz
YES
U700 CHECK
pin 1,2,3,28:
Vp-p 100mV
YES
GSM Receiver is ok?
END
This Document can not be used without Samsung's authorization
SGH-D720 Flow Chart of Troubleshooting and Circuit Diagrams
NO
CHECK
R702,C709,L708 contact
NO
RFS700
resolder or change
NO
F703
resolder or change
NO
C715, C722,L701
resolder or change
NO
U500 PIN A13 C513,L707
resolder or change
NO
R402, C408,C704
resolder or change
NO
U700
resolder or change
NO
GSM RX path component
resolder or change
SAMSUNG Proprietary-Contents may change without notice
OSC400 CHECK
NO
pin 4 : 2.8V
pin 3 : 13MHz
V p-p : 800mV
NO
OSC400
change
2-29
CONTINUOS RX ON
RF INPUT : 62CH
Cell power : -50dBm
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