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SAMSUNG Proprietary-Contents may change without notice
SGH-D720 Flow Chart of Troubleshooting and Circuit Diagrams
2-
31
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2-2-3. PCS Receiver
CONTINUOS RX ON
RF INPUT : 661CH
Cell power : -50dBm
NORMAL CONDITION
catch the channel?
F703 CHECK
pin13
≥
-65dBm?
F703 CHECK
pin1,2
≥
-65dBm?
U700 CHECK
pin16,17
≥
-65dBm?
CHECK
R702, C709, L708 contact
NO
RFS700
resolder or change
NO
F703
resolder or change
NO
C710, C712,L705
resolder or change
NO
YES
YES
YES
R402, C408,C704
resolder or change
OSC400
change
U500 PIN A13 C513,L707
resolder or change
U700
resolder or change
NO
YES
U700 CHECK
pin9,32 : 2.8V
U700 CHECK
C704:13MHz
YES
OSC400 CHECK
pin 4 : 2.8V
pin 3 : 13MHz
V p-p : 800mV
NO
NO
NO
U700 CHECK
pin 1,2,3,28:
Vp-p 100mV
YES
NO
END
PCS Receiver is ok?
PCS RX path component
resolder or change
NO
YES