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SGH-D730 Flow Chart of Troubleshooting and Circuit Diagrams
2-
19
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2-2.RF
2-2-1. GSM Receiver
CONTINUOS RX ON
RF INPUT : 62CH
Cell power : -50dBm
NORMAL CONDITION
catch the channel?
F603 CHECK
pin13
≥
-65dBm?
F603 CHECK
pin1,2
≥
-65dBm?
U600 CHECK
pin20,21
≥
-
65dBm?
CHECK
R601, contact
NO
CN600, C607
resolder or change
NO
F603
resolder or change
NO
C609, C610,L602
resolder or change
NO
YES
YES
YES
R400, C408, C604
resolder or change
OSC400
change
U500 PIN A13, C513
resolder or change
U600
resolder or change
NO
YES
U600 CHECK
pin9,32 : 2.8V
U600 CHECK
C604:13MHz
YES
OSC400 CHECK
pin 4 : 2.8V
pin 3 : 13MHz
V p-p : 800mV
NO
NO
NO
U600 CHECK
pin 1,2,3,4,5,6,7:
Vp-p 100mV
YES
NO
END
GSM Receiver is ok?
GSM RX path component
resolder or change
NO
YES
1
2
3
4
5
6
8
7
