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SGH-E600/E608 Flow Chart of Troubleshooting and Circuit Diagrams
2-
10
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2.RF
1. GSM Receiver
CONTINUOS RX ON
RF INPUT : 62CH
Cell power : -50dBm
NORMAL CONDITION
catch the channel?
F1000 CHECK
pin15 ≥ -65dBm?
F1000 CHECK
pin1,2 ≥ -65dBm?
U901 CHECK
pin20,21 ≥ -65dBm?
CHECK
R1007,L1000,C1000,contact
NO
CN1000
resolder or change
NO
F1000
resolder or change
NO
C1002,C1003,L1001
resolder or change
NO
YES
YES
YES
R800, C902
resolder
OSC800
change
U100 PIN 39, C112
resolder or change
U901
resolder or change
NO
YES
U901 CHECK
pin9,32 : 2.8V
U901 CHECK
pin8: 13MHz
YES
OSC800 CHECK
pin 4 : 2.8V
pin 3 : 13MHz
V p-p : 950mV
NO
NO
NO
U901 CHECK
pin 1,2,3,,27:
V p-p100mV
YES
NO
END
GSM Receiver is ok?
GSM RX path component
resolder or change
NO
YES