Gsm Receiver - Samsung SGH-E600 Service Manual

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