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SGH-X450 Flow Chart of Troubleshooting
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7-9
U201 CHECK
pin#13 ≥ -65dBm ?
7. EGSM Reciever
CONTINUOUS RX ON
RF INPUT : 62CH
AMP : -50dBm
NORMAL CONDITION
catch the channel?
U100 CHECK
pin38 : 13MHz ?
Vp-p : 860mV?
U201 CHECK
pin#1, 2 ≥ -65dBm ?
U100 CHECK
pin#20,21 ≥ -65dBm ?
Check soldered status of
C205,C204,L211
CON1
resolder or change
U201
resolder or change
C220,C221,L204
resolder or change
OSC100 CHECK
pin#4 : clean 3V?
U100 CHECK
pin#9 : clean 3V?
C118,R103,C108
resolder
OSC100 change or
resolder
U300 pin#39
check or resolder
U100 pin#1,2,3,28
Vp-p : 100mV?
U100
resolder or change
CHECK
U500
NO
YES
NO
NO
NO
NO
NO
NO
NO
YES
YES
YES
YES
YES
YES
YES
YES
OSC100 CHECK
pin#3 : 13MHz ?
Vp-p : 950mV?