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4. GSM Transmitter
F100 pin 13
about
2~3dBm?
YES
CN101, L105,
C138
check & change
pin 42,43 :
pin 40 :
pi n 41 :
pin 45 :
1.2V V?
U102 pin 48
: -5dBm?
change & resolder
CHECK
U301 pin A13, C311
change or resolder
U101
NO
pin4,5,6,7
1.7V
U102
U301
check &
change
change
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SGH-E610 Flow Chart of Troubleshooting and Circuit Diagrams
NO
F100
pin 11 : 2.8V
YES
U102 pin6
3~4dBm?
NO
YES
U102
check & change
BATTERY,
U102
NO
U301
check &
3.7V
change
NO
YES
U102
'LOW'
YES
U102
NO
U301
check & change
'HIGH'
YES
NO
U102
YES
NO
YES
U102
U101
NO
pin9,32
2.8V
YES
U101
NO
pin8 13MHz
Vp-p
:950mV
YES
YES
U101 change or
resolder
U301
NO
check &
change
OSC101
NO
pin 3 : 13MHz
Vp-p : 950mV
OSC101
pin 4 : 2.8V ?
change or
resolder
2-19
CONTINUS TX ON
CONDITION
MS TX level 19
CH : 62
RBW : 100KHz
VBW : 100KHz
SPAN : 10MHz
REF LEV. : 10dBm
ATT. : 20dB
OSC101
NO
change or
resolder
YES
NO
U301 pin A13 ,R101
change or resolder
YES
U101
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