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Mobilchips
SGH-X610 Flow Chart of Troubleshooting
2-
26
2-2-4. DCS1800 TX
U403 pin 12 :
about 2~3
dBm?
CON401, L402
check&change
U403
pin5,13:
0~0.2V
pin11:2.4~2.8
U101,A12,B11
check & change
U401 pin31 :
about 4~5dBm?
U403,C413,C415,L407
check & change
PIN 42,43 of
U401 > 3.3V?
NO
NO
YES
YES
YES
NO
NO
BATTERY
check & change
PIN 40 of
U401 : HIGH ?
YES
NO
U401 pin37
≥
3dBm ?
YES
U401
pin 41 : 3V?
YES
YES
U401
change or resolder
NO
U101
check
U101
check
NO
OSC301
pin 4
≥
2.8V
U101 pinA13, R301, C307
change or resolder
YES
U402
pin8 : 13MHz ?
Vp-p:950mV?
U402
pin4,5,6,7:100m
V?
YES
U101
change or resolder
NO
NO
OSC301
change or resolder
YES
NO
OSC301
change or resolder
CONTINUOUS TX ON CONDITION
CH : 698CH(DCS),660CH(PCS)
TX POWER CODE: 350 CODE Aplied
RBW : 100KHz
VBW : 100KHz
SPAN : 10MHz
REF LEV. : 10dBm
ATT. : 20dB