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SAMSUNG Proprietary-Contents may change without notice
1-10
STH-N375 Trouble Shooting
1
3
Replace U101
Y
Y
Need to check
V_RF2=3.0V or
Replace U301
2
Y
U301_59(RF OUT)
Fc=Loca 175.05
U101_61, 60, 58, 57
TX I/Q Quarature signal
AC Lev Vp_p=0.4V
DC bias Lev=1.5V
U101_63 MOD
(sinusoidal wave)
MAX Vp-p=1.4V
Freq=1004Hz
OSC303_1
(FM modulation out)
Freq=175.05MHz
Audio Freq=1004Hz
Need to check
OSC303,
V_IF_VCO=3.0V
N
N
N
N
Y
Need to check
U301_66 or
Replace U304
U301_59(RF OUT)
measure Level
Send command PA_CNT
Level is adjustable?
N
Y
Replace F306
U301_59(RF OUT)
Fc=Loca 175.05
N
Y