Samsung STH-N271 Service Manual page 15

1
U101_61, 60, 58, 57
TX I/Q Quarature signal
AC Lev Vp_p=0.4V
DC bias Lev=1.5V
Y
U304_59(RF OUT)
Fc=Local_freq + 175.05
Y
U304_59(RF OUT)
measure Level
Send command PA_CNT
(Test mode:132)
Level is adjustable?
Y
U304_59(RF OUT)
Fc=Local_freq + 175.05
Y
3
SAMSUNG Proprietary-Contents may change without notice
Y
Replace U101
Need to check
OSC303,
V_IF_VCO=3.0V
2-11
STH-N271
2
U101_63 MOD
(sinusoidal wave)
N
MAX Vp-p=1.4V
Freq=1004Hz
OSC303_1
(FM modulation out)
N
Freq=175.05MHz
Audio Freq=1004Hz
Y
Need to check
V_RF2=3.0V or
N
Replace U304
Need to check
U304_66 or
N
Replace U304
Replace F310
N
Trouble Shooting
Y