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SAMSUNG Proprietary-Contents may change without notice
1-8
STH-N375 Trouble Shooting
N
Replace U301
Case TDMA mode:
setup basestation for RX test
Amplitude:-50dBm
3
U301_9, 10, 11, 12
measure I/Q
Quarature wave
N
Need to check U301 &
Quad LC Tank circuit
(L303, C315, C316,
C317, R307)
PON_LD=H
Case AMPS mode:
setup basestation for RX test
Audio Freq gen : 1004Hz
FM deviation : 2.9kHz
4
Y
Y
Y
U301_16 DEMOD
(sinusoidal wave)
Vp-p=240mV
Freq=1004Hz
N
Need to check U301 &
R326, R320, C352, C127
U101_52 DEMOD
(sinusoidal wave)
MAX Vp-p=1.4V
Freq=1004Hz
N
Replace U203
Y
U101_40 BBCLK=
6.2208MHz or 4.096NHz or
5.12MHz
N
Replace U203
Y
U101_32RX_CLK=
BBCLK/2 or
BBCLK/8
N
Replace U203
Y
U101_31 RX_SYNC=
BBCLK/32 or
BBCLK/128
N
Replace U203
Y
U101_31 RX_DATA=
serial data
DONE