SERVICE MANUAL
Document No
Date of Origin
Date of REV
51-L-DSR004
98-10-21
PAGE REV.
0
PAGE
37 /102
S-00-005(96.03.27)
REV.1
7-9-2-2.
Check the Operating
Voltage
of the QPSK Demodulator
IC as follows.
3.3VD
: Pin 2 of U104
3.3VA
: Pin 2 of U105
7-9-2-3.
Check whether
I2C Control
of the QPSK Demodulator
works properly
as follows
SDA
: TP108
SCL
: TP106
SCL
SDA
200us
Vp-p : 3.3V
figure 7-9-2-2.
SDA, SCL signal wave form
7-9-2-3.
Check the TP107, ADC Sampling
Clock as follows.
ADCLK
20ns
figure 7-9-2-3.
ADCLK signal wave form