Hitachi 50VS69A, Руководство по обслуживанию

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IT02 Pin 41 MPEG-DATA 0
1
2
3
4 5 6
7
11 IT02 Pin 66 MPEG_PKT_SYNC
10 IT02 Pin 63 MPEG_DATA EN
TABLE OF CONTENTS
4.0 V
SUB PWB
QAM/VSB DEMODULATOR
click here to go to circuit diagram
using a Color Bar signal with H sync 31 khz and V. sync 60 hz and a X10 probe.
Numbers inside circle correspond to locations shown in the circuit diagram. Waveforms taken
Signal amplitude and DC level shown at and @ respectively.
∆
LC67
4.0 V 4.0 V
4.0 V
4.0 V
4.0 V
4.0 V
4.0 V
4.0 V
IT02 Pin 42 MPEG-DATA 1 IT02 Pin 47 MPEG-DATA 2
IT02 Pin 48 MPEG-DATA 3 IT02 Pin 50 MPEG-DATA 4 IT02 Pin 51 MPEG-CLK
8 9
5
IT02 Pin 54 MPEG-DATA 5 IT02 Pin 57 MPEG-DATA 6 IT02 Pin 59 MPEG-DATA 7/SER_DATA
WAVEFORMS AT EACH SECTION
7
5