Hitachi 51F510, Manual

Page: 47 / 152

DP-4X VIDEO SIGNAL SELECTION PATH EXPLANATION
PAGE 03-01
VIDEO SIGNAL SELECTION PATH EXPLANATION.
(See Video Select Selection Path Circuit Diagram for Details)
The Microprocessor I004 communicates with the Video Selector IC I402 via I
2
C communication. It outputs
SDA2 via pin 31 and SCL2 via pin 28 . These communications lines arrive at I402 on pins 45 and 46 respectively.
This allows the Microprocessor to select the appropriate Video input in accordance to the Customer’s selection.
Video Inputs to I402:
•
U301 Main Tuner Video :
The Video is output from the Main Tuner pin 18 . Then out the PTU2 connector pin 14 . Then arrives at
the Video Selector IC pin 15 .
•
U302 Sub Tuner Video :
The Sub Tuner Video is output from pin 3 . Then out the PTU2 connector pin 3 . Then arrives at the
Video Selector IC pin 3 .
•
HDMI 1 Y Pr/Pb :
The HDMI 1 component signals arrives at the Video Selector IC pin
39
(Y), pin
43
(Pr) and pin
41
(Pb).
HDMI 2 Y Pr/Pb :
The HDMI 2 component signals arrives at the Video Selector IC pin 33 (Y), pin 37 (Pr) and pin 35 (Pb).
•
Video Input 1 Video :
The Y Pr/Pb Component Video arrives at the Video Selector IC pin 27 (Y), pin 31 (Pr) and pin 29 (Pb).
•
Video Input 2 Video :
*The Y Pr/Pb Component Video arrives at the Video Selector IC pin
21
(Y), pin
25
(Pr) and pin
23
(Pb).
*Composite Inputs are accepted via the Y jack on Video 2. It arrives at pin 9 .
•
Video Input 3 Video :
The Video arrives at the Video Selector IC pin 77 .
The S-Video Y component arrives at the Video Selector IC pin 79 .
The S-Video C component arrives at the Video Selector IC pin 1 .
•
Video Input 4 Video :
The Video arrives at the Video Selector IC pin
71
.
The S-Video Y component arrives at the Video Selector IC pin 73 .
The S-Video C component arrives at the Video Selector IC pin 75 .
•
Video Input 5 Video :
The Video leaves the PFS2 connector pin 2 and arrives at the Video Selector IC pin 65 .
The S-Video Y component leaves the PFS2 connector pin 7 and arrives at the Video Selector IC pin 67 .
The S-Video C component leaves the PFS2 connector pin 9 and arrives at the Video Selector IC pin 69 .
•
Digital Tuner Video
: Used for Monitor Output Only.
The Video leaves the Digital Module from pin 31 (Y) and 33 (C) and arrives at the Video Selector IC
pin 11 (Y) and pin 13 (C).
At this point, the following inputs may be selected for viewing on the Main Screen: Main Tuner, Sub Tuner,
Component Inputs 1 or 2, HDMI inputs 1 or 2, Composite Video inputs Video 2, 3, 4 or 5 and/or S-In 3, 4 or 5.
Note: Digital Module Inputs are only selected for Monitor Outputs while watching an ATSC channel.
Watching the Digital Module output on the Main Picture is selected by
I502 shown on the component path.
Main Picture Outputs from I402:
•
Selected Main Composite (NTSC) Out from Pin 56 :
Composite Video is routed to the buffer Q407 and then to the Composite Video Signal Path 1H Circuit.
( See the Composite Video Signal Path 1H NTSC Circuit Diagram )
•
Selected Main S-Video (NTSC) Y Out from Pin 56 and S Out from pin 55 :
S-Video Y (Separate Video Y) is routed to the buffer Q407 and then to the Composite Video Signal
Path 1H Circuit. ( See the Composite Video Signal Path 1H NTSC Circuit Diagram )
S-Video C (Separate Video C) is routed to the buffer Q408 and then to the Composite Video Signal Path
1H Circuit. ( See the Composite Video Signal Path 1H NTSC Circuit Diagram )
(Continued on page 04-02)