Hitachi 51F510, Руководство пользователя, Страница: 48 / 152

DP-4X VIDEO SIGNAL SELECTION PATH EXPLANATION
PAGE 03-02
(Continued from page 04-01)
Main Picture Outputs from I402: Continued
Main Selected Component Out Y Pr/Pb from Pin 56 (Y), pin 54 (Pr) and pin 55 (Pb):
•
The Main Y Pr/Pb signal is then routed to the Component Selector IC
I502
. Its inputs are pin
78
(Y), pin
2
(Pr) and pin 80 (Pb). The outputs from the Component Selector IC I502 are pin 20 (Y), pin 16 (Pr) and
pin 18 (Pb). ( For continuation see the Composite Video Signal Path 1H NTSC Circuit Diagram )
Sub Picture Outputs from I402:
•
Selected Sub Composite (NTSC) Out from Pin 60 :
Composite Video is routed to the buffer
Q403
and then to the Composite Video Signal Path 1H Circuit.
( See the Composite Video Signal Path 1H NTSC Circuit Diagram )
•
Selected Sub S-Video (NTSC) Y Out from Pin 60 and S Out from pin 59 :
S-Video Y (Separate Video Y) is routed to the buffer Q403 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 Q405 and then to the Composite Video Signal Path
1H Circuit. ( See the Composite Video Signal Path 1H NTSC Circuit Diagram )
•
Selected Sub Component Out Y Pr/Pb from Pin 60 (Y), pin 58 (Pr) and pin 59 (Pb):
The Sub Y Pr/Pb signal is then routed to the Component Selector IC I501 . Its inputs are pin 78 (Y), pin
2 (Pr) and pin 80 (Pb). The outputs from the Component Selector IC I502 are pin 20 (Y), pin 16 (Pr) and
pin 18 (Pb). ( For continuation see the Composite Video Signal Path 1H NTSC Circuit Diagram )
Monitor Outputs from I402:
•
Composite Monitor Output pin 52.
•
S-Out for Monitor Out (Only when an S-In Input is being used as the Main picture)
S-Y pin 51 .
S-C pin
50
.
S-In Detection Inputs to I402:
•
When an S-In plug is inserted into the S-In jack, a mechanical switch is engaged. This notifies the Selec-
tor IC
I402 that a plug is inserted and the S-Input is forced as the selection for that input. The switch clos-
ing provides a ground or low to the detection pin.
1. S-In for Video 3 detected by pin 2 of I402 .
2. S-In for
Video 4
detected by pin
76
of
I402
.
3. S-In for Video 5 is output the connector PFS2 pin 11 and detected by pin 70 of I402 .
*Note: Video 2 can accept either Component and/or Composite. How this is detected is by the insertion of the Pr
plug. There’s a mechanical switch which notifies the selector IC
I402 at pin 9 . That a plug is inserted or not. This
can be helpful in troubleshooting. The Technician can use a composite input on the Y jack, insert a dummy plug
into the Pr jack and the unit will assume there’s component inputs. At this time, the On Screen display will indi-
cate Y Pr/Pb and the picture should appear but in Black and White. This can be helpful if the Technician doesn’t
have a component source at the time of troubleshooting.