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DP-4X VIDEO SIGNAL SELECTION PATH EXPLANATION
(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.
PAGE 03-02
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