Hitachi 46W500 Training page 46

DP-3X COMPONENT SYNC CIRCUIT DIAGRAM EXPLANATION
(See Main/Component Sync Separation Signal Path for details)
IY04 Main/Chroma Y Pr/Pb Switch:
Any Component's Y signal arrives at pin 6 for the Main Picture. The Y component for NTSC is input at pin 4.
IY03 Sub/Chroma Y Pr/Pb Switch:
Any Component's Y signal arrives at pin 6 for the Sub Picture. The Y component for NTSC is input at pin 4.
Main Y Output from IY04:
The Main signal, either component or composite, is sync separated inside IY04 and output. The following de-
scribes it's associated output path.
(ALL CHASSIS)
H sync pin 17 to QY31 to the PST2 connector pin 35, to pin 8 of the PFC1 on the Flex Con-
verter.
(ALL CHASSIS BUT DP-37)
V sync pin 15 to QY32 to the PST2 connector pin 34, to pin 7 of the PFC1 on the Flex Con-
verter. (All chassis but DP-37)
(DP-37 CHASSIS ONLY)
This chassis has a Photo Card reader, the V Sync is output from pin 15 but is routed to pin 13
of IV07. The V Sync from the Photo Card Reader (Media Bridge) is input from the PBT con-
nector pin 10 and arrives at IV07 pin 13. Which ever signal source is selected, the V Sync
(MVD Out) is sent out pin 14 to the base of QY32 to the PST2 connector as described above.
Sub Y Output from IY03:
The Sub signal, either component or composite, is sync separated inside IY03 and output. The following de-
scribes it's associated output path.
•
H sync pin 17 to QY25 to the PST2 connector pin 31, to pin 15 of the PFC1 on the Flex
Converter.
•
V sync pin 15 to QY26 to the PST2 connector pin 32, to pin 14 of the PFC1 on the Flex
Converter.
SYNC FROM THE FLEX CONVERTER U401 TO THE RAINFOREST IC I501
•
H sync pin 35 to pin 12 of the Sync Selector I502, H sync for a true 1080i signal is input to
pin 13 of the Sync Selector I502 and output from pin 14 to the Rainforest IC pin 50. Note:
1080i bypasses the Flex converter. If 1080i is detected, the Rainforest IC I501 outputs a
high from the DAC 1 pin 34 to pin 11 of I502 sync selector to select Y sync prior to the
Flex Converter.
•
V sync pin 34 to pin 52, of the Rainforest IC I501. Since Sync is the same for 1080i
(60Hz) there is no need to route through a sync selector like the H. Sync.
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