Hitachi 51SWX20B Training page 64

DP-2X COMPONENT SYNC CIRCUIT EXPLANATION
(See DP-2X Series Chassis Main/Component Sync Separation Signal Path for details)
This diagram shows the route for sync utilized when the set has selected Component inputs.
IX02 Main Y Pr/Pb Selector:
The Component inputs are Component 1 at pin 59 and Component 2 at pin 5. The Y component for NTSC is in-
put at pin 53.
Main Y Output from IX02:
The Y component from the selected source is output at pin 44. Then through QX22 to the Main Video Chroma
Y Pr/Pb Switch IZ02 pin 30 and pin 6. After internal separation, the H Sync is output at pin 17 and the V. Sync is
output at pin 15.
H. Sync from IZ02 pin 17:
This is routed through the transistor QZ14 then to the connector PST1 pin 1. From here it is split. One route is
into the PFC1 pin 8 connector on the Flex Converter U303 called M H In (Main Horizontal In). The Flex Con-
verter uses this signal for a timing signal as it performs it's conversions.
The other route from the PST1 connector pin 1 is to pin 13 of the Sync selector IC I402. If the control line at pin
11 is high, this H. Sync is routed out pin 14 to pin 16 of the Rainforest IC I401. This sync is used if the set is re-
ceiving a true 1080i signal and the Flex Converter is bypassed.
V. Sync from IZ02 pin 15:
This is routed through the transistor QZ18 then to the connector PST1 pin 2. From here into the PFC1 connector
pin 7 on the Flex Converter U303 called M V In (Main Vertical In). The Flex Converter uses this signal for a
timing signal as it performs it's conversions.
PinP (Sub) Y Output from IX01:
The Y component from the selected source is output at pin 50. Then through QX19 to the Sub Video Chroma Y
Pr/Pb Switch IZ01 pin 30 and pin 6. After internal separation, the H Sync is output at pin 17 and the V. Sync is
output at pin 15.
H. Sync from IZ01 pin 17:
This is routed through the transistor QZ13 then to the connector PST2 pin 28. From here it is routed into the
PFC1 pin 15 connector on the Flex Converter U303 called S H In (Sub Horizontal In). The Flex Converter uses
this signal for a timing signal as it performs it's conversions.
V. Sync from IZ01 pin 15:
This is routed through the transistor QZ15 then to the connector PST2 pin 29. From here into the PFC1 connec-
tor pin 14 on the Flex Converter U303 called S V In (Sub Vertical In). The Flex Converter uses this signal for a
timing signal as it performs it's conversions.
I402 Sync Selector to the Rainforest IC I401:
One route for the H. Sync for the Main Picture is from the PST1 connector pin 1 is to pin 13 of the Sync selector
IC I402. If the control line at pin 11 is high, this H. Sync is routed out pin 14 to pin 16 of the Rainforest IC I401.
This sync is used if the set is receiving a true 1080i signal and the Flex Converter is bypassed.
The other route is for Horizontal Sync from the Flex Converter U303 pin 7 of PFC2. This Horizontal Sync signal
is called HD Out (Horizontal Digital Output, meaning that the signal has gone through the Digital manipulation
within the Flex Converter). This signal is routed to pin 12 of I402. If the control line at pin 11 is Low, this H.
Sync is routed out pin 14 to pin 16 of the Rainforest IC I401. This sync is used if the set is using a signal that has
been processed by the Flex Converter.
Vertical Sync from the Flex Converter U303 to the Rainforest IC I401:
The other route is for Vertical Sync from the Flex Converter U303 pin 6 of PFC2. This Vertical Sync signal is
called VD Out (Vertical Digital Output, meaning that the signal has gone through the Digital manipulation within
the Flex Converter). This signal is routed to pin 15 of the Rainforest IC I401. This sync is used no matter what
source, because all vertical timing is the same.
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