Hitachi 46W500 Training page 28

DP-3X MICROPROCESSOR DATA COMMUNICATIONS CIRCUIT EXPLANATION
IY04 Main Video Chroma Y Pr/Pb Switch IC
This IC is responsible for selecting the Main picture source. It will be either Composite NTSC Y and C or com-
ponent Y Pr/Pb or Y Cr/Cb dependant upon the customer's selection.
•
This IC processes the NTSC Luminance (Y) and Chroma (C) from the 3D Y/C circuit for the main picture if
this is the selection. It receives the Y (pin 4) and C (pin 19) and prepares it for the Flex Converter by output-
ting it as Y (pin 24) Cr (pin 22) / Cb (pin 23) NTSC Only 480i component to the Flex Converter .
•
This IC selects the Y (pin 30) Pr or Cr (pin 28) / Pb or Cb (pin 29) if this is the selection by the customer and
outputs it as Y (pin 24) Pr or Cr (pin 22) / Pb or Cb (pin 23) to the Flex Converter. If the output is 1080i, it's
routed directly to the Rainforest IC I501.
Communication from the Microprocessor via pins (31 SDA2 and 28 SCL2) to connector PST2 pins (15 and 14)
then to IY04 pins (13 and 14) respectively.
Note: Y Pr/Pb indicates either 31.5Khz or 33.75Khz and Y Cr/Cb indicates 15.734KHz
IY03 Sub Video Chroma Y Pr/Pb Switch IC
This IC is responsible for selecting the PinP (Sub) picture source. It will be either Composite NTSC Y and C or
component Y Pr/Pb or Y Cr/Cb dependant upon the customer's selection.
•
This IC processes the NTSC Luminance (Y) and Chroma (C) from the 3D Y/C circuit for the main picture if
this is the selection. It receives the Y (pin 4) and C (pin 19) and prepares it for the Flex Converter by output-
ting it as Y (pin 24) Cr (pin 22) / Cb (pin 23) NTSC Only 480i component to the Flex Converter .
•
This IC selects the Y (pin 30) Pr or Cr (pin 28) / Pb or Cb (pin 29) if this is the selection by the customer and
outputs it as Y (pin 24) Pr or Cr (pin 22) / Pb or Cb (pin 23) to the Flex Converter. If the output is 1080i, it's
routed directly to the Rainforest IC I501.
Communication from the Microprocessor via pins (31 SDA2 and 28 SCL2) to connector PST2 pins (15 and 14)
then to IY03 pins (13 and 14) respectively.
Note: Y Pr/Pb indicates either 31.5Khz or 33.75Khz and Y Cr/Cb indicates 15.734KHz
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