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This is a good quality scan of the service manual which includes an assembly diagram, block diagram, schematic, and parts list. Exactly what is needed to repair my KR-V55R receiver.
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IC description
Pin 65 - GY Analog Green/Luma Input This input pin takes the AC-coupled analog compinent signal Green or Luma. The amplitude is 1.0V maximum at 75 Ohms and a couplign capacitor of 220nF. Internally, the DC-offset of the input signal is adjusted via the programmable internal clamping circuit. Connect to ground if not used.
Pin 66 - GNDGY Analog Ground This is the ground pin for the A/D converter of the Green or Luma signal and must be connected to ground. Note : All ground pins of the chip(i.e. 18,52,58,60,62,64, 66, and 68) must be connected together low rresistive. The layout of the PCB must take into consideration the need for a low-noise ground.
Pin 67 - RV Analog Red/V Chroma Input This input pin takes the AC-coupled analog component signal Red or V Chroma. The amplitude is 1.0V maximum at 75ohms and a coupling capacitor of 220nF. Internally, the DC-offset of the input signal is adjusted via the programmable internal clamping circuit. Connect to ground if not used.
Pin 68 - GNDRY Analog Ground This is the ground pin for the A/D converter of the Red or V Chroma signal and must be connected to ground. Note : All ground pins of the chip (i.e. 18,52,58,62,64,66, and 68) must be connected together low resistive. The layout of the PCB must take into consideration the need for a low-noise ground.
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