JVC 370 SC IIC Vidok, IIC Sweepok, IIC Beamdet, Redbias, Grnbias, Blubias, Rcont, Gcont, Bcont

						Chapter 2—Functional Description
IIC		O		VIDOK		Tells SCB that no VABs are reporting problems.
IIC		O		SWEEPOK		Tells SCB that all sweeps are operating.
IIC		O		BEAMDET		Tells SCB that beam current limiting is occurring.
BUS	I/O		Information		Description
Serial	I		REDBIAS		Commanded amplitude of red LCLV bias.
Serial	I		GRNBIAS		Commanded amplitude of green LCLV bias.
Serial	I		BLUBIAS		Commanded amplitude of blue LCLV bias.
Serial	I		RCONT		Commanded red contrast.
Serial	I		GCONT		Commanded green contrast.
Serial	I		BCONT		Commanded blue contrast.
Serial	I		BRIGHT		Commanded brightness level.

General I/O

This section provides a comprehensive description of the inputs to and outputs from the VPB. The I/O description are arranged by the source/destination of the signal and so the assemblies communicated with are used as the primary heading of each group of signals and then are further subdivided into inputs and outputs. In each case, the signal's direction is noted, with input referring to an input to the RTG, and output to an output from the VPB. (e.g.: under Raster Timing Generator 'Input'; VSYNC refers to the signal VSYNC that is an input to the VPB from the Raster Timing Generator). When test points are provided for the I/O they are noted.

Table 2-11. Video Processor Board I/O Signals

	System Controller Board
Input	Description
IICCLK	IIC clock line. Unidirectional clock line for control of
	synchronous data transfer over IIC data bus.
BONSCRN	Along with RONSCRN, GONSCRN, VONSCRN,
	VIDBLANK, and DCRSTR (the later two on from the
	RTG board) determines whether there is full brightness,
	black, gray-scale, or external video presented in blue at a
	given point on the screen.
RONSCRN	Similar to BONSCRN.
GONSCRN	Similar to BONSCRN.
VONSCRN	Determines if internal test patterns will be shown.
VIDTEST	Internal gray-scale video input information. Real time data 0V
	to 1V.
RSENS	Sensitivity (Z-axis gain) correction information for red. Real
	time data at 0V to 1V.
GSENS	Similar to RSENS.
BSENS	Similar to RSENS.

Model 330, 340SC and 370SC Service Manual 2-49