JVC 370 SC, 330, 340 SC service manual Video Processor Board, Description, Input, Output

		Chapter 2—Functional Description
Table 2-12System Controller Board I/O Signals
		Video Processor Board
I/O	Description
IICDATA	Data line for transferring the following information
	(I = input, O = output). The input data are associated with an
	interrupt pulse.
	I	VIDOK
	I	SWEEPOK
	I	BEAMDET
	O	BENABLE
	O	GENABLE
	O	RENABLE
	O	CH1SEL
	O	CH2SEL
	O	SLOAD
	O	VERTICAL FREQUENCY
Input	Description
/IICINT	Interrupt used to tell the SCB that the VPB has data to report.
		Video Processor Board
Output	Description
IICCLK	Clock signal for IIC data bus.
+SERCLK	Serial data transfer clock.
-SERCLK	Serial data transfer clock.
+SERDATA	Serial data transfer. Used to transfer the following command data:
	REDBIAS, GRNBIAS, and BLUBIAS to control the bias on
	the three (3) ILA® s respectively, RCONT, GCONT, and
	BCONT to control the contrast for the three CRTs, and
	BRIGHT to control the brightness for all three CRTs.
-SERDATA	Serial data transfer.
BONSCRN	Output from the overlay interface used to turn blue overlay on and
	off.
RONSCRN	Similar to BONSCRN.
GONSCRN	Similar to BONSCRN.
VONSCRN	Output from overlay interface used to turn external video on and
	off.
VIDTEST	Video signal output for gray-scale. Real time data at 0V to 1V.
RSENS	Sensitivity output from the DAC at 0V to 1V with 140 ohm Zout.
GSENS	Similar to RSENS.
BSENS	Similar to RSENS.
RTHRESH	Threshold output from the DAC at 0V to 1V with 140 ohm .
GTHRESH	Similar to RTHRESH.
BTHRESH	Similar to RTHRESH.

Model 330, 340SC and 370SC Service Manual 2-67