JVC 330, 370 SC, 340 SC service manual System Controller Board

	Chapter 2—Functional Description
+SERDATA	Serial data transfer. Unidirectional, differential, synchronous serial data
	communication line. Used for transferring data from SCB to other
	circuit boards. Uses SERCLK and IIC for control of receiver.
-SERDATA	Serial data transfer.
	System Controller Board
Output	Description
/IICINT	IIC interrupt line. Signal line for slave boards to inform the SCB (master)
	that there is data to be transferred. Master then polls slaves to
	determine the source of the interrupt.
I/o	Description
IICDATA	IIC data line. Bi-directional serial line for synchronous data transfer
	between SCB and other circuit boards. See detailed description for list
	of signals transferred and data direction.
	Raster Timing Generator
Inputs	Description
/PCST	Clock signal to start T/B pincushion, T/B Keystone, and horizontal
	linearity correction.
	Video Processor Board
Outputs	Description
HPARAB	Parabolic signal at horizontal frequency for dynamic focus.
VPARAB	Parabolic signal at vertical frequency for dynamic focus.
/SWEEPOK	Low indicates that all six sweeps are occurring at normal frequencies.
	Horizontal Deflection Board
Inputs	Description
HSENSRED	+15V indicates red horizontal flyback occurring at normal frequencies.
HSENSBLU	Similar to HSENSRED.
HSENSGRN	Similar to HSENSRED.
HFDBCK	Voltage representing amount of horizontal scan drive. Used for modifying
	amount of side pincushion and keystone when changing horizontal
	frequency.
WIDTH	Positive DC voltage representing commanded width of the raster. Used for
	generation of horizontal linearity ramp and T/B pincushion correction
	waveform.
VERTDR	Pulse signal at vertical frequency from the vertical oscillator on the HDB.
HLINR	Voltage representing commanded horizontal linearity correction.
TBKEYCOR	Voltage representing commanded top and bottom keystone correction.

Model 330, 340SC and 370SC Service Manual 2-39