JVC 330, 370 SC, 340 SC service manual Sysclk, Vertical Deflection Board Description

Chapter 2—Functional Description

SYSCLK	4.05MHz clock signal
IICCLK	Clock signal for the IIC data bus.
+SERCLK	Serial data transfer clock.
-SERCLK	Serial data transfer clock.
+SERDATA	Serial data transfer.
-SERDATA	Serial data transfer.

Vertical Deflection Board

I/O	Description
IICDATA	Data line for transferring the following data (I = input, O =
	output), the input data are associated with an interrupt
	pulse.
	I	SLOAD

Input	Description
/IICINT	Interrupt used to tell the SCB that the VDB has data to
	report.
Output	Description
IICCLK	Clock signal for the IIC data bus.
+SERCLK	Serial data transfer clock.
-SERCLK	Serial data transfer clock.
+SERDATA	Serial data transfer. Used to transfer the following command
	data:
	VH+, VH- to control the vertical amplitude (height)
	VCENTRED, VCENTGRN, VCENTBLU to control
	vertical
	centering of the red, green and blue rasters respectively;
	TRAPCORR to control keystone correction;
	LRPNCORR for left and right pincushion correction;
	TBPNCORR for top and bottom pincushion correction;
	HLINCORR for horizontal linearity correction.
-SERDATA	Serial data transfer.
RXCORR	Horizontal correction output from DAC with 140 ohm Zout.
RYCORR	Vertical correction output from DAC with 140 ohm Zout.
GXCORR	Similar to RXCORR.
GYCORR	Similar to RYCORR.
BXCORR	Similar to RXCORR
BYCORR	Similar to RYCORR.

Model 330, 340SC and 370SC Service Manual 2-69