JVC 370 SC, 330, 340 SC service manual Horizontal Deflection Board

Chapter 2—Functional Descriptions

		Horizontal Deflection Board
I/O	Description
IICDATA	Data line for transferring the following data (I = input, O = output).
	O	Flyback Switch Select
	O	Flyback Switch Pulse
	I	Front/Rear indication
	I	Floor/Ceiling Indication
	O	Serial Data Load

Input	Description
/IICINT	Interrupt that tells the SCB that the HDB has data to report.
	Horizontal Deflection Board
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:
	HPHASE to control the horizontal phase, HLINR to control the
	horizontal linearity, HCENTBLU, HCENTGRN, HCENTRED
	to control the horizontal centering of the blue, green and red
	rasters respectively, and WIDTH to control the horizontal width
	of all three rasters and for control of geometric correction.
-SERDATA	Serial data transfer
	System Power Supply
Inputs	Description
+5.0V	Power for digital components
+5V STB	Power to CPU and peripherals
+15V	Power for analog components
-15V	Power for analog components
/LAMPLIT	Indicates normal operating voltage being supplied to Arc Lamp
Output	Description
/LVPSNBL	Low Voltage Power Supply Enable
/FANENBL	Signal to enable 24V Standby Power
/ALENBL	Enables Arc Lamp Power
	Dot Matrix Status Display
Outputs	Description
LEDDO-6	Data
/LEDLT	Lamp test
/LEDWR	Write

2-70 Model 330. 340SC, and 370SC Service Manual