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Chapter 2—Functional Descriptions
2-70 Model 330. 340SC, and 370SC Service Manual
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