JVC 340 SC - Manual (Page 43)

Chapter 2—Functional Description
Model 330, 340SC and 370SC Service Manual 2-31
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
/VFBST Signal to control the vertical oscillator frequency and retrace timing
/HSYNCR Regenerated horizontal sync signal
Outputs Description
/HVFLBCK Pulse signal representing horizontal flyback used to determine phase of
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Vertical Deflection Board
Inputs Description
GEOCORR Periodic signal for L/R keystone and L/R pincushion correction
FLRCLING TTL level indicating whether or not raster is inverted
Outputs Description
VERTDR Pulse output from vertical oscillator.
HLINR DC voltage controlling horizontal edge linearity correction
HFDBK DC voltage proportional to the H power supply output voltage
WIDTH DC voltage indicating commanded width.
TBKEYCOR DC voltage representing commanded top and bottom keystone correction
HSENSRED DC voltage, high when flyback pulse for red yoke is present at normal
frequencies.
HSENSBLU Similar to HSENSRED.
HSENSGRN Similar to HSENSRED.
Main Horizontal Deflection Coils
Inputs Description
/INLCK Return from series daisy-chain for sensing yoke connectors installed.
Outputs Description
+INLCK Negative voltage supply from the horizontal power supply to the daisy-
chained yoke connector interlock.
+BHORYK Positive supply from the centering current source to the blue horizontal
main deflection coil.
-BHORYK Return from the blue horizontal main deflection coil to the horizontal
deflection power transistor.
+GHORYK Similar to +BHORYK.
-GHORYK Similar to -BHORYK.
+RHORYK Similar to +BHORYK.
-RHORYK Similar to -BHORYK.