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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.