JVC 340 SC - Manual (Page 51)

Chapter 2—Functional Description
Model 330, 340SC and 370SC Service Manual 2-39
+SERDATA Serial data transfer. Unidirectional, differential, synchronous serial data
communication line. Used for transferring data from SCB to other
circuit boards. Uses SERCLK and IIC for control of receiver.
-SERDATA Serial data transfer.
System Controller Board
Output Description
/IICINT IIC interrupt line. Signal line for slave boards to inform the SCB (master)
that there is data to be transferred. Master then polls slaves to
determine the source of the interrupt.
I/o Description
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
/PCST Clock signal to start T/B pincushion, T/B Keystone, and horizontal
linearity correction.
Video Processor Board
Outputs Description
HPARAB Parabolic signal at horizontal frequency for dynamic focus.
VPARAB Parabolic signal at vertical frequency for dynamic focus.
/SWEEPOK Low indicates that all six sweeps are occurring at normal frequencies.
Horizontal Deflection Board
Inputs Description
HSENSRED +15V indicates red horizontal flyback occurring at normal frequencies.
HSENSBLU Similar to HSENSRED.
HSENSGRN Similar to HSENSRED.
HFDBCK Voltage representing amount of horizontal scan drive. Used for modifying
amount of side pincushion and keystone when changing horizontal
frequency.
WIDTH Positive DC voltage representing commanded width of the raster. Used for
generation of horizontal linearity ramp and T/B pincushion correction
waveform.
VERTDR Pulse signal at vertical frequency from the vertical oscillator on the HDB.
HLINR Voltage representing commanded horizontal linearity correction.
TBKEYCOR Voltage representing commanded top and bottom keystone correction.