JVC 330 Service Manual page 50

Chapter 2—Functional Descriptions
Table 2-8 VDB Serial Bus Information
Bus I/O
IIC Front/Rear convergence
O
IIC Serial data load
I
Serial VH
I
Serial VCENTBLU
I
Serial I VCENTGRN
Serial I VCENTRED
Serial I TRAPCORR
Serial I LRPNCORR
Serial I TBPNCORR
Serial I HLINCORR
General I/O
This section provides a comprehensive description of the inputs to and outputs from the
VDB. The I/O description are arranged by the source/destination of the signal and so the
assemblies communicated with are used as the primary heading of each group of signals
and then are further subdivided into inputs and outputs. In each case, the signal's direction
is noted, with input referring to an input to the RTG, and output to an output from the
VDB. (e.g. under 'Raster Timing Generator', 'Input'; /PCST refers to the signal /PCST that
is an input to the VDB from the Raster Timing Generator). When test points are provided
for the I/O they are noted.
Table 2-9 Vertical Deflection Board I/O Signals
Input Description
IICCLK IIC clock line. Unidirectional clock line for control of synchronous data
RXCORR A 0-1 V signal from the bit-mapped memory on the SCB. 0.5V represents
RYCORR Similar to RXCORR.
GXCORR Similar to RXCORR.
GYCORR Similar to RXCORR.
BXCORR Similar to RXCORR.
BYCORR Similar to RXCORR.
+SERCLK Serial data transfer clock (+). Unidirectional, differential clock line from
-SERCLK Serial data transfer clock (-).
2-38
Information
indication
System Controller Board
transfer over IIC data bus.
no correction. This is a real time signal representing the X correction on
red.
SCB to other circuit boards. Used for synchronous control of serial
communication over SERDATA data lines.
Description
TTL level that indicates whether the X-
convergence is in front screen mode (high)
or rear screen (pulled low).
Command to the serial data receiver that the
incoming data is to be read.
Commanded vertical height of picture.
Commanded vertical position of blue raster.
Commanded vertical position of green raster.
Commanded vertical position of red raster.
Commanded L/R keystone correction.
Commanded L/R pincushion correction.
Commanded T/B pincushion correction.
Commanded overall horizontal linearity
correction.
Model 330. 340SC, and 370SC Service Manual