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Chapter 2—Functional Description
Model 330, 340SC and 370SC Service Manual 2-37
Correction Amplifiers
There are six (6) correction amplifiers. Each one receives a real-time convergence
correction signal:
RXCORR.
RYCORR.
GXCORR.
GYCORR.
BXCORR.
BYCORR, from the SCB convergence section.
The X-correction amplifiers, R, G, and B, also receive the horizontal linearity signal. The
horizontal linearity signal is then combined with the appropriate color's X-correction
signal to produce a composite horizontal correction signal. The Y-correction amplifiers,
R, G, and B, receive the top and bottom pincushion and keystone correction signal. The
pin and key correction signal is then combined with the appropriate color's Y-correction
signal to produce a composite vertical correction signal. All six (6) correction signals are
then amplified by the correction amplifiers and are sent to their respective yoke coils.
Serial Communication
The VDB uses two (2) separate, interrelated serial data communication systems to
communicate with the SCB; the IIC bus, and a differential, synchronous data bus. The
information transferred over the serial busses is indicated below (I = input to VDB, 0 =
output from VDB). Also noted is whether the information is transferred over the IIC or
the serial bus. A change in output data generates an interrupt pulse.