Sony KP 48S70, Training Manual

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1
Introduction
Overview
The purpose of this manual is to discuss the circuitry in the 1999-2000
Sony projection television chassis. These chassis are the RA-3 and RA-
4A. Both of these chassis share circuitry with the RA-2 and/or RA-4 chas-
sis. There are previous training manuals that cover circuits in these mod-
els. The TVP-07 manual covers the RA-2 chassis and the TVP-08 manual
covered the RA-4 chassis. We will include excerpts from these training
manuals in the Appendix at the rear of this manual. Please take note that
some of the component designations may be different between the older
and newer chassis.
RA-3 Features
The following models use the RA-3 chassis:
KP-43T70 KP-53N74 KP-48V80
KP-46C70 KP-53S70 KP-53V80
KP-48S70 KP-61S70 KP-61V80
KP-48S72
Important Note: The book will make reference to two distinct types of
RA-3 chassis, S and V. Since the T, C and N models are similar to the S
models, we will be referring to all of these models when the term S mod-
els is used unless otherwise noted. This is because the C and N models
have marketing differences and are only sold by certain dealers. The T
model is distinctive because it uses the tabletop design instead of the
standard slim line design.
All RA-3 chassis models contain the following features:
Flash Focus System Steady Sound Auto Volume
Advanced Picture Stabilizer Shading Compensation
2 Tuner PIP Velocity Modulation Scanning
Free Layout PIP Dynamic Focus Circuitry
Flash Focus – One button system that aligns the horizontal and vertical
centering of the red, green and blue tubes. This system differs from pre-
vious Sony one touch systems in that it does not align the skew of the
colors only the centering.
Advanced Picture Stabilizer - Maintains constant picture quality by re-
sponding more quickly during scene changes, especially sudden dark-to-
bright transitions, thereby reducing zooming effect, minimizing picture dis-
tortion and correcting blooming (poor focus).
Free Layout PIP – Allows the PIP picture to be moved anywhere on the
screen instead of to just the designated corners.
Beside screen size, the table below shows the differences between the N,
S, T and V models:
C,N and S T V
Comb Filter
3 Line 3 Line 3D
High
Contrast
Screen
No Yes Yes
Audio Power
Output
15Wx2 15Wx2 20Wx2
Surround
Sound
Matrix Matrix Tru-Surround
PIP Regular Regular Twin View
Center
Speaker
Input No No Yes
Component
Video Inputs 1 1 2
3 Line Digital Comb Filter – To improve color performance, uses digital
memory to evaluate three adjacent horizontal scanning lines at a time.
3D Digital Comb Filter – Uses digital memory to compare each horizon-
tal line with the line above and below it and also with the corresponding
lines in adjacent frames.