Ra-3 And Ra-2 Similarities; Ra-3 And Ra-4 Similarities; New Circuitry - Sony KP-43T70 Training Manual

Matrix Surround Sound – Adds ambience to stereo programs for home
theater like sound.
Tru-Surround Virtual Dolby Surround – Generates lifelike sound from
the rear speakers using only the stereo pair built into the cabinet. This
system uses Dolby Pro Logic to provide a very convincing effect.
Twin View – Sony's picture and picture feature, which allows two pictures
to be displayed side by side. This Twin View system is functionally the
same as the XBR system, but does not display the two pictures in 480P
resolution.

RA-3 and RA-2 Similarities

The following are similarities between the RA-2 and RA-3 chassis. The
Appendix at the rear of the book contains excerpts from TVP-07 that de-
scribe the operations of these circuits. Keep in mind that component
designation and location will be different.
Basic board layout is the same except the Z boards have been re-
moved. The yokes have connectors that connect to the CG board.
Switching Power Supply
Vertical Deflection Circuit is the same, but is now located on the G
board instead of the A board.
The Horizontal, High Voltage and Pin Amplifier
System Control is similar, but there are some additional lines to deal
with new features such as component video inputs and digital regis-
tration. Reset, key scan and EEPROM reading and writing remain
the same.

RA-3 and RA-4 Similarities

The following are similarities between the RA-2 and RA-4 chassis. The
Appendix at the rear of the book contains excerpts from TVP-08 that de-
scribe the operations of these circuits. Keep in mind that component
designation and location will be different.
The digital registration and auto focus circuits located on the BD board
in the RA-4 chassis are used. They are mounted to the A board in the
RA-3 chassis.
The RA-3 chassis uses the same digital registration system used in
the RA-4 chassis. Digital registration allows the servicer to adjust the
set using course and fine modes. The fine mode uses a point system
that allows 81 different points to be adjusted for each color. The sys-
tem differs slightly from the RA-4 chassis because of the addition of a
control for green vertical skew.
The Flash Focus system has been added to the RA-3 chassis. This
system is similar to the Auto Focus system found in the RA-4 chassis
except the RA-3 system only performs auto centering while the RA-4
system performed auto centering and skew. The difference lies in the
use of the sensors. The RA-4 system used eight sensors and the RA-
3 system only uses four. This is why the auto skew adjustment is not
possible.
Convergence Amplifier
Self-Diagnostics similar to the RA-4 chassis is used. The difference is
that the failure signal from each circuit is input to the System Control
IC since the RA-3 chassis does not have an OSD Processor.
RA3 New Circuitry
The following are new circuits that will be covered in this book:
Power supply Protection
Video Signal Path – The different video paths for S and V models will
be discussed. The switching, comb filter and PIP circuits are different
between S and V models. The OSD and video processing (YCJ) are
the same between various models.
CRT drive will be described using the CG board. A discrete amplifier
is used instead of the video amplifier IC used in previous models.
The Standby Supply is similar to the one in the AA2W direct view
chassis. There is an excerpt from CTV-26 describing the circuit op-
eration of this circuit.
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