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A
B
1
2
3
4
Waveform Measurements
3
1.
indicates waveform measurement.
4.
All video and color waveforms are
(Measurement can be taken at the
taken with a wideband scope and
best accessible location in common
a probe with low capacitance (10
to the indicated point.)
to 1). Shape and peak altitudes
2.
Taken
with
an
NTSC
signal
may vary depending on the type
generator connected to the antenna
of Oscilloscope used and its
terminal. (NTSC color bar pattern of
settings.
8 bars of EIA colors, 100 IRE white
5.
Ground symbol
shown on
and 7.5 IRE black.)
waveform number indicates (Hot)
3.
Customer Controls (Picture/Audio
ground lead connection of the
Menu) are set to Normalize. Volume
Oscilloscope.
is set to "MIN".
CAUTION:
Incorrect
ground
connection of the test equipment will
result in erroneous readings.
5
IMPORTANT SAFETY NOTICE
THIS SCHEMATIC DIAGRAM INCORPORATES SPECIAL FEATURES
THAT ARE IMPORTANT FOR PROTECTION FROM X-RADIATION, FIRE
AND ELECTRICAL SHOCK HAZARDS.
WHEN SERVICING IT IS
ESSENTIAL THAT ONLY MANUFACTURERS SPECIFIED PARTS BE
USED FOR THE CRITICAL COMPONENTS DESIGNATED WITH A
IN
THE SCHEMATIC.
C
P-Board Layout
TNPA1738
P-Board Schematic
P-Board Voltages
IC866
IC881
IC891
IC896
1
. . . . . 5.16
A
. . . . . GND
1
. . . . . 4.00
1
. . . . . GND
2
. . . . . 4.03
R
. . . . . 2.49
2
. . . . . 0.00
2
. . . . . 0.00
3
. . . . 58.00
K
. . . . . 2.84
3
. . . . . 0.00
3
. . . . . 0.00
4
. . . . 64.00
4
. . . . . 0.00
4
. . . . . 0.00
5
. . . . . GND
5
. . . . . 9.41
Q861
Q867
Q871
B
0.00
.50
.62
C
136.00
0.00
0.00
E
GND
GND
GND
Q872
Q873
Q886
B
0.00
0.00
0.00
C
7.26
0.00
5.10
E
0.00
GND
GND
Q885
G
5.11
D
0.71
S
5.16
D
E
Notes:
The
above
boards
have
been
CHIP TRANSISTOR
LEAD DESIGNATION
modified to enhance and display
traces otherwise hidden by a mask.
Check Parts List for most recent
component values and part numbers.
Obtain
voltages
with
a
digital
multimeter.
Voltage Measurements
1.
Voltage measurement:
-
Voltage readings are nominal
and may vary ±10% on active
-
AC input to the Receiver is 120V.
devices.
Some
voltage
NTSC (HD, 1125i & 525P when
reading will vary with signal
applicable) signal generator is
connected to the antenna of the
strength and picture content.
-
Supply voltages are nominal.
Receiver. (Color bar pattern of
100 IRE white and 7.5 IRE black.)
2.
Ground
symbol
indicates
-
All Picture and Audio adjustments
ground lead connection of meter.
are set to Normalize.
Incorrect ground connection will
TV ANT/CABLE - (Set-Up Menu)
result in erroneous readings.
in TV/ANT Mode
CAUTION:
Incorrect
ground
Volume - Min.
connection of the test equipment
TV/Video SW - TV position
will result in erroneous readings.
Audio Mode - Stereo
Schematic Notes
1.
Resistors are carbon 1/4W unless
6.
(BOLD LINE) indicates
noted otherwise.
the route of B+ supply.
2.
Capacitors are ceramic 50V unless
7.
The
schematic
diagrams
are
noted otherwise.
current at the time of printing and
3.
Coil value notes is inductance in µH.
are subject to change without
4.
Test point indicated by
; Test point
notice.
but no pin .
8.
Ground symbol
indicates HOT
5.
Components indicated with
are
GROUND CONNECTION;
critical parts and replacement should
indicates COLD GROUND.
be made with manufacture specified
NOTE: All other component symbols
replacement parts only.
are used for engineering
design purposes.
F
G
M-Board Layout
M-Board Voltages
TNPA1734
IC3502
1
. . . . . 4.96
2
. . . . . 2.47
3
. . . . . 1.00
4
. . . . . 2.00
5
. . . . . 0.74
6
. . . . . 0.85
7
. . . . . GND
8
. . . . . 4.17
9
. . . . . 4.95
10
. . . . . 0.87
11
. . . . . 1.82
12
. . . . . 0.93
13
. . . . . 2.07
14
. . . . . 4.95
M-Board Schematic
K-Board Layout
TNPA1737
Boards Designation
• A-Board - Main Chassis
• C-Board - CRT Drive
• G-Board - Front Video Input
• JJ-Board - A/V Amp Interface
• K-Board - Customer Controls
• M-Board - DVD-TV CPU Interface
• P-Board - DVD Power Supply
• W-Board - DVD Unit Interface
K-Board Schematic
H
IC3501
1
. . . . . .4.96
2
. . . . . .3.27
3
. . . . . .0.00
4
. . . . . .0.00
5
. . . . . .0.22
6
. . . . . .4.95
7
. . . . . GND
8
. . . . . .4.17
9
. . . . . .4.96
10
. . . . . .0.79
11
. . . . . .0.79
12
. . . . . .4.96
13
. . . . . .2.69
14
. . . . . .4.95
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