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A
B
1
2
3
4
1. Voltage measurement:
-
AC input to the Receiver is 120V.
5
NTSC (HD, 1125i & 525P when
Boards Designation
applicable) signal generator is
connected to the antenna of the
Receiver. (Color bar pattern of
• A-Board - Main Chassis
100 IRE white and 7.5 IRE black.)
• C-Board - CRT Drive
-
All Picture and Audio adjustments
are set to Normalize.
TV ANT/CABLE - (Set-Up Menu)
in TV/ANT Mode
Volume - Min
TV/Video SW - TV position
Audio Mode - Stereo
C
Voltage Measurements
Schematic Notes
-
Voltage readings are nominal
1. Resistors are carbon 1/4W unless
6.
and may vary ±10% on active
noted otherwise.
devices.
Some
voltage
2. Capacitors are ceramic 50V unless
7. The schematic diagrams are current
reading will vary with signal
noted otherwise.
strength and picture content.
3. Coil value notes is inductance in H.
-
Supply voltages are nominal.
4. Test point indicated by
; Test point but
8. Ground symbol
2. Ground symbol
indicates ground
no pin .
5. Components indicated with
are
lead connection of meter.
critical parts and replacement should
Incorrect ground connection will
be made with manufacture specified
result in erroneous readings.
replacement parts only.
CAUTION:
Incorrect
ground
connection of the test equipment
will result in erroneous readings.
D
E
A-Board Schematic (Left Portion)
Waveform Measurements
3
(BOLD LINE) indicates the
1.
indicates waveform measurement.
5. Ground
symbol
route of B+ supply.
(Measurement can be taken at the
waveform number indicates (Hot)
best accessible location in common
ground lead connection of the
at the time of printing and are
to the indicated point.)
Oscilloscope.
subject to change without notice.
2. Taken with an NTSC signal generator
CAUTION:
Incorrect
indicates HOT
connected to the antenna terminal.
connection of the test equipment will
GROUND CONNECTION;
(NTSC color bar pattern of 8 bars of
result in erroneous readings.
indicates COLD GROUND.
EIA colors, 100 IRE white and 7.5
IRE black.)
NOTE: All other component symbols
3. Customer
Controls
(Picture/Audio
are used for engineering
Menu) are set to Normalize. Volume
design purposes.
is set to "MIN".
4. All video and color waveforms are
taken with a wideband scope and a
probe with low capacitance (10 to 1).
Shape and peak altitudes may vary
depending
on
the
type
of
Oscilloscope used and its settings.
F
G
shown
on
ground
IMPORTANT SAFETY NOTICE
CHIP TRANSISTOR
LEAD DESIGNATION
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.
H
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