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A
B
1
2
3
4
A-Board Voltage Measurements (ICs and Transistors)
IC001
IC002
IC551
1
. . . . . 4.56
33
. . . . . .n.c
1
. . . . . GND
1
. . . . 12.42
1
. . . . . 2.95
2
. . . . . 2.57
34
. . . . . .5.22
2
. . . . . GND
2
. . . . . GND
2
. . . . . 5.68
3
. . . . . 0.00
35
. . . . . .5.26
3
. . . . . GND
3
. . . . . 9.01
3
. . . . . 0.00
4
. . . . . 3.44
36
. . . . . .0.00
4
. . . . . GND
4
. . . . . 0.00
5
. . . . . 5.27
37
. . . . . .n.c
5
. . . . . 4.26
5
. . . . . 0.00
IC552
6
. . . . . 0.00
6
. . . . . 2.61
38
. . . . . GND
6
. . . . . 4.26
7
. . . . . 0.00
39
. . . . . .0.15
7
. . . . . GND
1
. . . . 12.42
7
. . . . . 9.01
8
. . . . .GND
40
. . . . . .4.37
8
. . . . . 5.27
2
. . . . . GND
8
. . . . . 3.17
3
. . . . . 4.99
9
. . . . . n.c
41
. . . . . .0.00
9
. . . . . 3.16
10
. . . . . 5.25
42
. . . . . .0.00
IC451
10
. . . . . 3.21
11
. . . . . 0.45
43
. . . . . .0.00
IC803
11
. . . . . 4.25
1
. . . . . 8.23
12
. . . . .GND
44
. . . . . .0.00
12
. . . . .GND
2
. . . . . 4.15
13
. . . . . 2.63
45
. . . . . .0.23
1
. . . . 89.23
13
. . . . . 3.27
3
. . . . . 4.12
2
. . . 131.37
14
. . . . . n.c
46
. . . . . .0.00
14
. . . . . 4.27
5
4
. . . . . 4.18
3
. . . 262.67
15
. . . . . n.c
47
. . . . . .n.c
15
. . . . . 4.27
5
. . . . . GND
4
. . . 131.13
16
. . . . . n.c
48
. . . . . .n.c
16
. . . . . 0.27
6
. . . . . 4.06
5
. . . 131.50
17
. . . . . 3.59
17
. . . . . n.c
49
. . . . . .n.c
7
. . . . . 3.94
18
. . . . . 0.59
50
. . . . . .n.c
18
. . . . . 4.97
8
. . . . 24.05
19
. . . . . n.c
51
. . . . . .n.c
19
. . . . . 2.76
9
. . . . . 2.01
20
. . . . . n.c
52
. . . . . .n.c
20
. . . . . 2.76
10
. . . . . n.c
21
. . . . . n.c
53
. . . . . .0.00
21
. . . . .GND
11
. . . . . GND
22
. . . . . 5.26
54
. . . . . **
22
. . . . . 1.69
12
. . . . 13.41
23
. . . . . 5.01
23
. . . . . 0.00
55
. . . . . .4.15
13
. . . . 24.54
24
. . . . . n.c
56
. . . . . .n.c
24
. . . . . 4.20
25
. . . . . 1.30
57
. . . . . .0.00
25
. . . . . 1.77
26
. . . . . 1.83
58
. . . . . .0.00
26
. . . . . 5.66
27
. . . . .GND
59
. . . . . .4.27
28
. . . . . n.c
60
. . . . . .4.28
** Probing pin may cause television shut
29
. . . . . n.c
61
. . . . . .5.27
30
. . . . . n.c
62
. . . . . **
down or blanking the CRT.
31
. . . . . 5.21
63
. . . . . .2.26
32
. . . . . n.c
64
. . . . . GND
C
k
k
IC101
IC2201
IC2303
Q001
Q002
Q003
Q004
27
. . . . . .n.c
1
. . . . . 1.29
1
. . . . . 6.27
B
0.72
5.94
5.07
5.26
28
. . . . . .3.21
2
. . . . . n.c
2
. . . . . GND
C
0.00
9.67
5.90
GND
29
. . . . . .2.70
3
. . . . . n.c
3
. . . . . 6.31
E
GND
5.27
5.94
5.25
30
. . . . . .2.77
4
. . . . . 2.21
4
. . . . . 0.00
31
. . . . . .4.68
5
. . . . . 2.19
5
. . . . . 0.76
Q304
Q430
Q451
Q452
32
. . . . . .2.14
6
. . . . . 0.28
6
. . . . . 8.96
33
. . . . . .3.04
7
. . . . . 5.01
7
. . . . . 9.03
B
3.04
0.37
0.63
0.00
34
. . . . . .2.63
8
. . . . . 2.26
8
. . . . . GND
C
9.01
2.82
0.00
3.27
35
. . . . . .3.50
9
. . . . . 2.34
9
. . . . . 9.12
E
2.41
GND
GND
GND
36
. . . . . .3.45
10
. . . . . 0.40
10
. . . . 19.45
37
. . . . . .9.01
11
. . . . . 2.26
Q551
Q801
Q804
Q802
38
. . . . . .4.04
12
. . . . . 3.31
IC2304
39
. . . . . .4.32
13
. . . . . 3.47
B
0.00
130.70
131.40
131.03
1
. . . . . 6.29
C
40
. . . . . .2.87
14
. . . . . 2.19
-11.82
130.27
131.60
0.63
2
. . . . . GND
E
131.40
41
. . . . . .4.39
15
. . . . . 3.44
GND
131.10
131.37
3
. . . . . 6.29
42
. . . . . .4.97
16
. . . . . 3.54
43
. . . . . .3.53
17
. . . . . GND
4
. . . . . 0.00
Q3001
5
. . . . . 0.76
44
. . . . . GND
18
. . . . . 4.28
6
. . . . . 8.94
B
0.00
45
. . . . . .0.44
19
. . . . . 4.27
7
. . . . . 9.00
C
8.97
46
. . . . . .6.09
20
. . . . . n.c
8
. . . . . GND
E
GND
47
. . . . . .4.09
21
. . . . . 2.26
9
. . . . . 9.09
48
. . . . . .2.13
22
. . . . . 2.25
10
. . . . 19.19
49
. . . . . .5.41
23
. . . . . n.c
50
. . . . . .0.90
24
. . . . . n.c
51
. . . . . .6.46
CHIP TRANSISTOR
52
. . . . . .4.15
LEAD DESIGNATION
D
E
A-Board Schematic -
CT-2005SB
Q302
Notes:
2.81
9.01
Check Parts List for most recent
2.21
component values and part numbers.
Q501
Obtain
voltages
with
a
digital
0.00
multimeter.
87.57
GND
Q2309
5.65
GND
Boards Designation
0.76
• A-Board - Main Board
F
G
4
2W
Voltage Measurements
Waveform Measurements
3
1.
Voltage measurement:
-
Voltage readings are nominal
1.
indicates waveform measurement.
and may vary ±10% on active
(Measurement can be taken at the
-
AC input to the Receiver is 120V.
devices.
Some
voltage
best accessible location in common
NTSC (HD, 1125i & 525P when
reading will vary with signal
to the indicated point.)
applicable) signal generator is
strength and picture content.
2.
Taken
with
an
NTSC
connected to the antenna of the
-
Supply voltages are nominal.
generator connected to the antenna
Receiver. (Color bar pattern of
100 IRE white and 7.5 IRE black.)
2.
Ground
symbol
indicates
terminal. (NTSC color bar pattern of
8 bars of EIA colors, 100 IRE white
-
All Picture and Audio adjustments
ground lead connection of meter.
and 7.5 IRE black.)
are set to Normalize.
Incorrect ground connection will
3.
Customer Controls (Picture/Audio
TV ANT/CABLE - (Set-Up Menu)
result in erroneous readings.
Menu) are set to Normalize. Volume
in TV/ANT Mode
CAUTION:
Incorrect
ground
Volume - Min.
is set to "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
IMPORTANT SAFETY NOTICE
noted otherwise.
current at the time of printing and
THIS SCHEMATIC DIAGRAM INCORPORATES SPECIAL FEATURES
3.
Coil value notes is inductance in
H .
are subject to change without
THAT ARE IMPORTANT FOR PROTECTION FROM X-RADIATION, FIRE
4.
Test point indicated by
; Test point
notice.
AND ELECTRICAL SHOCK HAZARDS. WHEN SERVICING IT IS
ESSENTIAL THAT ONLY MANUFACTURERS SPECIFIED PARTS BE
but no pin .
8.
Ground symbol
indicates HOT
USED FOR THE CRITICAL COMPONENTS DESIGNATED WITH A
5.
Components indicated with
are
GROUND CONNECTION;
THE SCHEMATIC.
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.
H
NC
k
k
k
k
k
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
signal
may vary depending on the type
of Oscilloscope used and its
settings.
5.
Ground symbol
shown on
waveform number indicates (Hot)
ground lead connection of the
Oscilloscope.
CAUTION:
Incorrect
ground
connection of the test equipment will
result in erroneous readings.
IN
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