POWER ON:
POWER OFF:
Q695-B
27.4
7.4
Q695-C
GND
POWER ON:
POWER OFF:
Q695-E
27.5
8.0
Q701-B
2.4
Q701-C
154.9
Q701-E
2.2
Q711-B
2.4
Q711-C
158.0
Q711-E
2.2
Q721-B
2.3
Q721-C
159.0
Q721-E
2.2
Q831-B
4.2
Q831-C
4.9
Q831-E
4.9
MODEL DS20424 Chassis No. 20424-00
SCHEMATIC DIAGRAMS
CAPACITOR AND RESISTOR CODE CHART
CAPACITOR (Example)
500 C K 1500 B
D ........................... ±0.5pF
T ............................ +50%
–
10%
J ............................ ±5%
K ........................... ±10%
M ........................... ±20%
N ........................... ±30%
Characteristics
P ...........................
+100% –
0%
Value code
Z ........................... +80%
–
20%
Tolerance code
C ........................... ±0.25pF
Material code
C ........................... Ceramic
Voltage rating
E ........................... Electrolytic
F ........................... Polyester
N ........................... Polypropylene
T ............................ Tantalum
K ........................... Ceramic
H ........................... MT-Composite
P ........................... NP. Electrolytic
M ........................... MT-Polypropylene
RESISTOR (Example)
6 Y K 4.7
D ........................... ±0.5%
F ........................... ±1%
G ........................... ±2%
J ............................ ±5%
Value code
K ........................... ±10%
Tolerance code
M ........................... ±20%
Material code
F ............................ Fusible
Wattage rating
N ........................... Metalized Carbon
S ........................... Oxide Metalized
Y ........................... Wire Wound
C ........................... Solid
D ........................... Carbon Film
W .......................... Wire Wound
— 25 —
— 26 —
— 28 —
— 27 —
FOR CONTINUED PROTECTION AGAINST
A RISK OF FIRE, REPLACE ONLY WITH
THE SAME TYPE 4A, 125V FUSE.
ATTENTION: POUR MAINTENIR LA PROTECTION
CONTRE LES RISQUES D' INCENDIE UTILISER UN
FUSIBLE DE RECHANGE DE MEME TYPE 4A, 125V.
CAUTION
4A 125V
BLOCK DIAGRAM
STANDBY MODE
5V
CONTROL
Q693,
Q695
D612
PHOTO
COUPLER
IC601
POWER
REG.
Q681
12V SW
DRIVE
IC681
5V REG.
D601-D604
FULL WAVE
RECTIFIER
Q613
ERR.
AMP.
Q601
SW.
T601
CONVERTER
TRANS.
LF601
LINE
FILTER
PS601
POSISTOR
L901
DEGAUSING
COIL
AC120V
60Hz
F601
AC
FUSE
C601
+130V
+26V
D624
TJ1
D625
D623
4A 125V
+12V
Q627
12V SW.
12
47
21
17
44
H-PULSE
H-DRIVE
V-DRIVE
ABL IN
ABL
ACL IN
Pb IN
Pr IN
C IN
C0MP-Y IN
13
14
G
R
B
g8tjm
IC001
AUDIO
AMP.
7
L
6
2
1
SP901
LEFT
SPEAKER
Q486
9V REG.
Q490
5V REG.
5V
ALWAYS
12V
9V
TJ5
5V
B6
D801
Q001
POWER OFF
NOISE
CANCEL
RL601
RELAY
+12V
4
3
LS OUT-R
LS OUT-L
37
36
13
IC3401
MTS DECODER
5
6
SDA
SCL
Y
C
S-SW
VIDEO IN-2
AUDIO IN-2 (L)
K1001
REAR
AV IN
(AV2)
VIDEO IN-2 (R)
Y
Pb
COMPONENT
Pr
VIDEO IN-1
AUDIO IN-1 (L)
K1011
FRONT
AV IN
(AV 1)
AUDIO IN-1 (R)
34
33
K1051
S-VIDEO IN
AUDIO +B
Q005
AUDIO +B
SWITCH
3
SP902
RIGHT
SPEAKER
POWER
FAIL
POWER ON/OFF
25
29
63
60
Q132
BUFFER
Q131
BUFFER
TP16
56
64
IC802
EEPROM
Q831
RESET
6
5
A1901
RC PRE-AMP
SW1901-1906
CONTROL KEYS
BUS SCL
BUS SDA
IIC SCL
IIC SDA
RC IN
KEY IN
S-SW
X IN
X OUT
X 801
C863
C862
A101
UHF/VHF TUNER
WITH PLL
& BAND SW
IF
AGC
ANT
X141
SAW
FILTER
VIDEO
DET.
VIDEO
SW.
VIDEO
AMP.
V
DRIVE
H
DRIVE
FM
DET.
FM
AMP.
I/O
PORTS
VIDEO
MATRIX
I/O
PORTS
CLOCK
CONTROL
SYNC
SEP.
RGB
DRIVE
CUT/
OFF
32
61
39
31
36
26
28
27
40
RESET
33
34
S-Y IN
46
AV1/2S
IC1001
AV SW
23
54
5
3 V2 IN
V1 IN
1
2
7
MUTE
24
45
49
48
51
37
10
IC501
VERT.
OUTPUT
Q401
HORIZ.
DRIVE
T401
H-DRIVE
TRANS.
Q402
HORIZ.
OUTPUT
HOLD DOWN
DETECT.
HOLD DOWN
T402
HORIZ.
OUTPUT
TRANS.
H.V.
DEFLECTION
YOKE
L902
ABL
FOCUS
SCREEN
HEATER
LOW +B
AUDIO +B
+200V
6/7
9
5
8
4
1
V
H
2
Q721
Q711
Q701
-R OUT
-G OUT
-B OUT
Q901
PIX TUBE
(7V)
D429
D428
(13V)
R428
ANODE LEAK
DETECT.
R
D482
5
POWER FAIL
D002
15V
D471
D481
D806
H-PULSE
WAVEFORMS
Note: Voltages were measured with offset color-bar signal and controls set for normal picture.
IC801-
12
(R-Output)
4.0V HORIZ
IC801-
13
(G-Output)
3.8V HORIZ
IC801-
14
(B-Output)
4.0V HORIZ
IC801-
54
(Video Input)
1.0V HORIZ
IC501- 5
(Vertical Output)
48 VERT
IC501- 1
(Inverting Input)
0.6V VERT
Q132-E (TP16)
(Internal Video)
1.0V HORIZ
Q401- B
(Horizontal Drive)
.7V HORZ
Q402- B
(Horizontal Output)
21V HORZ
T402- 9
(Heater)
28V HORIZ
Q601- G
(Power Switching)
15V 50KHz
VOLTAGE CHARTS
NOTE: Voltages were measured using color-bar signal and the controls set for normal picture.
SERVICE NOTES:
1. When replacing parts on circuit boards, clamp the lead wires to terminals before soldering.
2. When replacing high wattage resistors on circuit board, keep the resistor body 10 mm (3/8) from circuit board.
3. Keep wires away from high voltage and high temperature components.
PRODUCT SAFETY NOTICE
THE COMPONENTS DESIGNATED BY A STAR (
★
) ON THIS SCHEMATIC DIAGRAM DESIGNATE COMPONENTS
WHOSE VALUES ARE OF SPECIAL SIGNIFICANCE TO PRODUCT SAFETY. SHOULD ANY COMPONENT
DESIGNATED BY A STAR NEED TO BE REPLACED, USE ONLY THE PART DESIGNATED IN THE PARTS LIST. DO NOT
DEVIATE FROM THE RESISTANCE, WATTAGE AND VOLTAGE RATINGS SHOWN.
X-RADIATION WARNING NOTE
THIS TV CONTAINS CRITICAL PARTS TO PROTECT AGAINST X-RADIATION. NOMINAL 2ND ANODE VOLTAGE IS
29.1KV AT ZERO BEAM CURRENT AT 120 VOLTS AC LINE, AND MUST NOT EXCEED 31.1KV UNDER ANY
OPERATING CONDITION. SEE HIGH VOLTAGE CHECK ON PAGE 9.
1
1
1
1
TOP VIEW
SIDE VIEW
COUNT TERMINALS IN
ARROW DIRECTION
MARK
E
C
B
A
K
A
K
A
K
A
K
A
K
A
K
INFRARED EMITTING
A....ANODE
K....CATHODE
INTEGRATED CIRCUITS
TRANSISTORS
1
DIODES
PHOTO COUPLERS
B ... BASE
C ... COLLECTOR
E ... EMITTER
E C
B
E C
B
E
C
B
E
C
B
E C
B
E
C
B
E C
B
E
C
B
3
2
1
3 2
1
GND
(2)
IN
(1)
OUT
(3)
1
1
TOP VIEW
1
CHIP TRANSISTORS
B
C
E
TOP VIEW
B ... BASE
C ... COLLECTOR
E ... EMITTER
CHIP RESISTORS
TOP VIEW
123
12 x 10 = 12K ohm
3
NOTES ON SCHEMATIC DIAGRAMS
1. All resistance values in ohms K=1,000 M=1,000,000.
2. Unless otherwise noted on schematic, all capacitor values less than 1 are expressed in µF (Micro Farad),
and the values more than 1 are in pF.
3. Unless otherwise noted on schematic, voltage reading taken with VOM from point indicated to chassis
ground. Voltage reading taken using color-bar signal VHF channel 5, all controls at normal. Line voltage at 120
volts. Some voltages may vary with signal strength.
4. Waveforms were taken with color-bar signal and controls set for normal picture. Waveforms marked with
an
✽
may vary with signal strength.
5. The Symbol indicates a fusible resistor, which protects the circuit from possible short circuits.
Device/Pin #
Volts/Mode
IC801-24
1.5
IC801-25
4.9
IC801-26
0
IC801-27
0
IC801-28
0
IC801-29
4.8
IC801-30
4.9
IC801-31
4.1
IC801-32
4.0
IC801-33
1.9
IC801-34
2.6
IC801-35
4.9
IC801-36
0
IC801-37
0
IC801-38
1.8
IC801-39
4.9
IC801-40
4.9
IC801-41
3.3
IC801-42
GND
IC801-43
0
IC801-44
1.2
IC801-45
2.5
IC801-46
2.6
IC801-47
0
IC801-48
2.6
IC801-49
0.3
IC801-50
2.8
IC801-51
0.3
IC801-52
5.0
IC801-53
3.5
IC801-54
2.6
IC801-55
5.0
IC801-56
2.5
IC801-57
2.6
IC801-58
2.3
IC801-59
2.8
IC801-60
2.4
IC801-61
1.8
IC801-62
GND
IC801-63
2.8
IC801-64
2.8
IC802-1
GND
IC802-2
GND
IC802-3
GND
IC802-4
GND
IC802-5
0
IC802-6
0
IC802-7
GND
IC802-8
5.0
IC1001-1
2.5
IC1001-2
0
IC1001-3
2.5
IC1001-4
0
IC1001-5
0
IC1001-6
5.0
IC1001-7
1.8
IC1001-8
GND
IC3401-1
4.1
IC3401-2
4.1
IC3401-3
4.1
IC3401-4
4.1
IC3401-5
3.6
IC3401-6
3.7
IC3401-7
GND
IC3401-8
4.1
IC3401-9
4.1
IC3401-10
4.1
IC3401-11
4.1
IC3401-12
4.9
IC3401-13
4.1
IC3401-14
1.3
IC3401-15
1.3
IC3401-16
0
IC3401-17
GND
IC3401-18
3.2
IC3401-19
9.1
IC3401-20
0
IC3401-21
4.1
IC3401-22
4.1
IC3401-23
3.7
IC3401-24
3.9
IC3401-25
4.1
IC3401-26
4.1
IC3401-27
4.1
IC3401-28
1.9
IC3401-29
4.1
IC3401-30
4.1
IC3401-31
2.0
IC3401-32
4.1
IC3401-33
4.1
IC3401-34
4.1
IC3401-35
0
IC3401-36
4.1
IC3401-37
4.1
IC3401-38
4.1
IC3401-39
4.1
IC3401-40
4.1
IC3401-41
4.1
IC3401-42
GND
IC3401-43
4.1
IC3401-44
4.1
IC3401-45
4.2
IC3401-46
GND
IC3401-47
4.1
IC3401-48
4.1
Device/Pin #
Volts/Mode
POWER ON:
POWER OFF:
D612-1
25.7
9.6
POWER ON:
POWER OFF:
D612-2
24.8
8.0
POWER ON:
POWER OFF:
D612-3
0.7
0.4
POWER ON:
POWER OFF:
D612-4
14.7
1.7
IC001-1
6.0
IC001-2
13.2
IC001-3
5.6
IC001-4
GND
IC001-5
N.C.
IC001-6
1.4
IC001-7
1.4
IC001-8
GND
IC501-1
GND
IC501-2
14.3
IC501-3
29.5
IC501-4
2.9
IC501-5
2.9
IC501-6
29.2
IC501-7
2.8
IC601-1
130.0
IC601-2
28.3
IC601-3
GND
IC681-1
13.4
IC681-2
GND
IC681-3
5.0
IC801-1
2.5
IC801-2
2.5
IC801-3
3.2
IC801-4
2.4
IC801-5
2.2
IC801-6
2.2
IC801-7
2.2
IC801-8
5.1
IC801-9
2.5
IC801-10
9.2
IC801-11
8.1
IC801-12
2.3
IC801-13
2.4
IC801-14
2.6
IC801-15
2.2
IC801-16
2.2
IC801-17
2.3
IC801-18
1.7
IC801-19
5.1
IC801-20
2.7
IC801-21
0.5
IC801-22
GND
IC801-23
.04
Device/Pin #
Volts/Mode
POWER ON:
POWER OFF:
Q001-B
0.7
0
POWER ON:
POWER OFF:
Q001-C
1.9
17.0
Q001-E
GND
Q005-B
13.4
Q005-C
14.0
Q005-E
14.0
Q131-B
2.2
Q131-C
9.2
Q131-E
1.5
Q132-B
1.2
Q132-C
GND
Q132-E
1.9
Q401-B
0.3
Q401-C
52.1
Q401-E
GND
Q402-B
0
Q402-C
130
Q402-E
GND
Q486-B
9.9
Q486-C
11.6
Q486-E
9.2
Q490-B
5.9
Q490-C
6.7
Q490-E
5.2
POWER ON:
POWER OFF:
Q601-G
5.8
0.4
POWER ON:
POWER OFF:
Q601-D
157
164
POWER ON:
POWER OFF:
Q601-S
.9
0
POWER ON:
POWER OFF:
Q613-B
0.3
0.1
POWER ON:
POWER OFF:
Q613-C
4.7
0.1
Q613-E
GND
POWER ON:
POWER OFF:
Q627-B
12.7
8.0
POWER ON:
POWER OFF:
Q627-C
13.2
0
POWER ON:
POWER OFF:
Q627-E
13.3
8.0
POWER ON:
POWER OFF:
Q681-B
0.7
0
POWER ON:
POWER OFF:
Q681-C
0
6.0
Q681-E
GND
POWER ON:
POWER OFF:
Q693-B
0.5
5.2
POWER ON:
POWER OFF:
Q693-C
27.4
7.1
POWER ON:
POWER OFF:
Q693-E
0.6
4.7
Device/Pin #
Volts/Mode
Device/Pin #
Volts/Mode
