MODEL DS20930 Chassis No. 20930-00
SCHEMATIC DIAGRAMS
NOTES ON SCHEMATIC DIAGRAM
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 on VHF channel 5, all controls at normal. Line voltage at 220 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. Symbol indicates a fusible resistor, which protects the circuit from possible short circuits.
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.
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.
X-RADIATION WARNING NOTE
THIS TV CONTAINS CRITICAL PARTS TO PROTECT AGAINST X-RADIATION. NOMINAL 2ND ANODE VOLTAGE IS
26.5KV AT ZERO BEAM CURRENT AT 120 VOLTS AC LINE, AND MUST NOT EXCEED 28.0KV UNDER ANY
OPERATING CONDITION. SEE HIGH VOLTAGE CHECK ON PAGE 8.
1
1
1
1
TOP VIEW
SIDE VIEW
COUNT TERMINALS IN
ARROW DIRECTION
MARK
E
C
B
AK
A
K
AK
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
EC
B
EC
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
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
IC101 pin-17
(R-Output)
IC101 pin-18
(G-Output)
IC101 pin-19
(B-Output)
IC101 pin-52
(Video Input)
IC501 pin-5
(Vertical Output)
IC501 pin-1
(Inverting Input)
Q202-E (TP16)
(Inverting Video)
T402 pin-9
(Heater)
Q401-B
(Horizontal Drive)
Q402-B
(Horizontal Output)
Q601-G
(Power Switching)
WAVEFORMS
Note: Voltages were measured with color-bar signal and controls set for normal picture.
3.4Vp-p Horiz. 3.4Vp-p Horiz.
3.4Vp-p Horiz. 1.0Vp-p Horiz.
50.4Vp-p Vert.
0.6Vp-p Vert.
1.0Vp-p Horiz.
1.0Vp-p Horiz.
18.2Vp-p Horiz.
15Vp-p 50KHz
29.6Vp-p Horiz.
Device/Pin # Volts/Mode
D612-1 POWE ON: POWER OFF
30.0 10.5
D612-2
POWE ON: POWER OFF
29.0 9.4
D612-3 POWE ON: POWER OFF
0.7 0.4
D612-4
POWE ON: POWER OFF
16.0 1.7
IC001-1 6.5
IC001-2 15.2
IC001-3 6.3
IC001-4 GND
IC001-5 N.C.
IC001-6 1.4
IC001-7 1.4
IC001-8 GND
IC101-1 GND
IC101-2 GND
IC101-3 GND
IC101-4 GND
IC101-5 GND
IC101-6 5.1
IC101-7 2.1
IC101-8 2.7
IC101-9 3.8
IC101-10 3.6
IC101-11 4.3
IC101-12 1.5
IC101-13 1.5
IC101-14 1.4
IC101-15 0.2
IC101-16 8.2
IC101-17 2.5
IC101-18 2.2
IC101-19 2.4
IC101-20 GND
IC101-21 GND
IC101-22 GND
IC101-23 GND
IC101-24 GND
IC101-25 N.C.
IC101-26 2.1
IC101-27 2.6
IC101-28 5.3
IC101-29 2.7
IC101-30 0.4
IC101-31 GND
IC101-32 N.C.
IC101-33 1.0
IC101-34 1.8
IC101-35 N.C.
IC101-36 5.0
IC101-37 4.3
IC101-38 4.7
IC101-39 GND
IC101-40 0
IC101-41 GND
IC101-42
GND
IC101-43 GND
IC101-44 2.3
Device/Pin # Volts/Mode
IC101-45 3.6
IC101-46 2.1
IC101-47 3.1
IC101-48 GND
IC101-49 2.5
IC101-50 GND
IC101-51 GND
IC101-52 2.6
IC101-53 5.1
IC101-54 2.9
IC101-55 2.6
IC101-56 2.5
IC101-57 GND
IC101-58 3.6
IC101-59 4.4
IC101-60 4.4
IC101-61 GND
IC101-62 GND
IC101-63 GND
IC101-64 GND
IC101-65 2.4
IC101-66 2.2
IC101-67 2.2
IC101-68 0
IC101-69 3.2
IC101-70 GND
IC101-71 GND
IC101-72 GND
IC101-73 2.3
IC101-74 GND
IC101-75 2.2
IC101-76 2.6
IC101-77 2.2
IC101-78 2.9
IC101-79 2.9
IC101-80 GND
IC501-1 2.5
IC501-2 26.2
IC501-3 2.4
IC501-4 GND
IC501-5 12.8
IC501-6 26.6
IC501-7 2.5
IC601-1 130.0
IC601-2 29.2
IC601-3 GND
IC681-1 13.4
IC681-2 GND
IC681-3 5.0
IC801-1 4.0
IC801-2 3.9
IC801-3 4.9
IC801-4 0
IC801-5 0
IC801-6 0.3
IC801-7 0
IC801-8 0
IC801-9 0
IC801-10 4.9
Device/Pin # Volts/Mode
IC801-11 GND
IC801-12 4.8
IC801-13 GND
IC801-14 4.9
IC801-15 1.9
IC801-16 0.2
IC801-17 2.1
IC801-18 GND
IC801-19 2.2
IC801-20 2.0
IC801-21 GND
IC801-22 4.9
IC801-23 GND
IC801-24 GND
IC801-25 4.8
IC801-26 0.3
IC801-27 POWE ON: POWER OFF
4.9 0
IC801-28 3.9
IC801-29 2.6
IC801-30 0
IC801-31 4.9
IC801-32 3.6
IC801-33 4.9
IC801-34 3.7
IC801-35 4.8
IC801-36 4.9
IC801-37 4.9
IC801-38 4.8
IC801-39 0.2
IC801-40 0
IC801-41 0
IC801-42 0
IC802-1 GND
IC802-2 GND
IC802-3 GND
IC802-4 GND
IC802-5 4.9
IC802-6 4.9
IC802-7 GND
IC802-8 5.0
IC1081-1 2.5
IC1081-2 2.9
IC1081-3 2.5
IC1081-4 3.0
IC1081-5 2.5
IC1081-6 GND
IC1081-7 GND
IC1081-8 GND
IC1081-9 0
IC1081-10 0
IC1081-11 0
IC1081-12 2.9
IC1081-13 2.5
IC1081-14 2.9
IC1081-15 2.9
IC1081-16 9.3
VOLTAGE CHARTS
Note: Voltages were measured with color-bar signal and controls set for normal picture.
Device/Pin # Volts/Mode
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
IC34101-33 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
IC34
01-41
4.1
IC3401-42 GND
IC3401-43 4.1
IC3401-44 4.1
IC3401-45 4.2
IC
34
01-46 GND
IC3401-47 4.1
IC3401-48 4.1
Q001-B
POWER ON: POWER OFF:
0.7 0
Q001-C
POWER ON: POWER OFF:
0 6.3
Q001-E GND
Q005-B 15.0
Q005-C 15.7
Q005-E 15.8
Q135-B 2.7
Q135-C 5.2
Q135-E 2.0
Device/Pin # Volts/Mode
Q202-B 2.3
Q202-C GND
Q202-E 3.0
Q208-B 2.5
Q208-C GND
Q208-E 3.1
Q401-B 0.3
Q401-C 39.4
Q401-E GND
Q402-B 3.2
Q402-C 132.4
Q402-E
-
0.2
Q486-B 9.9
Q486-C 11.6
Q486-E 9.2
Q490-B 5.9
Q490-C 7.3
Q490-E 5.2
Q601-G
POWER ON: POWER OFF:
0.1
0
Q601-D
POWER ON: POWER OFF:
163.5 170.0
Q601-S
POWER ON: POWER OFF:
5.6 0.5
Q611-B
POWER ON: POWER OFF:
4.6
0.8
Q611-C
POWER ON: POWER OFF:
15.7 1.7
Q611-E
POWER ON: POWER OFF:
5.7 0.4
Q612-B
POWER ON: POWER OFF:
5.4 0.8
Q612-C GND
Q612-E
POWER ON: POWER OFF:
5.7
0.4
Q613-B
POWER ON: POWER OFF:
0.2 0.1
Q613-C
POWER ON: POWER OFF:
5.4
0.9
Q613-E GND
Q627-B
POWER ON: POWER OFF:
12.7 8.0
Q627-C
POWER ON: POWER OFF:
13.2 0
Q627-E
POWER ON: POWER OFF:
13.3 8.1
Q635-B
POWER ON: POWER OFF:
4.0 1.3
Q635-C
POWER ON: POWER OFF:
29.0 9.0
Q635-E
POWER ON: POWER OFF:
4.0 1.3
Q681-B
POWER ON: POWER OFF:
0.7 0
Q681-C
POWER ON: POWER OFF:
0 8.1
Q681-E GND
Device/Pin # Volts/Mode
Q693-B
POWER ON: POWER OFF:
0.6 6.7
Q693-C
POWER ON: POWER OFF:
28.9 7.8
Q693-E
POWER ON: POWER OFF:
2.6 6.1
Q695-B
POWER ON: POWER OFF:
28.9 8.8
Q695-C GND
Q695-E
POWER ON: POWER OFF:
28.9
9.2
Q701-B 2.4
Q701-C 145.5
Q701-E 2.3
Q711-B 2.5
Q711-C 146.6
Q711-E 2.3
Q721-B 2.5
Q721-C 140.2
Q721-E 2.4
Q831-B 4.5
Q831-C 5.1
Q831-E 5.1
Q1071-B 2.9
Q1071-C GND
Q1071-E 3.6
