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MODEL HT32744
Chassis No. 32744-00
SCHEMATIC DIAGRAMS
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.
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
32.5KV AT ZERO BEAM CURRENT AT 120 VOLTS AC LINE, AND MUST NOT EXCEED 34.6KV UNDER ANY
OPERATING CONDITION. SEE HIGH VOLTAGE CHECK ON PAGE 16.
INTEGRATED CIRCUITS
PHOTO COUPLERS
TRANSISTORS
TOP VIEW
TOP VIEW
B
B
B
B
E C
E C
E
C
E C
B
MARK
1
1
E
C
1
COUNT TERMINALS IN
ARROW DIRECTION
SIDE VIEW
C
E
E
E C
C
E
B
B
B
C
B
B ... BASE
C ... COLLECTOR
1
E ... EMITTER
1
1
CHIP TRANSISTORS
CHIP RESISTORS
TOP VIEW
TOP VIEW
C
B ... BASE
1
C ... COLLECTOR
1
3
3 2
E ... EMITTER
2
OUT
1
1
GND
(3)
IN
(2)
(1)
B
E
CAPACITOR AND RESISTOR CODE CHART
CAPACITOR (Example)
500 C K 1500 B
D ........................... ±0.5pF
T ............................ +50%
J ............................ ±5%
K ........................... ±10%
M ........................... ±20%
N ........................... ±30%
Characteristics
P ...........................
+100% –
Value code
Z ........................... +80%
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
— 61 —
BOARD CONNECTIONS
AND LOCATIONS
DIODES
A
K
A
K
A
K
A
K
K
A
K
A
INFRARED EMITTING
A....ANODE
K....CATHODE
3
12 x 10 = 12K ohm
SCHEMATIC
WAVEFORMS
10%
–
Composite Video
0%
–
20%
V PUMP
H-OUT (Collector)
— 62 —
W601
X
K6L
K6B
K6A
10
10
9
8
7
6
5
4
3
2
1
1
ASSY,PWB,P/D (Power & Deflection)
K4D
5
(247 X 330)
4
3
2
1
P04
K6J
4
4
3
2
1
1
K5B
12
X
12
4
11
3
KX
10
DY_COIL
2
9
8
1
7
6
5
FBT
4
3
2
1
1
FOCUS
SCREEN
K4C
X
K17J
K7C
K7U1
ASSY,PWB,VM
ASSY,PWB,SOCKET
(90 X 123.5)
(140 X 123.5)
P04
P04
K7D
K17VM
K17A
VM_COIL
(1)
(2)
(3)
(4)
C
Y
R
(5)
(6)
(7)
(8)
G
B
V-Drive (+) Out
V-Drive Out
(9)
(10)
(11)
(12)
R (CRT)
G (CRT)
B (CRT)
(13)
(14)
(15)
(16)
Heater
H-Drive (Base)
H-OUT (Base)
H-Drive (Collector)
(17)
(18)
(19)
V-OUT
PCC
A1
K6GND
KFRONT
KFRONT2
X
X
X
X
X
A2
ASSY,PWB,FRONT
(FOR SPARK)
X
1
L901
K1904
X
2
DEGAUSSING COIL
K1902
K6F
K6M
K1901
X
K9FRB
K9FRA
ASSY,PWB,MAIN
KMLR1
1
(247 X 330)
5
1
AUDIO_CTRL
4
2
3
3
K6PDA
2
4
4
P02
REGULATORS
10
CPU
1
10
KSLR2
9
8
7
1
1
6
REGULATORS
2
5
3
3
4
3
19
2
18
1
1
15
15
1
1
14
2
13
3
4
12
K6PDD
11
5
5
10
6
9
4
7
8
3
8
7
2
9
6
1
10
10
5
4
3
2
1
1
16
17
19
18
15
15
14
K6PDB
13
12
12
12
11
11
10
10
9
9
8
8
7
7
6
6
KCRT
5
5
X
4
4
5
3
3
4
2
2
KSPG2
3
1
1
1
1
X
2
1
16
1
1
KSLR1
17
2
KSPG1
3
X
4
4
KMLR2
(20)
(21)
(22)
B-Y
R-Y
WH OUT
(24)
(25)
(26)
2H (Lower)
2V (Lower)
2Y (Lower)
(28)
(29)
2(R-Y) (Lower)
VM
(Velocity Modulation)
— 63 —
P01
SP-L
SP901
+
K1903
1
1
-
2
+
3
SP-R
4
4
SP902
-
(5W,6X12)
DM
(23)
WV OUT
(27)
2(B-Y) (Lower)
— 64 —
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