Block Diagram; Voltage Charts; Waveforms; Schematic Diagrams - Sanyo DS31520 Service Manual

MODEL DS31520 Chassis No. 31520-00

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 adjusted 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
29.0KV AT ZERO BEAM CURRENT AT 120 VOLTS AC LINE, AND MUST NOT EXCEED 30.0KV UNDER ANY
OPERATING CONDITION. SEE HIGH VOLTAGE CHECK ON PAGE 8.
INTEGRATED CIRCUITS PHOTO COUPLERS
TRANSISTORS
TOP VIEW
TOP VIEW
B B B B
E C E C B
E C E C
MARK 1 1 E C
1
COUNT TERMINALS IN
ARROW DIRECTION
SIDE VIEW
C E
E
C E C
B B C E
B
B
B ... BASE
C ... COLLECTOR
1
1 E ... EMITTER
1
CHIP TRANSISTORS CHIP RESISTORS
TOP VIEW TOP VIEW
C
B ... BASE
1
C ... COLLECTOR
1 3 3 2 OUT E ... EMITTER
2
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
— 25 —

BLOCK DIAGRAM

ANT
A101
IF
UHF/VHF TUNER
WITH PLL
AGC
& BAND SW
RF AGC
1
28
BUS SCL
34
BUS SDA
32
6 IIC SCL
33
IC802
7 IIC SDA
EEPROM 31
RC IN
A1901
10
RC PRE-AMP
KEY IN
SW1901-1906
9
CONTROL KEYS
C809 IC801
X IN
CPU
19
WITH
CAPTION
C808
X OUT DECODER
20
X 801
DIODES
+12V
A K
A K
Q688
RELAY
DRIVER
A K
RL601
A K PS601
L901
RELAY
POSISTOR
DEGAUSING
COIL
K
T601
A CONVERTER
F601 LF601 TRANS.
AC LINE
A AC120V
K
FUSE FILTER
60Hz
Q601
INFRARED EMITTING
SW.
C601
A....ANODE
D601-D604
FULL WAVE Q604
K....CATHODE
RECTIFIER OSC
Q605
ERR.
4A 125V
AMP.
3
12 x 10 = 12K ohm

VOLTAGE CHARTS

NOTE: Voltages were measured using color-bar signal and the controls adjusted for normal picture.
Device/Pin # Volts/Mode Device/Pin # Volts/Mode
POWER ON: POWER OFF: IC101-43 GND
D612-1
31.9 10.9
IC101-44 2.2
IC101-45 3.7
POWER ON: POWER OFF:
D612-2
31.0 9.8 IC101-46 2.0
IC101-47 3.0
POWER ON: POWER OFF:
D612-3
–.3 0.6 IC101-48 0
IC101-49 2.5
POWER ON: POWER OFF:
D612-4 IC101-50 GND
13.3 1.4
– 10%
IC101-51 GND
IC002-1 4.5
IC101-52 2.8
IC002-2 10.3
IC101-53 5.2
IC002-3 4.6
IC101-54 2.7
IC002-4 GND
IC101-55 2.7
IC002-5 0
IC101-56 2.3
0%
IC002-6 1.4
IC101-57 GND
IC002-7 1.4
– 20%
IC101-58 3.6
IC002-8 GND
IC101-59 4.4
IC101-1 GND
IC101-60 4.4
IC101-2 GND
IC101-61 GND
IC101-3 GND
IC101-62 GND
IC101-4 GND
IC101-63 GND
IC101-5 GND
IC101-64 GND
IC101-6 5.1
IC101-65 2.5
IC101-7 2.0
IC101-66 2.3
IC101-8 2.6
IC101-67 1.9
IC101-9 3.6
IC101-68 2.5
IC101-10 3.7
IC101-69 3.2
IC101-11 4.0
IC101-70 GND
IC101-12 1.5
IC101-71 GND
IC101-13 1.5
IC101-72 GND
IC101-14 1.5
IC101-73 2.3
IC101-15 0
IC101-74 0
IC101-16 8.3
IC101-75 2.3
IC101-17 2.5
IC101-76 2.7
IC101-18 2.5
IC101-77 2.3
IC101-19 2.5
IC101-78 2.9
IC101-20 2.25
IC101-79 2.9
IC101-21 GND
IC101-80 GND
IC101-22 GND
IC301-1 0.9
IC101-23 GND
IC301-2 4.8
IC101-24 GND
IC301-3 2.0
IC101-25 2.0
IC301-4 0
IC101-26 2.4
IC301-5 5.1
IC101-27 2.6
IC301-6 5.1
IC101-28 5,3
IC301-7 0.3
IC101-29 2.8
IC301-8 –0.3
IC101-30 0.6
IC301-9 0.6
IC101-31 GND
IC301-10 0
IC101-32 4.9
IC301-11 0
IC101-33 1.0
IC301-12 1.5
IC101-34 1.8
IC301-13 GND
IC101-35 4.8
IC301-14 1.9
IC101-36 3.9
IC301-15 0
IC101-37 4.0
IC301-16 1.5
IC101-38 4.7
IC501-1 GND
IC101-39 GND
IC501-2 13.7
IC101-40 0
IC501-3 27.1
IC101-41 GND
IC501-4 2.9
IC101-42 GND
IC501-5 2.9
— 26 —
CAUTION
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
4A 125V
FUSIBLE DE RECHANGE DE MEME TYPE 4A, 125V.
SDL
5
SCL
6
13
C1/C2
INT. VIDEO
H-S
V-S
Q135 Q202
BUFFER BUFFER
IC101
SIGNAL PROCESS
SDA 9
MUTE
2
BUS
38
SCL 10
INTERFACE
S1-SW 4.5MHz
12
X141 78/79 SOUND
FM 75
SAW TRAP
S2-SW DET.
35 FILTER
RF AGC 77
56 VIDEO
VIDEO
11
MAIN AV 1/2
ACL DET.
5
Y 52
36
VIDEO
C 54
SW. 37
33
Q208 V
49
BEAM
SYNC 26
VOLTAGE
SEP.
DETECT. CAP
VIDEO
ABL-IN H
C Y
OUT
30
HORIZ.
DRIVER
12 16 14
IN SELECT 2
DELAY
13 3
LINE
COMB 1
FILTER
15 7 SC
OUT SELECT
BLACK 30
11
H PULSE STRETCH
9
S CLOCK 3.58 44 SHARP
BPA
40 HOLD DOWN
Y CV IN
17
OSD (R)
COLOR
42 CONT
OSD (G) DEMOD
BRITE
41
OSD (B)
12 17
40
OSD (BLK)
RGB
13 18
39
OUT
RESET OSD
Q831 14
19
25 SW.
RESET
AFT S-CURVE
15
29
RESET
POWER FAIL
8
3
POWER
27
ON/OFF
5V
IC681 32 5V
ALWAYS
5V REG. B9
B9
D694
D621 +16V
Q681
+130V 12V SW
12V
D624 DRIVE
D627
B4
D625
IC601
+12V D801
Q486
9V
POWER Q635
9V REG.
D612 REG. OVERLOAD
Q627
PROTECT.
PHOTO
12V SW.
COUPLER
5V
Q490
STANDBY MODE 5V REG. B6
Q693,
ALWAYS +5V
Q695
CONTROL
Device/Pin # Volts/Mode Device/Pin # Volts/Mode
IC501-6 26.2 IC802-1 GND
IC802-2 GND
IC501-7 3.0
IC501-8 2.9 IC802-3 GND
IC501-9 2.9 IC802-4 GND
IC501-10 13.3 IC802-5 4.9
IC802-6 4.9
POWER ON: POWER OFF:
IC601-1
129.2 92.5 IC802-7 GND
IC802-8 4.9
POWER ON: POWER OFF:
IC601-2
IC1001-1 0
31.1 9.8
IC1001-2 0
IC601-3 GND
IC1001-3 6.5
IC681-1 POWER ON: POWER OFF:
IC1001-4 6.5
(IN) 11.6 7.3
IC1001-5 6.5
IC681-2 GND
IC1001-6 GND
IC681-3
POWER ON: POWER OFF:
IC1001-7 GND
(OUT) 5.0 5.0
IC1001-8 GND
IC801-1 4.0
IC1001-9 0
IC801-2 3.9
IC1001-10 0
IC801-3 4.9
IC1001-11 9.3
IC801-4 9.1
IC1001-12 0.7
IC801-5 0
IC1001-13 2.5
IC801-6 0
IC1001-14 2.5
IC801-7 0
IC1001-15 0
IC801-8 0.3
IC1001-16 9.3
IC801-9 0
IC3401-1 4.1
IC801-10 4.9
IC3401-2 4.1
IC801-11 0
IC3401-3 4.1
IC801-12 4.8
IC3401-4 4.1
IC801-13 4.9
IC3401-5 3.6
IC801-14 4.9
IC3401-6 3.7
IC801-15 1.9
IC3401-7 GND
IC801-16 0.2
IC3401-8 4.1
IC801-17 2.1
IC3401-9 4.1
IC801-18 GND
IC3401-10 4.1
IC801-19 2.2
IC3401-11 4.1
IC801-20 2.0
IC3401-12 4.9
IC801-21 GND
IC3401-13 4.1
IC801-22 4.9
IC3401-14 1.3
IC801-23 0.2
IC3401-15 1.3
IC801-24 0.2
IC3401-16 0
IC801-25 4.8
IC3401-17 GND
IC801-26 0.3
IC3401-18 3.2
POWER ON: POWER OFF:
IC801-27 IC3401-19 9.1
4.9 0
IC3401-20 0
IC801-28 2.3
IC3401-21 4.1
IC801-29 2.6
IC3401-22 4.1
IC801-30 0
IC3401-23 3.7
IC801-31 4.9
IC3401-24 3.9
IC801-32 3.6
IC3401-25 4.1
IC801-33 4.9
IC3401-26 4.1
IC801-34 3.7
IC3401-27 4.1
IC801-35 4.8
IC3401-28 1.9
IC801-36 4.9
IC3401-29 4.1
IC801-37 4.9
IC3401-30 4.1
IC801-38
0
IC3401-31 2.0
IC801-39 0
IC3401-32 4.1
IC801-40 0
IC3401-33 4.1
IC801-41 0
IC3401-34 4.1
IC801-42 0
1 SP901
L 7
(L)
4 SPEAKER
R 6
IC002 (L)
IC3401 3
L
AUDIO
MTS DECODER 39
SP902
R AMP. 3
36 37 38 2
(R) SPEAKER
Q001
(R)
MUTE
Q005
H
+16V
AUDIO OUT (R)
IC1001
SELECT V/Y + C1/C2
AUDIO OUT (L)
S2-SW 11
K1002
H 13 V2 IN
V2/Y2 14
12 Y2 IN
L
MAIN AV 1/2 9
L
C1/C2 4
3 C2 IN
H
S1-SW 10
L
H
A/V 2 IN
VIDEO IN
AUDIO IN (L)
AUDIO IN (R)
L164
X161
Y2 IN Y
C2 IN C
ABL
S2 SW
V-S
S2 IN
H-PULSE DEFLECTION
H-S V YOKE
2
H
5 IC501
VERT.
AFC
OUTPUT
5
ABL
10 1
6/7
H.V.
T402
SIDE HORIZ. FOCUS
T401
PCC OUTPUT
SCREEN
H-DRIVE
TRANS.
TRANS.
HEATER
9
Q401 Q402 V +B
3
HORIZ. HORIZ.
DRIVE OUTPUT 4
200V
D481 D482
HOLD DOWN
DETECT.
R Q721 -R OUT
G Q711 -G OUT
Q901
PIX TUBE
B Q701 -B OUT
D483
+26V
D508
D428
D429
(16V)
ANODE LEAK
(7V)
DETECT.
R428
g7sam
NOTE: Waveforms were taken with color-bar signal and the controls adjusted for normal picture.
Device/Pin # Volts/Mode Device/Pin # Volts/Mode
IC3401-35 0 POWER ON: POWER OFF:
Q605-B
IC3401-36 4.1 13.1 1.4
IC3401-37 4.1
POWER ON: POWER OFF:
Q605-C
IC3401-38 4.1 –0.4 0.6
IC3401-39 4.1
POWER ON: POWER OFF:
Q605-E
IC3401-40 4.1 13.0 2.0
IC3401-41 4.1
POWER ON: POWER OFF:
IC3401-42 GND Q627-B
11.1 7.3
IC3401-43 4.1
POWER ON: POWER OFF:
IC3401-44 4.1 Q627-C
11.6 1.0
IC3401-45 4.2
POWER ON: POWER OFF:
IC3401-46 GND Q627-E
11.9 7.3
IC3401-47 4.1
POWER ON: POWER OFF:
IC3401-48 4.1
Q635-B
4.2 1.4
POWER ON: POWER OFF:
(Vertical Output)
Q001-B
POWER ON: POWER OFF:
0.7 0
Q635-C
31.1 9.8
POWER ON: POWER OFF:
Q001-C
POWER ON: POWER OFF:
0 6.3
Q635-E
4.2 1.4
Q001-E GND
POWER ON: POWER OFF:
Q005-B 9.6
Q681-B
0.7 0
Q005-C 10.3
POWER ON: POWER OFF:
Q005-E 10.3
Q681-C
0 7.3
Q135-B 2.3
Q681-E GND
Q135-C 5.2
Q135-E 1.7 POWER ON: POWER OFF:
Q688-B
11.6 1.0
Q202-B 2.7
Q202-C GND POWER ON: POWER OFF:
Q688-C
0 0
Q202-E 3.4
(Horizontal Output)
Q208-B 2.8
POWER ON: POWER OFF:
Q688-E
Q208-C GND 11.5 1.0
Q208-E 3.5
POWER ON: POWER OFF:
Q693-B
Q401-B 0.3 0.5 6.2
Q401-C 43.6
POWER ON: POWER OFF:
Q693-C
Q401-E GND 30.9 8.9
Q402-B -0.1
POWER ON: POWER OFF:
Q693-E
Q402-C 125.26
0.4 5.7
Q402-E GND
POWER ON: POWER OFF:
Q695-B
Q486-B 9.9
30.9 9.6
Q486-C 11.6
Q695-C GND
Q486-E 9.1
POWER ON: POWER OFF:
Q490-B 5.9 Q695-E
31.0 9.8
Q490-C 6.9
Q701-B 2.6
Q490-E 5.2
Q701-C 141.9
POWER ON: POWER OFF:
Q701-E 2.5
Q601-B
–0.3 0
Q711-B 2.6
POWER ON: POWER OFF:
Q711-C 143.1
Q601-C
155.0 169.6
Q711-E 2.5
Q601-E GND
Q721-B 2.6
POWER ON: POWER OFF: Q721-C 146.1
Q604-B
–0.4 0.6
Q721-E 2.5
POWER ON: POWER OFF: Q831-B 4.9
Q604-C
–0.3 0 Q831-C 4.9
Q604-E GND Q831-E 4.9
— 27 —

WAVEFORMS

IC101- IC101- IC101-
17 18 19
(R-Output) (G-Output) (B-Output) (Selected Video)
2.0V HORIZ
2.0V HORIZ 2.0V HORIZ 1.0V HORIZ
IC501- 2 IC501- 5 Q202-E (TP16)
(Inverting Input) (Internal Video) (Horizontal Drive)
58 VERT 0.6V VERT 1.0V HORIZ
Q402- B Q601- B T402- 9
(Power Switching) (Heater)
13V HORZ 28V HORIZ
6.0V 50KHz
— 28 —
IC101-
52
Q401- B
0.7V HORZ