Block Diagram; Voltage Charts; Waveforms; Schematic Diagrams - Sanyo DS25520 Manual

MODEL DS25520 Chassis No. 25520-04

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
29.0KV AT ZERO BEAM CURRENT AT 120 VOLTS AC LINE, AND MUST NOT EXCEED 30.9KV 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 E C B
E C
MARK 1 1 E C
1
COUNT TERMINALS IN
ARROW DIRECTION
SIDE VIEW
C E
C E E C
B E
B B C
B
B ... BASE
C ... COLLECTOR
1
1 1 E ... EMITTER
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
— 25 —
CAUTION

BLOCK DIAGRAM

4A 125V
ANT
A101
UHF/VHF TUNER IF
WITH PLL
AGC
& BAND SW
RF AGC
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
X IN
19
C808
X OUT
DIODES 20
X 801
A K
A
K
+12V
A K RL601
RELAY
A K
L901 PS601
POSISTOR
DEGAUSING
COIL
K
T601
A
CONVERTER
F601 LF601 TRANS.
AC120V AC LINE
K A
FUSE
60Hz FILTER
Q601
INFRARED EMITTING
SW.
C601
D601-D604
A....ANODE
FULL WAVE
K....CATHODE RECTIFIER
Q613
ERR.
4A 125V
AMP.
3
12 x 10 = 12K ohm

VOLTAGE CHARTS

NOTE: Voltages were measured using color-bar signal and the controls set for normal picture.
Device/Pin # Volts/Mode Device/Pin #
IC101-36
POWER ON: POWER OFF:
D612-1
25.7 9.6
IC101-37
IC101-38
POWER ON: POWER OFF:
D612-2
24.8 8.0 IC101-39
IC101-40
POWER ON: POWER OFF:
D612-3
0.7 0.4
IC101-41
IC101-42
POWER ON: POWER OFF:
D612-4
14.7 1.7 IC101-43
– 10%
IC001-1 6.7 IC101-44
IC001-2 15.4 IC101-45
IC001-3 N.C. IC101-46
IC001-4 GND IC101-47
IC001-5 N.C. IC101-48
0%
IC001-6 1.4 IC101-49
– 20%
IC001-7 1.4 IC101-50
IC001-8 GND IC101-51
IC101-1 GND IC101-52
IC101-2 GND IC101-53
IC101-3 GND IC101-54
IC101-4 GND IC101-55
IC101-5 GND IC101-56
IC101-6 5.1 IC101-57
IC101-7 2.1 IC101-58
IC101-8 2.7 IC101-59
IC101-9 3.8 IC101-60
IC101-10 3.6 IC101-61
IC101-11 4.3 IC101-62
IC101-12 1.5 IC101-63
IC101-13 1.5 IC101-64
IC101-14 1.4 IC101-65
IC101-15 0.2 IC101-66
IC101-16 8.2 IC101-67
IC101-17 2.5 IC101-68
IC101-18 2.2 IC101-69
IC101-19 2.4 IC101-70
IC101-20 GND IC101-71
IC101-21 GND IC101-72
IC101-22 GND IC101-73
IC101-23 GND IC101-74
IC101-24 GND IC101-75
IC101-25 N.C. IC101-76
IC101-26 2.1 IC101-77
IC101-27 2.6 IC101-78
IC101-28 5.3 IC101-79
IC101-29 2.7 IC101-80
IC101-30 0.4
IC101-31 GND
IC101-32 N.C.
IC101-33 1.0
IC101-34 1.8
IC101-35 N.C.
— 26 —
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.
SDL
5 IC3401
SCL
MTS DECODER
6
13
TP 16
H-S
V-S Q135 Q202
BUFFER BUFFER
IC101
SIGNAL PROCESS
SDA 9
MUTE
1 2
BUS
38
SCL 10
INTERFACE
4.5MHz
S SW
X141 78/79 75 L164
35 FM SOUND
X161
SAW
S/COMP SW DET. TRAP
FILTER
4
RF AGC 77
AV1/AV2 SW
56 VIDEO
5 VIDEO
11
DET.
ACL
Y 52
36 V-S
VIDEO
INT. VIDEO Y 54
SW. 37 H-S
IC1081
33 H-PULSE
VIDEO SWITCH Q208 V
49
BEAM
9/10 SYNC
VOLTAGE 26
SEP.
DETECT.
11 CAP
VIDEO H
ABL-IN
V2 13 H
OUT
30 V HORIZ.
14
V1 12 L DRIVER
IC801
S-Y 1 H
CPU DELAY
Y 15
WITH V1/V2 2 L LINE
CAPTION
H Q1071
S-C 3
DECODER Q401
C 4 BUFF. 30
BLACK
INT-V 5 L HORIZ.
STRETCH
DRIVE
SHARP
BPA
Y CV IN
40 HOLD DOWN
17
OSD (R)
COLOR
42 CONT
OSD (G) DEMOD BRITE
41
OSD (B) 12
17
40
OSD (BLK)
13 18
39 RGB
OSD
RESET OUT
Q831 14 19
25 SW.
RESET
AFT S-CURVE
15
29
POWER FAIL 8
3
POWER
27
ON/OFF
IC681 5V
ALWAYS
5V REG.
TJ1
+130V
D625 Q681
12V SW
DRIVE 12V
D627
D624
D623
26V +12V D801
Q486
9V
Q635
9V REG.
IC601 OVERLOAD TJ5
POWER Q627
PROTECT.
D612
REG. 12V SW.
PHOTO
26V 5V
Q490
COUPLER
5V REG.
B6
STANDBY MODE
Q693,
ALWAYS +5V
Q695
CONTROL
Volts/Mode Device/Pin # Volts/Mode Device/Pin #
5.0 IC501-1 2.5
IC801-37
4.3 IC501-2 25.9 IC801-38
4.7 IC501-3 2.9 IC801-39
GND IC501-4 GND
IC801-40
0 IC501-5 18.0
IC801-41
GND IC501-6 26.5 IC801-42
GND IC501-7 2.6 IC802-1
GND IC601-1 130.0
IC802-2
2.3 IC601-2 24.8
IC802-3
3.6 IC601-3 GND IC802-4
2.1 IC681-1 13.4 IC802-5
3.1 IC681-2 GND
IC802-6
GND IC681-3 5.0 IC802-7
2.5 IC801-1 4.0 IC802-8
GND IC801-2 4.9 IC1081-1
GND IC801-3 4.9
IC1081-2
2.6 IC801-4 0 IC1081-3
5.1 IC801-5 0 IC1081-4
2.9 IC801-6 0.3 IC1081-5
2.6 IC801-7 0
IC1081-6
2.5 IC801-8 0 IC1081-7
GND IC801-9 0 IC1081-8
3.6 IC801-10 4.9 IC1081-9
4.4 IC801-11 GND
IC1081-10
4.4 IC801-12 4.8 IC1081-11
GND IC801-13 GND IC1081-12
GND IC801-14 4.9 IC1081-13
GND IC801-15 1.9
IC1081-14
GND IC801-16 0.2 IC1081-15
2.4 IC801-17 2.1 IC1081-16
2.2 IC801-18 GND IC3401-1
2.2 IC801-19 2.2
IC3401-2
2.4 IC801-20 2.0 IC3401-3
3.2 IC801-21 GND IC3401-4
GND IC801-22 4.9 IC3401-5
GND IC801-23 GND
IC3401-6
GND IC801-24 GND IC3401-7
2.3 IC801-25 4.9 IC3401-8
GND IC801-26 0.3 IC3401-9
2.2
POWER ON: POWER OFF: IC3401-10
IC801-27
4.9 0
2.6 IC3401-11
2.2 IC801-28 2.4 IC3401-12
2.9 IC801-29 2.8
IC3401-13
2.9 IC801-30 0
IC3401-14
GND IC801-31 4.9 IC3401-15
IC801-32 3.6 IC3401-16
IC801-33 4.9
IC3401-17
IC801-34 3.7
IC3401-18
IC801-35 4.8 IC3401-19
IC801-36 4.9 IC3401-20
IC3401-21
Note: Voltages were measured with offset color-bar signal and controls set for normal picture.
TV OUT-L
39
TV OUT-R
38
LS OUT-L
4
3 LS OUT-R
33 34 36 37
Y
C
S-SW
K1051
S-VIDEO IN
(AV 2)
VIDEO IN-2
AUDIO IN-2 (L)
K1001
REAR
(Vertical Output)
AV IN
AUDIO IN-2 (R) (AV2)
AND
FIXED
FIXED
AUDIO
AUDIO OUT (L) OUT
FIXED
Q001
AUDIO OUT (R)
POWER OFF
Q005
NOISE AUDIO +B
CANCEL SWITCH
VIDEO IN-1
AUDIO +B
ABL K1011
FRONT
AUDIO IN-1 (L)
AV IN
(AV 1)
AUDIO IN-1 (R)
V
DEFLECTION
YOKE
(Horizontal Output)
L902
H
5 L 7
1 SP901
LEFT
1 IC501
IC001 SPEAKER
VERT. 2
OUTPUT AUDIO
5
AMP. SP902
ABL R 6 3
1 RIGHT
6/7
H.V. SPEAKER
T402
HORIZ. FOCUS
T401
OUTPUT
H-DRIVE SCREEN
TRANS.
TRANS.
HEATER
9
Q402
HORIZ.
LOW +B
OUTPUT 8
4
D482
HOLD DOWN
DETECT.
R Q721 -R OUT
Q711 -G OUT
G
Q901
PIX TUBE
B Q701 -B OUT
D481
+200V
D471
AUDIO +B
15V
D802
D428
D429
(13V)
ANODE LEAK
(7V)
DETECT.
R428
g7lca
Volts/Mode Device/Pin # Volts/Mode Device/Pin # Volts/Mode
4.9 IC3401-22 4.1 Q486-B 9.9
4.8 IC3401-23 3.7 Q486-C 11.6
0.2 IC3401-24 3.9 Q486-E 9.2
IC3401-25 4.1 Q490-B 5.9
0
0 IC3401-26 4.1 Q490-C 6.7
0 IC3401-27 4.1 Q490-E 5.2
GND IC3401-28 1.9
POWER ON: POWER OFF:
Q601-G
5.8
GND IC3401-29 4.1
GND IC3401-30 4.1
POWER ON: POWER OFF:
Q601-D
GND IC3401-31 2.0 157
4.9 IC3401-32 4.1
POWER ON: POWER OFF:
Q601-S
15
4.9 IC3401-33 4.1
GND IC3401-34 4.1
POWER ON: POWER OFF:
Q613-B
5.0 IC3401-35 0 0.2
2.5 IC3401-36 4.1
POWER ON: POWER OFF:
Q613-C
4.7
2.9 IC3401-37 4.1
2.5 IC3401-38 4.1 Q613-E GND
2,4 IC3401-39 4.1
POWER ON: POWER OFF:
Q627-B
2.4 IC3401-40 4.1 12.7
GND IC3401-41 4.1
POWER ON: POWER OFF:
Q627-C
13.2
GND IC3401-42 GND
GND IC3401-43 4.1
POWER ON: POWER OFF:
Q627-E
0 IC3401-44 4.1 13.3
0 IC3401-45 4.2
POWER ON: POWER OFF:
Q635-B
3.4
0 IC3401-46 GND
2.9 IC3401-47 4.1
POWER ON: POWER OFF:
Q635-C
2.5 IC3401-48 4.1 25.0
2.9
POWER ON: POWER OFF: POWER ON: POWER OFF:
Q001-B Q635-E
0.7 0
2.9 3.4
9.3
POWER ON: POWER OFF: POWER ON: POWER OFF:
Q001-C Q681-B
4.1 0 17.0 0.7
Q001-E GND
4.1
POWER ON: POWER OFF:
Q005-B 15.4 Q681-C
4.1 0
Q005-C 16.0
4.1 Q681-E GND
Q005-E 16.1
3.6
POWER ON: POWER OFF:
Q135-B 2.2 Q693-B
0.5
3.7
Q135-C 5.0
GND
POWER ON: POWER OFF:
Q135-E 1.5 Q693-C
4.1 24.7
Q202-B 1.7
4.1
POWER ON: POWER OFF:
Q202-C GND Q693-E
0.6
4.1
Q202-E 2.3
4.1
POWER ON: POWER OFF:
Q208-B 2.5 Q695-B
4.9 24.7
Q208-C GND
Q695-C GND
4.1
Q208-E 3.1
1.3
POWER ON: POWER OFF:
Q401-B 0.3
Q695-E
1.3 24.8
Q401-C 17.7
0 Q701-B 2.4
Q401-E GND
GND Q701-C 154.9
Q402-B 3.2
3.2 Q701-E 2.2
Q402-C N/A
9.1
Q402-E 3.2
0
4.1
— 27 —

WAVEFORMS

IC101- 17 IC101- 18 IC101- 19
(R-Output) (G-Output) (B-Output) (Video Input)
3.4V HORIZ 3.4V HORIZ 3.4V HORIZ
IC501- 5 IC501- 1 Q202-E (TP16)
(Horizontal Drive)
(Inverting Input) (Internal Video)
48 VERT 0.6V VERT 1.0V HORIZ
Q402- B T402- 9
Q601- G
(Power Switching) (Heater)
21V HORZ 15V 50KHz 28V HORIZ
Device/Pin # Volts/Mode
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
0.4 Q831-C 4.9
Q831-E 4.9
164 Q1071-B 3.0
Q1071-C GND
0 Q1071-E 3.7
0.1
0.1
8.0
0
8.0
1.3
8.2
1.1
0
6.0
5.2
7.1
4.7
7.4
8.0
— 28 —
IC101- 52
1.0V HORIZ
Q401- B
.7V HORZ