Table of Contents
Advertisement
Faultfinding trees, blockdiagram, supply diagram and testpoints.
REAR I/O SCART
AM MONO DEMODULATOR
A9
A13
SCART 1
(TDA8844)
21
EXT1VIDEO
20
VIDEO OUT
A6
1701
19
A5
18
17
IF
EXT1FB
16
A6
EXT1R
15
A6
A5
14
13
12
EXT1G
11
A6
10
9
SCART PIN 8
8
A7
EXT1B
7
A6
EXT2 AUDIO L
6
AUDIO
D1
5
MONO
4
OUT L (MONO)
3
A5,D1
EXT2 AUDIO R
2
D1
AUDIO OUT R
1
D1
AUDIO FM DEMODULATOR
SCART 2
A5
21
EXT2VIDEO/Y
20
VIDEO OUT
(TDA8844)
19
A5
18
17
16
EXT2C
4,5 MHz
15
1001
A6
RF/VIDEO 2
14
5,5 MHz
13
SWITCHING
6,0 MHz
12
A7
11
10
9
SIF
8
7
EXT2 AUDIO
6
1002
AUDIO
5
A5
L (MONO)
4
OUT L (MONO)
3
A5,A10
2
AUDIO OUT R
1
D1
EXT1 AUDIO R
6,5 MHz
DUAL / MONO
AUDIO QSS MIXER
A5
SIDE AV
(ONLY FOR NICAM L SETS)
E
A6
A15
A15
(TDA8845)
EXT2
EXT1
EXT1
VIDEO/Y
AUDIO R
AUDIO L (MONO)
1204
55
TUNER / IF / VIDEO
IF
A5
56
DETECTOR
A9
(TDA8844)
IF
(TDA8845)
V
7000
LOT AUX 8V
L78M05
VLOT
1
2
+5A
7250-A
AUX+5V
TDA
3
IF
8844
ERR
11
6
7
1000
1003
1005
TUNER
48
M
11
VIDEO
49
DET
38,9
I1
RF-AGC
54
5
4
9
1
I6
I5
A7
SDA
3002
A7
SCL
33V
VBATT A1
6007
-/33V
POWER SUPPLY
P1
A1
14
5545
5500
2508
0231
5501
6502:6505
-
16
1500
AC
T 4 AL
P2
D
5573
G
13
DC
S
150-276V SINGLE RANGE
P3
15
7520
3518
5570
1
MC44603A
10
3
3525
5572
OSC
BUFFER
11
7
PRESENT 1X2W
2.5V
1
8
12
3520
2540
6540
CURRENT
2
14
2
SENSE
3528
1
4
3538
2537
6537
VBATT
3540
ADJ
HOT
GROUND
L9.2E
(FOR BG/I/LL'ONLY)
A10
EXT AUDIO
MONO
A13
7705
A5
TDA 9830
9
FM, AM EXT.
16
SOUND
8
AUDIO MONO
AM
MONO
DEM.
6
7
A1
7703
7704
FM AUDIO
A2
MONO
A5
A7 BASS
3710
A7 TREBLE
NICAM + 2CS DECODER
(ONLY FOR MONO SETS)
D1
FM AUDIO MONO A9
AUDIO OUT
A13
7254
7250-A
TDA 8844
55
1
FM
15
MONO
A5 MONO
A10
AUDIO
DET
A13,E FRONT/EXT 1/AUDIO L
A13,E FRONT/EXT1 AUDIO R
2
A13 EXT 2/AUDIO L/MONO
I3
I4
A13 EXT 2/ AUDIO R
EXT AUDIO
A7
A13
7250-A
TDA 8845
SIF
QSS
2
D1
SOUND
VIDEO PROCESSING
MIXER
A5
A6
IF
SOUND
15
AMPL.
AM DEM.
7256
CVBSTXT
A7
AGC
7250-B
TDA8844
EXT1
SIF
A5
3488
VIDEO
17
D1
A13
+8VA
13
12
+8V BIMOS
VIDEO OUT
5202
A15
V1
3216
1200
5.5MHz
7266
6
CVBS_INT
1201
6MHz
I2
3206
P4
SYNC
A4
6550
5550
+VBATT
MAIN SUPPLY 9.5V
P5
1572
6560
9502
MAIN AUX
800mA
2561
P4
1571
6570
AUDIO SUPPLY
5571
10V/14V
HFLYBK
41
T1.6A
A2
2571
PRESENT 2X2W
S1
ABL INFO
A2
HEW_PROTN
A2
6.
GB 20
SMART SOUND + MONO AMPLIFIER
FRONT CINCH +
A11
(ONLY MONO SETS)
HEADPHONE
7953 TDA 7052B (2,3,4 W)
7951:7955
-
7954 TDA 7056B (1W)
6
VIDEO IN
SMART
A13
A5
SOUND
3
8
A4
A3
VOLUME
A7
MONO
HP
ITT AUDIO AMPL.
D2
ERR
4
7833
MPS 3415D
A22
DEMODULATOR
29
LEFT OUT
NICAM
A21
2CS
SIF
58
A5
28
RIGHT OUT
FM
AM
55
52
37
OUT L
A13
53
SWITCHING
49
A13
36
OUT R
50
VOLUME A7
9
10
A14
A15
SCL
SDA
A7 A7
A13
A13,E
7250-C
TDA 8844
V2
27
V3
MATRIX
38
10
11
31
32
Y
28
Y-DELAY
INPUT
CVBS
Y/C
V4
PAL/NTSC
R-Y
BASE
U
29
23 24 25 26
SWITCH
SECAM
B-Y
BAND
V
30
R
G
DECODER
DELAY
35
34
1205
1208
A13
4.43
3.579
HORIZONTAL DEFLECTION
A2
V
5551
BATT
2551
2409
3400
5444
BU1508DX
7400
+8VA
L1
BF422
L2
H-DRIVE µC
5205
A7
7250-D
TDA8844
37
H-DRIVE
SYNC
3404
A7
G
40
HFLYBK
A4
16kHz
S2
45
E/W
S4
VERTICAL DEFLECTION
47
A3
G
VERT.
46
DRIVE
VLOT AUX +13V
50kHz
S3
50
7460
F1
TDA9302H
3461
VDRIVE-
3423
VDRIVE+
3462
F2
FRONT
CONTROL
A8
A7
CONTROL
BUZZER (N.A)
6680
LTL-307 X
VOLUME +
A10,D2
LED
LEFT
RIGHT
A7
W_DISABLE
A13
A13
A7
BASS
0234
A10
7680
GP1U 280P
DUAL/MONO
A5
IR RECIEVER
RC5
A7
STEREO
EXT 1/2
HP
A5
LOCAL
TREBLE
A10
KEYBOARD
SCART PIN8
A13
0234
0605
A13
13
RF/VIDEO 2
Vaux
7605
SWITCHING
A25
L
RESET
uPreset
11
A7
KEY BD 1
FORMER
KEY BD 2
A26
KEY BD 3
10
7611, 7620, 7621
BCL_PROTN
A27
R
PROT.
8
CIRCUIT
STANDBY
A28
HDRIVE
A4
LED
7953 TDA 7057 AQ (2X3W)
7607
A8
7954 TDA 7053 A (2X1W)
NE555D
AV MUTE
A13
7608
LINE
M28
6
DRIVE
3
SAM
START UP
M29
CIRCUIT
CVBS TXT
A6
HDRIVE µC
A2
A7
A7
CRT
ERR
ERR
+
B
5
6
V9
V10
3316
V5
V11
7
8
0243
0245
7311:
-
7313
1
RGB
RGB
R
R
21
V12
CONTROL
2
7321:
-
G
G
20
7323
3
CATHODE
V6
B
B
19
RGB
4
CALIBRA-
TION
5
V7
V13
22
6
18
BLKCURINFO
B
V8
ERR
12
6212
+160V
ABL INFO
A2
0244
A7
3
2
3416
0220
6409
+160
5445
2413
2
L3
7
1
6434
7402
FOCUS
0221
8
6404
HOR-
DEFL-
6402
5
COIL
2440
6410
11
3405
3406
6412
3
10
F4
6461
9
V_GUARD
A7
6460
6405
2464
2
6
3
F5
0 222
7
+
5
1
OP. AMP
VERT.
1
-
F5
6403
DEFL.
COIL
2
4
6406
3401
VLOT AUX
3407
-13V
7601 ST
ERR
ERR
7600
+
24W
9
10
5
M25
SAA 5565
EEPROM
M24
µC
1
52
4
SDM
7
2
51
W_DISABLE
A7
C2
3
50
SDA
ERR
A5,A6,D1
C3
7
49
4
SCL
A5,A6,D1
P1
P2
5
48
SYS1/AM
A9
6
47
7
46
VD
RC5
8
45
A8
9
44
+3V2
C4
43
RESET
10
RESET
A7
C1
P3
42
11
X - TAL
41
12
12MHz
13
40
ERR
ERR
3
8
7609
39
+3V3
14
A3
38
15
V-GUARD
16
37
7608
VD
VSYNC
A2
36
HD
17
HFLYBK
HSYNC
18
P0
35
FB_TXT_OSD
A6
VDS
19
34
R_TXT
_OSD
A6
R
20
33
G_TXT _OSD
A6
G
21
32
B_TXT _OSD
A6
B
22
31
LLP\M TRAP
A5
23
30
0267
CVBS
24
29
SDA
1
FOR
SCL
2
25
28
COMPAIR
3
26
27
+160V
3326
3336
R
V14
V15
R
G
G
CRT
B
7331:
-
B
7333
V16
FILEMENT
25kV
3349
3350
1
VLOT AUX 13V
7401
BCL_PROTN
PROT
A7
CIRCUIT
ERR
VG2
2
ABLINFO
A4
L4
VLOTAUX 13V
2410
3409
L5
VLOTAUX 5V
2414
3417
L6
A3
VLOTAUX+8V
3411
2415
FILEMENT
L7
VLOTAUX-13V
2417
6415
+
HEW_PROTN
A4
2411
CL 96532028_001.eps
3412
140499
Advertisement
Table of Contents
