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Electrical diagrams and print layouts
Teletext
1
2
3
4
TELETEXT
A
+5V
B
3148
7049
27E
+13V
78L05
5V
7050
16
74HCT4046
VCC PC1out
3
COMPin
1V8
PC3out
C
0
5454
+5V2
+5VA
PC2out
5.6uH
14
HDISP
SIGin
0V8
PCPout
6
0V
C1A
7
0V
C1B
5455
+5VD
VCOout
D
11
5.6uH
R1
0V
VCO
12
0V
R2
DEMout
0V
9
VCOin
5
INH
+5VDDR
GND
5451
5V
5.6uH
0V
8
E
+5V
5452
+5VDRAM
5.6uH
F
VIDEO INPUT PROCESSOR
7250
SAA5231
19
18
G
28
TCS
22
SC IN PULSE
25
VCS
2163
14
TTC
H
10nF
2164
15
TTD
10nF
13
11
I
J
+5VDRAM
K
1
2
3
4
FTV1.9EE
5
6
7
3465
+5V
100E
2470
6002
3461
180p
1K
1N4148
3V2
7055
2463
BF550
5460
10uH
4
1n
PLL
3
MT
1
2
6
+5V
1V
2
15
0V
13
1V2
7056
1
BC848
5V
3V2
2446
7057
100p
BC848
3154
0V7
10K
4
Y/CVBS-MAIN
0V
0V
10
0V
3149
470K
+13V
+5VDDR
17
10
2
1
7
16
12
27
COMP VIDEO IN
20
OSCIL IN
21
FILTER1
+5VD
23
RES
24
CAP
4451
+5VD
26
9
8
6
5
4
3
+5VD
4
23
3
25
24
2
1
5
18
17
16
15
14
12
11
RAS
CAS
WE
D3
D2
D1
D0
A9
A8
A7
A6
A5
A4
A3
A2
13
VCC
OE
VSS
22
26
HYB514256B-70
5
6
7
7.
44
8
9
10
11
3V9
2467
1V7
100p
VD
2451
100nF
7051
2V1
0V
0V
0V
0V3
SAA5270
15
34
33
21
22
3451
18
BLACK
27K
IREF
INPUT
2V5
CLAMP
2461
16
& SYNC
27MHz
CVBS
SEPAR
2V3
DISPLAY CLOCK PLL
100nF
CVBS
13
+5VA
TIMING CHAIN
VDDB
5V
2468
12
REF+
3V5
100nF
ADC
2469
11
REF-
MOSAIC MEMORY
1V5
100nF
CHARACTER ROM
8
VSSB
DRCS
0V
20
0V
25
DCVBS
5V
26
0V
DATA
27
ROW
SLICER
5V
43
AND
BUFFER
0V
REGENERATOR
44
5V
47
0V
49
5V
51
0V
TELETEXT
55
3V4
TTC
ACQUISITION
58
0V
60
5V
61
0V
BACKGROUND
+5VD
TEST1
4
MEMORY
0V
CONTROLLER
TEST2
2
0V
1
SEL1
5V
DRAM INTERFACE
68
SEL0
0V
A0
A1
A2 A3
A4
A5 A6 A7 A8 A9
D0
D1 D2 D3
57
56
50
48
46
45
42
41
40
59
67
10
9
9
10 11 12 14 15 16 17 18 5
1
A1
A0
A0 A1 A2 A3 A4 A5 A6 A7 A8 A9 D0 D1
7491
7490
HYB514256B-70
8
9
10
11
12
13
14
15
+5VA
+5VD
5V 5V
14
17
23
52 53 54
0V
7
3V5
6
3V8
5
CRYSTAL
OSCILLATOR
TXT-DECODER
3
1V8
3497
31
CURSOR
FBL-TXT
BLAN
180E
AND
0V
ATTRIBUTE LOGIC
SHODOWING
32
COR
0V
+5VD
9
5V
10
0V
CLUT
19
24
0V
PACKET 26
R
PROCESSING
28
0V
G
DAC
29
0V
B
LEVEL 1
30
PAGE
+5VDDR
VDDR
5V
CONVERSION
+5VD
I C 2
3484
4V8
INT
100E
35
SCL
SDA
66
65
64
63
38 39
62
4V7
36
37
4V9
4V3
4V8
4V7
SCL-F
SDA-F
2
24 25
3
23
4
MEMORY
D2 D3 WE
CAS
RAS
13
+5VDRAM
VCC
VSS
OE
26
22
12
13
14
15
16
17
18
1162
I 4
2150
F 7
2151
F 7
2152
F 7
2155
I 6
2156
I 6
A
2157
I 6
2158
I 5
2159
I 5
2160
I 5
2161
I 4
2162
I 4
2163
H 3
2164
H 3
2430
K13
2431
K 4
2433
J16
2434
J16
B
2435
H16
2436
H16
2437
H16
2438
H16
2439
I16
2440
I16
2441
I16
2442
I16
2443
J16
2444
J16
2445
J16
C
2446
D 5
2447
C 5
2448
B 2
2449
B 3
2451
C 9
2452
C12
2453
C12
2454
C 2
2455
D 2
2459
F 2
D
2460
G 8
2461
D 9
2462
A 5
2463
A 7
2464
G 8
2465
E 8
2466
A 8
2467
B 9
3491
R-TXT
2468
E 9
100E
2469
E 9
2470
A 7
E
2471
B 5
2472
G 8
3148
B 1
3149
E 5
3150
E 7
3151
D 5
C 5
3152
3153
B 6
3154
D 5
3155
C 6
3156
C 6
3493
F
G-TXT
3451
D 9
100E
3454
C11
3455
I12
3456
I13
3457
I13
3461
A 7
3462
B 7
3463
A 8
3464
B 8
3465
A 5
G
3481
I14
3482
I14
3495
3483
H15
B-TXT
100E
3484
I15
AQ56
3488
H15
3489
H16
R-TXT
3490
H16
2435
3491
E17
1
3493
F17
G-TXT
22pF
3495
G17
2436
2
3497
E15
B-TXT
22pF
H
4451
H 8
2437
3
4452
I 8
22pF
GND-TXT
4453
I 8
4
4454
I 9
FBL-TXT
4455
G 8
2438
5
4456
H 3
IRQ-TXT
47pF
5152
F 6
2439
6
5451
E 1
HDISP
47pF
5452
F 1
2440
7
5454
C 1
VD
22pF
5455
D 1
I
2441
5460
A 6
8
6001
B 5
22pF
GND-YC-MAIN
6002
A 6
9
7049
B 2
Y/CVBS-MAIN
2442
7050
B 4
10
7051
C 9
+5V2
22pF
7055
A 8
2443
11
7056
C 6
+13V
100nF
7057
D 6
2444
12
7250
F 3
SDA-F
100nF
J
7490
K 9
2445
13
7491
K 8
SCL-F
22pF
AQ56
G18
2433
14
IRQ-TXT
22pF
2434
15
47pF
CHASSIS-GFL
K
AQ.eps
281097
16
17
18
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