SERVICE MANUAL

CHASSIS CTR-AA
CONTENTS Page

1.- Technical specifications 3

2.- Connection facilities 3
3.- Mechanical instructions 4
4.- Oscillograms 5
5.- Print board layout 6
6.- Electric scheme 7 - 12
7.- Circuit description 13
7.1.- Small signal processing, Microcontroller/Teletext 13
7.2.- RGB amplifiers 17
7.3.- Deflection 17
7.4.- Sound amplifier 17
7.5.- Power supply 18
7.6.- Protections 19
7.7.- Sets with SECAM L/L systems 19
7.8.- Stereo sets 20
8.- Electrical adjustments 22
8.1.- Service mode 22
8.2.- Power supply and focusing 22
8.3.- AGC adjustment 22
8.4.- White D 23
8.5.- Geometry 23
8.6.- Options 23
8.7.- Entering and exiting Plug & Play 25
8.8.- Error messages 25
9.- Safety instructions 26
10.- Service components 27

2
1. Technical specifications
CHASSIS CTR - AA

Mains voltage : 220 - 240 V ± 10% AC; 50 Hz (±5%)

Power cons. at 220V~ : 35 W (14’’), 50W (20’’/21’’), 55 W (21" Real Flat), 3W (Stand-By)
Aerial input inpedance : 75 W - coax
Min. aerial input VHF : 30µV
Min. aerial input UHF : 40µV
Max. aerial input VHF/UHF : 180mV
Pull-in range colour sync. : ± 300Hz
Pull-in range horizontal sync. : ± 600 Hz
Pull-in range vertical sync. : ± 5 Hz
Picture tube range : 14'' / 21‘’ / 21" RF / 21" PRF

: Mono: 25W 1W (14’’), 16W 2W (20’’/21’’)

: Estereo : 2x16W 2x4W (21’’), 2x5 W (21" Real Flat)

TV Systems : PAL BG
: PAL I
: PAL / SECAM BG / DK
: PAL / SECAM BG / L / L'
Indications : On screen display (OSD) green and menu
: 1 LED (red in On and blinking red in stand-by

VCR programs : 99, 0/ (new mask software)

Tuning and operating system : VST

UV1315A / IEC (VST) : VHFa: 48 - 168 MHz

: VHFb: 175 - 447 MHz
: UHF: 455 - 855 MHz

U1343A / IEC (VST) : UHF: 455 - 855 MHz

Local operating functions : Vol/Prog, +, -, contrast, colour, brightness and sharpness (and hue on program AV with NTSC
signal).

2. Connection facilities
Euroconnector 1 Euroconnector 2
1 - Audio R 1 - Audio R (0V5 RMS@ 1K )
Ext 1 2 - Audio R
Ext 2 2 - Audio R (0V5 RMS@ 1K )
3 - Audio L 3 - Audio L ( 0V5 RMS @ 1K ).
4 - Audio 4 - Audio
5 - Blue 5 - -
6 - Audio L 6 - Audio L (0V2 - 2V RMS @ 10K ).
7 - Azul 7 - - (0V7pp @ 75W ).
8 - CVBS status 1 8 - CVBS status 2 (0-2V int., 10-12V ext.).
9 - Green 9 - -
10 - - 10 - -
11 - Green 11 - - (0-2V int., 10-12V ext.).
12 - - 12 - -
13 - Red 13 - Chroma
14 - - 14 - -
15 - Red 15 - Chroma (0V7pp @75W ).
16 - RGB status 16 - - (0-V4 int.) (1-3V ext.@ 75W ).
17 - CVBS 17 - CVBS
18 - CVBS 18 - CVBS
19 - CVBS 19 - CVBS ( 1Vpp @ 75W )
20 - CVBS 20 - CVBS /Y ( 1Vpp @ 75W )
21 - Earthscreen . 21 - Earthscreen .

Head phone:
8 to 600W. Mono : 25mW @ 32W
3,5mm ø. Stereo : 2x6mW @ 32W

3
3. Mechanical instructions
For the main carrier two service positions are possible (3.1).

A: For faulfinding on the component side of the main carrier.

B: For (de) soldering activities on the copper side of the main carrier.

Position A can be reached by first removing the mains cord from it’s fixation, then loosen the carrier lips (1) and then pulling the
carrier panel (2) for approximately 10 cm.

Position B can be reached from position A after disconnecting the degaussing cable.Put the carrier on the line transformer side.

Fig. 3.1

Fig. 3.2

4
4. Oscillograms

5
 +3V3A
7015 +3V3
E39 B38 B37 E36 D3 C35 2628

*
- TV PROCESSOR - A1
3682 3684 3685 100N 7685

*
9866
9865
9674
9682
BG/L

L/L'
SDA_2
22K 2K2

SCL_2
1 64 2K2 24C04
- MICROCONTROLER - SWB P1.3/T1 P1.2/NT0
- TXT - STBY
3601 3602 9763 2 63
+55 1K5 1K5
P1.6/SCL P1.1/T0
9608 2608

*
2602

10U
3680 6602 9609
TP33 3 62 3628 B34
3603 * P1.7/SDA P1.0/INT1 RC5
2609 100R
A2 24K

*
7605 * 3607* +3V3A +3V3A
A1 3612 3611 3610 * PMBT2369
V_VARI 3606 * TP34 4 61 9656 +3V3
22K 5607
10K 15K 3604 * P2.0/TPMW VDDP
150 2622 10U
2611 2610 10K 3618 2623
3605
*

220N 220N 220K +3V3A 100N 100U

1K5 5 60 3621
KEYBOARD P3.1/ADC1 RESET
B2 9618 RES +8C +8C
3656 3629
STBY +3V3A 1K
D3 9140 TP17 22K 6 59 33P +8
MUTE P3.1/ADC1 XTAL_OUT
C4 2603 * +8A
1679 5033
12MHz 2032
10U
100U
9665 7 58 33P
INT/EXT1 P3.2/ADC2 XTAL_IN
C5 2604 *
A3 A4 +3V3
9613
+3V3
8 57
VHFIII P3.3/ADC3 OSCGND 9536
A6 9664 +3V3 +3V3
9670 9016
+8 +8 9 56 5602 +3V3
9671 VSSC/P VDDC
INTEX2 10U
2613 2600
C7
100N RES
3671 9672 10 55
9290
LED P0.5 VPE
B8 GND GND
2612 2601

*
100N 100U
A9 9669 11 54 M7:4 B33
VHFI P0.6 VDDA GND_RGB
5601
A6 TP28 10U
VHFIII
7601* 3613 3614 12 53 3295 M7:1 B32
*

A10 BC847 VSSA BO B_OUT

UHF 47K 47K
100R
TP29
3615
RES 13 52 3294 M7:2 B31
A5 9305 2301
SECPLL GO
100R
G_OUT
TP30
*

EHT 5301 220N

D11 7401 +8 10U 14 51 3293 M7:3 B30
TP16 3410 * 9 VP2 RO R_OUT
FBACK 100R 2290 * 470P
2303 2302
*

2K7 3292 * M7:5 B29

9371 8 100U 22N CUT_OFF
VGUARD GUARD 15 50 1K 6496 *
A12 A12
9496 7 DECDIG CUT_OFF VGUARD
LL4148 3496
OUT_A 2304 2299 3495
*

*
1K

*
220N RES 10K
M10:1 +55 6
VFB 3305 16 49 D28
2416
2403
47N

9417 PH2LF BCL/VGUARD BCL

100N 5
GND 10M 2305
*

TP15 2298

*
3415 9414 4 2N2
100N
3402 OUT_B 3301 17 48 2293 * C27
390R +15 9416 3 PH1LF B2/UIN B_EXT
15K 100N
3414
RES

Vcc 2306 2307

2418 2417
3416 RES 100N 2 1U 4N7
Vi_B 18 47 2292 * C26
M10:2 GND3 G2/YIN G_EXT
1
Vi_A 100N
TP11
3406 19 46 2291 * C25
9434
- FRAME - 100R DECBG R2/VIN
100N
R_EXT
3411 2411 2308
*

2K 2N2 22N
3413 6413 * 1% 9435 3407 20 45 3291 *
2309 C24
AVL/EWD INSSW2 FB_EXT
3412 2U2 100R
2412 100R
*

TP32
*

2K 2N2
1% 9401 21 44
AM_IF C23
VDRB AUDOUT/AMOUT AUDIO_OUT
B13 9061
+5A +5 2367
*

2001 2003 1N
*

RES 9402 22 43
100U C22
VDRA NC CHROMA
TP21
JMP 2366
*

5012 1015 1N 23 42 2010

C21
IFIN1 CVBS/Y CVBS_EXT
RES 1 4 3014 * 100N
+8 3030
2002 *

5010 47R +8C

-TUNER -
RES

1U2 24 41
2 5 3015 * 1R
IFIN2 GND1 C20
47R 2036 3035 INT_CVBS
3 100U 100R
3341 25 40 2034 3034 *
2005 470N

IREF CVBSINT
39K 1% 100R
+8F +8 2007
47N
- IF - +8A
47N
3002
9010

26 39 3031 E19
9011

2K +5A 2340 +8C SIF

UHF VSC VP1 180R 9004
A10 3003 6020 100N 2031
*

+8F
3017
2K2

100R 100N 7004 *

3005
RES

6090 3029 *+5A BC857 3032 1032 7005

3004 27 38
5V1 3020 180R 1K BC857
2K 3K3 TUNERAGC IFVO/SVO 330R
3026* 2006 3019 3022 *
VHFIII 2017 2018 TP22 3033 *
22N 3018
A6 3037* 10N
+8F * 27K 5032
2091 28 37 2021 * 1K
3000

3K3 3023 +8C

*

8U2
3006 RES AUDEEM/SIFIN1 PLLIF
2K 390R 100N
2102 - VIDEO -
*

3007* 1033
VHFI 3027
A9 29 36 100K 3028 D11
2092 3008 DECSDEM/SIFIN2 EHT EHT
*

RES 5K6 9118 3025

A6 A7 2103 2106 2023
*
*

+8 +8 47N 22K
30 35 2105
V_VARI C18
GND2 AUDEXT/QSSO/AMOUT SC_AUDIO_IN
A1
TP10
3103
2101 9103 1K2 +8
SC_AUDIO_OUT 31 34 3371 9497
D17
C14 10U SNDPLL/SIFAGC FBISO H_FLYBACK
9102
9091 7104 * 3372
3101 6372
A8
*

BC847
9092 2111 3K9 8V2
32 33 9403 9404
AM_MONO

GND GND 3104 * +8 D16

9013 330P NC HOUT LINE_DRV
9093
3K3 2104 3373
9094 3102 9014 1N2
*

TP9 +3V3
820R 470R
9095 B15
 +200
- RGB & DISPLAY COMPONENTS -
2202
A-D 100N
7200 6 - DISPLAY -
33 L6
A32 3207 3 3203 1M1
B_OUT
L2:1 560R 7 1K5

RG
A31 3214 1 3216 23
G_OUT GR
L2:2 9 1K5
3220
VG1

VG2
FF*
FF
FOCUS
3221 *

A30 3217 2 3229

9226
R_OUT
L2:3 8 1K5
AQUA

3226
3236

1K5
5 1K5

AQUA
2204
470P
A33 TDA6107JF/N3 4 2237
RGB_GND 2N2 TP20
L2:4
+200

5235
3206 2208

3205

51R
A29

1M1
CUT_OFF

L1:1

L3
L1:3

L1:4
L2:5
6230

FOCUS
25KV
VG2
+200
FF

FF

D42

D43

D44
D39

D40

D41
B1 - AM SOUND -
+8B
3118
*

6K8
TP36
2107 * K9650M
10N 1101
1 4
AM_IF
A13
6101 7125
*

3117
*

BA682 RES TDA9830

2K2
+3V3 3114 *
2 5 1 16
IF_IN IF_IN
+8B 2K2
3626 3 +8B
3K3 2 15
7103 * NC NC
3122 * 3119
L/L' 1R +8
A37 9122 22K 3 14
BC847 2109 CAGC +8V
3116 2124 +3V3
*

4U7 2125
10K 4U7
*

4 13 100N
CREF GND
2108 3627
4U7 3K3
9123 A38
5 12
NC MUTE BG/L

6 11
AM_OUT +12V
2126 B2 - AM MONO -
*

220N
7 10
AM_IN SW +8
E45 3125 8 9
AM_AUDIO_OUT AF_OUT EXT_IN 7106 * B45
B45 AM_AUDIO_OUT
BC847
2U2
A15
AM_MONO
3126 2112
1K

3127
7102 *
47K BC847

26
A2
9686
B3 14" B4 20"/21" +3V3 +3V3
MENU KEYBOARD
3665
*

9684 25 680R
GND GND P-
3667
*

24 1K3
RC5
A34 1636 9685 1685 P+
3635 3661
1K 9619
1K 1 1
2 2
3636* 3664
3 3
+3V3 100R
2636
+3V3 100R
2685
9169 B5 -MONO-
TSOP1836SS3V TSOP1836SS3V HEADPH_GND
100U 100U
E49
+3V3 +3V3 3191
68R
6663 42
6636 1 2194
B4_4534 B4_4534 100U
9687 2192 2196
3 10N 9168 C48
HPH_MONO
3662 B6 11 3197*
9166
*

3666
270R 3199 3198 HPH_L
*
*

10 E47
3675
*

*3196 9167
A8 3670 1K3 2
7607 * HPH_R/SPKSW
LED E46
0R05 BC847
3669 C46
*

1K
 A-E-F +8
3837
+8 - SCART + AV -
3877
3836 2837 120R 2825 7875
120R
470R 100N 6849 * BC847
SC1_CVBS_IN +8 3874
3835 * C52 2876
2867 LL4148
100R 18P 100N
SC2_CVBS 9891
3872

*
3892 * 3814
C55 7878 SC2_CVBS_IN 100R 100R
BC847 100R C54
3838 3839* CVBS_EXT
3870 A20

*
A21
1K5 68R 75R 3875 INT_CVBS
3865

*
3840 2839 9296 75R

*
1K RES 68R
C53 3876
AV_CVBS_IN 2866

*
18P 470R

3846 *
CHROMA FB_EXT
A22 100R A24 3845
3871 3858
*

*
R_EXT
75R 75R A25

3855 *
100R

75R
+8
C2
3886

*
10K 7876

*
BC847
6851 * 3843
C1 INTEX2 G_EXT
A7 100R A26

3853 *
LL4148 3880
- SECOND SCART-

75R
5K6
3885 3883

24k2% RES 3898 3879

A5

*
INT/EXT1
3863 * 3896 * 3841
SC2_AUDIO_IN_L 10K B_EXT
8K2 E58 100R

3851 *
3852 * A27
2853

75R
RES

SC1_AUDIO_IN_L
2864 3867
*

330P 10K E59

2852
3854 *
2856

*
3861 *
*

2851

SC2_AUDIO_OUT_L RES 3810 3860

*
*
E50 2863 150R 3868 * * 150R 9809
3890
*
*

2850
220K 330P SC2_AUDIO_IN_R
8K2 E57 3850 *
3866 *

220K
3873
3808 *
2860
10K

SC2_AUDIO_OUT_R SC1_AUDIO_IN_R
3869

*
2865
E51 150R 330P
3889

3856 *
E60
*

2855
*

220K 330P 2859

*
9802 C3
3864

*
3823 GND GND
+8 +8 A18 150R *

2854 *
SC_AUDIO_IN

330P

220K
3888
2801 10K
7831 9291
*

3825 100N 16 9 BC847 SWA GND GND

47K E56
2832
*

C52 Vdd 100N

3
SC1_CVBS_IN
3826 4
C8
22K SC2_CVBS 2833 * 3830 3803 3801

*
*

C55
A20 5 100R 3804 8K2 * 8K2
10K
100N

3802
3834 *

10K
INT_CVBS
75R

2804 2802
2834

SC1_AUDIO_OUT_R
* 330P

SC1_AUDIO_OUT_L
*

330P
18P
C53 13 3805
AV_CVBS_IN
+8 A21

SC_AUDIO_OUT
14
6865 CVBS_EXT
*

LL4148
C54 1 10K
SC2_CVBS_IN 3832 +8
3714

2828* 11
AUDIO GND GND
100N 3831 3829
C9 VIDEO
3830 3803
*

RES GND GND

C52 2 7830 100R * 8K2 AV_AUDIO_IN_R
2834*

SC1_CVBS_IN 10K
10K
3804
2714

3834 *

BC847 2804
75R
18P

AV_AUDIO_IN_L

6 330P
/E 3822 GND GND
+8
AV_CVBS_IN

7 10
Vee
8 10K
Vss 3820 A35
7822 GND GND
15 12 SWB
BC847 22K
3821 GND GND
10K
C53 E62 E63 E64 E65 A14

9145
- AMPLIFIER - TP35
66 48 C6 9191 7187C
- 9143 GND GND
+
+

HPH_R/SPKSW OUT-_MONO
E46 C72 7187B
B46 3194 TDA8943SF
54 OUT2+
3193 RES
NC
HPH_MONO OUT+_MONO + 2154 17 9
B47 7187 C71 100N +13B VCC2
TDA8941P
9170 2190 16
*

+13B 1 8 +13B 220N GND2

+13B +13B VCC GND 3154 GND
3175 82R 15 8
9181 2188 RES -
*

OUT2-
+13B +13B 14
2 7 RES
NC
OUT+ OUT- MODE
13 7
+8 +8
INA+ IN2+
C66 12
C66 3 6 3170
*

SVR
INA+ IN+ SVR SVR
11 6
2182 C70 MODE
MODE
+13B 10U 10
4 5 C69 C69 IN2-
MODE IN- IN- IN- IN-
3171 9 5
2193 *
C7 2147 6147 *
10K IN1-
10U LL4148 MODE 220N 2183 8
7140 * C70 C68 INB+ 1N5 NC
IN+
+5B BC847 3145 3190 7 4
3140 3186 2184*
*

3147 C73
*

3142 IN1+
*

22K 10K MAIN_L

*

100K
10K 220N 6
3185 NC
OUT+
*

3141* 3189 RES 5 3

MUTE 7141 * +13A +13B 55
A4 22K OUT1+
BC847 +
1R 2155 +13B 4
2187 2189 VCC1
100N VCC
9144
3 2
OUT+_MONO
A23 9113 3184 *
C4 2181* C71 3155
82R
GND1
9151 2
AUDIO_OUT INA+ - OUT1-
2198 C66 OUT-_MONO OUT-
220N
1N5 C72 1 1
3183
*

MAIN_R IN-
E67 2179 C69
C5 2185
2195
1N5
220N
INB+
220N C68
2191 *
9196
GND_AUDIO GND_AUDIO
 A,B
- LINE - 3457 2458
5445
10N
+VCC_LINE 25KV B43
5447 1
11
3455 47U
2449
2448 VG2 B42
10N
2
3456
H_FLYBACK FOCUS B44
A17 9480
+13C +8D
2451 5480 M10:3 M10:6
3460 A11
10U 3480 EHT
8
6446 2450 3462 6463
3451 9464 A28
1N4148 6451 BCL
33K BYT42M TP14
+55 3447 3446 3448 12K LL4148
2460
TP12 TP13 47N 2462
150R
7445 4U7
3444 2445 6447 2446
+VCC_LINE RES 2444 2 3 3445

*
47N 47R
5441
30882 3452 6452
3470
1 4 4R7 6470 +55
6 BYT42M
7 2453
7440 2442 2470 BYT42M 22U
3440 2440 5440 560P +8E
LINE_DRV 10U
3
A16 100R 1U 22U
6440 3441 BF422 3442 +8D
*

LL4148 10K 5K6 3235 3450 6450

9 4 9479 +8

1R 1/2W BYT42M 2467

5 2454 7478 470U
10 470U RES
3238
5449 TP40
+15
10U
6449
+15
M6:1

M6:4

M6:3

3449
1R 2455
470U
TP39

+3V3 +3V3 +8 +5
7479
BC337

3477

*
100R
3475
+200

470R 6479
FF

FF

*
C5V6 2%
B41 B40 B39

+8E 3557 100K

3555 9550
9510 7550 3550
1 4
3558 6558 100R
*

7555
7556 *
BC847 2 6
3556
49:1
2556
D1 DEGAUSS
3501 2506
RES 9598 9502 9508 49:2
3N3
50:1 PTC
9509
2 2 2534
1N4007

9504 +VCC_LINE_A
1N4007 1N4007

3504 TP1 5525

6504
2504

6505
2N2

10M 4 5500 3 RES

6530 3530
2500 5534 +VCC_LINE
22 470N FERRITE BYW36 2530
7
1N4007
2502

6502
2N2

6503

2 1 47U 3572
2505 8 TP6
3527
1 1 270K 0.5W 3541
9575
T 2.5 A H
KA5Q0565RT 7514 +13 +3V3
1500 9599 10 7575
50:2
100N

9 BC337 2561
2562

RES 3571
DRAIN
SYNC

3528 470R 22U TP7

GND
VCC

TP5
FB

5533 270K 0.5W

FERRITE
5 4 3 2 1 3570 3573 6571
*

12 47R 0R05 RES

2510
1N 6570 * POR
6525 6523 3V3 2% 7571* RES
BAV21 BAV21 BC847
3576
130R
TP8
2514 3525
47U TP2 2515
1 2532 470P +13C
47U 4
TP3 10R 6541 1540 5538
5 +13A
6511 3522
5532
+13 FERRITE 6540 +13
1K2 2
1N4148 6524 3 2540
3526 2524
470R 1N4148 3539 9542
3N3
TP4 3535 +VCC_LINE_A
9506 1K 2533 +13
- POWER SUPPLY - 6521 3542 2531 3531
*

RES 3511 7515 1K RES 3533

2527
*
*

TCET1103G 22K
2528 47N
*

RES 3540 3534

RES 47K
2539 7572 *
22N 3536
*

39K 6531 9572 BC847 3537

7533 22K A3
KA431LZ 3519 1N4148 STBY
9507 9667
TP18 TP19 3532
*

RES
 7701

- STEREO - 1 64 +5B
5757
PCLK Vddd2
FERRITE
2777
470N
2 63
NICAM LOR
A-C
3 62
ADDR1 LOL
3748 TP25
+5B
3K3
9728 3750 4 61
A36
SCL_2 SCL MOL MAIN_L
100R 2775 C73
3749 * TP26
+5B 10N
3K3 TP27 5 60
A39 9727 3751
SDA_2 SDA MOR MAIN_R
100R 2773 C67
10N
TP31 6 59 +5C +13B
3770
Vssa1 Vdda +8E
2772 2R2
470N 3771

*
3K3 7781
7 58 2771 * 0R05
Vdec1 AUXOL 3780 * 2799
2750 2770 4U7 HPH_L
10N 3772 BC547
470N 100U B47
33K 3775
8 57

*
+5B 3752 2769 * 330R 1/4W
Iref AUXOR +13B
E1 - MULTI - 3742
10K 2768 4U7
+8E
10N
RES 3769
9722 9721 9 56 3K3
L/L' P1 Vssa3 0R05
A33 3781 * 2798
2787 HPH_R/SPKSW
RES 3774 7780

*
33K 100U B46
10 55 BC547 3773

*
SIF2 PCAPL 330R 1/4W
2767
10N
9712 11 54
GND GND
Vref1 PCAPR HEADPH_GND
2766 9780 B49
2751 10N
*

100N
2740 * 2742 * 12 53 9781
A19
SIF SIF1 Vref3
27P 120P 2765 RES
5741 47U E3 - 2ND SCART-
22U TP24 13 52
3741 2778 C50
*

6K8 ADDR2 SCOL2 SC2_AUDIO_OUT_L

2776 2U2
2741 470P
*

180P 14 51 2779 C51

Vssd1 SCOR2 SC2_AUDIO_OUT_R
2U2
2774
9148 15 50 470P
3753* 5753
+5B Vddd1 Vssa4
1R FERRITE
2753
470N 2785
RES 16 49
CRESET Vssd2
2754
*

1U
17 48 2764 * C65
Vssd4 SCOL1 SC1_AUDIO_OUT_L
2763 2U2
*

470P
18 47 2762 * C64
XTALI SCOR1 SC1_AUDIO_OUT_R
2761 2U2
*

1750 470P
+3V3 24.576MHz 19 46
XTALO Vref2
2760
3764
47U
C56 20 45
3702
SWA P2 i.c.
+8E RES
2720 TP41
*

RES 21 44 3705
2703
SYSCLK i.c. RES 9704 5702
100R 1/2W +5B
JMP
3704 7702
BC337 9703
22 43 +5C
SCK Vssa2
GND GND RES
2702
47U
GND GND 23 42
3706
WS i.c. 100R
3703 *
GND GND_AUDIO
330R 6702
*

24 41
C5V6 2%
SDO2 i.c.

25 40
SDO1 Vref(n)

2759
26 39 47U
SDI2 Vref(p)
3756
270R
27 38
SDI1 Vdec2
2758
*

470N E4 - 2ND SCART-

28 37 2780 * 3761 C58
TEST1 SCIL2 SC2_AUDIO_IN_L
E2 - MULTI - 2788 330N 15K
RES
*

B45 3760 2755 * 29 36 2781 * 3758 C57

AM_AUDIO_OUT MONOIN SCIR2 SC2_AUDIO_IN_R
9762 9761 2K2 470N 2789 330N 15K
RES
3710 *
30 35
TEST2 Vssd3 E74
9710 MONO_AV
GND GND
2782 * 3763 31 34 3755 2757 *
C60
AV_AUDIO_IN_R EXTIR SCIR1 SC1_AUDIO_IN_R
C63 2790 15K
RES
*

2783 * 3762 32 33 3754 2756 *

C59
AV_AUDIO_IN_L EXTIL SCIL1 SC1_AUDIO_IN_L
C62 2791 15K 330N
RES
E74 9714
*

MONO_AV
6. Electric Diagram (Divertisy tables)
MONO STEREO
14" 21" 21" 21" 21" 21" 21" RF 21" RF
VST PLL * SAMSUNG THOMSON LG PHILIPS SAMTEL THOMSON PHILIPS
1W 2W 4W + 4W 5W + 5W
A2 YES --- A8 YES YES --- --- 2445 --- 220P --- 470P 220P --- --- 1N
A5 YES --- B5 YES YES --- --- 2446 8N2 8N2 8N2 8N2 9N1 8N2 7N5 6N8
A6 YES --- C3 --- --- YES YES 2450 470N 470N 330N 390N 470N 330N 270N 220N
A7 --- YES C4 YES --- YES YES 3238 --- 1R 1R --- --- 1R 1R ---
1001 UV1315AI CTF5560 C5 --- YES --- --- 3415 5R6 3R3 3R6 3R3 3R6 3R6 3R6 3R6
3007 100R 100R C6 --- --- YES YES VCC_LINE +101.5 +104.5 +106 104.5 +104.5 +107 +123.5 +121.5
3026 100R 100R C7 --- --- YES YES
3612 10K JMP E --- --- YES YES
1SCART 1SCART
3680 --- JMP 48 YES YES --- ---
1SCART +LATERAL AV + FRONT AV 2SCART + AV
6602 HZT33 BZX79-C33 1540 T 630mA L T 1A L T 2.5A L T 2.5A L MONO MONO
2102 1 SPEAKER 2 SPEAKER A1 --- --- --- YES
* SOFTWARE MASK /1513 /1515 /1516 3N3 3N3 33P 33P
2103 66 --- YES A3 YES YES YES ---
10U 10U --- ---
2105 9145 JMP --- A4 --- --- --- YES
2U2 2U2 --- ---
14" 20"/21" 21" RF 2106 B6 --- --- --- YES
--- --- 22N 22N
2187 C1 --- --- --- YES
B3 YES --- --- 220U 25V 220U 25V 1000U 25V 1000U 25V
2188 C8 --- YES --- YES
B4 --- YES YES 220N --- --- ---
STEREO STEREO
2189 C9 --- --- YES ---
2208 1U 200V 10U 250V 10U 250V --- 220N --- --- NICAM+A2 A2
2196 2714 --- 18P --- 18P
2445 SEE CRT TABLE --- --- 10N 10N 7701 TDA9875A/2 TDA9870A/2
2533 2757 --- 0R05 0R05 330N
2446 SEE CRT TABLE 10U 25V 10U 25V 100U 25V ---
2540 680U 16V 2782 330N 330N 330N 330N
2448 10U 200V 47U 200V 47U 200V 680U 16V 1500U 25V 1500U 25V
2850 2783 --- 0R05 0R05 330N
2450 SEE CRT TABLE 220P 220P --- ---
2852 2825 0R05 0R05 0R05 2U2
2505 56U 400V 56U 400V 68U 385V 220P 220P --- --- OLD NEW
2856 MICRO * MICRO 3662 270R 270R 270R ---
3028 220K 220K 270K --- --- 330P 330P
2859 C2 YES --- 3671 100R 100R 100R 3K
3206 --- 1M 1M --- --- 330P 330P
2860 3879 47K 24K 3714 --- 100R --- 3K
3214 560R --- --- 4N7 4N7 330P 330P
3183 3898 --- 1K 3762 --- 0R05 0R05 15K
3217 560R --- --- 6K2* 6K2* --- ---
3184 9140 --- JMP 3762 15K 15K 15K 15K
3220 --- 560R 560R 5K6 5K6 JMP JMP
3190 9763 JMP --- 3805 --- 0R05 0R05 ---
3221 --- 560R 560R --- --- 1R 0.5W 1R 0.5W
3193 9296 --- JMP JMP JMP
3235 1R 0.33W 2R 0.5W 2R 0.5W 0R05 0R05 --- --- * SOFTWARE MASK /0763 /0776 /0946 /1052
3196 9714 --- JMP JMP ---
3238 SEE CRT TABLE --- --- 0R05 0R05
3511 9891 JMP JMP JMP ---
3413 270K 360K 360K 3K3 3K9 6K8 6K8

3415 3572 --- --- 820R 820R

SEE CRT TABLE
3416 4R7 0.5W 3R6 0.5W 3R6 0.5W 3808 0R05 0R05 --- --- MONO STEREO
3446 560R 1/2W 820R 1/2W 820R 1/2W 3810 0R05 0R05 --- --- PAL PAL PAL/SECAM PAL PAL PAL/SECAM PAL/SECAM
PAL/SECAM
3447 560R 1/2W 820R 1/2W 3850 8K2 8K2 270R 270R BG I BG DK BG L L' BG I BG DK BG L L'
820R 1/2W
3452 33R 0.33W 1R 0.5W 1R 0.5W 3852 8K2 8K2 270R 270R B1 --- --- --- YES --- --- --- YES

3457 47R 1W 10R 1W 10R 1W 3854 100K 100K 47K 47K B2 --- --- --- YES --- --- --- ---

3460 7K5 0.5W 6K2 0.5W 6K2 0.5W 3856 --- --- 47K 47K E1 --- --- --- --- --- --- --- YES

3480 --- 1K2 1W 1K2 1W 5525 SOPS MONO SOPS MONO SOPS 4W+4W SOPS 5W+5W E2 --- --- --- --- --- --- --- YES

3519 5K1 4K7 5K1 5538 JMP JMP FERRITE FERRITE 1015 G1961/G1975 J1952 K2955 K2962 G1984 J1981 K2977 K2962

3530 FERRITE 6449 BYT42M BYT42M BYW32 BYW32 1032 5.5 6.0 5.5 5.5 5.5 6.0 5.5 5.5
4R7 3W 4R7 3W
220K 6540 BYT42M BYT42M --- --- 1033 --- --- 6.5 6.0 --- --- 6.5 6.0
3531 180K 180K
3541 22R 0.5W 6541 --- --- BYV98-200 BYV28-200 2017 47U 47U 47U 100U 47U 47U 47U 100U
47R 1W 47R 1W
7187 TDA8941/N1 TDA8943SF/N1 TDA8944J TDA8946J 2191 JMP JMP JMP JMP JMP JMP JMP JMP
5445 LOT 14" LOT 20/21" LOT 21" RF
5480 --- 84UH 9004 --- --- JMP JMP 2608 --- --- --- 10P --- --- --- ---
DC-12
37551 9113 JMP JMP --- --- 2609 --- --- --- 10P --- --- --- ---
5500 35001 37551
BAV21 9143 JMP JMP --- --- 3020 0R05 0R05 0R05 12K 0R05 0R05 0R05 12K
6230 JMP BAV21
13V 9144 --- JMP --- --- 3125 --- --- --- 10K --- --- --- JMP
6413 11V 13V
BY448 9151 --- JMP --- --- 6020 --- --- --- 2V4 --- --- --- 2V4
6447 RGP15M RGP15M
9449 --- --- JMP JMP 9608 --- --- --- YES --- --- --- ---
7401 TDA8357J/N2 TDA8359J/N2 TDA8359J/N2
7445 BUT11AF 9450 --- --- JMP JMP 9609 --- --- --- YES --- --- --- ---
BUT11APX-1200 BUT11APX-1200
--- 9802 JMP JMP --- --- TXT TDA9350PS/N2 TDA9350PS/N2 TDA9351PS/N2 TDA9351PS/N2 TDA9350PS/N2 TDA9350PS/N2 TDA9351PS/N2 TDA9351PS/N2
9480 JMP ---
7015
9809 JMP JMP --- --- NO TXT TDA9370PS/N2 TDA9370PS/N2 TDA9381PS/N2 TDA9381PS/N2 TDA9370PS/N2 TDA9370PS/N2 TDA9381PS/N2 TDA9381PS/N2
9575 22R 0.5W 47R 0.5W 47R 0.5W

*NOT PLACED IN SOFTWARE MASK /0763 AND /0776

12
7.- CIRCUIT DESCRIPTION
7.1.- SMALL SIGNAL & MICROCONTROLLER/TEXT (Diagram A)

The small signal is processed by IC 7015. This IC called Ultimate One Chip (UOC) also has an embedded
microcontroller.
The CTR-AA chassis is designed to use 5 possible IC's in position 7015, 3 for PAL systems, (TDA9350 with teletext;
TDA9380 and TDA9370 without teletext) and 2 for multi-standard sets (TDA9351 with teletext; TDA9381 without
teletext). The associated circuitry is the same for TXT and non-TXT models.

In this chapter 7.1 TV sets with mono sound and PAL systems are explained. The associated circuitry for
sets with SECAM L/L' systems is explained in chapt. 7.7, whereas for stereo sets can be seen in chapt. 7.8.

The small signal part includes IF detection, video processing, chroma decoder, RGB, sync processor and sound
decoder (mono sets). It is fully controlled by the embedded microcontroller.
The microcontroller contains a specific program that assures all the functions of the appliance, including 2 menus,
one to control the set (see Instructions Manual) and another for Service Mode (see Service Instruct. chapter 8).
The IC for TXT sets (TDA935x) contains a teletext decoder, including the following functions: TXT on/off, reveal,
freeze, temporary cancellation, clock, subcode, zoom, index, flof, page +/-, X/26 and 8/30 packet decoding (station
identification and start-up page).

Fig. 7.1: TDA93XX block diagram

7.1.1.- IF detection
IF detection is intercarrier type, that means that sound and picture are detected in the same circuit (PIF).
- IF amplifier (pins 23, 24): The IF signal coming from pin 11 of the tuner (1001) is filtered by the IF SAW filter (1015)
and applied to IF amplifier of IC7015 by means of pin 23 and 24 input. The IF bandpass characteristic is determined
by the SAW (Surface Acoustic Wave) filter.
- PLL demodulator (pins 37, 58, 59): The IF-signal is demodulated by means of a PLL detector, which one is used to
regenerate the IF reference signal. Reference signal is determined by the PLL loop-filter pin 37 and calibrated by
microcontroller crystal (pins 58, 59). It is alignment free.
Demodulation is achieved by multiplying reference signal with the incoming IF-signal.
- AGC (pin 27): The IF AGC time constant is internally fixed. The tuner AGC voltage (pin 27) is applied to pin 1 of the
tuner and adjusted by microcontroller (see chap. 8.3).
- Video output (pin 38): This baseband CVBS signal with 2.5Vpp (sync inclusive) of nominal amplitude, contains the
FM intercarrier sound signal. Sound is filtered out by a ceramic trap (1032 or 1033) which frequency can be different
depending on the system: 5.5 MHz for BG, 6.0 MHz for I system and 6.5 MHz for DK system.

13 12
7.1.2.- Sound processor
- FM demodulation (pins 31, 29): FM sound is filtered from CVBS (pin 38) by a loop-filter (pin 31) and demodulated.
Decoupling sound demodulator is made by a capacitor on pin 29.
- De-emphasis and audio out (pin 28): De-emphasis is made by C2102 at pin 28. The signal at this pin is driven to the
euroconnector sound output (see Diagram C) by transistor 7104.
- External audio input (pin 35). The External Audio signal from pins 2 and 6 of Euroconnector 1 (or from the Audio in
the A/V connector, if the set has one) enters through this pin. The selection of external or internal audio is made
through an internal switch, which is controlled by bus I²C (see INT/EXT, chapt. 7.1.8)
- Audio out (pin 44): After a volume control (by I²C), this output is driven to the input IN+ of the final sound amplifier
IC7187 (Diagram C).

7.1.3.- Video processing

- Video switches (pins 40, 42): The internal CVBS signal proceeding of pin 38 is now fed to pin 40 of 7015. External
CVBS proceeding from pin 20 of Euroconnector is present on pin 42 of 7015. The IC switches between internal and
external are controlled by I²C bus (see INT/EXT, chapter 7.1.8).
The selected CVBS signal is internally supplied to the synchronization, teletext acquisition circuits and the video
identification circuit for IF ident.
- Luminance processor: CVBS is also internally applied to luminance processor, which is composed of chrominance
trap filter, luminance delay line and peaking circuits. Sharpness control modifies peaking by I²C.

7.1.4.- Chroma processing

This circuit is an internal (no pins associated) automatic decoder for Pal and NTSC systems commanded by I²C bus.
- ACC and chroma filter: Video signal coming from video switches is supplied to PAL/NTSC chroma bandpass filter
via a variable gain amplifier which is controlled by ACC and ACL detection circuits.
The dynamic range of the ACC is 26dB and detects only the burst amplitude. The ACL is a chroma amplitude
detector and is active when the chroma/burst ratio exceeds approximately 3. It ensures that CVBS signal to chroma
bandpass filter is limited for large.
- PLL/DCO: Chroma PLL is integrated and it operates during the burstkey period; the DCO (digital controlled
oscillator) generates a subcarrier signal Fsc in phase-lock with the incoming burst signal. The reference signal for
the DCO (Fref.) is derived from the crystal oscillator (1679). Different colour frequencies are internally switched by
I²C. The hue control rotates the DCO reference phases (H0, H90) from -40 to 40 degrees for NTSC signal via I²C
bus.
- PAL/NTSC demodulation: The 0ª & 90ª signals are supplied to the burst demodulator circuits to obtain (B-Y) and
(R-Y) respectively. Chroma delay lines used in demodulators are internal.

7.1.5.- RGB processor

- External RGB inputs (pins 46, 47, 48): RGB inputs coming from euroconnector (see diagram C), are AC coupled
(C2291/92/93) and converted internally in YUV signals. Then are switched with internal YUV (YUV SWITCH) by fast
blanking.
- Fast blanking external (pin 45): When fast blanking is high external RGB is displayed, only if TV is in external AV
(program 0). Fast blanking can switch signals for full screen (by a DC voltage) or for a part of the screen (by a pulse
voltage).
- Matrix: After switching, YUV signals are converted to R-Y, G-Y and B-Y in the internal MATRIX circuit. Saturation
control is received by I²C bus.
- Black stretcher: Internally the luminance signal is connected to the YUV select circuit and via the input clamps it is
supplied to the black stretcher. The black stretcher circuit, fully integrated, extends the grey signal level. This
extension is dependent upon the difference between actual black level and the darkest part of the incoming video.
RGB adder: RGB signals are obtained in this circuit by adding R-Y, G-Y and B-Y proceeding from matrix and Y
proceeding from black stretcher.
- RGB OSD: RGB inputs for OSD and TXT are internally inserted to RGB signals. Fast blanking used is also internal.
45).
- Beam current limiter (pin 49): The beam current limiter circuit functions as an average beam current limiter (BCL)
as well as peak white limiter (PWL). Both functions reduce the contrast and brightness of RGB signals.
Contrast reduction begins when Vpin 49 < 3.1V and brightness reduction begins when Vpin 49 < 1.8V.
BCL: Average beam current present at pin8 of 5445 (Diagram D) is feedback to pin 49. When beam current is high,
voltage of C2462 is lower, D6462 conducts and Vpin 49 decreases.
PWL: This circuit is an internal detection circuit, which comes into action if the difference between measurement DC
level and white level exceeds approximately 2.6V. Then a current of 200µA is internally produced to discharge 2298
and Vpin 49 decreases.
- RGB output circuit (pins 51, 52 and 53): RGB outputs are driven to RGB amplifier (Diagram B).
- Continuous Cathode Calibration (CCC) (pin 50): This circuit is an auto-tuning loop which stabilizes the black level
(offset) as well as the cathode drive level (gain) of each gun. Pulses in 3 consecutive lines R, G and B (pins 51, 52,
53) at the end of frame blanking are used on alternating fields, one field for black level, following for cathode drive

14
level.
Cathode currents of 8mA for black level and 20mA for cathode drive level are stabilized. Cathode current is present
at pin5 of IC7200 (Diagram B) and measured on pin 50 (Cut-OFF Info). RGB outputs are adapted to keep cathode
currents measured, for example when VG2 voltage is adjusted, DC level of RGB outputs is automatically corrected.
- Warm-up detection circuit (pin 50): At the start up a DC voltage of 2.5V is present in the RGB outputs (pins 51, 52,
53). As soon as beam current is detected on pin 50, RGB circuit starts in normal operation. If RGB circuit is damaged
or grid 2 is low, the RGB circuit could not start (black picture) due to current is not detected.

7.1.6.- Horizontal synchro

- Start up: The horizontal oscillator starts is commanded by microcontroller. During start up circuit provides a softer
operating horizontal output with a higher frequency.
- Hor. sync. separator: Fully integrated sync. separator with a low pass filter, slicing level at 50% of the synchronized
pulse amplitude.
- Horizontal Phi 1 detector (pin 17): This circuit locks the internal line frequency reference on the CVBS input signal.
It is composed of a phase comparator and an internal VCO of 25MHz (1600*15625). The free running frequency is
stabilized using the 12 MHz reference of the X-tal oscillator.
Phi 1 detector filter is made by external components at pin 50. Phi 1 time constant is automatically controlled by
software for broadcasting signals. For video signals (AV and program 99) constant is always fast to prevent top
bending on the screen.
- LBF (pin 34): Line Fly Back input, is obtained by the network R3456/C2408 (Diagram D) and R3371/R3372.
- Sand Castle (pin 34): Sand Castle output obtained at this pin is used only internally. Levels of sandcastle pulse are
5.3V for burst detection, 3V for line blanking and 2V for frame blanking.
- Horizontal Phi 2 detector (pin 16): The flyback position respect line blanking on TRC cathode is controlled by this
circuit. Phi 2 detector filter is made by C2305 pin 16. Horiz. shift can be adjusted by I²C (see chapter 8). EHT
compensation is made through R3305.
- HOUT (pin 33): Horizontal output is an open collector which one drives the horizontal driver stage (T7440 diagram
D).

7.1.7.- Vertical synchro and vertical drive

- Vert. sync. separator: It is an internal integrator to separate frame sync. pulses from CVBS.
- Vertical divider system: The divider system uses a counter that delivers the timing for the vertical ramp generator in
the geometry processor. The clock is derived from the horizontal line oscillator. Mode used is automatic 50/60Hz
identification with 50Hz priority.
- Vertical sawtooth generator (pin 25, 26): A reference current of 100mA is realized at pin 25 by means of an internal
reference voltage (3.9V) and resistor R3341. This 100mA reference current is used to derive a 16mA current to
charge C2340 (pin 26) during vertical scan. The charge current can be adjusted with the I²C bus control, (VERT.
SHIFT). The external capacitor is discharged during vertical retrace by the vertical divider system.
- Vertical geometry processor: The saw tooth signal that is derived from the sawtooth generator can be controlled by
I²C bus. Control adjustments are: S-CORRECT, VERT.SLOPE, VERT.AMP and VERT.SHIFT (See chapter 8).
- Vert. output stage (pins 21, 22): The vertical geometry processor has a differential current output to drive a DC
coupled frame deflection (7401).
- EHT compensation (pin 36): A voltage inversely proportional of beam current, proceeding of pin 8 of line
transformer (5545 diagram D) is applied to pin 36 to stabilize vertical amplitude from EHT variations.
- Vertical guard input (pin 50): A vertical retrace pulse proceeding from pin 8 of IC7401, is added to cut-off voltage at
pin 50 (this pin has 2 separated functions, cut-off function see chapter 7.1.5). If there is not pulse or its level is not
correct (should be above 3.65V, 0.8msec.), the set goes to standby mode. (See chapter 7.6.1 Protections).

7.1.8.- Microcontroller/ Teletext

CTR chassis can work with several different microcontroller versions. The numbers that appear at the end of the
description of the IC 7015 indicate wich is the software mask version: TDA93xxPS/N2/MMMM.
Versions /0586,/0763,/0776,/0946 and /1052 correspond with the same software used in the previous CTU chassis.
New software versions, /1196 and /1227, have now been introduced which make it possible to control a chassis with
double scart, adding some new features like format function 16:9, which is accessed through the remote control
(and with automatic Scart switching), the Plug & Play start up menu and the External and Sleep-timer keys.

Following there is an explanation of the different functions of the microcontroller indicating pins number assigned:
- Tuning: The different systems available depend on the models in question, these could be Voltage Synthesized
Tuning (VST) or Phase-Locked-Loop tuning (PLL).
* Voltage Synthesized Tuning (pins 4, 11 and pin 8 or 10): this system works by tuning to a station on the tuner
through a linear variation of the tuning voltage (V-VARI) from 0V to 33V applied on pin 2 of the tuner. It is generated
on pin 4 of the µC and converted to an adequate level for the tuner using T7605.

While searching, µC are always reading internally AFC (Automatic Frequency Control) and video identification

15
signals.
When video signal is identified, µC stops searching and do a fine tuning to reach a right AFC value.
- Band switching: There are two outputs for band switching pin 11 for VHFI and pin 8 (one scart chassis) or pin 10
(double scart chassis) for VHFIII. The µC controls the channel band in the tuner by a voltage of +5V at the
correspondent output. UHF band is controlled by means of transistor 7601. If the set is in VHF, one of the pins VHFI or
VHFIII are high and transistor conducts in such a way the UHF voltage is 0V. If the set is in UHF, pins 8 and 11 are low,
transistor is cut and the set is in UHF.

* PLL Tuning (pins 11 and 8 or 10, depending on the chassis external connectors): The tuning and band switching
are totally controlled through bus I²C, which is based between pins 8 (chassis 1 scart) or 10 (chassis double scart) and
11 of the µC, and pins 4 and 5 of the tuner (1001). Neither the varicap voltage nor the band switching is used. Pin 2 of the
selector has an extra voltage of 33V, stabilised by the zener 6602
- Control key (pin 5): Pin 5 is activated by a DC voltage. When control keys are not activated, a voltage of 3V3 is
produced by R3618. If one control key is activated, this pin is connected to ground directly or by a resistor R3665, R3667
(Diagram B), decreasing its voltage.
There are 3 voltage levels depending of the key used: 0V for MENU, 1V for P- and 1.9V for P+.
- Mute output (pin 6): This pin is a 3 state output used to control the sound amplifier (see chapter 7.4). States are 0V,
open and Vcc (3.3V). In a chassis with new software version it is also used to generate the Standby signal from the
source.
- INT/EXT1 input (pin 7): The set can switch to external (AV on the screen) by remote control (selecting program 0) or by
rise edge at pin 8 of euroconnector (see diagram C). The IC switches internally video and audio to external. In both
cases the user can switch to internal changing the channel.
If the set includes function 16/9, it will switch to that function directly through INT/EXT (between 4,5 and 7V), although it
can also be modified through the remote control.
- INT/EXT2 input (pin 8 in a double scart chassis): the TV can switch to the second euroconnector input through the
remote control handset (External key), or alternatively through pin 8 of euroconnector 2 (see diagram C).
- LED (pin 10 in one scart TV sets or pin 8 in double scart TV set): The LED (D6636 or D6663 diagram B) lights up with a
low current when the television set is ON and with a high current when the set is in Standby. While the set is receiving a
remote control signal, the led is blinking.
- Picture controls (brightness, contrast, colour, sharpness) are processed internally by I²C bus.
- Sound controls: Sound controls are processed internally by I²C bus
- Standby: When the set is switched to stand by, line stops (pin 33). In addition to this, pin 1 with old software masks, pin
switch to low level to make Power Supply in burst mode (see stand by 7.5.4). In new software masks, this function is
realized through mute control pin.
- OSD outputs: The RGB and fast blanking signals used for On-Screen Display (OSD) and also for TXT are internally
inserted to RGB outputs (pins 51, 52, 53).
- Oscillator (pins 58, 59): A 12-MHz oscillator is determined by a 12-MHz crystal (1679) between pins 58 and 59.
- P.O.R (pin 60): Power on reset (POR) is internal, activated when the set is switched on. If the µC shows abnormal
behaviour it is advisable to reset it switching off/on the set. Reset can be done also by a short circuit between pins 60
and 61.
- RC5 (pin 62): The commands transmitted by the remote control handset are received by infrared receiver (1685
diagram B) and passed to the microcontroller for decoding.
- EEPROM (pins 63 and 64): The microcontroller is connected to non-volatile memory IC7685 (EEPROM) via bus I²C.
The following information is stored in the memory:
- Channel data including tuning voltage and band of all the channels.
- Personal preferences (PP), menu mix and child lock on user menu.
- All settings included on Service Menu.

7.1.9.- Supplies and decoupling

- Small signal analog supply (pins 14, 39): The same +8V supply coming from line deflection is connected to pins 14 and
39 for small signal processing. A separated supply (C2036) feeds video and sound traps circuit.
If +8V supply is not present at pin 39 or pin 14 during the first 4 seconds after switch ON the TV set, the microprocessor
goes to Standby mode (See chapter 7.6 Protections).
- Digital supply (pins 54, 15): A +3V3 supply is used for digital circuit of TV processor (pin 54). A decoupling capacitor for
this supply is present at pin 15 (C2301). Pin 54 is used also to supply the µC.
- Bandgap decoupling (pin 19): The bandgap circuit provides a very stable and temperature independent reference
voltage of 4.0 V which one is used specially in the analogue video processor part.
- µC supplies (pins 54, 56, 61): The µC has several +3V3 supplies,
?Pin 54: Analogue supply (Oscillator, ADC).
??Pin 56: Digital supply to µC core.
??Pin 61: Supply to all output ports of the µC.
When the set is in stand by, the µC switch to stand by mode, only 3V3 supplies are present but consumption is reduced.

16
7.2.- RGB AMPLIFIERS (diagram B)

The RGB signals available at pins 51, 52 and 53 of IC7015 (Diagram A) must be amplified and inverted in order to
reach the level required for driving the tube. The integrated circuit IC7200 (TDA6107) is used for this purpose.
RGB inputs (pins 2, 3, 1): These signals are connected to negative inputs of internal operational amplifiers. There is
and internal reference voltage of 2.5V for the amplifiers. Negative feedback of amplifiers are internal resistors.
RGB outputs (pins 8, 7, 9): These outputs are applied to the RGB cathodes of the tube. Series resistors (3203, 3216
and 3229) are added for flash-over protection.

- Cathode current feedback (pin 5): Cathode current used in Continuous Cathode Calibration circuit (See 7.1.5) is
obtained at this pin and feedback to pins 50 of IC7015 (Diagram A)
- White adjustment: Gain and cut-off point of RGB amplifiers can be adjusted by I²C in the service menu (See chapter
8)
- Anti-spot circuit: When the set is switched off, the capacitor 2208 keeps charged and a negative voltage is put at
VG1 of the tube.

7.3.- DEFLECTION (Diagrams A, D)

7.3.1.- Frame deflection (Diagrams A)

Full bridge vertical deflection output performed by the integrated circuit TDA8357J/TDA8359J (7401).
- Frame supplies (pins 3, 6): There are 2 supply voltages, +15V (pin 3) is the main supply and +55V (pin 6) is used to
supply the output stage during flyback time.
- Vertical inputs (pins 1, 2): (pins 21, 22): The output currents proceeding from pins 21, 22 of IC7015 are converted to
voltages by resistors R3411/12 in such a way that 2 inverted sawtooth are present in the differential inputs of
amplifier (pins 1, 2).
- Vertical outputs (pins 4, 7): Vertical output is DC coupled to deflection coil. That means linearity adjustment is not
necessary.
- Feedback input (pin 9): A voltage proportional to current deflection is present in R3415/16 and a feedback to pin 9.
HF loop stability is achieved by a damping resistor R3402, wich needs current compensation during flyback pulses,
wich is obtaniend through R3413 and D6413.
- Vertical flyback: This signal is internally added to vertical output (pin 7) using supply voltage at pin 6.
- VGUARD circuit (pin 8): This circuit generates a high level during flyback period, and is used to protect the TV set in
case of a vertical failure. (See protections, chapter 7.6)

7.3.2.- Line deflection (Diagram D)

The final line transistor is driven by the transformer 5441, whose primary winding is driven by the transistor T7440
connected to the line drive output of IC7015 (pin 33).
The horizontal deflection stage is carried out in a conventional way, with the deflection transistor (T7445) and line
transformer (5445).
Beam current info (BCI) is present at C2460.
There are the following supply voltages obtained from line transformer (5545):
- Frame supply (+15V):Main frame supply present at capacitor C2455.
- +55V: This supply is found at the 2455 capacitor and is used for frame flyback, to supply line driver (T7440) and for
varicap voltage (+33V, D6602 diagram A)
Note: Before the line is started, the driver is supplied by the +13C voltage from the power supply (C2540).
- +8V: This voltage is used for small signal circuits and is present at C2467 capacitor.
- +5V stabilized: An additional voltage of +5V for tuner (1001 diagram A) is obtained from +8V by D6479 and T7479.
- FF: The heather voltage is reduced by R3235/38 and 5235 (Diagram B) to obtain 6.3Veff at the CRT (see CRT table
Chap. 10.2).

7.4.- SOUND AMPLIFIER (Diagram C)

Sound amplifier is a Bridge Tied Load (BTL) amplifier including short circuit protection, mute and standby mode.
IC used can be TDA8941P for 14" and 17" models, TDA8943SF for 20" and 21" models. Behaviour is the same for
both models.
- Supply (Vcc, SVR): Main supply (Vcc) is taken from +13A of Power Supply (C2540 diagram D). The IC creates
internally a half supply, present in SVR pin and decoupled by 10uF capacitor (C2182).
- Sound input (IN+): Amplifiers have differential inputs (IN+,IN-). Audio input is connected to IN+ decoupled by
220nF capacitor (C2181/85) and IN- is decoupled to ground by other 220nF capacitor (C2179). To avoid oscillations
there is a 1n5 (C2198/95) capacitor connected between both inputs.
- Mode input (MODE): This input is commanded by mute signal proceeding from the µC (pin 6 of 7015 diagram A)
and has three modes depending of the voltage level:
* Standby mode (Vmode = Vcc): Consumption is very low (used during stand by).

17
In this case Vmute=0V, T7657 and T7659 are cut, MODE signal is high
* Mute mode (2.5V<Vmode<Vcc): No sound output (used when the set is switched on/off, there is no signal,
channel search, change of program, etc.)
In this case pin 6 of 7015 is open T7659 conducts (by resistor divider), T7657 are cut and MODE voltage is 5,5V.
* Operating mode: (Vmode<0.5V): Sound output present (normal operation). In this case Vmute=3V3 both
transistors conduct, mute signal is low.
- Sound output (OUT+/OUT-): Amplified sound is driven to the loudspeaker.

Headphones output has been connected in such a way that when headphones are connected, loudspeaker is
switched off.

7.5.- POWER SUPPLY (Diagram D)

Mains isolated switched mode power supply (SMPS). controlled in variable frequency mode.
IC7514 (KA5Q0565RT) includes control circuit and output MOSFET. Output feedback is done by means of an
optocoupler (7515).
- Switching behaviour: The switching period is divided in on-time, when energy is extracted from the mains into the
primary winding (8-12 of 5525), off-time, when energy in the transformer is supplied to the loads via secondary
windings of 5525 and dead-time when no energy is extracted or supplied.
- Standby mode: Output voltages are present when the set is in stand by. Standby is done cutting line deflection and
making the supply in burst mode in such a way that power consumption is very low.

7.5.1.- Degaussing and Rectifier

- Degaussing: R3501 is a dual PTC (2 PTC's in one housing). After switch on set, PTC is cold so low-ohmic and so
degaussing current is very high. After degaussing, PTC is heated so high-ohmic, so in normal operation degaussing
current is very low.
- Rectifier: Mains voltage is filtered by L5500, full wave rectified by diodes D6502-D6505 and smoothed by C2505
(300V DC for 220V AC mains).

7.5.2.- Regulation
- Power MOSFET (pin 1): Power stage is done by an internal MOSFET between pin1 and ground. Current is sensed
by an internal resistor and limited to 5A peak. (See chapter 7.6.2 Protections)
- Start up and supply (pin 3): When the set is switched on, a current via R3527 and R3528 is applied to pin 3. When
C2514 is charged to 15V, the power supply starts and the internal MOSFET conducts. A voltage across transformer
windings is built up. The voltage across winding 4-2 is rectified by diodes D6523/25 and used to supply the IC on pin
3.
Voltage of pin3 depends on the output voltage and is about 24V. If Vpin3 is lower than 9V supply stops and if it is
higher than 28V, output voltage is limited. (See chapter 7.6.2 Protections)
- Sync (pin 5): A pulse voltage proceeding from winding 4-2 is applied to this pin. A delay is added by means of
C2524, R3522 and R3526 to synchronize starts conduction of MOSFET at minimum Vds voltage.
- Secondary feedback (pin 4): Line supply feedback is obtained at pin 4 by divider R3531/34/19, the differential
amplifier (IC7533) and the optocoupler (IC7515). Voltage at this pin is about 1.1V
- Output regulation: IC7514 stabilizes output voltage by controlling T-on and so the frequency and the duty cycle.
Output control is done by the following way:
If line output is higher, current input of the differential amplifier (IC7533) is higher (amplifier has a reference voltage
of 2.5V).
Current in IC7533 and also in the optocoupler (IC7515) is higher.
Voltage in pin 4 is lower, T-on is internally reduced and output is reduced.
Output voltage of supply can be adjusted by R3518.

7.5.3.- Secondary side

- Line supply: Line supply present at capacitor C2530 should be adjusted to the correct value (depending on the
TRC) by means of P3534.
- Sound supply (+13V): This supply is used for sound output amplifier and to feed 3V3 stabilizer.
- µC supply (+3V3): +5V3 is regulated by T7575, D6570 and T7571.

7.5.4.- Stand by
When the set is put in standby, line driver (pin33 of IC7015, diagram A) stops and deflection supply is not loaded.
Only a reduced load to supply the µC (+3V3) is necessary.
To reduce more the power consumption, during standby T7572 is cut by STBY signal (pin1 or pin 6 of IC7015,
depending on software version, diagram A), then current in IC7533 is increased by means of D6531 and output
voltages are reduced.
As a consequence of this, the supply switches to burst mode operation. During working time C2514 is charged till
12V, then supply stops and C2514 is discharged till 11V.

18
7.6.- PROTECTIONS

If TV does not start or it switches to stand by, try to start again in a few minutes and if problem remains check
protection pins explained following.

7.6.1.- Protections in IC7015 (Diagram A)

- Pins 14, 39:
If +8V supply is lower than 6V (pin 39 or pin 14) during the first 4 seconds after switch ON the TV set, the
microprocessor goes to Standby mode (See also chapter 7.1.9).
- Pin 50:
If the vertical retrace pulse at this pin is not correct (should be above 3.65V, 0.8msec) during the first 4 seconds after
switch ON the TV set, the vertical guard blanks the RGB outputs and the TV switch to Standby (See also chapter
7.1.7).
This protection operates in the following situations:
- When the vertical deflection fails and there is no pulse.
- When the vertical retrace pulse is higher than 0.9msec. (for example vertical amplitude is too high)
- An extra protection is obtained when there is too much current in the CRT (for example +200V supply is missing),
because in this case, DC level of pulse is lower by means of cut-off signal. (See fig. 7.6.1)

Fig 7.6.1: Pin 50 correct signal

To repair the set more easily, Vguard protection can be disabled, in this case the vertical guard blanks the RGB
outputs, but TV does not enter in Standby mode. To disable Vguard, item 8 of Service menu MANUAL C-O should be
01 (See chapter 8.1).
Due to a change in MANUAL C-O is difficult to do if the set switch to Standby, Vguard can be disabled also
connecting a diode (1N4148) in series with a 2K2 resistor between pins 10 and 7 of IC7015 (Anode at pin 10). Be
careful to disconnect this network after the set is repaired.

7.6.2.- Protections in IC7514 (power supply, diagram D)

- Over-current: Primary current is sensed on pin 1by an internal resistor for the IC. If this current is increased to 3.5A
peak, supply works in an intermittent way (ON and OFF). That can be provoked for a short circuit on secondary
outputs.
- Lock: If voltage on pin 3 is higher than 28V, over voltage protection limits output voltage. If voltage on pin 3 is lower
than 9V the under voltage protection stops the supply. This will not start again until the TV set will remain about 5
minutes switched off in order to allow C2514 discharging.

7.7.- SETS WITH SECAM L/L' SYSTEMS

Multistandard TV is achieved by means of small changes in CTR-AA chassis:

- To decoder SECAM signals, small signal IC(7015 diagram A) is changed toTDA9351 for TXT models and
toTDA9381 for no Teletext.
- To have specific software for multi standard, SYS OPTIONS Item of Service Menu should be adjusted at 04.
- For AM sound (standard L/L'), an extra circuit based onTDA9830 (7125 diagram B) is added.

7.7.1.- IF detection (IC 7015, diagram A)

- The UOC has an alignment free IF-PLL demodulator. SECAM-L' signals only occur in VHF band I and have their
picture and sound carrier interchanged, compared to SECAM-L and PAL-B/G channels. For SECAM-L' the IF

19
picture carrier is situated at 33.4 MHz and the AM-sound carrier at 39.9 MHz. The IF frequency is automatically
switched to the right frequency by the microcontroller. (33.40 MHz for SECAM-L' in France and 38.90 for Europe).
- The Saw Filter (1015) is changed to a double Nyquist slope filter (K2962).One slope at 38.9 MHz is used for PAL-
B/G and SECAM-L and the other at 33.4 MHz is used for SECAM-L'.
- The Tuner AGC time constant should be slower than for negative modulation, because the IC7015 reduces AGC
current, so AGC capacitor 2017 is bigger and an extra series resistor 3020 is necessary. To prevent IF over load
when jumping to a very strong transmitter (search-tuning), a diode 6020 is placed in parallel.

7.7.2.- Sound processor (IC 7125, diagram B)

AM demodulation: In Multi standard sets, also AM demodulation for LL' systems is necessary. AM sound is extracted
directly from the tuner instead of from base band video.
- AM input (pins 1, 16): IF signal containing AM signal at 32,4 MHz for L system or 39,9 MHz for L', is applied to pin 1
of a double SAW filter (1137). Filter is switched between this two frequencies depending on the system at pin 2 by
transistor T7103.
-AGC(pin3): C2109 is AGC related storage capacitor.
-AM Sound output (pin 6, 7, 8): The demodulated signal is present at pin 6 of IC 7125, goes to pin 7 across C2126,
and goes out from pin 8.

- AM /FM (mono sets) switching :

* For L/L' systems, AM sound goes through 7106 to the pin 28 of Ic 7015. In this case, the FM sound from IC 7015 is
muted.
* For BG systems, FM demodulation is made using the IC 7015 (seer chapt. 7.1.2). In this IC the AM sound is
supressed with a mute signal on pin 12 of the IC 7125, that is obtanied from the mC with the BG/L signal. This signal
also cuts the 7102 transistor to avoid the load of the input pin 28 of the IC 7015.

7.7.3.- Chroma processing (IC7015)

This circuit is an internal (no pins associated) automatic decoder for Pal and Secam systems commanded by I²C
bus.

7.8.- STEREO SETS

The CTR Stereo chassis is based on the TDA9875A chip for NICAM systems (digital stereo) and A2 (analog stereo),
and on the TDA9870A chip for only A2 (or Zweiton) systems. This is a single-chip Digital TV Sound Processor for TV
sets. In the stereo chassis the sound part in the IC7015 is disabled. All sound signals, analog (Stereo and MONO)
and digital (Nicam) are processed in IC7101 (TDA9875A). BG and DK standards use NICAM and A2 sound system,
and L and I standard only use NICAM.

7.8.1.- Sound IF (IC 7701 diagram E)

- SIF input (pin 12): SIF signal is filtered from video signal coming from pin 38 of IC7015 (Diagram A) by a passband
5.5MHz to 6.5Mhz filter (C2740/41/42 and L5741).
- AGC, ADC: SIF is passed through an AGC circuit and then digitized by an 8-bit ADC operating at 24.576 MHz. The
gain of the AGC amplifier is controlled from the ADC output. Then signal is separated in 2 ways, one for FM and other
for NICAM.
- NICAM demodulation: NICAM signal is transmitted in a DQPSK code at a bit rate of 728 Kbit/s. NICAM
demodulator performs DQPSK demodulation and feeds the resulting bitstream and clock signal onto the NICAM
decoder. A timing loop controls the frequency of the crystal oscillator to lock the sampling rate to NICAM decoder:
The device performs all decoding functions in accordance with the “EBU NICAM 728 specification”.
- FM demodulation: FM signal is fed via a band-limiting filter to a demodulator. If signal is stereo A2, decoder
recovers the left and right signal channels from the demodulated sound carriers. A stereo identification signal is sent
to the µC. If the signal is FM mono, the IC 7701 demodulates the signal too.
- Oscillator (pins 18, 19): The circuitry of the crystal oscillator is fully integrated, only an external 24.576 MHz crystal
is needed.

7.8.2.- Controls (IC 7701 diagram E)

- Control bus (pins 4, 5): Stereo is fully controlled for the µC of IC7015 (Diagram A) via I²C bus (pins 2 and 3 from
IC7015). Status information present in internal registers of IC7101 is read by µC to determine whether any action is
required. Control is exercised by the µC also, writing in other internal registers of IC7101.
- Audio processing: After demodulation, digital signal is selected (FM, A2 or NICAM) and processed according µC
control.
Following functions are provided: Forced mono, stereo, channel swap (between channel 1 and 2 with dual signals),
spatial effects (pseudo stereo and spatial), Automatic Volume Level (AVL), volume, balance, bass and treble.

7.8.3.- Audio Outputs (IC 7701 diagram E)

- DACs (pins 54, 55): Then signals are transformed to analog by DACs and sent to the outputs. Post filter capacitors

20
for DACs are at pins 54 and 55.
- Sound outputs (pins 60, 61): After a volume control (by I²C), sound outputs (MAIN R and MAIN L) are driven to the
inputs IN+ (pins 12 and 6) of the final sound amplifier IC7187C (Diagram C).
- Headphone outputs (pins 57, 58): Headphone outputs are driven by followed emitters 7780 and 7781 to the
headphones. These outputs are independent of loudspeakers outputs and controls are separated.

7.8.4- Sound Amplifier (IC187C diagram C)

The IC used in stereo models could be either TDA8944J (4+4W) or TDA8946J (5+5W). It's a double amplifier, that
means 2 supplies, 2 inputs and 2 outputs.
- It has very similar characteristics to TDA8941 and TDA8943, being different in that it includes two amplifiers. The
modes available are the same as those in IC TDA8941 and TDA8943 (see chapt. 7.4).
- Right channel input (IN2+, IN2-): The right side input is connected to IN2+ through a 220 nF (C2181) capacitor,
while the IN2- input is decoupled from earth by another 220 nF (C2179) capacitor. To prevent oscillations a 1n5
(C2198) capacitor is introduced between the inputs.
- Left channel input (IN1+, IN1-): The left side input is connected to IN1+ through C2184 (220nF), while the IN1- input
is decoupled from earth through C2193 (220nF). To prevent oscillation a C2183 (1n5) is used between the inputs.
- Sound outputs (OUT1+/-, OUT2+/-): The amplified sound is directed to the attached loudspeakers.

7.8.5.- IC 7701 Supplies

- +5V stabilizer: +5V supply for stereo processor is obtained from +12V (C2454 diagram D) by D6702 and 7478. This
voltage comes to supply voltages of IC1701 (pins 59, 15, 64)
- Digital supplies (pins 15, 64): +5V supplies at pins 15 and 64 are used for digital circuits of stereo processor.
Power ON reset (pin 16): When the set starts, C2754 is slow charged by an internal 50K resistor to +5V. When digital
supplies are present and oscillator is working, reset is done if pin 16 is low (Vpin16<1.5 V).
- Analog supply voltage (pin 53, 59): There is a +5V supply for analog outputs (DACs and operational amplifiers) at
pin 59. A 50% reference voltage (2.5V) for these circuits is present at pin 53.
- ADC supply voltage (pins 38, 39, 40 and 46): A 3.3V supply voltage is obtained internally and decoupled on pin 38
by C2758. Positive and negative reference voltage for ADC is present at pins 39 and 40. A 50% reference voltage
(1.65V) for ADC is present at pin 46.
- Front-end supply (pins 7, 8, 11): A separated 3.3V supply voltage (decoupled on pin 7 by C2750) is necessary for IF
demodulator. By means of a 200mA current generator at pin 8, a 2V reference voltage is produced at pin 7.

7.8.6.- External connections (Euroconnectors and the AV input)

Stereo sets are equipped with 2 euroconnectors and one Audio Video input per RCA connector. Euroconnector 1
has video (CVBS), audio and RGB inputs, while euroconnector 2 has video, audio and SVHS (CHROMA). The
euroconnector 1 input is always an internal signal (RF), while euroconnector 2 can be switched between internal and
the euroconnector 1 input (copy function).

The video switching goes through IC 7801 (TDA4053B), the SVHS and RGB switches in IC 7015 and the audio
switches in the stereo IC 7701. The control signals are activated through micro-controller (7015). In the event that
7701 should intervene, it will be controlled by 7015, by means of bus I²C.
- Video inputs: The 3 inputs coming from the euroconnectors and the audio jack go to IC 7801. The SWB control
signal comes from pin1 of IC7015, while the SWA signal comes from pin 20 of IC7701 and is controlled by bus I²C.
The µC controls the switching according to which external input is selected (Ext1, Ext2, AV through SWB signal) and
which euroconnector 2 output is selected through the user menu (through SWA signal).
- External audio input: External audio (R and L) proceeding of pins 6 and 2 of euroconnector 1 (Diagram C) is applied
to pins 33 and 34 of IC7101 and digitalized by an ACD circuit. Audio Inputs from Euroconnector 2 goes to pins 36 and
37. Pins 31 and 32 have the audio input coming from lateral AV connector. Selection between internal or external is
done from the µC (IC7015) by I²C bus (see INT/EXT, chapter 7.1.8).
- External audio outputs: Signal at pins 47, 48 are driven directly to the euroconnector 1 sound outputs (see Diagram
C). Pins 51 and 52 are the euroconnector 2 audio outputs.

7.8.7.- Multi Stereo TV Set (SECAM L/L')

- FM and stereo demodulation is done by IC 7701. AM is done by IC7125.
- The AM sound output of the IC 7125 is applied to pin 29 of IC 7701, the internal switching being automatic
depending on whether we select the demodulation of the AM sound or the demodulation of the NICAM carrier. Then
BG/L signal and transistors T7106/7102 are not necessary.
- The control signal for L/L systems comes from pin 9 of IC 7701.

21
8.- ELECTRICAL ADJUSTMENTS
8.1.- SERVICE MODE

The signal processor IC7015 is fully controlled by I²C, so that the most of adjustments of the set can be made by
service menu.
- Enter in Service mode:
- Select program 75 and press at the same time OSD key (+) on RC and MENU key on local key board during 4
seconds.
Service mode is indicated by an S symbol on the down left corner of the screen.
Note: Controls (volume, contrast, brightness and saturation) will be pre-adjusted to the mid position.
- Display Service Menu: When the set is in service mode it is possible to display Service Menu by OSD key (+) on RC.
Using P+, P- keys of remote control the different items can be displayed (see table 8.1):

PARAMETER ITEM Value PARAMETER ITEM Value

Nº Description Hex Nº (*) Nº Description Hex
1 ADJUST VG2 PRG 15 15 B GAIN 20
2 CATH.DRIVE 0C 16 16 S-CORRECT 20
3 TXT V-SHIFT 02 17 17 VERT.SLOPE 20
4 TXT H-SHIFT 02 18 18 HOR.SHIFT 20
5 V-GUARD DISA PRG 19 19 VERT.AMP 20
6 AGC START 25 20 20 VERT.SHIFT 20
7 OSD LEVEL 02 -- 21 16:9 ENABLED 01
8 MANUAL C-O 01 -- 22 16:9 RATIO 08
9 R CUT-OFF 20 -- 23 SECOND SCART 00
10 G CUT-OFF 20 -- 24 A/V CONNECTOR 00
11 BRIGHTNESS PP 21 25 SYS OPTIONS 00
12 CONTRAST PP 22 26 MENU OPTIONS 00
13 R GAIN 20 23 27 RESERVED -
14 G GAIN 20 24 28 READ STATUS PRG

Table 8.1. Service menu. Settings are hexadecimal values

Note: Column Nº (*) refers to micros with these guards: /0763 /0776 /0946 y /1052

- Pre setting values: When E2PROM is replaced, pre-setting values indicated on table 8.1 are stored by the µC. (see
8.7 E2PROM).
- Adjust by Service Mode: When an item is selected, using V+, V- keys of remote control it can be adjusted. Items V-
GUARD DISA, RESERVED and READ STATUS have fixed values = pre setting values, rest of items see 8.2 to 8.6.
- Remove service menu: There are 2 ways to remove service menu
- Saving the new settings: Using OSD (+), MENU or INSTALL keys on RC.
- Keeping the old settings: Switching the TV to stand by. Service mode continues active.
- Remove Service Mode: Switching off the TV

8.2.- POWER SUPPLY AND FOCUSING

- Power supply voltage:

Adjust brightness and contrast controls at minimum.
Connect a DC voltmeter across C2530 (Diagram D).
Adjust R3534 for a required voltage depending on the model and the TRC used (see CRT table, Chap. 10.2)
- Focusing
Adjust with the potentiometer placed on the line output transformer.

8.3.- AGC ADJUSTMENT

- Connect a pattern generator to the aerial input with RF signal amplitude = 1mV.
- Adjust the value of AGC start (item 6 of Service menu) so that voltage at pin 1 of the Tuner (1001) is 3.7V.

22
8.4.- WHITE D

8.4.1.- Manual cut-off

Item 8 of adjusting values should be 00 (see table 8.1), that means set is in automatic cut-off. However it is
possible that RGB do not start (black picture), due to grid 2 is not adjusted. In this case we recommend to change
to Manual cut-off (Item 8 = 01), pre-adjust grid 2 to have a good picture and change to automatic cut-off (Item 8 =
0) before continue adjusting (see warm-up detection circuit in 7.1.5)

8.4.2.- Grid 2
- Connect a white pattern generator.
- Adjust contrast at 00 and brightness at 36. (00 and 24 in the service menu because hexadecimal values are
used)
- Put parameter 1 of the service menu ADJUST VG2 = 1. An arrow will be displayed on the left upper corner.
- Adjust VG2 potentiometer (in line transformer) till the arrow will be transformed to a square.
- In a few seconds, arrow will disappear and ADJUST VG2 parameter will be come back to 00.

8.4.3.- White checking

- Connect pattern generator containing grey scale
- Adjust the set to normal operation and reduce the saturation control to minimum.
- Allow the set to warm up about 10 minutes and check visually if the grey scale has correct colour.
- If not, enter to Service menu and adjust G and B gain (items 14 and 15) until a desired grey is obtained. In the
case that adjusting is difficult, start again with the setting values of table 8.1 (items 9, 10, 13, 14 and 15).

8.5.- GEOMETRY

- Connect a circle pattern generator with the controls at nominal conditions and enter to service menu.
Adjust to have picture centred in vertical position by service menu item 16.
- Horizontal shift:
Adjust to have picture centred in horizontal position by service menu item 18.
- Vertical amplitude:
Adjust picture height to cover the screen by service menu item 19.
Adjustments only if necessary:
- TXT Shift:
Vertical and horizontal shift of OSD or TXT can be adjusted by items 3 and 4 of service menu.
- Vertical slope:
When item 17 is selected, only upper part of the screen can be seen. Vertical slope is adjusted when centre line
of the pattern is just visible.
- Vertical S correction:
S correction can be adjusted by item 20 of service menu.

8.6.- OPTIONS

8.6.1.- System options

The chassis system is described in option SYS OPTIONS of the service menu, and the following alternatives are
possible:

VALUE TDA93x1 - MULTI TDA93x0 - NOT MULTI

00H PAL BG PAL BG
01H PAL I PAL I
02H PAL SECAM BG PAL BG - I
03H PAL SECAM BG - DK PAL BG - DK
04H PAL SECAM BG - L - LP
05H PAL SECAM BG - I - L - LP
06H PAL SECAM BG - I - DK - L - LP

Table 8.2: SYSTEM OPTIONS Adjust

23
8.6.2.- Menu Options
The various types of menus are described in MENU OPTIONS, and these include the following alternatives:

MENU OPTIONS VALUE MONO STEREO

Menu 00H X X
Bars 01H X
Basic Bars (NO Scart) 02H X
Stereo Menu with double Scart 03H X
Menu only UHF 04H X X
Bars only UHF 05H X
Basic Bars only UHF (NO Scart) 06H X
Stereo Menu with double Scart only UHF 07H X

Table 8.3: MENU OPTIONS Adjust

Important note: All the chassis have identification sheet when the chassis type is indicated:
"Cod. service: SXXMXX", where SXX means the option of system and MXX means the option of menu
Example: S01M00 means: SYS OPTIONS = 01 (Pal I)
MENU OPTIONS = 00 (16 Languages menu)
When the chassis or the EEPROM (IC7685) have to be replaced, be careful to keep the same type of chassis,
setting correctly the chassis options.

If the microcontroller detects an incompatible option setting with the chassis configuration, it changes them
automatically. This case is only detected first time that the TV set is switch on, and an error message E7 is
displayed (see cap. 8.7). Options should be checked according to the identification label.

8.6.3.- Option 16:9 and adjustment of screen format 16:9 (only micros with software mask /1196 and /1227)
- Adjust parameter 21 (16:9 ENABLED) in order to activate/deactivate format option 16:9. By adjusting parameter 22
(16:9 RATIO), we modify format ratio 16:9.

16:9 ENABLED VALUE

Button 16:- not respond. Not scart levels 00H
Button 16:9 functioning and Scart levels 01H

Table 8.4: 16:9 ENABLED adjust

Picture 16:9 Zoom Conprese

V: 75%

Fig.8.1: Format 16:9 ratio adjust

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8.6.4.- Optional connectors (stereo TV sets)
Parameters 23 and 24 of the service menu allow us to configure external connections to the chassis, depending on
whether we have double euroconnectors (PAR. 23 = 01) and a lateral AV connection (PAR. 24 = 01).

8.7.- PLUG & PLAY

To exit Plug&Play:
1.- Select your language and press the Menu key (or Install).
2.- Press right arrow key to start tuning
3.- Cancel by pressing Menu key (or Install)
4.- Press Menu key (or Install) to exit the Sort Programs Menu

To enter Plug&Play:
1.- Press the Local Menu key and the Install key of your remote control continuously for 4 seconds.

8.8.- ERROR MESSAGES

The microcomputer also detects errors in circuits connected to the I²C (Inter IC) bus. These error messages are
communicated via OSD (On Screen Display):

Error message Error description Component

E1 New EEprom memory Adjust needed
E2 EEprom communication error IC 7685
E3 µC internal error (RA M) IC 7015
E4 Internal bus communication IC 7015
E5 SDA2/ SCL2 bus wrong communication IC 7701 (stereo)
No sound menu SDA2/ SCL2 bus no communication IC 7701 (stereo)
E6 EEprom data error IC 7685
E7 Not allowed options * (see 8.6) Item 21 y 22 service menu
E8 Vertical guard protection Pin 50, IC 7015

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10. Replacement parts list CTR-AA CHASSIS
10.1 Electrical

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10.2 Electromechanical CTR-AA CHASSIS

POS. DESCRIPTION CODE SAFETY

2 DEGAUSSING COIL 14” 313E 108 21641
2 DEGAUSSING COIL 21” 313E 108 67781
3 LOUDSPEAKER 3” 1.5W 25 OHMS TV 14” MONO 3130 100 60191
4 LOUDSPEAKER 50x90 3W 16 OHMS TV20/21 MONO 3130 100 20401
4 LOUDSPEAKER 50x90 3W 8 OHMS TV20/21 MONO 3130 100 60301
4 LOUDSPEAKER 58x126 6W 16 OHMS STEREO 3130 100 60931
5 REMOTE CONTROL MENU TXT 3130 108 21431
5 REMOTE CONTROL MENU NO TXT 3130 108 21441
5 REMOTE CONTROL RF25 STEREO 313W 108 21711
5 REMOTE CONTROL BARS NO TXT 3130 108 21481
6 LOOP AERIAL 3130 100 20482
7 ROOD AERIAL ANLY FOR EIRE 3130 100 20361
10.3 Mechanical, chassis and switches CTR-AA CHASSIS

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