Service Manuals, User Guides, Schematic Diagrams or docs for : BEKO TV BEKO chassis CNT-BB BEKO chassis CNT-BB

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BEKO chassis CNT-BB


>> Download BEKO chassis CNT-BB documenatation <<

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                     ANNEX 2 TO
                  SERVICE MANUAL
                             CTN-BB




This supplement refers to change of Microprocessor for Circuit Reference 7600.
               Chassis type is changed from CTN to CTN-BB.
Contents                           Page

Introduction                        2

Circuit Diagrams                    3-6

Print board layout                  7-8

Circuit Description

     Small signal processing        9 - 10

     RBG Amplifiers                 11

     Sound Circuit                  11

     Power Supply                   12 - 13

     Deflection                     14

     Microcontroller/Text           14 - 15

Service components                  16 - 17 - 18




Introduction

The main change on this Chassis to the previous CTN-AA type are the introduction of
new Microprocessors for both - Text and Non Text Models.

Also the Flyback Transformer for 20 ONLY MODELS has been changed.

The relevant Circuit Diagrams and PCB Layouts have been amended to show these
changes, plus minor corrections/updates have been made to all other circuit information
where this has been found necessary.

Page 16, 17 and 18 shows different Part Numbers for the Component changes on the
new chassis.

Please use the original CTN Service Manual for all other parts information.




                                              2
    1001   F7   3284   M4
    1015   C4   3285   M4
    1032   E3   3286   M5
    1033   E4   3289   M5
    1272   I5   3290   K5
    2001   G6   3291   K5
    2002   H7   3292   K5
    2003   F6   3340   B8
    2005   G8   3341   B8
    2006   G8   3342   B9
    2007   F2   3345   D7
    2010   B4   3350   C7
    2011   B4   3351   A7
    2013   B4   3353   B7
    2014   A3   3354   B7
    2015   F5   3370   D7
    2016   F5   3371   D8
    2017   B5   3372   D8
    2018   C5   3841   J7
    2019   G1   3843   J7
    2022   D6   3845   K7
    2025   D5   3848   L7
    2030   E2   3850   I8
    2034   E4   3851   I7
    2037   E2   3852   J8
    2041   B2   3853   J7
    2043   B2   3854   I8
    2044   A2   3855   K7
    2045   D2   3858   L7
    2050   G3   3860   I7
    2053   E4   3862   L7
    2080   G5   3865   L7
    2082   G5   3871   M8
    2084   G5   3875   L8
    2261   J5   3876   M8
    2262   J5   3879   J8
    2265   I5   3880   J9
    2267   I3   3881   J8
    2268   I3   3882   K8
    2271   I1   3883   K8
    2272   J2   3884   M7
    2273   J2   5001   F6
    2274   K1   5010   B5
    2275   L1   5012   B3
    2279   L3   5015   G2
    2280   L3   5032   E3
    2284   M4   5040   C2
    2285   M4   5043   B2
    2286   M5   6001   F6
    2291   K6   6014   A3
    2292   K6   6020   B5
    2293   K6   6042   B2
    2297   H1   6275   L1
    2340   B9   6289   L5
    2350   A8   6372   D8
    2351   A7   6849   L7
    2354   A7   7001   F6
    2366   B9   7015   D4
    2370   C7   7016   F1
    2371   C7   7030   E2
    2850   I8   7250   H2
    2852   I8   7271   K1
    2856   I9   7875   M8
    2860   H7   7876   J9
    2876   M8   7877   K8
    3000   F8   9001   G8
    3001   E6   9002   H7
    3002   E7   9003   F6
    3003   E7   9004   E6
    3004   E8   9005   F6
    3005   F7   9012   A4
    3006   E9   9015   G9
    3007   F9   9016   G2
    3008   F9   9017   D7
    3010   B4   9020   G3
    3011   B3   9021   G3
    3012   B4   9034   F2
    3013   E6   9035   M8
    3017   C5   9043   A2
    3018   C5   9051   E5
    3019   B5   9080   G6
    3020   C4   9115   A4
    3021   E5   9124   G2
    3022   E5   9261   M3
    3023   E6   9262   K6
    3026   E8   9265   G2
    3029   E3   9271   J3
    3030   E2   9289   M5
    3031   E3   9331   D7
    3032   E3   9354   M1
    3033   F4   9366   A8
    3043   B2   9367   C8
    3044   A2   9370   C7
    3045   D2   9371   C7
    3049   B3   9372   D8
    3051   E5   9600   F6
    3260   I5   9810   L8
    3261   M3   9812   K9
    3262   J5   1M7    M5
    3272   J1   2M7    M4
    3273   J1   3M7    M4
    3275   L1   4M7    M3
    3280   H3   5M7    M3



3
    42     L1   3216   D6
    1135   L8   3217   D6
    1136   L8   3218   C7
    1137   J7   3219   D6
    1990   D3   3220   D5
    2101   I8   3221   D6
    2109   J1   3222   E6
    2112   K6   3224   E7
    2117   K8   3225   E7
    2124   I6   3226   F7
    2125   I6   3227   E7
    2126   J7   3228   E6
    2127   J6   3229   E6
    2128   J6   3230   F6
    2143   L8   3232   D7
    2152   M6   3233   F6
    2155   M6   3234   F5
    2156   H2   3236   E4
    2169   L8   3237   E4
    2170   M8   3244   F6
    2180   M7   5101   I7
    2184   L4   5235   E4
    2185   L4   6115   I8
    2187   K3   6116   J8
    2188   K3   6170   L8
    2189   M4   6205   B6
    2191   L2   6218   D6
    2192   L2   6227   E6
    2202   B7   7015   L7
    2204   C6   7114   J2
    2206   F5   7115   J1
    2217   D6   7125   I7
    2230   F6   7126   J8
    2237   F4   7127   J8
    3111   J2   7140   J3
    3112   J2   7170   M8
    3114   J2   7187   L4
    3115   J2   7205   B6
    3117   J8   7210   B7
    3118   I8   7211   D7
    3119   I8   7212   E7
    3120   J8   7218   D6
    3121   J8   7225   F7
    3124   H6   7227   E6
    3125   J5   9110   J4
    3126   J5   9111   J2
    3143   L8   9112   J1
    3144   L7   9114   K6
    3151   L7   9125   J5
    3152   M6   9143   L5
    3155   H4   9156   I2
    3156   I4   9157   I3
    3170   M8   9183   L4
    3171   M8   9190   L3
    3173   L8   9191   L3
    3184   L5   9191   M2
    3185   L5   9192   J3
    3189   K4   9201   E7
    3191   K2   9202   C7
    3194   L2   1L1    C8
    3202   B6   1L2    F5
    3203   B6   1M3    M2
    3204   C6   2L1    D8
    3205   B7   2L2    F4
    3206   C6   2M3    L2
    3207   C5   3L1    D8
    3208   C6   3L2    F4
    3210   C7   3M3    L2
    3211   D7   4L1    B8
    3212   E7   4L2    F4
    3213   B7   5L1    B8
    3214   D7   L3     F3
    3215   D6   L4     C4


4
    22     B3   3509   B5
    47     J2   3510   D5
    47     J4   3512   D4
    49     C3   3513   D4
    1500   A2   3516   E3
    2401   I1   3517   D5
    2402   J2   3518   D5
    2404   K2   3519   B4
    2405   L2   3520   B4
    2414   H2   3521   E5
    2415   I2   3523   D4
    2416   J2   3524   B4
    2440   H5   3525   B4
    2442   I5   3527   E5
    2443   L5   3528   E4
    2444   H5   3540   F5
    2445   J5   3570   F4
    2446   K5   3571   F4
    2448   J3   3573   G4
    2449   J3   3574   F4
    2450   I4   3576   F5
    2451   I4   3577   F5
    2453   L6   5441   I5
    2458   J3   5443   K5
    2460   L4   5445   K3
    2463   L5   5447   J3
    2470   I3   5449   K5
    2500   B3   5480   I4
    2502   D3   5500   C3
    2504   D3   5525   E3
    2505   D4   5532   F5
    2506   B6   5534   F3
    2508   E5   5540   F5
    2509   B4   5541   F6
    2510   D5   5550   D6
    2511   D5   5552   E4
    2514   D6   6416   I2
    2515   D5   6417   H2
    2516   D3   6440   H6
    2520   D5   6443   L5
    2523   B5   6447   J5
    2524   E4   6449   L6
    2530   F3   6451   I4
    2532   F5   6470   J3
    2534   F2   6502   D3
    2540   F6   6503   D3
    2561   G4   6504   D3
    2562   G4   6505   D3
    3235   J5   6515   D5
    3238   J5   6516   E3
    3400   K1   6521   D6
    3401   K2   6530   F3
    3402   J1   6540   F5
    3403   K2   6570   F4
    3404   L2   6571   F4
    3405   L2   7400   H2
    3406   L2   7440   H5
    3407   L2   7445   J5
    3408   H2   7514   C4
    3410   L2   7525   E4
    3411   L2   7571   F5
    3412   K2   7575   F4
    3415   J2   9400   J2
    3416   J2   9460   L4
    3440   H5   9480   I4
    3441   H6   9506   E6
    3442   I6   9523   D4
    3444   H5   9524   C5
    3445   I5   9560   G5
    3448   K5   9561   G6
    3449   K5   1M1    A3
    3451   I4   1M2    C2
    3455   H4   1M5    J4
    3456   H4   1M6    I3
    3457   J3   2M1    A2
    3460   L4   2M2    C2
    3470   J3   2M6    J5
    3480   I4   3M6    J5
    3501   C3   4M5    J4
    3504   A3   4M6    L4
    3507   B5   5M5    K2
    3508   D5   6M5    J2




5
            B3    3657   C6
    1679    C12   3658   G12
    24B-24C B5    3659   G13
    25B-26 B4     3660   C3
    25C-26 B5     3661   C7
    2602    G2    3662   C4
    2610    G2    3663   C3
    2611    H2    3664   B9
    2622    G7    3665   B9
    2623    H6    3667   C9
    2624    H6    3668   B10
    2629    H6    3669   B10
    2630    H5    3670   C9
    2635    C11   3671   C6
    2636    C11   3672   B8
    2641    F12   3673   B7
    2648    C10   3674   B8
    2651    F2    3675   C3
    2656    H9    3676   C2
    2659    G12   3680   H7
    2660    C3    3681   C8
    2669    B10   3682   F7
    2677    E2    3684   G7
    2680    C11   3685   G7
    2681    C12   3686   H3
    2685    C3    3687   H3
    2691    D2    3688   H3
    2692    G9    3689   H3
    3600    C5    3690   C5
    3601    H2    3691   F1
    3602    H2    3692   F3
    3603    G2    3693   G3
    3604    G2    3694   C4
    3605    G2    3695   C6
    3606    F2    3696   C6
    3607    F2    3697   C4
    3608    F8    3698   G9
    3609    G4    3699   C5
    3610    G2    6602   G2
    3611    H2    6616   H5
    3612    H2    6641   H11
    3613    H6    6642   H11
    3614    F5    6644   H12
    3615    H5    6663   B3
    3616    F5    6691   E2
    3617    H5    7600   D2
    3618    G4    7601   F7
    3619    F5    7605   F2
    3620    F5    7638   G11
    3621    F7    7640   G11
    3622    F7    7641   G11
    3623    G6    7642   G11
    3624    G6    7644   G12
    3625    F6    7651   G10
    3626    G6    7665   C9
    3627    G6    7670   C10
    3628    F6    7672   B8
    3629    G5    7673   B7
    3630    F3    7685   H8
    3631    F3    7686   G3
    3632    G5    7691   E1
    3633    H6    9052   B8
    3636    B10   9148   B7
    3637    B11   9266   B11
    3638    H11   9609   H4
    3639    F11   9610   F1
    3640    G10   9611   A13
    3641    G11   9614   G5
    3642    G11   9616   F7
    3643    F11   9618   A14
    3644    G12   9650   H10
    3645    F11   9651   F4
    3646    D1    9652   G4
    3647    G10   9653   A13
    3648    C10   9658   G4
    3649    F12   9663   C3
    3650    C6    9665   B3
    3651    F4    9670   C10
    3652    F10   9671   C9
    3653    F10   9678   F1
    3654    G9    9679   C1
    3655    G9    9686   G3
    3656    H9    9692   F9




6
      BOARD LAY
PRINT BOARD LAYOUT




                     7
PRINT BOARD LAYOUT
      BOARD LAY




                     8
CIRCUIT DESCRIPTION
1.- SMALL SIGNAL PROCESSING (Diagram A)

The small signal is processed by TDA8361, (TDA8360 no scart) for Pal sets and TDA8362 for Pal/Secam
sets (IC 7015), including IF detection, video processing, chroma decoder, RGB processing, sync processor
and FM sound decoder.

1.1- IF detection (IC7015/6A)

- IF input (pins 45,46) The IF signal comes from pin 11 of the tuner to the IF SAW (Surface Acoustic Wave)
                  45,46):
filter (1015) and the IF-detector IC7015/6A (pins 45 and 46).
- IF filter (1015): The IF bandpass characteristic, determined by the SAW filter, is 33.4 to 38.9 MHz. for BG
sets, 33.5 to 39.5 MHz. for PAL I sets and 32.4 to 38.9 MHz. for DK sets.
- IF oscillator (pins 2,3) Carrier frequency, present in coil L5040, is tuned at 38.9 MHz. for BG sets or
                        2,3):
39.5 MHz for Pal I sets
- AGC voltage (pin 47): The AGC delayed voltage is applied to pin 1 of the tuner. It should be adjusted
   AGC voltage
for 1mV. antenna signal by means of R3021 (pin 49).
- AFC signal (pin 44): The Automatic Frequency Control is obtained from the reference signal of the IF-
detector. C2037 smoothes the AFC voltage.
- Identification (pin 4) The identification output is applied to pin 16 of the 



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