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  • SERVICE MANUAL Colour Television

    Product Code: 13007604 13007605

    Original Version

    Chassis Series: LA6-A

    BC2E

    FILE NO.

    Model No. C21LF41 C21LF41B

    Service Ref. No. C21LF41-00 C21LF41B-00

    (Argentina)

    Give complete SERVICE REF. NO. for parts order or servicing. It is shown on the rating plate at the cabinet back of the unit.

    This T.V. receiver will not work properly in foreign countries where the television trans-mission system and power source differ from the design specifications. Refer to the speci-fication table.

    SpecificationsPower Source . . . . . . . . . AC220V, 50Hz / 60HzReceiving System . . . . . . PAL (M/M, N/N), NTSC (M/M)Channel Coverage

    Antenna mode VHF: CH02-CH13, UHF: CH14-CH69CATV mode VHF band: CH01-CH13, Mid band: CH14-CH22

    Super band: CH23-CH36, Hyper band: CH37-CH64Ultra band: CH65-CH94 and CH100-CH125Low mid band: CH95-CH99

    Aerial Input Impedance . . 75Input Terminals AV1 (Video): Phono jack 1 AV1 (Audio): Phono jack (R/L) 1 set AV2 (Video): Phono jack 1 AV2 (Audio): Phono jack (R/L) 1 set Output Terminals Video Monitor Output: Phono jack 1 Audio Monitor Output: Phono jack (R/L) 1 Headphone Jack: Mini stereo jack 1Sound Output (RMS) . . . . 3W + 3WSpeakers . . . . . . . . . . . 5cm x 9cm x 2 pcs.Dimensions . . . . . . . . . 596(W) X 493(H) X462(D) mm Weight . . . . . . . . . . . . . approx. 22 Kg

    Specifications subject to change without notice.

    JXMRRPOWER

  • Contents

    -2-

    Safety Notice . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2Chassis Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4IC Block Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-7Service Adjustments. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-17Purity and Convergence Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18Cabinet Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19Chassis Electrical Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-26

    Safety Notice

    SAFETY PRECAUTIONS

    1: An isolation transformer should be connected in the power line between the receiver and the AC line when a service is performed on the primary of the converter transformer of the set.

    2: Comply with all caution and safety-related notes provided on the cabinet back, inside the cabinet, on the chassis or the picture tube.

    3: When replacing a chassis in the cabinet, always be certain that all the protective devices are installed properly, such as, control knobs, adjust-ment covers or shields, barriers, isolation resistor-capacitor networks etc.. Before returning any television to the customer, the service techni-cian must be sure that it is completely safe to operate without danger of electrical shock.

    X-RADIATION PRECAUTION

    The primary source of X-RADIATION in television receiver is the picture tube. The picture tube is specially con-structed to limit X-RADIATION emissions. For continued X-RADIATION protection, the replacement tube must be the same type as the original including suffix letter. Excessive high voltage may produce potentially hazard-ous X - RADIATION. To avoid such hazards, the high voltage must be maintained within specified limit. Refer to this service manual, high voltage adjustment for specific high voltage limit. If high voltage exceeds specified limits, take necessary corrective action. Carefully follow the instructions for + B1 volt power supply adjustment, and high voltage check to maintain the high voltage within the specified limits.

    PRODUCT SAFETY NOTICEProduct safety should be considered when a component replacement is made in any area of a receiver. Components indicated by mark in the parts list and the schematic diagram designate components in which safety can be of special significance. It is particularly recommended that only parts designated on the parts list in this manual be used for component replacement designated by mark . No deviations from resistance wattage or voltage ratings may be made for replacement items designated by mark .

  • Chassis Block Diagrams

    -3-

    AE

    RIA

    L

    KE

    Y S

    WR

    /G/B

    CR

    T39

    12R

    CR

    T D

    RIV

    E

    2613

    G+

    180V14

    BH

    V/F

    o/Sc

    R/C

    PR

    E-A

    MP

    TU

    NE

    RB

    US

    21H

    -OU

    TD

    Y-H

    (LA76931A

    IFV-

    YD

    ) 33 9

    67AL

    ro

    HO

    RIZ

    -DR

    IVE

    HO

    RIZ

    -OU

    TS

    AW

    FILT

    ER

    44F

    BT

    PU

    LSE

    AV

    146

    SU

    SO

    C

    AV

    254

    VID

    EO

    SW

    -AU

    DIO

    SW

    17V

    -OU

    T(LA

    78041M

    ON

    ITO

    R O

    UT

    VID

    EO

    52F.B

    ./ LA

    78040)M

    ON

    ITO

    R O

    UT

    AU

    DIO

    VE

    RT-O

    UT

    BU

    S

    5F

    MN

    VM

    AC

    220V(S

    AN

    KE

    N)

    AU

    DIO

    SP

    EA

    K(L)

    L/RL

    (CX

    A2234Q

    P)

    WF

    (LA42032

    R/LA

    42031)S

    PE

    AK

    (R)

    PO

    WE

    RA

    UD

    IO-O

    UT

    63/64

    ST

    R-W

    6754/S

    TR

    -W6753

    38/39

    +9V

    A(A

    UD

    IO)

    +9V

    A

    MAIN SIGNAL PROCESSING CIRCUIT

  • Chassis Block Diagrams

    -4-

    POWER SUPPLY IC (STRW6753)

    FUNCTIONAL B

    LOCK D

    IAGRA

    M

  • IC Block Diagrams

    -5-

    IC201 < IF/Video/Chroma/Def./CPU > LA76931

  • IC Block Diagrams

    -6-

    S ample appl ication cir cuits

    S ample appl ication cir cuits2

    L A78040B /040/041/045

    Vref

    +Vcc

    IN

    1 2 3 4 5 6 7

    L A78040B /040/041/045

    Vref

    +Vcc

    IN

    1 2 3 4 5 6 7

    -V cc

    1 2 3 4 5 6 7GND

    Ver.O

    UTPUT

    OUTPUTSTAGEVcc

    NON

    INV.IN

    PUT

    INVERTIN

    GIN

    PUT

    Vcc

    PUMPUPOUT

    P umpUp

    +

    -

    AMP

    ThermalP rotection

    L A78040B /040/041/045

    5V

    +Vcc(24V)

    IN

    1 2 3 4 5 6 7

    10K 33K

    10K

    11K

    4.7u

    1000

    u1.0

    330

    1 .0

    0.1u

    100u

    100u 10

    K

    10K

    1u

    IC501 LA78040

    ! 7]\X]\IUXTQNQMZ

    7]\X]\IUXTQNQMZ

    1VX]\IUXTQNQMZ

    1VX]\IUXTQNQMZ

    >KKOZW]VL[PWZ\QVOXZW\MK\QWVKQZK]Q\4WIL[PWZ\QVOXZW\MK\QWVKQZK]Q\

  • IC Block Diagrams

    -7-

    IC3401 CXA2234QP

  • -8-

    Service Adjustments

    MENU t

    CH s - VOLUME +

    VIDEO L-AUDIO-R

    MENU

    MENU

    S1.11100101 S2.11111000 ADDRESS DATA 02 H-PHA 08

    Item No. Item Data value

    GeneralThis set has an On-screen Service Menu system included in the CPU that allows remote operation for most of the service adjustments.

    2. Service Adjustments: Press the CHANNEL UP or CHANNEL DOWN button on the remote control handset to select the desired service menu item you want to adjust. Use the VOLUME + or - to adjust the data. The + or - button will increase or decrease the data sequentially.

    3. Exit from the Service Menu Press the MENU button to turn off the Service Menu display. The data which is set in the service mode is stored into the memory IC automatically.

    [ Service Mode Display ]

    Service Adjustment-11. Enter the Service Menu While pressing the MENU button on the television, press the Number Key 2 on the remote control unit. The Service Menu now appear.

    IC802 (EEPROM) ReplacementWhen IC802 (EEPROM) is replaced, IC801 (CPU) will automatically write the initial reference data into IC802 for basic TV operation. However, the bus data should be checked and some bus data should be set up before attempting the service adjustments. (See pages 9 ~ 10 for detailed information.)

    JXMRR

    JXMRR

    VOLUME +VOLUME -

    CHANNEL UP

    CHANNEL DOWN

  • -9-

    Service AdjustmentsOn-screen Service MenuFollowing table shows the initial values which have been stored in the CPU ROM, and items for the service adjustments.When IC802 (EEPROM) is replaced, check the bus data to confirm they are the same as below. The shaded menu should be checked and be set up or readjusted according to the procedures described in the following pages.Initial Setup Data marked with an * should be changed from Initial Value Data.

    No Item Initial value Range Description1 RFAGC 13 00~63 RF AGC adjustment2 H-PHA 12 00~31 H-PHASE adjustment(50Hz)3 V-DC 28 00~63 V-POSITION adjustment(50Hz)4 V-SIZ 79 00~127 V-SIZE adjustment(50Hz)5 V-SCO 18 00~31 Vertical-S compensation(50Hz)6 V-LIN 15 00~31 Vertical linearity adjustment(50Hz)7 H-P60 +3 -16~+15 Difference value of H-PHASE adjustment(60Hz)8 V-P60 0 -32~+31 Difference value of V-POSITION adjustment(60Hz)9 V-S60 0 -64~+63 Difference value of V-SIZE adj