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Sony KV-20V50 Service Manual
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Sony KV-20V50 Service Manual

Sony KV-20V50 Service Manual

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SERVICEMANUAL
Television system
American TV standards
Channel coverage
VHF: 2-13
14-69
U H F :
CABLE TV: 1-125
Picture tube
Hi-Black Trinitrona tube
20-inch picture measured diagonally
21-inch picture tube measured diagonally
Antenna
75 ohm external antenna
terminal for VHF/UHF
Input
VIDEO AND S VIDEO
S VIDEO IN (S terminal)
Video (phono jacks) :
Audio (phono jacks) :
SPECIFICATIONS
1
Vp-p, 75-ohms
unbalanced,
sync negative
C: 0.286 Vp-p (Burst signal)
1
Vp-p, 75-ohms
unbalanced, sync negative
(100%
500 mVrms
modulation)
Impedance : 47 kilo-ohms
Canadian Model
BA-1
MODELS OF THE SAME SERIES
Speaker output
Speaker size
Full range 80 mm
Audio frequency
response
Power
requirements
120 V AC, 60Hz
Power consumption 120W
Standby mode
4 w
Dimensions
(w/h/d)
550X464.7X471.3
Weight
24.0 kg (52 Ibs 15 oz)
Supplied accessories Remote Commander
with
EVEREADY batteries
Recommended
U/V mixer EAC-66
accessories
Connecting cable
Design and specifications are subject to change without notice.
US Model
Chassis No. SCC-F78F-A
Chassis No. SCC-F79E-A
CHASSIS
mm
RM-Y117 (1)
1
size AA (R6)
VMC-720M
RK-74A

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  • Page 1 SERVICEMANUAL US Model Chassis No. SCC-F78F-A Canadian Model Chassis No. SCC-F79E-A BA-1 CHASSIS MODELS OF THE SAME SERIES SPECIFICATIONS Television system American TV standards Speaker output Channel coverage VHF: 2-13 Speaker size Full range 80 mm 14-69 U H F : Audio frequency CABLE TV: 1-125 response...

  • Page 2: Table Of Contents

    I M P O R T A N C E C R I T I Q U E P O U R COMPONENTS WITH SONY PARTS WHOSE PART NUMBERS FONCTIONNEMENT. REMPLACER APPEAR AS SHOWN IN THIS MANUAL OR IN SUPPLEMENTS...
  • Page 3 SAFETY CHECK-OUT (US Model only) LEAKAGE Aftercorrectingtheoriginal safety checks before releasing the set to the customer: The AC leakage from any exposed metal part to earth ground and from all exposed metal parts to any exposed metal part having a return Check the area of your repair for unsoldered or poorly-soldered to chassis, must not exceed 0.5 mA (500 microampers).

  • Page 4: General

    GENERAL Instruction Manual remein as in the manual. 1-2. LOCATING THE CONTROLS l-l. THE SONY TRINKRON@‘COLOR For details, see Ihe pages indicated by Ihe numbered black circles 0. Channel number display Main picture input mode SLEEP, MUTING displays @I CHANNEL...
  • Page 5 V H F / U H F VIDEO 1 IN jacks antenna terminal AV input jack door AUDIO OUT jacks VIDEO 3 IN jacks also localed on the Remote Commander (pp. 9 - 11).

  • Page 6: Using The On-Screen Menus

    ON-SCREEN MENUS 1-3. USING THE The following ltow chart shows the dilferenl levels of on-screen menus that you can use to make various adjustments and settings. See Ihe indicated pages for using each feature. For picture quality adjustment - P O W E R b u t t o n ’ @ @ 6) @ MUTING button @ - Main menu Adjustment bar...

  • Page 7: Connecting Other Equipment

    14. CONNECTING OTHER EQUIPMENT For presetting and other functions C A B L E OWOFF semen (p. 17) SET UP me”” M a i n m e n u AUTO PROGRAM screen (P. 181 AUTO PROGRAM VIDEO AUDIO TIME SET UP C H A N N E L ERASEJADD screen (pp.

  • Page 8: Watching Tv Programs

    WATCHING TV PROGRAMS Press POWER on the TV or the Remote Commander lo turn the TV on. Use this lealure to set S VIDEO lo ON or OFF depending on Ihe kind 01 POWER video equipment you have connecled to the N. For inslruclions connecting video equipment, see pp.

  • Page 9: Using Convenient Features

    USING CONVENIENT FEATURES 1-6. 1-7. USING CLOSED CAPTION Press MENU. The main menu appears. Press MUTING. MUTING The display “MUTING’ wi// appear on the screen. M E N U CLOSED CAPTION To restore the sound Press MUTING again. or press VOL +. U s e : @j@ Press a+ or V-lo select CLOSED CAPTION.

  • Page 10: Adjusting Picture And Sound Quality

    l-8. ADJUSTING PICTURE AND SOUND QUALITY Press At make the adjustment. Press MENU. To restore the laclory (mid-level) selling You can adjust the picture (and sound. pp. 34-37) for each input mode Go to the VIDEO menu and press RESET. or on the All Ihe seltings excepl lor PICTURE will be Remote Commander to select the input mode before making the adjustmenls.
  • Page 11 TO res,ore ule iactory (mid-le”el) Press A+ or V-to make the adjuslmenl. Go lo tho AUDIO men” and ,,re$s RESET, The settings lor MTS and SPEAKER will no, be To relurn to Ihe “~,,,a, ecreen CLOSED CAPTION To decrease bass res,wnse bass response Press RETURN,...
  • Page 12 Turning the speaker on or off R e c e i v i n g M u l t i c h a n n e l T V S o u n d p r o g r a m s - M T S (Follow steps Use lhls feature l o Urn Ihe TV speaker off when you connect an audio (Follow steps l-2 in ‘Adjusting the Sound,”...

  • Page 13: Using The Timer-Activated Functions

    1-9. USING THE TIMER-ACTIVATED FUNCTIONS To reset the lime Press RESET while in the CURRENT TIME s c r e e n . a n d r e p e a l steps 4-i’. Follow these instructions to set the currenl time. The correct time must be set in To display Ihe lime order lo use the timer-aclivaled functions (ON/OFF TIMER, CHANNEL BLOCK).
  • Page 14 To clear the ON/OFF TIMER setttng Press A+ or lo set the day. Press RESET white in the ON/OFF TtMER Each me you press A + or V-, ,he days ol lhe week change as shown in Fig. 1. Then press RETURN.
  • Page 15 Press A+ or V-lo set the day. Use this function lo block e channel from appearing on the screen during the time you specify. You can use lhis (unction on Ihe screen. undesirable programs. BLOCKED EXAMPLE: Set CHANNEL BLOCK every Sunday al 8:45 PM for one hour. on channel 38.

  • Page 16: L-10. Customizing The Screen Display

    l-10. CUSTOMIZING THE SCREEN DISPLAY erase unneeded captions Press A+ or V- to select a caption position number. Call Iho caption setting swoon by lollowing Each lime Use this feature to caption up to 12 channel number displays with the matching on lhe sween.
  • Page 17 Use lhis leature tq label each inpul mode in order lo identify the eqUipment Use this feature to display the captions you se!, end to select e channel directory for viewing. EXAMPLE: Label VIDEO 1 IN as VHS. Press CH GUIDE. A dlrecby appears, c o r r e s p o n d i n g l o Ihs direclay k e y s o n the RemOle...

  • Page 18: L-L 1. Using The Pre-Programmed Remote Commander

    VIDEOZ: VIDEO2 With the supplied Remote Commander, you can operate a Sony video cassetla recorder (Seta. 6 mm, VHS) or a mulli disc player as well as most non-Sony video equipmenl connecled to your TV by following the steps below.
  • Page 19 2 6 . 2 9 TOSHIBA 20.21 TOTE VISION The code numbers lor Sony equipment are assigned as follows: 01 ..Bela, ED Bela VCR 02 ..tl mm V C R ..V H S VCR ..Video disc player...

  • Page 20: Troubleshooting

    1-12. TROUBLESHOOTING ..; ..Use CABLE POWER and Ihe TV c~nlrol buttons (0 - 9. ENTER, JUMP and CH +/-) lo operate the cable converter box. CABLE . Adjust BRIGHTNESS. POWER . Press VOLUME + on the Nor VOL + on the Remote Commande .

  • Page 21: Disassembly

    SECTION 2 DISASSEMBLY 2-1. REAR COVER REMOVAL 2-2. SERVICE POSITION...

  • Page 22: Picture Tube Removal

    2-3. PICTURE TUBE REMOVAL on spring Deflection s c r e w s Cushion REMOVAL OF ANODE-CAP NOTE : Short circuit the anode of the picture tube and the anode cap to the metal chassis, CRT chield or carbon painted on the CRT, after removing the anode. REMOVING PROCEDURES Using a thumb pull up the rubber cap separated from the anode button, the...

  • Page 23: Beam Landing

    SECTION 3 SET-UP ADJUSTMENTS Perform the adjustments i; order as follows: a complete realignment is required or a new 1. Beam Landing picture tube is installed. 2. Convergence Focus rated power supply voltage unless otherwise noted. 4. Screen (G 2) and White Balance Test Equipment Required.

  • Page 24: Convergence

    3-2. CONVERGENCE direction of arrow @ and @$,. red, green and blue dots Preparation: move as shown below. and V.SIZE adjustments. Set BRIGHTNESS control to minimum. (1) Horizontal and Vertical Static Convergence RV 701 Fig.5 1. Adjust HSTAT VR to converge red, green and blue If the blue dot does not converge with red and green dots the in center of the screen.(Horizontal move- dots, perform following steps.
  • Page 25 (3) Screenlcorner Convergence Purity Fig.7 Fig.9 (2)Dynamic Convergence Adjustment Affix a Permalloy ass’y corresponding Preparation: to the misconverged areas convergence Adjustment. Slightly loosen deflection yoke screw. 2. Remove deflection yoke spacers. 3. Move the deflection yoke for best convergence as shown below. 4.

  • Page 26: Focus

    T LODE 3-3. FOCUS SERVICE ADJUSTMEN Adjust FOCUS control for best picture. Item Disp. ( k e r n ) data 3. The CRT displays the item Being adjusted. 4. Press i or m on the Remote Commander to select the item.

  • Page 27: Safety Related Adjustments

    SECTION 4 SAFETY RELATED ADJUSTMENTS A BOARD A BOARD R511 CONFIRMATION METHOD (B+ HOLD- DOWN CONFIRMATION) READJUSTMENTS DOWN CONFIRMATION) READJUSTMENTS The following adjustments should always be per- The following adjustments should always be per- formed when replacing the following components formed when replacing the following components (marked with 0 on the schematic diagram).
  • Page 28 digital multimeter digital multimeter digital multimeter...

  • Page 29: Circuitadjustments

    SECTION 5 CIRCUIT ADJUSTMENTS 5-l. ELECTRICAL ADJUSTMENT BY REMOTE COMMANDER Use of Remote Commander (RM-Y117) can be 2. MEMORY WRITE CdNFlRMATlON METHOD 1. After adjustment, pull out the plug from AC performed circuit adjustments about this model. outlet, and next place, plug in AC outlet again. 2.
  • Page 30 4. AN ITEM OF ADJUSTMENTS Disp. Item 4ve. data Data range AFC Loop Gain 3 1 N O T C o - 3 HFRE H. Frequency 3 2 D R G B O - 1 2 7 O-63 Angle VFRE V.

  • Page 31: A Board Adjustments

    5-2. A BOARD ADJUSTMENTS 1. Input a color-bar signal. 2. Set to Service adjustment Mode. 1. Input a color-bar signal. 3. Set the conditions as follows. 2. Adjust AGC VR of TU 101 so that snow noise and cross-modulation disappear from the picture. PICTURE 3.
  • Page 32 NT (DISP)~ ADJUSTME 1. Input a cross-hatch signal. 1. Input a color-bar signal. 2. Set to service adjustment Mode. 2. Set to service adjustment Mode. 3. Select VSIZ withIandi. 3. Select DISP withiandm. 4. Adjust withmandmfor the best vertical size. 4.
  • Page 33 ADJUSTMENT (H POS)J Note: Perform this adjustment after H.FREQUENCY ADJUSTMENT (HFRE) . 1. Input a cross-hatch signal. 2. Set the Service adjustment mode. 3. Select HPOS withO andH . 4. Adjust withHandmto the best horizontal center. 5. Write into the memory by pressing IMUTING] then H.
  • Page 34 MEMO...

  • Page 36: Circuit Boards Location

    RM-Y117 6-2. CIRCUIT BOARDS LOCATfON Adjustment ( Part replaced ( 0 ) B+ HOLD-DOWN C523, C524, R534, D BOARD HOLD-DOWN (R537) G BOARD All voltages are in V. Voltage are dc with respect to ground unless otherwise noted Readings are taken with a IO MO digital multimeter. Readings are taken with a color-bar signaLinput.

  • Page 40: G Board

    [POWER SUPPLY, CIRCUIT] - G Board - B - 3 T R A N S I S T O R Q602 Q603 Q604 Q606 Q607 D I O D E D604 D605 D607 G - l D606 G - l D609 E - l D610...

  • Page 41: Ua Board

    3 INI WHT-L : S - M I C R O TO A SOARD CN402 TO A BOARB [AV TERMINAL]...

  • Page 44: C Board

    [R.G.B. OUT] NOTE: The circuit indicated as left contains high voltage of over 600 Vp-p. Care must be paid to prevent an electric shock in inspection or repairing.

  • Page 45: Semiconductors

    6-4. SEMICONDUCTORS CXA 1465AS PM-35 LA7830 1 T33 MC781 2CT MM1 114XFF GPO80 RGP 1 OGPKG3 RGP 1 SGPKG23...

  • Page 46: Exploded Views

    7-685-663-79 (BLACK) : BVTP4 x 1 8 Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark 4-394-072-01 EMBLEM (NO. 8). SONY 4-384-096-01 SCREW (4X16), TAPPING, +P l-504-304-11 SPEAKER (KM) 4-039-851-01 TERMINAL BOARD, ANTENNA 4-040-348-01 LABEL, TERMINAL l-573-657-11...

  • Page 47: Picture Tube

    7-2. PICTURE TUBE shading and $$ ,..I. _ . . - -,,.,, ......Ref. No. Part No. Description Remark [ Ref.

  • Page 48: Electrical Parts List

    SECTION 8 ELECTRICAL PARTS LIST When indicating parts by reference are seldom required for routine service. Some number, please include the board name. The components identified by in this manual specified. All variable and adjustable resistors have . . . ~ . : . : < . ; : z : . : : : z : ; : ; : . : . : l , .
  • Page 49 only with part number 9 ........
  • Page 50 Ref. No. Part No. Description Remark Description Remark *l-564-505-11 PLUG, CONNECTOR 2P CN202 *l-564-505-11 PLUG, CONNECTOR 2P CN203 *l-560-123-00 PLUG, CONNECTOR (2.5MM) 3P CN301 *l-564-509-11 PLUG, CONNECTOR 6P CN402 *l-564-509-11 PLUG, CONNECTOR 6P IC TDA8424 CN501 *l-580-798-11 CONNECTOR PIN (DY) 6P CN651 *l-691-135-11 PIN, CONNECTOR (PC BOARD) 4P I C L A 7 8 3 0 CN652 *l-564-510-11 PLUG, CONNECTOR 7P...
  • Page 51 ..................:I :* *: * ........Part No. Description Remark Description Remark Ref. No. R045 l-216-065-00 METAL CHIP 8-729-422-27 TRANSISTOR 2SD601A-Q 8-729-422-36 T R A N S I S T O R R046 l-216-065-00 METAL CHIP 2SB709A-Q 8-729-422-36...
  • Page 52 only with part number $$ .$ Ne les remplacer que par une 8 ... ~~. . ~ ~. : . : ~~~. ~ . : ::::::~::~:::::::::::. ~ ~~~~:, , ~ ~~~~;::~~; .
  • Page 53 . The mm ponents identified by E in this ~~~~:“~~~~~~~~~:~~~~~~~~~:~~~:~~~~~~~~~ manual have been carefully g Les composants identifies par @ #The components identified by ;z factory-selected for each set in order to $2 une trame et une marque m $j g shading and mark A are critical g satisfy regulations regarding...
  • Page 54 identifies par 2 ......: : . : . : . : . : . : . : . : . : . , , , , , . : . . . : . Description Remark ef.No.
  • Page 55 only with part number z ..: . : . : . : ~ . : . . . : ~ : . : . : . : . : . : . : . : ~ : ~ . . : . : . : . : . : . : . : . : . : . : . : . : . : . : . : . : . : . : . : . : . : . : .
  • Page 56 identifies par 1 . 2 . Ref. No. Part No. Description Remark Description Remark 1-249-421-11 CARBON R648 R649 1-249-417-11 CARBON D800 8-719-911-19 DIODE lSS119 1-249-417-11 CARBON R650 R651 1-249-425-11 CARBON R652 1-249-411-11 CARBON 330 5% R653 1-249-417-11 CARBON R654 1-249-414-11 CARBON 5 6 0 1-249-411-11...
  • Page 57 MAGNET, ROTATABLE DISK: 15MM$ l-452-277-00 MAGNET. BMC 3-756-904-21 MANUAL INSTRACTION (ENGLISH) FREN 3-756-904-41 MANUAL INSTRACTION (SPANISH) CUSHION (UPPER) (ASSY) CUSHION (L0WER) 4-380-340-01 BAG, PROTECTION l-467-060-11 REMOTE COMMANDER (RM-Y117) g-903-826-01 COVER BATTERY (RM-Y117) English Sony Corporation TV Group Printed in Japan...

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