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Sanyo DS24424 Service Manual

Remote control color tv
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SERVICE MANUAL

Contents
Safety Instructions . . . . . . . . . . . . . . . . . . 2
Service Adjustments . . . . . . . . . . . . . 3 - 10
Service Hints . . . . . . . . . . . . . . . . . . . . . . 11
Purity and Convergence . . . . . . . . . 12 - 13
Mechanical Disassemblies. . . . . . . . . . . 14
Chassis Electrical Parts List . . . . . . 15 - 22
Cabinet Parts List . . . . . . . . . . . . . . . . . . 23
Locations . . . . . . . . . . . . . . . . . . . 24 - 27
Schematic Insert . . . . . . . . . . . . . . . 29 - 36
Schematic Notes . . . . . . . . . . . . . . . . . 29
Pin Layouts . . . . . . . . . . . . . . . . . . . . . 29
Block Diagram . . . . . . . . . . . . . . . 30 - 31
Voltage Charts . . . . . . . . . . . . . . . 30 - 32
Waveforms. . . . . . . . . . . . . . . . . . . . . . 32
Schematic Diagrams . . . . . . . . . . 33 - 36
DS24424, H2BAM, PRODUCT CODE 111370380
Remote Control Color
Television

Specifications

Power Rating . . . . . . . . . . . . . . . . . . . . . 120V, 60Hz
Antenna Input Impedance . . . . . . . . . . . . . . . . . 75Ω
Receiving Channel . . . . . . . . . . . . . . . . 2 - 13 (VHF),
Remote Ready . . . . . . . . . . 33 Key Remote Control
Sound Output . . . . . . . . . . . . . . . . . . . . . . 1.0 W/CH
Intermediate Frequency
Picture IF Carrier . . . . . . . . . . . . . . . . . . 45.75MHz
Sound IF Carrier . . . . . . . . . . . . . . . . . . 41.25MHz
Color Sub Carrier . . . . . . . . . . . . . . . . . 42.17MHz
Picture Tube . . . . . . . . . . . . . . . . . A59QDF891X(ST)
Semiconductors
Integrated Circuits. . . . . . . . . . . . . . . . . . . . . . . . 8
Transistors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Cabinet Dimensions
Width . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 677mm
Height . . . . . . . . . . . . . . . . . . . . . . . . . . . . 524mm
Depth . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 480mm
FILE NO.
DS24424
(U.S.A.)
(CANADA)
ORIGINAL VERSION
Chassis No. 24424-00
NOTE: Match the Chassis No. on
the unit's back cover with
the Chassis No. in the
Service Manual.
If the Original Version
Service Manual Chassis
No. does not match the
unit's, additional Service
Literature is required. You
must refer to "Notices" to the
Original Service Manual
prior to servicing the unit.
78W (Avg), 2.0A (Max)
UHF/VHF/CATV
14 - 69 (UHF),
01, 14-94, 95-125 (CATV)
Except within Tuner and RC Pre-Amp.
REFERENCE No.
SM
780092

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  Summary of Contents for Sanyo DS24424

  • Page 1: Table Of Contents

    Height ......524mm Depth ......480mm DS24424, H2BAM, PRODUCT CODE 111370380 REFERENCE No.
  • Page 2: Safety Instructions

    SAFETY INSTRUCTIONS SAFETY PRECAUTIONS WARNING: The chassis of this receiver has a floating READING SHOULD NOT EXCEED 750 mV. AC VOLTMETER ground with the potential of one half the AC line voltage in (5000 ohms per volt or more sensitivity) respect to earth ground.
  • Page 3: Service Adjustments

    SERVICE ADJUSTMENTS GENERAL This set has an on-screen Service Menu system included in the CPU that allows remote operation for most of the service adjustments. To enter the Service Menu, first disconnect the AC power cord. Then while pressing the MENU key on the front control panel, recon- nect the AC power cord.
  • Page 4 SERVICE ADJUSTMENTS (Cont.) INITIAL BUS DATA SETUP (Cont.) 18. Select NO. 67 VMD6VMG3SSN (VM Delay / VM Gain / Sync Sep Sens) with key. Adjust the data with number keys for 22. 19. Select NO. 69 EWD (E/W DC) with key.
  • Page 5 Table 1. ON-SCREEN SERVICE MENU 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 Reference Data.
  • Page 6 SERVICE ADJUSTMENTS (Cont.) Table 1. ON-SCREEN SERVICE MENU (Continued) INITIAL REFERENCE INITIAL SETUP INITIAL SETUP TITLE FUNCTION DATA HEX DATA HEX DATA BINARY ECB4ECT 01010100 E/W Corner Bottom(7~4) E/W Corner Top (3~0) EWS7ETS3HSC 10000100 E/W Correction Sw(7) E/W Test (5~3) H Size Comp (2~0) Not Used ↓...
  • Page 7 DRIVE AND BIAS ADJUSTMENTS PROGRAM CODES The microprossesor used in this model is a multi-purpose Note 1. type and is used in several different models. To ensure Red/Blue Drive Adjustments in Service Menu NO. A8 DRV: proper operation and the correct features for your particu- Adjust Red and Blue Drive Levels alternately with 1, 3, 7, lar model, the program codes must be correct.
  • Page 8: Antenna Connections

    SERVICE ADJUSTMENTS (Continued) ANTENNA CONNECTIONS VERTICAL CENTERING ADJUSTMENT This receiver is designed for UHF/VHF reception. A 75 ohm 1. Tune receiver to an active channel. terminal is provided for UHF and VHF receptions. When 2. Check that picture is in the center of TV screen. If picture connecting a CATV antenna system, connect the 75 ohm center is too low, change resistor R513 from 1K ohm 1W to coaxial cable directly to the 75 ohm terminal.
  • Page 9: Focus Adjustment

    GRAYSCALE ADJUSTMENT FOCUS ADJUSTMENT 1. Set the picture controls to the Auto levels or Reset (use Adjust focus control (T402) for well defined scanning lines. MENU key and key or RESET key). HIGH VOLTAGE CHECK 2. Turn off the receiver and disconnect the AC power cord (120V AC line).
  • Page 10: Input Level Adjustment

    SERVICE ADJUSTMENTS (Continued) HIGH VOLTAGE HOLD-DOWN TEST SEPARATION ADJUSTMENT 7. Turn off the receiver and disconnect the AC power cord Every time the receiver is serviced, the HIGH VOLTAGE (AC 120V line). HOLD-DOWN circuit must be tested for proper operation by following these steps: 8.
  • Page 11: Service Hints

    SERVICE HINTS POWER FAILURE DETECTOR This unit is equipped with a Power Failure Detector function included in the CPU which checks for an abnormal condition in the chassis power supplies, including the power supply derived from the Horizontal Output Transformer. If, while the power is on, a failure is caused by any of the following that results in a low voltage supply, the CPU will turn the unit off in 1.5 seconds to prevent further damage: •...
  • Page 12: Purity And Convergence

    PURITY AND CONVERGENCE ADJUSTMENTS CAUTION: The Purity and Convergence adjustments have been made at the factory. Readjustments should be made only after the picture tube or deflection yoke is replaced. Follow the steps below for necessary readjustments. PURITY ADJUSTMENTS 1. When replacing picture tube or deflection yoke, mount deflection yoke and purity and convergence magnets DEFLECTION YOKE assembly properly.
  • Page 13: Convergence Adjustment

    CONVERGENCE ADJUSTMENT CENTER CONVERGENCE ADJUSTMENT OUTER AREA CONVERGENCE ADJUSTMENT 1. Connect a crosshatch generator to antenna terminals. The outer area convergence is performed by positioning of 2. Set Contrast to low level to eliminate blooming. Reduce the yoke as follows: Brightness level to obtain black background if necessary.
  • Page 14: Mechanical Disassemblies

    MECHANICAL DISASSEMBLIES CHASSIS REMOVAL CABINET BACK REMOVAL 1. Remove cabinet back. 1. Refer to Figure 1, remove 8 screws. 2. Discharge the picture tube anode (2nd anode lead) to the 2. Pull off cabinet back and remove. dag coating (picture tube grounding lead). 3.
  • Page 15: Chassis Electrical Parts List

    CHASSIS ELECTRICAL PARTS LIST CAUTION: To Protect against electrical shock and for continued product safety, refer to SAFETY PRECAUTIONS, X-RADIATION PRECAUTIONS, HIGH VOLTAGE HOLD-DOWN TEST, and PRODUCT SAFETY NOTICE on Page 2. PRODUCT SAFETY NOTICE PRODUCT SAFETY SHOULD BE CONSIDERED WHEN A REPLACEMENT IS MADE IN ANY AREA OF A RECEIVER. COMPONENTS INDICATED BY A STAR ( ) IN THIS PARTS LIST AND THE SCHEMATIC DIAGRAM DESIGNATE COMPONENTS IN WHICH SAFETY CAN BE OF SPECIAL SIGNIFICANCE.
  • Page 16 Schematic Schematic Part No. Part No. Description Description Location Location C211 404 084 3702 ELECT 0 .47U M C613 404 086 6503 POLYESTER 0.047U J C212 404 084 3801 ELECT 1U M C614 404 084 5003 POLYESTER 0.01UJ C213 404 091 6604 ELECT 4.7U M C622...
  • Page 17 Schematic Schematic Part No. Part No. Description Description Location Location C3416 404 089 6500 NP-ELECT 4.7U M D502 407 118 2207 ZENER DIODE 1Z75 (75V) C3417 404 091 6604 ELECT 4.7U M D503 408 047 6205 ZENER DIODE MTZJ36A (36V) C3418 404 089 6500 NP-ELECT...
  • Page 18 Schematic Schematic Part No. Part No. Description Description Location Location INTEGRATED CIRCUITS TRANSISTORS IC001 409 275 7903 IC LA4525 Q001 405 011 8401 TR 2SC1740S-Q IC501P 409 479 3909 IC LA7848 405 011 8500 TR 2SC1740S-R IC601 409 172 8102 IC SE130NH 405 011 8609 TR 2SC1740S-S...
  • Page 19 Schematic Schematic Part No. Part No. Description Description Location Location Q681 405 011 8401 TR 2SC1740S-Q 405 173 9605 TR 2SA1235A1E 405 011 8500 TR 2SC1740S-R 405 173 9704 TR 2SA1235A1F 405 011 8609 TR 2SC1740S-S RESISTORS 405 012 2002 TR 2SC1815-GR NOTES: 405 012 2101...
  • Page 20 Schematic Schematic Part No. Part No. Description Description Location Location R202 401 150 5905 MT-GLAZE 10K JA 1/10W R506 401 027 5205 CARBON 680 JA 1/6W R203 401 027 5502 CARBON 6.8K JA 1/6W R507 401 006 8104 CARBON 1.2 JA 1/2W R204 401 027 2105 CARBON...
  • Page 21 Schematic Schematic Part No. Part No. Description Description Location Location R807 401 150 5905 MT-GLAZE 10K JA 1/10W R3407 401 255 6005 MT-GLAZE 1M JA 1/10W R808 401 150 5905 MT-GLAZE 10K JA 1/10W R3411 401 265 4008 MT-GLAZE 62K JA 1/10W R809 401 162 3708 MT-GLAZE...
  • Page 22 Schematic Schematic Part No. Part No. Description Description Location Location MISCELLANEOUS Q901 414 012 8600 CRT A59QDF891X(ST) A100 610 310 6878 ASSY, PWB, MAIN H2BAM 414 011 7208 CRT A59QDF891X(ST) Q901A1 610 117 0154 DY SPACER-D4AK A101 645 063 9814 TUNER, U/V 645 063 9821 TUNER, U/V...
  • Page 23: Cabinet Parts List

    SCREW 4X14 (7 USED) OR 411 078 1101 SCREW 4X14 (7 USED) 412 018 8402 SCREW 3X10 (1 USED) 610 312 3622 BUTTON UNIT 610 267 0851 CAP RC 610 299 5527 DEC SHEET 610 313 0781 SANYO BADGE-LARGE — 23 —...
  • Page 24: Component And Testpoint Locations

    COMPONENT AND TESTPOINT LOCATIONS MAIN BOARD PARTS SIDE POWER VOL-UP VOL-DN CH-UP CH-DN MENU A1901 SW1902 SW1903 SW1904 SW1905 SW1906 SW1901 RL601 K1101 F-AV LF601A LF601B TP301 PS601 4A-125V KD2P KD1P PS601A 4A 125V C609 R472 C632 C609H1 C632A D612 POWER-CIRCUIT X801 C609H2...
  • Page 25: Locations

    FOR CONTINUED PROTECTION AGAINST A RISK OF FIRE, CAUTION REPLACE ONLY WITH THE SAME TYPE 4A, 125V FUSE. ATTENTION : POUR MAINTENIR LA PROTECTION CONTRE LES RISQUES D’ INCENDIE UTILISER UN FUSIBLE DE 4A 125V RECHANGE DE MEME TYPE 4A, 125V. MAIN BOARD COMPONENTS AND TEST POINTS GRID LOCATIONS Part Loc.
  • Page 26 COMPONENT AND TESTPOINT LOCATIONS MAIN BOARD FOIL SIDE MENU CH-DN CH-UP VOL-DN VOL-UP POWER A1901 R1902 R1905 R1904 SW1906 SW1905 SW1903 SW1902 SW1901 R1907 SW1904 R1903 R1906 K1101 J1901 R1106 R1102 R1101 C3403 R3406 R3411 C3402 R3402 C3406 RL601 C3407 R3407 LF601A LF601B...
  • Page 27 PICTURE TUBE SOCKET BOARD R707 Q701 Q701A R717 9V HEATER +B R727 Q721 Q721A Q711 Q711A K7Y1 PIC TUBE SOCKET BOARD COMPONENTS Part Loc. Q701 Q711 Q721 — 27 —...
  • Page 28 For parts or service contact SANYO Fisher Service Corporation 21605 Plummer Street Chatsworth, CA 91311 (U.S.A.) 300 Applewood Crescent, Concord, Ontario L4K 5C7 (CANADA) March / 2004 / 2000 SMC Printed in U.S.A. — 28 —...
  • Page 29: Block Diagram

    MODEL DS24424 Chassis No. 24424-00 WAVEFORMS CAUTION FOR CONTINUED PROTECTION AGAINST A RISK OF FIRE, REPLACE ONLY WITH SCHEMATIC DIAGRAMS THE SAME TYPE 4A, 125V FUSE. Note: Voltages were measured with offset color-bar signal and controls set for normal picture.
  • Page 30 MODEL DS24424 Chassis No. 24424-00 C1051 16EM22LBWA REMOTE SENSOR D1051 Y IN D1902 R1051 C IN TUNER A101 A1901 1/10GJ C1052 K1051 U20B40500 KK0.01LZB D1052 S-VIDEO R1052 15 16 1/10GJ 17 18 TP11 R1910 R1059 S-GND S-SW <RF AGC> C1902...

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