Sanyo DS20424 Service Manual
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Sanyo DS20424 Service Manual

Remote control color television
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See also: Owner's Manual

SERVICE MANUAL

Contents
Safety Instructions . . . . . . . . . . . . . . . . . . 2
Service Adjustments . . . . . . . . . . . . . 3 - 10
Service Hints . . . . . . . . . . . . . . . . . . . . . . 11
Mechanical Disassemblies. . . . . . . . . . . 12
Chassis Electrical Parts List . . . . . . 13 - 19
Cabinet Parts List . . . . . . . . . . . . . . . . . . 20
Locations . . . . . . . . . . . . . . . . . . . 21 - 24
Schematic Insert . . . . . . . . . . . . . . . 25 - 32
Schematic Notes . . . . . . . . . . . . . . . . . 25
Pin Layouts . . . . . . . . . . . . . . . . . . . . . 25
Capacitor and Resistor Codes . . . . . . 25
Block Diagram . . . . . . . . . . . . . . . 26 - 27
Voltage Charts . . . . . . . . . . . . . . . 26 - 27
Waveforms. . . . . . . . . . . . . . . . . . . . . . 28
Schematic Diagrams . . . . . . . . . . 29 - 32
DS20424, G8TGM, PRODUCT CODE 111367886
Remote Control Color
Television

Specifications

Power Rating . . . . . . . . . . . . . . . . . . . . . 120V, 60Hz
Antenna Input Impedance . . . . . . . . . . . . . . . . . 75Ω
Receiving Channel . . . . . . . . . . . . . . . . 2 - 13 (VHF),
Remote Ready . . . . . . . . . . 24 Key Remote Control
Sound Output . . . . . . . . . . . . . . . . . . . . . . 1.0 W/CH
Intermediate Frequency
Picture Tube . . . . . . . . . . . . . . . . . A51QDX993X001
Semiconductors
Cabinet Dimensions
AS
FILE NO.
DS20424
ORIGINAL VERSION
Chassis No. 20424-00
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.
65W (Avg), 1.4A (Max)
01, 14-94, 95-125 (CATV)
Picture IF Carrier . . . . . . . . . . . . . . . . . . 45.75MHz
Sound IF Carrier . . . . . . . . . . . . . . . . . . 41.25MHz
Color Sub Carrier . . . . . . . . . . . . . . . . . 42.17MHz
Integrated Circuits. . . . . . . . . . . . . . . . . . . . . . . . 8
Transistors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Except within Tuner and RC Pre-Amp.
Width . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 588mm
Height . . . . . . . . . . . . . . . . . . . . . . . . . . . . 466mm
Depth . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 493mm
REFERENCE No.
(U.S.A.)
(CANADA)
UHF/VHF/CATV
14 - 69 (UHF),
SM
780099

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Summary of Contents for Sanyo DS20424

  • Page 1: Table Of Contents

    Height ......466mm Depth ......493mm DS20424, G8TGM, PRODUCT CODE 111367886 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.) 16. Select NO. 67 VMD6VMG3SSN (VM Delay / VM Gain / Sync Sep Sens) with key. Adjust the data with number keys for 22. 17. Select NO. 84 OP2 (Component / V Guide) 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 00110011 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) ↓...
  • 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: 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 13: 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 14 Schematic Schematic Part No. Part No. Description Description Location Location C214 404 084 4006 ELECT 2.2U M C702 403 069 8305 CERAMIC 0.01U Z C216 403 224 6108 CERAMIC 0.01U K C711 403 235 1109 CERAMIC 270P J C218 404 084 3207 ELECT 47U M C721...
  • Page 15 Schematic Schematic Part No. Part No. Description Description Location Location DIODES D683 407 013 4306 DIODE 1S2076A D002 407 013 4306 DIODE 1S2076A 407 013 7109 DIODE 1S2473 408 008 2406 DIODE 1N4148 407 013 7109 DIODE 1S2473 D693 407 099 5600 ZENER DIODE MTZJ6.8A (6.8V) 408 008 2406 DIODE 1N4148...
  • Page 16 Schematic Schematic Part No. Part No. Description Description Location Location L1901 645 008 2894 INDUCTOR, 5.6U K 405 151 8705 TR 2SC536NG-NPA 645 016 3104 INDUCTOR, 5.6U K 405 157 0505 TR 2SC536NF-NPA Q693 405 011 8401 TR 2SC1740S-Q 405 011 8500 TR 2SC1740S-R 405 011 8609 TR 2SC1740S-S...
  • Page 17 Schematic Schematic Part No. Part No. Description Description Location Location RESISTORS R208 401 256 6905 MT-GLAZE 680 JA 1/10W NOTES: R209 401 256 7100 MT-GLAZE 680K JA 1/10W Read description of the Resistor as follows: R276 401 024 9701 CARBON 12K JA 1/6W R281 401 150 5905...
  • Page 18 Schematic Schematic Part No. Part No. Description Description Location Location R613 401 064 1802 OXIDE-MT 0.39 JA R1007 401 256 2709 MT-GLAZE 75 JA 1/10W R616 401 150 5905 MT-GLAZE 10K JA 1/10W R1008 401 256 2709 MT-GLAZE 75 JA 1/10W R617 402 001 7208 FUSIBLE RES...
  • Page 19 Schematic Schematic Part No. Part No. Description Description Location Location TRANSFORMERS F601A 645 000 5077 HOLDER, FUSE T401 610 223 1656 DRIVE TRANS 645 016 0479 HOLDER, FUSE F601B 645 000 5077 HOLDER, FUSE 652 000 0703 TRANS, DRIVE 645 016 0479 HOLDER, FUSE 652 001 2400 TRANS, DRIVE...

  • Page 20: Cabinet Parts List

    412 018 8402 SCREW 3X10 (1 USED) 610 306 5007 BUTTON UNIT 610 289 5148 CAP RC 610 317 4648 DEC SHEET 645 067 3818 SANYO BADGE 610 306 5342 DEC AV SHEET 610 306 5311 DOOR — 20 —...

  • Page 21: Component And Testpoint Locations

    COMPONENT AND TESTPOINT LOCATIONS MAIN BOARD FOIL SIDE MENU CH-DN CH-UP VOL-DN POWER VOL-UP A1901 R1902 R1905 R1904 SW1906 R1907 SW1905 SW1904 SW1903 SW1902 SW1901 R1903 R1906 K1101 J1901 R1106 R1102 R1101 C3403 R3406 C3402 R3411 R3402 C3406 RL601 C3407 R3407 LF601A LF601B...
  • Page 22 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 23 COMPONENT AND TESTPOINT LOCATIONS (Cont.) 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...
  • Page 24 PIC TUBE SOCKET BOARD COMPONENTS Part Loc. Q701 Q711 Q721 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) July / 2004 / 2000 SMC Printed in U.S.A.

  • Page 25: Block Diagram

    MODEL DS20424 Chassis No. 20424-00 WAVEFORMS CAUTION FOR CONTINUED PROTECTION AGAINST A RISK OF FIRE, REPLACE ONLY WITH SCHEMATIC DIAGRAMS Note: Voltages were measured with offset color-bar signal and controls set for normal picture. THE SAME TYPE 4A, 125V FUSE.
  • Page 26 MODEL DS20424 Chassis No. 20424-00 TUNER C1051 16EM22LBWA REMOTE SENSOR Y IN D1902 R1051 A101 D1051 1/10GJ C IN A1901 K1051 C1052 U20B40500 KK0.01LZB R1052 S-VIDEO 1/10GJ D1052 TP11 R1910 S-GND R1059 S-SW <RF AGC> C1902 C106 L1901 16EM10 C1059 EM3.3...

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