Sanyo DS31520 Service Manual

Sanyo DS31520 Service Manual

Remote control color television
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SERVICE MANUAL

Contents
Safety Instructions . . . . . . . . . . . . . . . . . . 2
Service Adjustments . . . . . . . . . . . . . . 3 - 9
Service Hints . . . . . . . . . . . . . . . . . . . . . . 10
Mechanical Disassemblies. . . . . . . . . . . 11
Chassis Electrical Parts List . . . . . . 12 - 19
Cabinet Parts List . . . . . . . . . . . . . . . . . . 20
Locations . . . . . . . . . . . . . . . . . . . 21 - 23
Schematic Insert . . . . . . . . . . . . . . . 25 - 32
Schematic Notes . . . . . . . . . . . . . . . . . 25
Pin Layouts . . . . . . . . . . . . . . . . . . . . . 25
Block Diagram . . . . . . . . . . . . . . . 26 - 28
Voltage Charts . . . . . . . . . . . . . . . 26 - 27
Waveforms. . . . . . . . . . . . . . . . . . . . . . 28
Schematic Diagrams . . . . . . . . . . 29 - 32
DS31520, G7SAM, PRODUCT CODE 111359080
Remote Control Color
Television

Specifications

Power Rating . . . . . . . . . . . . . . . . . . . . . 120V, 60Hz
Antenna Input Impedance . . . . . . . . . . . . . . . . . 75Ω
Receiving Channel . . . . . . . . . . . . . . . . 2 - 13 (VHF),
Remote Ready . . . . . . . . . . 37 Key Remote Control
Sound Output . . . . . . . . . . . . . . . . . . . . . . 1.0 W/CH
Intermediate Frequency
Picture Tube . . . . . . . . . . . . . . . . . . M78JUA361X72
Semiconductors
Cabinet Dimensions
AS
FILE NO.
DS31520
ORIGINAL VERSION
Chassis No. 31520-00
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.
89W (Avg), 2.5A (Max)
01, 14-94, 95-125 (CATV)
Picture IF Carrier . . . . . . . . . . . . . . . . . . 45.75MHz
Sound IF Carrier . . . . . . . . . . . . . . . . . . 41.25MHz
Color Sub Carrier . . . . . . . . . . . . . . . . . 42.17MHz
Integrated Circuits. . . . . . . . . . . . . . . . . . . . . . . 10
Transistors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Except within Tuner and RC Pre-Amp.
Width . . . . . . . . . . . . . . . . . . . . . . . . . . . . 754 mm
Height . . . . . . . . . . . . . . . . . . . . . . . . . . . . 732 mm
Depth . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 538 mm
REFERENCE No.
(U.S.A.)
UHF/VHF/CATV
14 - 69 (UHF),
SM
780079

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Table of Contents
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Summary of Contents for Sanyo DS31520

  • Page 1: Table Of Contents

    Height ......732 mm Depth ......538 mm DS31520, G7SAM, PRODUCT CODE 111359080 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. IC802 (EEPROM) REPLACEMENT When 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.
  • Page 4 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 5 Table 1. ON-SCREEN SERVICE MENU (Continued) 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 (Continued) DRIVE / BIAS ADJUSTMENTS PROGRAM CODES Note 3. Red/Blue Drive Adjustments in Service Menu NO. The microprossesor used in this model is a multi-purpose 72 DRV: Adjust Red and Blue Drive Levels alternately with type and is used in several different models. To ensure 1, 3, 7, and 9 keys on the remote control.
  • Page 7: Antenna Connections

    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 1/2W to coaxial cable directly to the 75 ohm terminal.
  • Page 8 SERVICE ADJUSTMENTS (Continued) GRAYSCALE ADJUSTMENT BRIGHTNESS LEVEL ADJUSTMENT 1. Set the picture controls to the Sports levels or Reset Note: Grayscale, RF AGC, Video Level, and High Voltage Check (use MENU key and key or RESET key). must be adjusted before attempting Brightness Level 2.
  • Page 9 SOUND ADJUSTMENT SEPARATION ADJUSTMENT 1. Connect a color-bar generator to the antenna terminals 7. Turn off the receiver and disconnect the AC power cord with audio signal of 1KHz at 100% modulation. (AC 120V line). 2. Set the picture controls to the Sports levels 8.
  • Page 10: 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 unnecessary damage: •...
  • Page 11: Mechanical Disassemblies

    MECHANICAL DISASSEMBLIES CHASSIS REMOVAL CABINET BACK REMOVAL 1. Remove cabinet back. 1. Refer to Figure 1, remove 10 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 12: 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 13 Schematic Schematic Part No. Part No. Description Description Location Location C274 403 041 8804 ELECT 10U M 403 312 0100 POLYESTER 0.018U K C284 403 041 8804 ELECT 10U M C508 403 235 0300 CERAMIC 56P J C285 403 224 6108 CERAMIC 0.01U K C509...
  • Page 14 Schematic Schematic Part No. Description Part No. Description Location Location C1031 403 224 6108 CERAMIC 0.01U K D486 407 099 6102 ZENER DIODE MTZJ10B (10V) C1081 403 043 9106 ELECT 47U M 407 054 0008 ZENER DIODE RD10EB2 (10V) C1902 403 041 8804 ELECT 10U M...
  • Page 15 Schematic Schematic Part No. Description Part No. Description Location Location D680 408 008 2406 DIODE 1N4148 COILS 407 013 4306 DIODE 1S2076A LF601 645 042 7510 LINE FILTER 407 013 7109 DIODE 1S2473 L164 645 003 9713 INDUCTOR, 15U K D683 408 008 2406 DIODE 1N4148...
  • Page 16 Schematic Schematic Part No. Description Part No. Description Location Location 405 020 7501 TR 2SC945A-PA 405 011 8500 TR 2SC1740S-R 405 020 7709 TR 2SC945A-QA 405 011 8609 TR 2SC1740S-S 405 020 7907 TR 2SC945A-RA 405 012 2002 TR 2SC1815-GR Q005 405 008 4805 TR 2SB764-E...
  • Page 17 Schematic Schematic Description Description Part No. Part No. Location Location 405 041 6507 TR 2SC2621-D-RA R162 401 150 5806 MT-GLAZE 100K JA 1/10W 405 041 6705 TR 2SC2621-E-RA R163 401 256 0002 MT-GLAZE 120 JA 1/10W 405 066 9903 TR 2SC2688(1)-K R164 401 150 6209 MT-GLAZE...
  • Page 18 Schematic Schematic Part No. Part No. Description Description Location Location R469 401 024 7004 CARBON 1K JA 1/6W R695 401 025 8208 CARBON 22K JA 1/6W R481 401 006 7701 CARBON 1 JB 1/2W R701 401 025 3807 CARBON 180 JA 1/6W R482 401 011 9004 CARBON...
  • Page 19 Schematic Schematic Part No. Part No. Description Description Location Location R1026 401 026 9600 CARBON 470 JA 1/6W MISCELLANEOUS R1027 401 162 3708 MT-GLAZE 4.7K JA 1/10W A001 610 295 6849 ASSY, PWB,MAIN R1031 401 256 2709 MT-GLAZE 75 JA 1/10W A101 645 052 6084 TUNER, U/V...
  • Page 20: Cabinet Parts List

    SCREW 4X14 (8 USED) 411 O26 2303 SCREW 3X10 (2 USED) 610 297 6113 DEC AV SHEET 610 295 7860 BUTTON UNIT 610 267 0851 CAP RC 610 296 4318 DEC SHEET 610 293 2560 SANYO BADGE-LARGE (SILVER) — 20 —...
  • Page 21: Component And Testpoint Locations

    COMPONENT AND TESTPOINT LOCATIONS MAIN BOARD FOIL SIDE — 21 —...
  • Page 22 COMPONENT AND TESTPOINT LOCATIONS (Cont.) MAIN BOARD PARTS SIDE IC3401 IC101 — 22 —...
  • Page 23 CAUTION FOR CONTINUED PROTECTION AGAINST A RISK OF FIRE, REPLACE ONLY WITH THE SAME TYPE 4A, 125V FUSE. ATTENTION : POUR MAINTENIR LA PROTECTION CONTRE LES RISQUES D’ INCENDIE UTILISER UN FUSIBLE DE RECHANGE DE MEME TYPE 4A, 125V. 4A 125V PICTURE TUBE SOCKET BOARD MAIN BOARD COMPONENTS AND TEST POINTS PIC TUBE SOCKET BOARD COMPONENTS...
  • Page 24 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) April / 2002 / 2000 SMC Printed in U.S.A. — 24 —...
  • Page 25: Block Diagram

    MODEL DS31520 Chassis No. 31520-00 CAUTION FOR CONTINUED PROTECTION AGAINST A RISK OF FIRE, REPLACE ONLY WITH THE SAME TYPE 4A, 125V FUSE. BLOCK DIAGRAM ATTENTION: POUR MAINTENIR LA PROTECTION CONTRE LES RISQUES D' INCENDIE UTILISER UN 4A 125V FUSIBLE DE RECHANGE DE MEME TYPE 4A, 125V.
  • Page 26 MODEL DS31520 Chassis No. 31520-00 S1-SW V2 IN A101 F1BAM0261: R1021 F1BAM0262 C1021 1/10GJ D1021 16EM10 C1081 16EM47 Y1 IN C101 IC301 C1022 6.3EM 3 LINE C306 COMB D1022 TDA9183 16EM K1051 KZ0.1 FILTER T/N1P R1022 R856 R857 1/10GJ 1/10GJ...

Table of Contents