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Sanyo DS25520 Service Manual
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Sanyo DS25520 Service Manual

Remote control color television
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See also: Owner's Manual , Manual

SERVICE MANUAL

Contents
Safety Instructions . . . . . . . . . . . . . . . . . . 2
Service Adjustments . . . . . . . . . . . . . . 3 - 9
Purity and Convergence . . . . . . . . . 10 - 11
Service Hints . . . . . . . . . . . . . . . . . . . . . . 12
Mechanical Disassemblies. . . . . . . . . . . 13
Chassis Electrical Parts List . . . . . . 14 - 20
Cabinet Parts List . . . . . . . . . . . . . . . . . . 21
Locations . . . . . . . . . . . . . . . . . . . 22 - 24
Schematic Insert . . . . . . . . . . . . . . . 25 - 32
Schematic Notes . . . . . . . . . . . . . . . . . 25
Pin Layouts . . . . . . . . . . . . . . . . . . . . . 25
Block Diagram . . . . . . . . . . . . . . . 26 - 27
Voltage Charts . . . . . . . . . . . . . . . 26 - 28
Waveforms. . . . . . . . . . . . . . . . . . . . . . 28
Schematic Diagram . . . . . . . . . . . 29 - 32
DS25520, G7LAM, PRODUCT CODE 111358880
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 . . . . . . . . . . . . . . . . . . . . . A63AHC26X
Semiconductors
Integrated Circuits. . . . . . . . . . . . . . . . . . . . . . . . 9
Transistors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Cabinet Dimensions
Width . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 700mm
Height . . . . . . . . . . . . . . . . . . . . . . . . . . . . 567mm
Depth . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 510mm
AS
FILE NO.
DS25520
ORIGINAL VERSION
Chassis No. 25520-00
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.
(U.S.A.)
(CANADA)
SM
780078

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Summary of Contents for Sanyo DS25520

  • Page 1: Table Of Contents

    Height ......567mm Depth ......510mm DS25520, G7LAM, PRODUCT CODE 111358880 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 VCO ADJUSTMENT This receiver is designed for UHF/VHF reception. A 75 ohm Note: VCO must be adjusted after IC101 (Signal Processor), terminal is provided for UHF and VHF receptions. When IC802 (EEPROM) or T151 (VCO Coil) is replaced. connecting a CATV antenna system, connect the 75 ohm 1.
  • 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: Integrated Circuits

    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: 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 11: 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 12: 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 13: 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 14: 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 15 Schematic Schematic Part No. Part No. Description Description Location Location C401 404 084 3306 ELECT 470U M C689 403 357 9601 CERAMIC 0.1U Z C402 403 224 6108 CERAMIC 0.01U K C693 404 087 1200 ELECT 0.1U M C403 404 086 6800 POLYESTER 6800P J C701...
  • Page 16 Schematic Schematic Part No. Part No. Description Description Location Location D629 407 054 7007 ZENER DIODE RD16EB1 (16V) DIODES 407 099 7208 ZENER DIODE MTZJ16A (16V) D001 408 047 4706 ZENER DIODE MTZJ15B (15V) D680 407 013 4306 DIODE 1S2076A D101 408 047 6205 ZENER DIODE MTZJ36A (36V)
  • Page 17 Schematic Schematic Part No. Description Part No. Description Location Location L801 645 008 2894 INDUCTOR, 5.6U K Q402 405 153 0202 TR 2SD2578-YB 645 016 3104 INDUCTOR, 5.6U K Q486 405 023 5009 TR 2SD400-E-MP L811 645 006 2490 INDUCTOR, 1U K 405 023 5306 TR 2SD400-F-MP 645 016 2411...
  • Page 18 Schematic Schematic Description Description Part No. Part No. Location Location 405 066 9903 TR 2SC2688(1)-K R006 401 014 4105 CARBON 1.5K JA 1/4W 405 067 0008 TR 2SC2688(1)-L R013 401 027 2600 CARBON 5.6K JA 1/6W 405 067 0107 TR 2SC2688(1)-M R106 401 008 2001 CARBON...
  • Page 19 Schematic Schematic Part No. Description Part No. Description Location Location R488 401 059 1602 OXIDE-MT 15 JA R724 401 027 8107 CARBON 82 JA 1/6W R489 401 066 5204 OXIDE-MT 22 JA R726 401 009 1508 CARBON 2.7K JA 1/2W R491 401 012 5708 CARBON...
  • Page 20 Schematic Schematic Part No. Part No. Description Description Location Location R1907 401 256 0408 MT-GLAZE 12K JA 1/10W CRYSTAL/FILTERS R1909 401 024 7004 CARBON 1K JA 1/6W X141 421 008 9008 SAW F TSF5235P R1910 401 024 7004 CARBON 1K JA 1/6W X161 610 015 3059 TRAP, CERAMIC 4.5MHZ...

  • Page 21: Cabinet Parts List

    412 036 1805 SCREW 4X14 (7 USED) OR 411 078 1101 SCREW 4X14 (7 USED) 412 018 8402 SCREW 3X10 (1 USED) 610 296 9610 BUTTON UNIT 610 285 1199 CAP RC 610 293 2560 SANYO BADGE-LARGE (SILVER) — 21 —...

  • Page 22: Component And Testpoint Locations

    COMPONENT AND TESTPOINT LOCATIONS MAIN BOARD PARTS SIDE 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.

  • Page 23: Transistors

    MAIN BOARD FOIL SIDE MENU CH-DN CH-UP VOL-DN VOL-UP POWER A1901 R1905 R1902 R1904 R1906 SW1906 R1907 SW1905 SW1904 SW1903 SW1902 SW1901 R1903 K011 K1011 J1901 RL601 J011 R3406 C3403 C3406 C3402 C3407 R3402 R3407 LF601A LF601B LF601 R627 PS601 KD1P KD2P C3422...
  • 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) April / 2002 / 2000 SMC Printed in U.S.A.

  • Page 25: Schematic Insert

    MODEL DS25520 Chassis No. 25520-00 WAVEFORMS SCHEMATIC DIAGRAMS Note: Voltages were measured with offset color-bar signal and controls adjusted for normal picture. CAUTION FOR CONTINUED PROTECTION AGAINST A RISK OF FIRE, REPLACE ONLY WITH THE SAME TYPE 4A, 125V FUSE.
  • Page 26 MODEL DS25520 Chassis No. 25520-00 R1051 1/10GJ Y IN C1051 A101 D1051 LBWA K1051 S/COMP SW C IN AV1/AV2 SW 16EM R1082 R1081 1/10GJ22KC 1/10GJ22KC C1052 R1052 D1052 KK0.01LZB 1/10GJ S-GND R1059 R1004 R1007 S-SW L1001 1/10GJ 1/10GJ 27KC 27KC...

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