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Sanyo DS27820 Service Manual

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See also: Owner's Manual

SERVICE MANUAL

Contents
Safety Instructions . . . . . . . . . . . . . . . . . . 2
Service Adjustments . . . . . . . . . . . . . . 3 - 9
Service Hints . . . . . . . . . . . . . . . . . . . . . . 10
Mechanical Disassemblies. . . . . . . . . . . 11
Chassis Electrical Parts List . . . . . . 12 - 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 Diagram . . . . . . . . . . . 33 - 36
DS27820, G7JAM, PRODUCT CODE 111358980
Remote Control Color
Television

Specifications

Power Rating . . . . . . . . . . . . . . . . . . . . . 120V, 60Hz
Antenna Input Impedance . . . . . . . . . . . . . . . . . 75Ω
Receiving Channel . . . . . . . . . . . . . . . . 2 - 13 (VHF),
Remote Ready . . . . . . . . . . 38 Key Remote Control
Sound Output . . . . . . . . . . . . . . . . . . . . . . 3.0 W/CH
Intermediate Frequency
Picture Tube . . . . . . . . . . . . . . . . . . . A68AJB82X04
Semiconductors
Cabinet Dimensions
AS
FILE NO.
DS27820
ORIGINAL VERSION
Chassis No. 27820-00
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.
86W (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. . . . . . . . . . . . . . . . . . . . . . . 12
Transistors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Except within Tuner and RC Pre-Amp.
Width . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 664 mm
Height . . . . . . . . . . . . . . . . . . . . . . . . . . . . 629 mm
Depth . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 541 mm
REFERENCE No.
(U.S.A.)
UHF/VHF/CATV
14 - 69 (UHF),
SM
780080

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Summary of Contents for Sanyo DS27820

  • Page 1: Table Of Contents

    Height ......629 mm Depth ......541 mm DS27820, G7JAM, PRODUCT CODE 111358980 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 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 9 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 C253 403 086 1808 NP-ELECT 0.47U M 403 166 7706 MT-POLYEST 0.47U J C256 403 049 0008 ELECT 1U M C506 403 062 5301 POLYESTER 5600P K C257 403 224 6108 CERAMIC 0.01U K 403 312 2401...
  • Page 14 Schematic Schematic Part No. Description Part No. Description Location Location C856 403 049 0008 ELECT 1U M C8017 403 319 4804 CERAMIC 0.22U Z C857 403 235 1000 CERAMIC 220P J C8021 403 357 9601 CERAMIC 0.1U Z C858 403 224 5705 CERAMIC 1000P K C8022...
  • Page 15 Schematic Schematic Part No. Description Part No. Description Location Location 407 124 6404 DIODE ERA18-04 407 211 6102 DIODE FE301-1L43 D482 407 011 4407 DIODE TVR1G D625 407 129 7000 DIODE RU4AM LF-L1 D483 407 007 6606 DIODE ES1 407 211 5808 DIODE FE201-6L43 407 124 5506 DIODE RMPG06G...
  • Page 16 Schematic Schematic Part No. Description Part No. Description Location Location IC681 409 066 7303 IC UPC78L05J 645 016 3104 INDUCTOR, 5.6U K 409 241 8309 IC TA78L05S L8008 645 008 2894 INDUCTOR, 5.6U K IC801 410 388 2006 IC M37272M8-XXXFP T4 645 016 3104 INDUCTOR, 5.6U K IC802...
  • Page 17 Schematic Schematic Description Description Part No. Part No. Location Location 405 006 1707 TR 2SA933S-Q 405 151 8705 TR 2SC536NG-NPA 405 006 1806 TR 2SA933S-R 405 157 0505 TR 2SC536NF-NPA 405 151 3304 TR 2SA608NF-NPA Q681 405 011 8401 TR 2SC1740S-Q 406 000 6804 TR 2SA1015-GR(SAN) 405 011 8500...
  • Page 18 Schematic Schematic Part No. Part No. Description Description Location Location 405 006 1707 TR 2SA933S-Q 405 012 2309 TR 2SC1815-Y 405 006 1806 TR 2SA933S-R 405 020 7501 TR 2SC945A-PA 405 151 3304 TR 2SA608NF-NPA 405 020 7709 TR 2SC945A-QA 406 000 6804 TR 2SA1015-GR(SAN) 405 020 7907...
  • Page 19 Schematic Schematic Part No. Part No. Description Description Location Location RESISTORS R271 401 162 3401 MT-GLAZE 39K JA 1/10W R272 401 027 5502 CARBON 6.8K JA 1/6W NOTES: R273 401 024 7400 CARBON 10K JA 1/6W Read description of the Resistor as follows: R274 401 162 4101 MT-GLAZE...
  • Page 20 Schematic Schematic Part No. Part No. Description Description Location Location R495 401 066 5204 OXIDE-MT 22 JA R716 401 009 1508 CARBON 2.7K JA 1/2W R497 401 059 9608 OXIDE-MT 2.2 JA R717 401 065 4604 OXIDE-MT 12K JA R499 401 026 6609 CARBON 390 JA 1/6W...
  • Page 21 Schematic Schematic Part No. Part No. Description Description Location Location R1021 401 256 2709 MT-GLAZE 75 JA 1/10W R8014 401 255 9600 MT-GLAZE 820K JA 1/10W R1041 401 162 3005 MT-GLAZE 22K JA 1/10W R8015 401 255 5800 MT-GLAZE 2K JA 1/10W R1042 401 162 3005 MT-GLAZE...
  • Page 22 Schematic Schematic Part No. Part No. Description Description Location Location TRANSFORMERS F601A 645 000 5077 HOLDER, FUSE 645 016 0479 HOLDER, FUSE T151 645 049 3775 TRANS, OSC 45.75MHZ F601B 645 000 5077 HOLDER, FUSE T401 610 000 1138 DRIVE TRANS 645 016 0479 HOLDER, FUSE 610 223 1663...

  • Page 23: Cabinet Parts List

    SCREW 4X14 (6 USED) 411 026 2303 SCREW 3X10 (2 USED) 610 297 6120 DEC AV SHEET 610 96 7258 BUTTON UNIT 610 285 1199 CAP RC 610 299 5763 DEC SHEET 610 293 2560 SANYO BADGE — 23 —...

  • Page 24: Component And Testpoint Locations

    COMPONENT AND TESTPOINT LOCATIONS MAIN BOARD FOIL SIDE — 24 —...
  • Page 25 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 MAIN BOARD COMPONENTS AND TEST POINTS PIC TUBE SOCKET BOARD COMPONENTS GRID LOCATIONS...
  • Page 26 COMPONENT AND TESTPOINT LOCATIONS (Cont.) MAIN BOARD PARTS SIDE IC3401 IC101 — 26 —...
  • Page 27 PICTURE TUBE SOCKET BOARD — 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) April / 2002 / 2000 SMC Printed in U.S.A. — 28 —...

  • Page 29: Block Diagram

    MODEL DS27820 Chassis No. 27820-00 WAVEFORMS CAUTION FOR CONTINUED PROTECTION AGAINST A RISK OF FIRE, REPLACE ONLY WITH THE SAME TYPE 4A, 125V FUSE. BLOCK DIAGRAM NOTE: Waveforms were taken with color-bar signal and the controls adjusted for normal picture.
  • Page 30 MODEL DS27820 Chassis No. 27820-00 MAIN AV1/2 S1-SW R1021 A101 1/10GJ F1BAM0290 V2 IN C8091 R8097 R8096 R8093 R8092 <PIP CVBS IN> INT V KK0.01 1/10GJ 1/10GJ 1/10GJ 1/10GJ L8071 L8091 47KC 18KC 47KC 18KC D1021 C1021 L8070 16EM10 R8071...

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