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Sanyo DS27910 Service Manual

Color television
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See also: Owner's Manual

SERVICE MANUAL

Contents
Safety Instructions . . . . . . . . . . . . . . . . . . 2
Service Adjustments . . . . . . . . . . . . . 3 - 10
Service Hints . . . . . . . . . . . . . . . . . . . . . . 10
Mechanical Disassemblies. . . . . . . . . . . 11
. . . . . . . . . . . . . . . . . . 23
. . . . . . . . . . . . . . . . . . . 24 - 27
Schematic Insert
. . . . . . . . . . . . . . . 29 - 36
Schematic Notes . . . . . . . . . . . . . . . . . 29
Pin Layouts . . . . . . . . . . . . . . . . . . . . . 25
Block Diagram . . . . . . . . . . . . . . . 30 - 31
Voltage Charts . . . . . . . . . . . . . . . 30 - 32
Waveforms. . . . . . . . . . . . . . . . . . . . . . 32
DS27910, G7YAM, PRODUCT CODE 111357080
Remote Control Color
Television
. . . . . . 12 - 22
. . . . . . . . . . 33 - 36
AS
FILE NO.
DS27910
ORIGINAL VERSION
Chassis No. 27910-00
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.

Specifications

Power Rating . . . . . . . . . . . . . . . . . . . . . 120V, 60Hz
Antenna Input Impedance . . . . . . . . . . . . . . . . 75W
Receiving Channel . . . . . . . . . . . . . . . . 2 - 13 (VHF),
01, 14-94, 95-125 (CATV)
Remote Ready . . . . . . . . . . 38 Key Remote Control
Sound Output . . . . . . . . . . . . . . . . . . . . . . 3.0 W/CH
Intermediate Frequency
Picture IF Carrier . . . . . . . . . . . . . . . . . . 45.75MHz
Sound IF Carrier . . . . . . . . . . . . . . . . . . 41.25MHz
Color Sub Carrier . . . . . . . . . . . . . . . . . 42.17MHz
Picture Tube . . . . . . . . . . . . . . . . . . A68ERF031X013
Semiconductors
Integrated Circuits. . . . . . . . . . . . . . . . . . . . . . . 12
Transistors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
Except within Tuner and RC Pre-Amp.
Cabinet Dimensions
Width . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 664mm
Height . . . . . . . . . . . . . . . . . . . . . . . . . . . . 629mm
Depth . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 487mm
REFERENCE No.
(U.S.A.)
112W (Avg), 2.5A (Max)
UHF/VHF/CATV
14 - 69 (UHF),
SM
780074

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Summary of Contents for Sanyo DS27910

  • Page 1: Table Of Contents

    Height ......629mm Depth ......487mm DS27910, G7YAM, PRODUCT CODE 111357080 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...
  • 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 FOCUS ADJUSTMENT MULTI-SOUND SECTION ADJUSTMENTS 1. Connect a color-bar generator to the antenna terminals Note: Multi-Sound Section must be adjusted after and select a crosshatch pattern. IC101 (Signal Processor), IC3401 (MTS Decoder), or 2. Set the picture controls to the Sports levels. IC802 (EEPROM) is replaced.

  • Page 10: Service Hints

    SERVICE ADJUSTMENTS (Continued) PINCUSHION CORRECTION ADJUSTMENT 1. Connect a color-bar generator to the antenna terminals Adjust No. 49 EWT for equal tilt: and select a crosshatch pattern. Ta=Tb, Tc=Td. 2. Set the picture controls to the Sports levels. 3. Turn off the receiver and disconnect the AC power cord (AC 120V line).

  • 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. Description Part No. Description Location Location C274 403 041 8804 ELECT 10U M C489 403 044 1703 ELECT 470U M C281 403 067 6204 MT-COMPO 0.15U J C493 404 056 5307 NP-ELECT 2.2U M 100V 403 166 8307 MT-POLYEST 0.15U J C497...
  • Page 14 Schematic Schematic Part No. Description Part No. Description Location Location C701 403 074 8901 CERAMIC 680P K C1740 403 049 0008 ELECT 1U M C711 403 074 8901 CERAMIC 680P K C1748 403 069 8305 CERAMIC 0.01U Z C721 403 074 8901 CERAMIC 680P K C1749...
  • Page 15 Schematic Schematic Part No. Description Part No. Description Location Location D463 407 012 4406 DIODE 1SS133 D683 407 013 4306 DIODE 1S2076A D472 407 063 8200 ZENER DIODE MTZJ10A (10V) 407 013 7109 DIODE 1S2473 D473 407 054 0008 ZENER DIODE RD10EB2 (10V) 408 008 2406 DIODE 1N4148 407 099 6102...
  • Page 16 Schematic Schematic Part No. Description Part No. Description Location Location D1901 407 057 6502 ZENER DIODE RD7.5EB3 (7.5V) 645 001 4758 INDUCTOR, 100U K 407 063 9306 ZENER DIODE MTZJ7.5C (7.5V) L717 610 029 8149 PEAKING COIL 100UH K 645 001 4758 INDUCTOR, 100U K L727 610 029 8149...
  • Page 17 Schematic Schematic Description Description Part No. Part No. Location Location Q208 405 001 7407 TR 2SA1015-O(SAN) Q681 405 011 8401 TR 2SC1740S-Q 405 001 7605 TR 2SA1015-Y(SAN) 405 011 8500 TR 2SC1740S-R 405 004 3109 TR 2SA564A-Q(CU) 405 011 8609 TR 2SC1740S-S 405 004 3208 TR 2SA564A-R(CU)
  • Page 18 Schematic Schematic Part No. Part No. Description Description Location Location Q722 (Cont.)405 020 7501 TR 2SC945A-PA 405 012 2101 TR 2SC1815-O 405 020 7709 TR 2SC945A-QA 405 012 2309 TR 2SC1815-Y 405 020 7907 TR 2SC945A-RA 405 020 7501 TR 2SC945A-PA 405 151 8705 TR 2SC536NG-NPA 405 020 7709...
  • Page 19 Schematic Schematic Part No. Part No. Description Description Location Location Q1707 405 011 8401 TR 2SC1740S-Q R001 401 024 9701 CARBON 12K JA 1/6W 405 011 8500 TR 2SC1740S-R R002 401 024 9701 CARBON 12K JA 1/6W 405 011 8609 TR 2SC1740S-S R003 401 256 3805...
  • Page 20 Schematic Schematic Part No. Part No. Description Description Location Location R426 401 256 6905 MT-GLAZE 680 JA 1/10W R602 402 000 0705 SOLID 3.3M KA 1/2W R428 401 025 1902 CARBON 15K JA 1/6W R603 401 007 2309 CARBON 100K JA 1/2W R431 401 255 9600 MT-GLAZE...
  • Page 21 Schematic Schematic Part No. Part No. Description Description Location Location R812 401 162 3005 MT-GLAZE 22K JA 1/10W R1211 401 150 6100 MT-GLAZE 2.2K JA 1/10W R813 401 150 5905 MT-GLAZE 10K JA 1/10W R1212 401 256 6608 MT-GLAZE 68K JA 1/10W R814 401 150 5905 MT-GLAZE...
  • Page 22 Schematic Schematic Part No. Part No. Description Description Location Location R3437 401 150 5806 MT-GLAZE 100K JA 1/10W MISCELLANEOUS R3441 401 256 1405 MT-GLAZE 330K JA 1/10W A100 610 291 5891 ASSY, PWB, MAIN G7YAM R3442 401 255 6500 MT-GLAZE 100 JA 1/10W A101 645 040 5150...

  • Page 23: Cabinet Parts List

    SCREW 4X14 (7 USED) 411 026 2303 SCREW 3X10 (2 USED) 610 290 1092 DEC AV SHEET 610 292 2332 BUTTON UNIT 610 267 0851 CAP RC 610 293 2560 SANYO BADGE 610 293 3116 DEC SHEET — 23 —...

  • Page 24: Component And Testpoint Locations

    COMPONENT AND TESTPOINT LOCATIONS MAIN BOARD PARTS SIDE IC3401 IV CD IC101 — 24 —...

  • Page 25: Locations

    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 FOIL SIDE IC3401 IC1201 IC301 IC101 — 26 —...
  • Page 27 PICTURE TUBE SOCKET BOARD PINCUSHION CORRECTION 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) July / 2001 / 2200 SMC Printed in U.S.A. — 28 —...

  • Page 29: Block Diagram

    MODEL DS27910 Chassis No. 27910-00 WAVEFORMS BLOCK DIAGRAM NOTE: Waveforms were taken with color bar signal and the controls adjusted for normal picture. SCHEMATIC DIAGRAMS SP901 SPEAKER CAUTION FOR CONTINUED PROTECTION AGAINST IC3401 IC001 IC101- IC101- IC101- IC101- NOTES ON SCHEMATIC DIAGRAMS...
  • Page 30 MODEL NO. DS27910 Chassis No. 27910-00 MAIN AV1/2 R1021 1/10GJ A101 V2 IN F1BAM(0261:0262) D1021 C1021 RD10EB2 16EM10 :MTZJ10B R1049 1/10GJ 27KC C108 C1081 R1048 16EM47 1/10GJ10KC TP11 J1021 C109 R1022 Y2 IN 1/10GJ S1-SW TP132 3 LINE IC301 C306...

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