Sanyo AVM-2751S 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
. . . . . . . . . . . . . . . . . . 20
. . . . . . . . . . . . . . . . . . . 21 - 23
Schematic Insert
. . . . . . . . . . . . . . . 25 - 32
Schematic Notes . . . . . . . . . . . . . . . . . 25
Pin Layouts . . . . . . . . . . . . . . . . . . . . . 25
Block Diagram . . . . . . . . . . . . . . . 26 - 27
Voltage Charts . . . . . . . . . . . . . . . 26 - 27
Waveforms. . . . . . . . . . . . . . . . . . . . . . 28
AVM-2751S, G7VCM, PRODUCT CODE 111355582
Remote Control Color
Television
. . . . . . 12 - 19
. . . . . . . . . . 29 - 32
AS
FILE NO.
AVM-2751S
ORIGINAL VERSION
Chassis No. G7V-2751S0
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 . . . . . . . . . . 24 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 . . . . . . . . . . . . . . . . . . . A68ADT25X03
Semiconductors
Integrated Circuits. . . . . . . . . . . . . . . . . . . . . . . . 9
Transistors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Except within Tuner and RC Pre-Amp.
Cabinet Dimensions
Width . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 664mm
Height . . . . . . . . . . . . . . . . . . . . . . . . . . . . 589mm
Depth . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 522mm
REFERENCE No.
(U.S.A.)
86W (Avg), 2.5A (Max)
UHF/VHF/CATV
14 - 69 (UHF),
SM
780072

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  Summary of Contents for Sanyo AVM-2751S

  • Page 1: Table Of Contents

    Height ......589mm Depth ......522mm AVM-2751S, G7VCM, PRODUCT CODE 111355582 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 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. Description Part No. Description Location Location C272 403 050 6600 ELECT 3.3U M 403 311 8800 POLYESTER 0.1U J C274 403 041 8804 ELECT 10U M 403 311 8909 POLYESTER 0.1U K C284 403 041 8804 ELECT 10U M C622...
  • Page 14 Schematic Schematic Part No. Description Part No. Description Location Location C3421 403 224 5606 CERAMIC 2700P K 408 008 2406 DIODE 1N4148 C3422 403 323 3602 CERAMIC 0.047U K D601 407 005 7605 DIODE EM2B C3423 403 342 9203 TA-SOLID 3.3U K 407 013 3200 DIODE 1S1887A...
  • Page 15 Schematic Schematic Part No. Description Part No. Description Location Location D834 407 054 8509 ZENER DIODE RD18EB3 (18V) 645 016 2411 INDUCTOR, 1U K 407 099 7703 ZENER DIODE MTZJ18C (18V) L882 645 006 2490 INDUCTOR, 1U K D836 407 013 4306 DIODE 1S2076A 645 016 2411 INDUCTOR, 1U K...
  • Page 16 Schematic Schematic Part No. Description Part No. Description Location Location Q486 405 023 5009 TR 2SD400-E-MP Q701 405 041 6507 TR 2SC2621-D-RA 405 023 5306 TR 2SD400-F-MP 405 041 6705 TR 2SC2621-E-RA Q490 405 023 5009 TR 2SD400-E-MP 405 066 4304 TR 2SC2621-C-RA 405 023 5306 TR 2SD400-F-MP...
  • Page 17 Schematic Schematic Description Description Part No. Part No. Location Location R001 401 027 8602 CARBON 8.2K JA 1/6W R443 401 026 9907 CARBON 4.7K JA 1/6W R002 401 027 8602 CARBON 8.2K JA 1/6W R444 401 025 4606 CARBON 18K JA 1/6W R003 401 162 2800 MT-GLAZE...
  • Page 18 Schematic Schematic Part No. Part No. Description Description Location Location R694 401 024 7400 CARBON 10K JA 1/6W R1001 401 256 2709 MT-GLAZE 75 JA 1/10W R695 401 025 8208 CARBON 22K JA 1/6W R1021 401 256 2709 MT-GLAZE 75 JA 1/10W R701 401 025 3807 CARBON...
  • Page 19 Schematic Schematic Part No. Part No. Description Description Location Location SWITCHES MISCELLANEOUS SW1901 645 027 7382 SWITCH, PUSH (POWER) A100 610 289 2802 ASSY, PWB, MAIN SW1902 645 027 7382 SWITCH, PUSH (VOL +) A101 645 040 5150 TUNER, U/V SW1903 645 027 7382 SWITCH, PUSH (VOL –)
  • Page 20: Cabinet Parts List

    SCREW 4X14 (7 USED) 412 018 8402 SCREW 3X10 (2 USED) 610 292 2479 DEC AV SHEET 610 289 8590 BUTTON UNIT 610 102 7151 DC HOLDER (2 USED) 610 293 2843 DEC SHEET 610 236 9274 SANYO BADGE — 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 / 2001 / 2700 SMC Printed in U.S.A. — 24 —...
  • Page 25: Block Diagram

    MODEL AVM-2751S Chassis No. G7V-2751S0 CAUTION FOR CONTINUED PROTECTION AGAINST A RISK OF FIRE, REPLACE ONLY WITH THE SAME TYPE 4A, 125V FUSE. MODEL DS27510 Chassis No. 27510-00 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 A101 F1BAM0261 C101 6.3EM R856 R857 1/10GJ 1/10GJ MODEL AVM-2751S Chassis No. G7V-2751S0 100C 100C MODEL DS27510 Chassis No. 27510-00 L101 C103 R106 D101 1/2DJ27K 0.01 A1901 U20B20100 130V R1047 1/10GJ R1021 R1082 27KC 1/10GJ C1005 1/10GJ V2 IN 22KC RC PRE AMP KK0.01...