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Sanyo AVM-1901S Service Manual

Remote control color television
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SERVICE MANUAL

Contents
Safety Instructions . . . . . . . . . . . . . . . . . . . . . . . 2
Service Adjustments . . . . . . . . . . . . . . . . . . . 3 - 7
Service Hints . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Mechanical Disassemblies. . . . . . . . . . . . . . . . 11
Chassis Electrical Parts List . . . . . . . . . . . 12 - 17
Cabinet Parts List . . . . . . . . . . . . . . . . . . . . . . 18
Schematic Diagrams . . . . . . . . . . . . . . . . 25 - 32
Block Diagram . . . . . . . . . . . . . . . . . . . . . 26 - 27
Voltage Charts . . . . . . . . . . . . . . . . . . . . . 26 - 27
Waveforms. . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
AVM-1901S, G6VMM, PRODUCT CODE 111340691
Remote Control Color
Television

Specifications

Power Rating . . . . . . . . . . . . . . . . . . . . . . 120V, 60Hz
Antenna Input Impedance . . . . . . . . . . . . . . . . . . 75Ω
Receiving Channel . . . . . . . . . . . . . . . . . 2 - 13 (VHF),
Remote Ready . . . . . . . . . . . 23 Key Remote Control
Sound Output . . . . . . . . . . . . . . . . . . . . . . . . . . 1.0 W
Intermediate Frequency
Picture Tube . . . . . . . . . . . A48AAB37X/A48AGD12X
Semiconductors
Cabinet Dimensions
AS
FILE NO.
AVM-1901S
ORIGINAL VERSION
Chassis No. G6V-1901S0
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.
68W (Avg), 1.4A (Max)
01, 14-94, 95-125 (CATV)
Picture IF Carrier . . . . . . . . . . . . . . . . . . 45.75MHz
Sound IF Carrier . . . . . . . . . . . . . . . . . . . 41.25MHz
Color Sub Carrier . . . . . . . . . . . . . . . . . . 42.17MHz
Integrated Circuits. . . . . . . . . . . . . . . . . . . . . . . . . 7
Transistors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Except within Tuner and RC Pre-Amp.
Width. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 488mm
Height . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 452mm
Depth . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 467mm
REFERENCE No.
(U.S.A.)
(CANADA)
UHF/VHF/CATV
14 - 69 (UHF),
SM
5110190

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  Summary of Contents for Sanyo AVM-1901S

  • Page 1: Table Of Contents

    Height ......452mm Depth ......467mm AVM-1901S, G6VMM, PRODUCT CODE 111340691 REFERENCE No.
  • Page 2: Safety Instructions

    SAFETY INSTRUCTIONS SAFETY PRECAUTIONS WARNING: The chassis of this receiver has a floating ground READING SHOULD NOT EXCEED 750 mV. with the potential of one half the AC line voltage in respect to AC VOLTMETER earth ground. Service should not be attempted by anyone not (5000 ohms per volt or more sensitivity) familiar with the precautions necessary when working on this type of equipment.
  • 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 opera- tion.
  • 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: Service Adjustments

    SERVICE ADJUSTMENTS (Continued) PROGRAM CODES The microprocessor used in this model is a multi-purpose type Note 2. Red/Blue Drive Adjustments in Service Menu No. and is used in several different models. To ensure proper 072 DRV: Adjust Red and Blue Drive Levels alternately with 1, 3, 7, and 9 keys on the remote control.
  • Page 6 SERVICE ADJUSTMENTS (Continued) GRAYSCALE ADJUSTMENT ANTENNA CONNECTIONS 1. Set the picture controls to the Auto levels. This receiver is designed for UHF/VHF reception. A 75 ohm 2. Turn off the receiver and disconnect the AC power cord terminal is provided for UHF and VHF receptions. When (120V AC line).
  • Page 7 VCO ADJUSTMENT 10. Check brightness level on every active channel, readjust (repeat steps 5 ~ 9) if necessary. Note: VCO must be adjusted after IC101 (Signal Processor), Note: Do not set to excessive brightness level, otherwise the IC802 (EEPROM) or T151 (PLL VCO Coil) is replaced. contrast level will be suppressed.
  • Page 8: Purity And Convergence Adjustments

    PURITY AND CONVERGENCE ADJUSTMENTS CAUTION: 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 the necessary readjustments. PURITY ADJUSTMENT 1. When replacing picture tube or deflection yoke, mount deflection yoke and purity-convergence magnets assembly properly.
  • Page 9: 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 the 2. Set Contrast control to low level to eliminate Blooming. yoke as follows: Reduce Brightness level to obtain black background if 1.
  • Page 10: Service Hints

    SERVICE HINTS POWER FAILURE DETECTOR This set 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 which results in a low voltage supply, the CPU will turn the set 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 4 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 C402 403 224 6108 CERAMIC 0.01U K C831 403 049 0008 ELECT 1U M C403 403 063 0206 POLYESTER 6800P K C834 403 224 6108 CERAMIC 0.01U K 403 312 2807 POLYESTER 6800P K C841 403 224 6108...
  • Page 14 Schematic Schematic Description Description Part No. Part No. Location Location D604 407 005 7605 DIODE EM2B L164 645 003 9713 INDUCTOR,15U K 407 013 3200 DIODE 1S1887A 645 016 2657 INDUCTOR,15U K 408 008 8606 DIODE GP15G L401 645 017 7682 INDUCTOR,5.6U,FILTER D605 407 005 7605...
  • Page 15 Schematic Schematic Part No. Description Part No. Description Location Location Q711 405 041 6507 TR 2SC2621-D-RA J257 401 150 6001 MT-GLAZE 0.000 ZA 1/10W 405 041 6705 TR 2SC2621-E-RA J286 401 150 6001 MT-GLAZE 0.000 ZA 1/10W 405 066 4304 TR 2SC2621-C-RA J291 401 150 6001...
  • Page 16 Schematic Schematic Part No. Description Part No. Description Location Location R724 401 255 9006 MT-GLAZE 82 JA 1/10W R482 401 011 9004 CARBON 1 JB 1/4W R726 401 009 1508 CARBON 2.7K JA 1/2W R483 401 006 7701 CARBON 1 JB 1/2W R727 401 058 9807 OXIDE-MT...
  • Page 17 Schematic Schematic Description Description Part No. Part No. Location Location SW1905 645 006 9673 SWITCH,PUSH 1P-1T (CH. ) MISCELLANEOUS SW1906 645 006 9673 SWITCH,PUSH 1P-1T (MENU) A100 610 289 2741 ASSY,PWB,MAIN A101 645 038 5827 TUNER,U/V 645 042 1976 TUNER,U/V A102 645 044 2513 BLOCK,SPECIAL(ANT)
  • Page 18: Cabinet Parts List

    DESCRIPTION 610 292 4701 CABINET FRONT 645 044 3176 ASSY,RC TRANSMITTER 645 044 3213 ASSY,RC TRANSMITTER 610 236 9267 SANYO BADGE 610 290 1221 RC-BATTERY COVER 610 275 1901 DEC SHEET 610 290 1283 RC-BATTERY COVER 610 275 1864 BUTTON UNITED...
  • Page 19: Component And Testpoint Locations

    COMPONENT AND TESTPOINT 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 4A 125V RECHANGE DE MEME TYPE 4A, 125V MAIN BOARD - Parts Side —...
  • Page 20 MAIN BOARD - Foil Side — 20 —...
  • Page 21 PICTURE TUBE SOCKET BOARD - Parts Side PICTURE TUBE SOCKET BOARD - Foil Side — 21 —...
  • Page 22 NOTES...
  • Page 23 NOTES...
  • 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 / 2770 SMC Printed in U.S.A.
  • Page 25: Schematic Diagrams

    MODEL AVM-1901S Chassis No. G6V-1901S0 WAVEFORMS BLOCK DIAGRAM SCHEMATIC DIAGRAMS Note: Voltages were measured with offset color-bar signal and controls adjusted for normal picture. NOTES ON SCHEMATIC DIAGRAM CAUTION FOR CONTINUED PROTECTION AGAINST A RISK 1. All resistance values in ohms K=1,000 M=1,000,000.
  • Page 26 MODEL AVM-1901S Chassis No. G6V-1901S0 BUILT IN ANTENNA SHIELD BOX IC501 IC501A LA7840 1AA2HEF0115-- A102 TUNER(WITH PLL & BAND SW) F42B01400 A101 F1BAM (0242:0250) IC501H2 2400010 IC501H1 2400010 R201 IC501H3 R517 TP16 L902 C106 L70273 (MRA:XRA) <RCA> C516 R518 R202...