Sanyo Dp50747

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  • SpecificationsPower Rating . . . . . . . . . . . . . . . . . . . . . . . . 120VAC

    460W, 4.6A (Max)Antenna Input Impedance . . . . . . . . . . . . . . . . . 75

    UHF/VHF/CATVDigital

    Receiving Channel . . . . . . . . . . . . . . . . 2 - 13 (VHF),14 - 69 (UHF),

    01, 14-94, 95-125 (CATV)1-99 (Digital)

    Remote Ready . . . . . . . . . . 32 Key Remote ControlSound Output . . . . . . . . . . . . . . . . . . . . . . 7.0 W/CHIntermediate Frequency

    Picture IF Carrier . . . . . . . . . . . . . . . . . . 45.75MHzSound IF Carrier . . . . . . . . . . . . . . . . . . 41.25MHzColor Sub Carrier . . . . . . . . . . . . . . . . . 42.17MHz

    Cabinet DimensionsWidth. . . . . . . . . . . . . . . . . . . . . . . . . . . . 1255mmHeight . . . . . . . . . . . . . . . . . . . . . . . . . . . . 846mmDepth including base . . . . . . . . . . . . . . . . 281mm

    REFERENCE No. SM780141DP50747, J4DE, PRODUCT CODE 111010304

    ContentsSafety Instructions . . . . . . . . . . . . . . . . . . 2Service Adjustments . . . . . . . . . . . . . 3 4Power Failure Circuit . . . . . . . . . . . . . . . . 5Mechanical Disassemblies. . . . . . . . 6 10Chassis Electrical Parts List . . . . . . 11 24Cabinet Parts List . . . . . . . . . . . . . . . . . . 25Component and Test Point

    Locations . . . . . . . . . . . . . . . . . . . 26 28Block Diagrams . . . . . . . . . . . . . . . . 29 40Troubleshooting Flow Charts . . . . . 41 43Control Port Functions. . . . . . . . . . . 44 45Schematic Notes . . . . . . . . . . . . . . . . . . . 46Pin Layouts. . . . . . . . . . . . . . . . . . . . . . . . 47Capacitor and Resistor Codes . . . . . . . . 48Schematic Diagrams . . . . . . . . . . . . 49 52

    ASFILE NO.

    SERVICE MANUAL Remote Control PlasmaColor Television

    DP50747 (U.S.A.)(CANADA)

    ORIGINAL VERSION

    Chassis No. P50747-00

    NOTE: Match the Chassis No. on the units back cover with the Chassis No. in theService Manual.

    If the Original VersionService Manual ChassisNo. does not match theunits, additional ServiceLiterature is required. Youmust refer to Notices to theOriginal Service Manualprior to servicing the unit.

    Servicing should be performed by only trained and qualified service personnel.

    with a double Z is a registered trademarkof Sanyo Manufacturing Corporation.

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    SAFETY PRECAUTIONSWARNING: The chassis of this receiver has a floatingground with the potential of one half the AC line voltage inrespect to earth ground. Service should not be attempted byanyone not familiar with the precautions necessary whenworking on this type of equipment. The following precautions must be observed:

    1. An isolation transformer must be connected in the powerline between the receiver and the AC line before any ser-vice is performed on the receiver.

    2. Comply with all caution and safety-related notes providedinside the cabinet, on the chassis, and on the back.

    3. When replacing a chassis in the cabinet, always be certainthat all the protective devices are installed properly, suchas control knobs, adjustment covers, shields and barriers.

    4. Before replacing the back cover of the set, thoroughlyinspect the inside of the cabinet to see that no stray partsor tools have been left inside.Before returning any television to the customer, the service technician must perform the following safetychecks to be sure that the unit is completely safe to operate without danger of electrical shock.

    ANTENNA COLD CHECKRemove AC plug from the 120 VAC outlet and place ajumper across the two blades. Connect one lead of an ohm-meter to the jumpered AC plug, and touch the other lead toeach exposed antenna terminal (UHF and VHF antenna ter-minals). The resistance must measure between 1M ohm and5.2M ohm. Any resistance value below or above this rangeindicates an abnormality which requires corrective action.

    LEAKAGE CURRENT CHECKPlug the AC line cord directly into a 120 VAC outlet. (Do notuse an isolation transformer for this check.) Use an AC volt-meter, that has 5000 ohms per volt or more sensitivity.Connect a 1500 ohm 10 watt resistor, paralleled by a 0.15 F150 VAC capacitor, between a known good earth ground(water pipe, conduit, etc.) and all exposed metal parts of thecabinet (antennas, handle bracket, metal cabinet, screwheads, metal overlays, control shafts, etc.). Measure the ACvoltage across the 1500 ohm resistor. The AC voltageshould not exceed 750 mV. A reading exceeding 750 mVindicates that a dangerous potential exists. The fault mustbe located and corrected. Repeat the above test with thereceiver power plug reversed.

    NEVER RETURN A RECEIVER TO THE CUSTOMER WITHOUT TAKING THE NECESSARY CORRECTIVE ACTION.

    PRODUCT SAFETY NOTICEWhen replacing components in a receiver, always keep inmind the necessary product safety precautions. Pay specialattention to the replacement of components marked with a

    in the parts list and in the schematic diagrams. To ensuresafe product operation, it is necessary to replace those com-ponents with the exact same PARTS.

    SERVICING ELECTROSTATICALLY SENSATIVE DEVICESSemiconductors (solid-state devices) that can be damagedby static electricity are referred to as ElectrostaticallySensitive (ES) devices. Examples of typical ES devices are:Integrated Circuits (IC), Field-Effect Transistors (FET), andchip components. The following techniques should beobserved strictly, to reduce the occurrence of semiconduc-tor damage due to electrostatic discharge.

    1. Immediately prior to handling any semiconductor com-ponent or an assembly containing a semiconductordevice or devices, discharge the electrostatic buildup onyour body by touching a known earth ground. You mayalso obtain and wear a commercially available discharg-ing wrist strap device.

    CAUTION: Be sure to remove the wrist strap beforeapplying power to any unit being serviced.

    2. After removing an ES equipped assembly, place it on aconductive surface, such as, aluminum foil, to preventbuildup or exposure to static electricity.

    3. Use only grounded-tip soldering irons to solder or unsol-der ES devices.

    4. Use only anti-static solder removal devices. Some suc-tion-type devices can generate static electricity adequateto damage ES devices.

    5. A replacement ES device will come packaged in protectivematerial (conductive foam, aluminum foil, or some compa-rable conductive material). Do Not remove an ES devicefrom its protective packaging unless you are prepared toinstall it immediately.

    6. Precisely prior to removing an ES device from its protectivepackaging, touch the protective packaging to the chassis or assembly in which the device will be installed.

    CAUTION: Be sure that no power is applied to the chassis orcircuit assembly.

    7. Incidental body movements, such as, lifting a foot from acarpeted floor or the rubbing of fabric together can gener-ate static electricity sufficient to damage ES devices.Therefore, minimize all body movements while handlingexposed (unpackaged) ES devices.

    0.15 F 150V AC

    1500 ohm10 watt

    Good earth groundsuch as a water pipe,conduit, etc.

    AC OUTLET

    TELEVISIONRECEIVER

    READING SHOULD NOT EXCEED 750 mV.AC VOLTMETER

    (5000 ohms per volt or more sensitivity)

    To be touched to all of exposed metal parts.Voltmeter Hook-up for Leakage Current Check.

    SAFETY INSTRUCTIONS

  • 14 5 6

    7 8

    0

    9

    2 3POWER

    INPUT

    INFO

    RECALL

    MENU

    CAPTION EXIT

    VOL

    RESET AUDIO PIX SHAPE

    CH

    ENTER

    1-- MUTE

    SLEEP

    3

    SERVICE ADJUSTMENTS

    Volume + / :Adjust Service Menu

    Channel :Select Item

    GENERALThis set has an On-screen Service Menu system included inthe CPU that allows remote operation for most of the ser-vice adjustments.

    ON-SCREEN SERVICE MENU SYSTEM1. Enter the Service Menu:

    Turn off the receiver and disconnect the AC powersupply. Leave unplugged for at least one minute.

    While pressing the Volume () button on the televi-sion, reconnect the AC power supply. The ServiceMenu will now appear. The remote can now be usedto make adjustments. See Figure 1 below.

    2. Service Adjustments:

    Press the Channel or key to select the desiredservice menu item you want to adjust. See page 4for the On-screen Service Menu.

    Use the Volume + or key to adjust the data.The + or keys will increase or decrease the datasequentially.

    3. Exit from the Service Menu:

    Press the MENU key to turn off the Service Menudisplay.

    Figure 1. Service Menu Display

    HEX DATA

    V e r 0 5 10 8 6 V O L3 0

    ITEM NO. TITLE

    Volume : Enter Service Menu

    Menu:Exit Service Menu

  • 4

    ON-SCREEN SERVICE MENU

    Table 1. ON-SCREEN SERVICE MENUWhen IC802 (EEPROM) is replaced, check the bus data to confirm they are the same as below. See page 3 for On-Screen Service Menu access and adjustments.

    PROGRAM CODESThe microprossesor used in this model is a multi-purpose type and is used in several different models. To ensure proper operation and the correct features for your particular model, the program codes must be correct.

    Note 1. Option Data 1 (NO. 087 OPT) should be hexadeci-mal 18. See 087 above. If this program code is wrong theTV will not operate properly.

    Note 2. Option Data 2 (NO. 088 OP2) should be hexadeci-mal 14. See 088 above. If this program code is wrong theTV will not operate properly.

    086 VOL 30h Volume setup inspection087 OP1 18h Option 1 Data088 OP2 14h Option 2 Data

    101 1R00 00h ROM Correction Data102 1R02 00h ROM Correction Data

    197 2R47 00h ROM Correction Data198 2R48 00h ROM C