Service Manuals, User Guides, Schematic Diagrams or docs for : Harman Kardon AVR AVR-120 AVR-120

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               harman/kardon

                                            AVR120
             A/V DOLBY DIGITAL RECEIVER

                    SERVICE MANUAL




                                                     CONTENTS
ESD WARNING......................................2          TECH TIP HKTT2003-01.......................17
LEAKAGE TESTING.................................3           EXPLODED VIEW...............................18
BASIC SPECIFICATIONS.........................4              EXPLODED VIEW PARTS LIST.............19
FRONT PANEL CONTROLS.....................5                  BLOCK DIAGRAM...............................20
FRONT PANEL DISPLAY.........................7               ELECTRICAL PARTS LIST.....................21
REAR PANEL CONNECTIONS..................9                   PCB DRAWINGS.................................54
REMOTE CONTROL FUNCTIONS............11                      SEMICONDUCTOR PINOUTS...............57
TROUBLESHOOTING GUIDE.......................14              SCHEMATICS....................................100
PROCESSOR RESET............................14               PACKING..........................................118
BULLETIN HK2003-07............................15


                                               harman/kardon, Inc.
                                            250 Crossways Park Dr.
                                         Woodbury, New York 11797                              Rev3 6/2005
AVR120                                                                                                                           harman/kardon




  Some semiconductor (solid state) devices can be damaged easily by static electricity. Such components commonly are called

  Electrostatically Sensitive (ES) Devices. Examples of typical ES devices are integrated circuits and some field effect transistors and

  semiconductor "chip" components.

  The following techniques should be used to help reduce the incidence of component damage caused by static electricity.

  1. Immediately before handling any semiconductor component or semiconductor-equipped assembly, drain off any electrostatic charge on

    your body by touching a known earth ground. Alternatively, obtain and wear a commercially available discharging wrist strap device,

    which should be removed for potential shock reasons prior to applying power to the unit under test.

  2. After removing an electrical assembly equipped with ES devices, place the assembly on a conductive surface such as aluminum foil, to

    prevent electrostatic charge build-up or exposure of the assembly.

  3. Use only a grounded-tip soldering iron to solder or unsolder ES devices.

  4. Use only an anti-static solder removal device. Some solder removal devices not classified as "anti-static" can generate electrical charges

    sufficient to damage ES devices.

  5. Do not use freon-propelled chemicals. These can generate electrical change sufficient to damage ES devices.

  6. Do not remove a replacement ES device from its protective package until immediately before you are ready to install it. (Most replacement

    ES devices are packaged with leads electrically shorted together by conductive foam, aluminum foil or comparable conductive material.)

  7. Immediately before removing the protective material from the leads of a replacement ES device, touch the protective material to the

    chassis or circuit assembly into which the device will be installed.

   CAUTION : Be sure no power is applied to the chassis or circuit, and observe all other safety precautions.

  8. Minimize bodily motions when handling unpackaged replacement ES devices. (Otherwise harmless motion such as the brushing together

    or your clothes fabric or the lifting of your foot from a carpeted floor can generate static electricity sufficient to damage an ES devices.




  Each precaution in this manual should be followed during servicing.

  Components identified with the IEC symbol        in the parts list are special significance to safety. When replacing a component identified with

      , use only the replacement parts designated, or parts with the same ratings or resistance, wattage, or voltage that are designated in the

  parts list in this manual. Leakage-current or resistance measurements must be made to determine that exposed parts are acceptably

  insulated from the supply circuit before retuming the product to the customer.




                                                                                                                                                   2
AVR120                                                                                                                      harman/kardon




 Before returning the unit to the user, perform the following safety checks :




 1. Inspect all lead dress to make certain that

   leads are not pinched or that hardware is not

   lodged between the chassis and other metal

   parts in the unit.

 2. Be sure that any protective devices such as

   nonmetallic control knobs, insulating fish-

   papers, cabinet backs, adjustment and

   compartment covers or shields, isolation

   resistor-capacity networks, mechanical

   insulators, etc. Which were removed for the

   servicing are properly re-installed.

 3. Be sure that no shock hazard exists ; check for leakage

   current using Simpson Model 229 Leakage Tester, standard

   equipment item No. 21641, RCA Model WT540A or use

   alternate method as follows : Plug the power cord directly

   Into a 120 volt AC receptacle (do not use an Isolation

   Transformer for this test). Using two clip leads, connect a

   1500 ohms, 10watt Resistor paralleled by a 0.15uF capacitor, in series with all exposed metal cabinet parts and a known earth ground, such

   as a water pipe or conduit. Use a VTVM or VOM with 1000 ohms per volt, or higher sensitivity to measure the AC voltage drop across the

   resistor. (See diagram) Move the resistor connection to each exposed metal part having a return path to the chassis (antenna, metal,

   cabinet, screw heads, knobs and control shafts, escutcheon, etc.) and measure the AC voltage drop across the resistor. (This test should be

   performed with the 0.35 volt RMS or more is excessive and indicates a potential shock hazard which must be corrected before returning the

   unit to the owner.




                                                                                                                                            3
  AVR120                                                                                                                                          harman/kardon

Technical Specifications

Audio Section                                               FM Tuner Section
Stereo Mode                                                       Frequency Range                 87.5

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