Service Manuals, User Guides, Schematic Diagrams or docs for : Harman Kardon AVR AVR-255 & 230 AVR-255 & 230

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harman/kardon                                                  AVR 255/230 Service Manual




  harman/kardon                                   Service Manual


AVR 255/230
7 x 50W 7.1 CHANNEL A/V RECEIVER




                              CONTENTS

  ESD WARNING                    2     ELECTRICAL PARTS LIST                  9
  BASIC SPECIFICATIONS           3     SEMICONDUCTOR PINOUTS                 50
  TROUBLESHOOTING GUIDE          4     PCB DRAWINGS                         121
  PROCESSOR RESET                4     BLOCK DIAGRAM                        129
  REMOTE RESET                   5     WIRING DIAGRAM                       130
  PACKAGE LIST AND PARTS         6     AMP BIAS ADJUSTMENT                  131
  DISASSEMBLY                    7     SCHEMATIC DIAGRAMS                   132
  EXPLODED VIEW AND PARTS        8




Released EU2008                harman/kardon, Inc.        Rev 0, 07/2008
                             250 Crossways Park Dr.
                            Woodbury, New York, 11797
                                                                            Page 1 of 144
harman/kardon                                                                                                          AVR 255/230 Service Manual




 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.




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                                                                                                                                       Page 2 of 144
harman/kardon
                                                                                                                                            AVR 255/230 Service Manual
   Technical Specifications

   Audio Section                                                   FM Tuner Section
   Stereo Mode                                                           Frequency Range                                                         87.5

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