Service Manuals, User Guides, Schematic Diagrams or docs for : Harman Kardon AVR AVR-325 AVR-325
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harman/kardon
AVR325
A/V DOLBY DIGITAL RECEIVER
SERVICE MANUAL
CONTENTS
ESD WARNING......................................2 TECH TIP HKTT2003-01......................22
LEAKAGE TESTING.................................3 EXPLODED VIEW...............................23
BASIC SPECIFICATIONS.........................4 EXPLODED VIEW PARTS LIST.............24
FRONT PANEL CONTROLS.....................5 AMPLIFIER BIAS ADJUSTMENT............27
FRONT PANEL DISPLAY.........................7 BLOCK DIAGRAM...............................31
REAR PANEL CONNECTIONS..................8 ELECTRICAL PARTS LIST....................32
REMOTE CONTROL FUNCTIONS.............11 PCB DRAWINGS................................83
INSTALLATION AND CONNECTIONS........14 SEMICONDUCTOR PINOUTS...............95
TROUBLESHOOTING GUIDE.................... 17 SCHEMATICS...................................156
PROCESSOR RESET.............................17 WIRING DIAGRAM................... ..........175
SERVICE BULLETIN # H/K2003-05...........18 PACKAGE........................................176
SERVICE BULLETIN # H/K2004-04...........19
harman/kardon, Inc.
250 Crossways Park Dr.
Woodbury, New York 11797 Rev3 9/2006
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AVR325 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.
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AVR325 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.
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AVR325 harman/kardon
AVR 325 TECHNICAL SPECIFICATIONS
Audio Section AM Tuner Section
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