HarmanKardon-AVR8000-avr-sm维修电路原理图.pdf

harman/kardon AVR8000 AVR8000 A/V DOLBY DIGITAL RECEIVER SERVICE MANUAL CONTENTS ESD WARNING.2 LEAKAGE TESTING.3 BASIC SPECIFICATIONS.4 FRONT PANEL CONTROLS.5 FRONT PANEL DISPLAY.7 REAR PANEL CONNECTIONS.8 REMOTE CONTROL FUNCTIONS.10 TROUBLESHOOTING GUIDE.14 PROCESSOR RESET.14 BULLETIN HK2002-04.15 BULLETIN HK2004-01.17 TECH TIP HKTT2002-02.19 TECH TIP HKTT2003-01.22 DC OFFSET ADJUSTMENT23 EXPLODED VIEW.24 EXPLODED VIEW PARTS LIST.27 DISASSEMBLY TIPS.29 REPLACING IC701.36 ELECTRICAL PARTS LIST.37 BLOCK DIAGRAM120 PCB DRAWINGS.121 SEMICONDUCTOR PINOUTS.156 SCHEMATICS.208 WIRING DIAGRAM.241 PACKING.242 harman/kardon, Inc. 250 Crossways Park Dr. Woodbury, New York 11797 Rev10 7/2005 RadioFans.CN Eachprecautioninthismanualshouldbefollowedduringservicing. Components identified with the IEC symbolin 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. 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. 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. CAUTION : AVR8000 AVR8000 harman/kardon RadioFans.CN 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 partsintheunit. 2. Be sure that any protective devices such as nonmetallic control knobs, insulating fish- papers,cabinetbacks,adjustmentand compartment covers or shields, isolation resistor-capacitynetworks,mechanical insulators, etc. Which were removed for the servicingareproperlyre-installed. Before returning the unit to the user, perform the following safety checks : 3. Be sure that no shock hazard exists ; check for leakage currentusingSimpsonModel229LeakageTester,standard equipment item No. 21641, RCA Model WT540A or use alternate method asfollows : 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 1500ohms,10wattResistorparalleledbya0.15uFcapacitor,inserieswithallexposedmetalcabinetpartsandaknownearthground,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,screwheads,knobsandcontrolshafts,escutcheon,etc.)andmeasuretheACvoltagedropacrosstheresistor.(Thistestshouldbe performedwiththe0.35voltRMSormoreisexcessiveandindicatesapotentialshockhazardwhichmustbecorrectedbeforereturningthe unittotheowner. AVR8000 AVR8000 harman/kardon harman/kardon 3 RadioFans.CN 4 TECHNICAL SPECIFICATIONS Technical Specifications Audio Section Stereo Mode Continuous Average Power (FTC) 125 Watts per channel, 20Hz20kHz, < 0.07% THD, both channels driven into 8 ohms Five-Channel Surround Modes Power Per Individual Channel Front L 5,638,074; 5,640,161; 5,808,574; 5,838,274; 5,854,600; 5,864,311; 5,872,531; and in Australia: 669114. Other patents pending. TM AVR8000 AVR8000 harman/kardon harman/kardon 5 FRONT PANEL CONTROLS 1 Main Power Switch: Press this button to apply power to the AVR 8000.When the switch is pressed in, the unit is placed in a Standby mode, as indicated by the amber Power Indicator 3 surrounding the System Power Control 2.This button MUST be pressed in to operate the unit.To turn the unit off and prevent the use of the remote control, this switch should be pressed until it pops out from the front panel so that the word “OFF” may be read at the top of the switch. NOTE: This switch is normally left in the “ON” position. 2 System Power Control:When the Main Power Switch 1 is “ON,” press this button to turn on the AVR 8000; press it again to turn the unit off. Note that the Power Indicator 3 surrounding the switch will turn green when the unit is on. 3 Power Indicator: This LED will be lit in amber when the unit is in the Standby mode to signal that the unit is ready to be turned on. When the unit is in operation, the indicator will turn green. 4 Headphone Jack:This jack may be used to listen to the AVR 8000s output through a pair of headphones. Be certain that the headphones have a standard 1/4 stereo phone plug. Note that the main room speakers will automatically be turned off when the headphone jack is in use. 5 Dolby Mode Selector: Pressing this selector button cycles the AVR through the various Dolby surround modes.The first press of the button switches the surround mode to the last Dolby surround mode that was in use. The choice of modes available will vary based on the type of input source (digital or analog) and the number of speaker channels your system is configured for. 6 Home THX Mode Selector: Press this button to select Home THX processing.The choice of THX modes will vary according to the type of input source and program material (Dolby Digital, DTS 5.1, DTS 6.1 or analog), and the number of speakers in your system. In some cases the system will auto-default to the THX Surround EX or THX Cinema mode, while in other cases you will have a choice of modes. 7 Logic 7 Mode Selector/Button: This button has two functions: In normal use, press it to select one of the Logic 7 modes.When an adjustment is being made using using the Front Panel Controls 1 Main Power Switch 2 System Power Control 3 Power Indicator 4 Headphone Jack 5 Dolby Mode Selector 6 Home THX Mode Selector 7 Logic 7 Mode Selector/Button 8 Tone Mode 9 DSP Surround Mode Selector ) Tuning Selector ! Tuner Band Selector 6Ch/8Ch Direct Button # Preset Station Selector $ Stereo Mode Selector/Button % Input Source Selector FM Mode Selector the tuner will automatically scan for the next station with an acceptable signal and then stop. ! Tuner Band Selector: Pressing this but- ton will automatically switch the AVR 8000 to the Tuner mode. Pressing it again will switch between the AM and FM frequency bands. (See page 33 for more information on the tuner.) 6Ch/8Ch Direct Button: Press this button to select the 6-Channel Direct or 8-Channel Direct inputs as the AVR 8000s source. # Preset Station Selector: Press this button to scroll up or down through the list or stations that have been entered into the preset memory. (See pages 33 and 34 for more infor- mation on tuner programming.) $ Stereo Mode Selector/Button: Pressing this selector button cycles through the stereo modes, and it is also used to turn off all surround processing and place the unit in a tra- ditional two-channel Stereo mode.The first press selects 5-Channel Stereo, the next press selects 7-Channel Stereo, and the third press selects “SURROUND OFF,” which is true Stereo. % Input Source Selector: Press this button to change the input by scrolling up or down through the list of input sources. FM Mode Selector: Press this button to select Auto or Manual tuning.When the button is pressed so that the AUTO Indicator J lights, the tuner will search for the next station with an acceptable signal when the Tuning Selector )uis pressed.When the but- ton is pressed so that the AUTO Indicator J is not lit, each press of the Tuning Selector )uwill increase the frequency. (See page 33 for more information on using the tuner.) NOTE:The front panel digital audio, video and analog audio input and output jacks are nor- mally concealed behind a drop-down door in the lower right corner of the front panel.To access these jacks, open the panel door by gently pulling down the upper right corner of the door as indicated by “PULL/OPEN.” Amplifier is in protection mode Check speaker wire connections for shorts at receiver and light around power switch is reddue to possible shortspeaker ends Amplifier is in protection mode Contact your local Harman Kardon service center due to internal problems No sound from surround or Incorrect surround mode Select a mode other than Stereo center speakers Input is monaural There is no surround information from mono sources Incorrect configuration Check speaker mode configuration Stereo or Mono program material The surround decoder may not create center- or rear-channel information from nonencoded programs Unit does not respond to Weak batteries in remote Change remote batteries remote commands Wrong device selected Press the AVR selector Remote sensor is obscured Make certain front panel sensor is visible to remote or connect remote sensor Intermittent buzzing in tuner Local interference Move unit or antenna away from computers, fluorescent lights, motors or other electrical appliances Letters flash in the channel indicator Digital audio feed paused Resume play for DVD display and digital audio stops Check that Digital Input is selected Processor Reset In the rare case where the units operation or the displays seem abnormal, the cause may involve the erratic operation of the systems memory or microprocessor. To correct this problem, first unplug the unit from the AC wall outlet and wait at least three minutes. After the pause, reconnect the AC power cord and check the units operation. If the system still malfunctions, a system reset may clear the problem. To clear the AVR 8000s entire system memory including tuner presets, output level settings, delay times and speaker configuration data, first put the unit in Standby by pressing the System Power Control Button 2. Next, press and hold the Tone Mode 8 and the FM Mode Selector buttons for three seconds. The unit will turn on automatically and display the RESET message in the Main Information Display . Note that once you have cleared the memory in this manner, it is necessary to reestablish all system configuration settings and tuner presets. NOTE: Resetting the processor will erase any configuration settings you have made for speakers, output levels, surround modes, digital input assignments as well as the tuner presets. After a reset the unit will be returned to the factory presets, and all settings for these items must be reentered. If the system is still operating incorrectly, there may have been an electronic discharge or severe AC line interference that has corrupted the memory or microprocessor. If these steps do not solve the problem, consult an authorized Harman Kardon service center. 14 TROUBLESHOOTING GUIDE Troubleshooting Guide AVR8000 AVR8000 harman/kardon harman/kardon harman/kardon Service Bulletin Service bulletin # H/K2002-04 April 2002Warranty labor rate: MINOR repair To: All harman/kardon Service Centers Model: AVR8000 Subject: Idle Current Adjustment Procedure In the event you receive an AVR8000 with the complaint “The receiver is overheating, or the protection circuit is engaging, or intermittently shutting down after the unit warms up” the DC idle current should be checked and adjusted as described below. Top cover may feel abnormally hot to the touch. Synopsis: Set DC idle current of output devices by adjusting five potentiometers Specialized equipment/parts needed: Variable AC transformer (“Variac” type) to adjust and monitor AC line voltage. Two pin harness plug to connect DMM to idle current test points. Order hk part# 55212910NR. Note: Unit that no longer functions when cool may have damaged components: output transistors, resistors, diodes, etc, in the output stage which must be replaced before performing adjustment so protection circuit is not activated. 1) Unplug any external connected cables to the AVR8000. 2) Remove the top cover, (18) black Phillips screws. 3) Locate the five idle current-current adjustment potentiometers (see illustration page 2). Facing the front of the AVR8000, they are located on the left and right sides of the unit along the top of the vertical PCBs. They are also marked on the PCBs “Idle-Adj.” 4) The white 2 pin Connectors (test points) and their related adjustment pots are referenced below. First, with the unit turned OFF, adjust with a small screwdriver so that all idle current pots are “centered”. Test Point (Check with DMM)Adjust Idle current Pot CP903Affected byVR902 CP904Affected byVSR902 CP922Affected byVC902 CP923Affected byVL902 CP924Affected byVSL902 Do not confuse the idle current adjustments with the DC offset adjustment pots which are located directly adjacent to them ! 5) Replace the top cover (no screws); turn unit ON. Unit should be connected to a “Variac” type (variable transformer) adjusted to 120VAC. Let receiver idle with no load, no signal input, and volume control at minimum (full CCW), for five minutes to stabil