HarmanKardon-AVR225-avr-sm维修电路原理图.pdf

harman/kardon AVR225 AVR225 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.9 REMOTE CONTROL FUNCTIONS.11 INSTALLATION AND CONNECTIONS.14 TROUBLESHOOTING GUIDE.16 MICROPROCESSOR RESET.16 UNIT EXPLODED VIEW.17 DISASSEMBLY PROCEDURE.18 AMPLIFIER BIAS ADJUSTMENT.21 TECH TIP HKTT2004-03.22 TECH TIP HKTT2003-01.26 BLOCK DIAGRAM.27 IC PINOUTS.28 TRANSISTOR PINOUTS.64 ELECTRICAL PARTS LIST.65 PCB DRAWINGS.75 SCHEMATICS.83 WIRING DIAGRAM.95 PACKAGING.96 harman/kardon, Inc. 250 Crossways Park Dr. Woodbury, New York 11797 Rev5 8/2005 www.freeservicemanuals.infoIts Freewww.freeservicemanuals.infoRadioFans.CN 收音机爱 好者资料库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 theparts list in this manual. Leakage-current or resistance measurements must be made to determine that exposed parts are acceptablyinsulated 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 calledElectrostatically Sensitive (ES) Devices. Examples of typical ES devices are integrated circuits and some field effect transistors andsemiconductor 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 onyour 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, toprevent 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 chargessufficient 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 replacementES 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 thechassis 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 togetheror your clothes fabric or the lifting of your foot from a carpeted floor can generate static electricity sufficient to damage an ES devices.CAUTION :AVR225AVR225 harman/kardon harman/kardon www.freeservicemanuals.infoIts Freewww.freeservicemanuals.infoRadioFans.CN 收音机爱 好者资料库SAFETY PRECAUTIONSThe following check should be performed for the continuedprotection of the customer and service technician.LEAKAGE CURRENT CHECKMeasure leakage current to a known earth ground (waterpipe, conduit, etc.) by connecting a leakage current testerbetween the earth ground and all exposed metal parts of theappliance (input/output terminals, screwheads, metaloverlays, control shaft, etc.). Plug the AC line cord of theappliance directly into a 120V AC 60Hz outlet and turn theAC power switch on. Any current measured must not exceedo.5mA.ANY MEASUREMENTS NOT WITHIN THE LIMITSOUTLINED ABOVE ARE INDICATIVE OF APOTENTIAL SHOCK HAZARD AND MUST BECORRECTED BEFORE RETURNING THE APPLIANCETO THE CUSTOMER.DeviceundertestTest allexposed metalsurfacesAlso test withplug reversed(Using AC adapterplug as required)AC Leakage TestLeakagecurrenttesterReading shouldnot be above0.5mAEarthgroundAVR225AVR225 harman/kardon harman/kardon www.freeservicemanuals.infoIts Freewww.freeservicemanuals.infoAudio SectionStereo Mode Continuous Average Power (FTC)70 Watts per channel, 0.07% THD, 20Hz 20kHz,both channels driven into 8 ohmsFive-Channel Surround Modes Power Per Individual ChannelFront L&R channels:60 Watts per channel 0.07% THD, 20Hz20kHz into 8 ohmsCenter channel:60 Watts 0.07% THD, 20Hz20kHz into 8 ohmsSurround channels:60 Watts per channel 0.07% THD, 20Hz20kHz into 8 ohmsInput Sensitivity/ImpedanceLinear (High-Level)200mV/47k ohmsSignal-to-Noise Ratio (IHF-A)95dBSurround System Adjacent Channel SeparationAnalog Source Decoding 45dBDolby Digital 55dBDTS55dBFrequency Response 1W (+0dB, 3dB)10Hz100kHzHigh Instantaneous Current Capability (HCC)28 AmpsTransient Intermodulation Distortion (TIM)UnmeasurableSlew Rate40V/secFM Tuner SectionFrequency Range87.5108.0MHzUsable SensitivityIHF 1.3 V/13.2dBfSignal-to-Noise RatioMono/Stereo 70dB/68dBDistortionMono/Stereo 0.2%/0.3%Stereo Separation40dB 1kHzSelectivity400kHz, 70dBImage Rejection80dBIF Rejection90dBAM Tuner SectionFrequency Range5201720kHzSignal-to-Noise Ratio45dBUsable SensitivityLoop 500VDistortion1kHz, 50% Mod 0.8%Selectivity10kHz, 30dBVideo SectionTelevision FormatNTSCInput Level/Impedance1Vp-p/75 ohmsOutput Level/Impedance1Vp-p/75 ohmsVideo Frequency Response10Hz8MHz (3dB)GeneralPower RequirementAC 120V/60HzPower Consumption68W idle, 540W maximum (2 channels driven)Dimensions (Max)Width17.3 inches (440mm)Height 6.6 inches (168mm)Depth 15.4 inches (390mm)Weight 26.9 lb (12.2kg)Depth measurement includes knobs, buttons and terminal connections.Height measurement includes feet and chassis.All features and specifications are subject to change without notice.*See the following trademark acknowledgements:Harman Kardon and Power for the Digital Revolution are registered trademarks of Harman Kardon, Inc.is a trademark of Harman International Industries, Inc. (patent no. 5,386,478).Manufactured under license from Dolby Laboratories. Dolby, Pro Logic and the Double-Dsymbol are registered trademarks of Dolby Laboratories. Confidential Unpublished Works.19921999 Dolby Laboratories, Inc. All rights reserved.“DTS” and “DTS Digital Surround” are trademarks of Digital Theater Systems, Inc.UltraStereo is a trademark of UltraStereo Corp.VMAx is a registered trademark of Harman International Industries, Inc., and is an implementation of Cooper Bauck Transaural Stereo under patent license.Logic 7 is a registered trademark of Lexicon, Inc., a Harman International Company,and Harman International Industries, Inc.Crystal is a registered trademark of Cirrus Logic Corp.TMSPECIFICATIONSAVR225AVR225 harman/kardon harman/kardon www.freeservicemanuals.infoIts Freewww.freeservicemanuals.infoFRONT-PANEL CONTROLS 51 Main Power Switch: Press this button to applypower to the AVR 225. When the switch is pressedin, the unit is placed in a Standby mode, as indicatedby the amber LED 3 surrounding the SystemPower Control 2. This button MUST be pressed into operate the unit. To turn the unit off and preventthe use of the remote control, this switch should bepressed until it pops out from the front panel so thatthe 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 PowerSwitch 1 is “ON,” press this button to turn on theAVR 225; press it again to turn the unit off. Note thatthe Power Indicator 3 surrounding the switch willturn green when the unit is on.3 Power Indicator: This LED will be illuminated inamber when the unit is in the Standby mode to signalthat the unit is ready to be turned on.When the unit is in operation, the indicator will turn green. Should the indicator turn red, turn the unit off using the Main Power Switch 1 and check the speaker wire connections to make certain that there are noshort circuits.4 Headphone Jack: This jack may be used to listento the AVR 225s output through a pair of headphones.Be certain that the headphones have a standard 1/4stereo phone plug. Note that the main room speakerswill automatically be turned off when the headphonejack is in use.5 Selector Buttons: When you are establishing theAVR 225s configuration settings,use these buttons toselect from the choices available,as shown in the MainInformation Display .6 Tone Mode: Pressing this button enables or dis-ables the Bass and Treble tone controls.When thebutton is pressed so that the words TONE INappear in the Main Information Display , thesettings of the Bass & and Treble ( controls maybe used to adjust the output signals.When the buttonis pressed so that the words TONE OUT appearin the Main Information Display , the output sig-nal will be “flat, ” without any bass or treble alteration,no matter how the actual Bass and Treble Controls&( are adjusted.7 Surround Mode Selector: Press this button tochange the surround mode by scrolling through the listof available modes. Note that depending on the typeFRONT-PANEL CONTROLS1 Main Power Switch2 System Power Control3 Power Indicator4 Headphone Jack5 Selector Buttons6 Tone Mode7 Surround Mode Selector8 Tuning Selector9 AM/FM Selector) Preset Stations Selector! Input Source Selector Tuning Mode Selector# Digital Optical 3 Input$ Digital Coax 3 Jack% Video 4 Video Input Jacks Video 4 Audio Input Jacks& Bass Control* Balance Control( Treble Control Volume Control Set Button Input Indicators Delay Digital Input Selector Main Information Display Channel Select Button Speaker Select Button Test Tone Selector Surround Mode Indicators Remote Sensor Window43789)!#$%*&(296305AVR 225Tun ModeAM/FM21dBAVR225AVR225 harman/kardon harman/kardon www.freeservicemanuals.infoIts Freewww.freeservicemanuals.info6FRONT-PANEL CONTROLSFRONT-PANEL CONTROLSof input, some modes are not always available. (Seepage 25 for more information about surround modes.)8 Tuning Selector: Press the left side of the buttonto tune lower-frequency stations and the right side ofthe button to tune higher-frequency stations.When astation with a strong signal is reached, the TunedIndicator Q will be illuminated in the MainInformation Display .In Manual tuning mode, tap the button lightly and notethat the tuner will step up one frequency increment perbutton press.When the button is held for a few sec-onds you will note that the unit will quickly advancethrough the frequency band. Release it and the tunerwill stop. In Auto tuning mode, each press of the but-ton will search for the next station with an acceptablesignal. Press and hold the button to skip through theacceptable stations.When the button is released, thetuner will not stop until it reaches a station with anacceptable frequency.To switch back and forth between the Auto andManual tuning modes, press the Tuning ModeSelector .9 AM/FM Selector: Pressing this button will auto-matically switch the AVR 225 to the Tuner mode.Pressing it again will switch between the AM and FMfrequency bands. (See page 28 for more informationon the tuner.) Preset Stations Selector: Press this button toscroll up or down through the list of stations that havebeen entered into the preset memory. (See page 28for more information on tuner presets.)! Input Source Selector: Press this button tochange the input by scrolling up or down through thelist of input sources. Tuning Mode Selector: Press this button to selectAuto or Manual tuning.When the button is pressed sothat the Auto Indicator R lights, the tuner will searchfor the next station with an acceptable signal when theTuning Selector 8u is pressed.When the buttonis pressed so that the Auto Indicator R is not lit,each press of the Tuning Selector 8u willincrease the frequency.This button may also be used toswitch between Stereo and Mono modes for FM radioreception.When weak reception is encountered, pressthe button until the Stereo Indicator P goes out toswitch to Mono reception. Press and hold again toswitch back to Stereo mode. (See page 28 for moreinformation on using the tuner.)# Digital Optical 3 Input: Connect the optical digitalaudio output of an audio or video product to this jack.When the input is not in use, be certain to keep theplastic cap installed to avoid dust contamination thatmight degrade future performance.$ Digital Coax 3 Jack: This jack is used for con-nection to the output of portable audio devices, videogame consoles or other products that have a coaxdigital audio jack.% Video 4 Video Input Jacks: These jacks may be used for temporary connection to the composite orS-Video output of video games, camcorders or otherportable video products. Video 4 Audio Input Jacks: These audio jacksmay be used for temporary connection to videogames or portable audio/video products such as camcorders and portable audio players.& Bass Control:Turn this control to modify the low-frequency output of the left/right channels by as much as10dB,when the unit is in the “Surround Off”mode.Setthis control to a suitable position for your taste or roomacoustics.* Balance Control: Turn this control to change therelative volume for the front left/right channels.NOTE: For proper operation of the surround modesthis control should be at the midpoint or “12 oclock”position.(Treble Control:Turn this control to modify the high-frequency output of the left/right channels by as much as10dB,when the unit is in the “Surround Off”mode.Setthis control to a suitable position for your taste or roomacoustics. Volume Control: Turn this knob clockwise toincrease the volume, counterclockwise to decrease the volume. If the AVR 225 is muted, adjusting theVolume Control will automatically release the unit from the silenced condition. Set Button: When making choices during thesetup and configuration process, press this button toenter the desired setting as shown in the Main Infor-mation Display into the AVR 225s memory.TheSet button may also be used to change the displaybrightness (see page 30). Input Indicators: A green LED will light in front ofthe input that is currently being used as the source forthe AVR 225. Delay: Press this button to begin the sequenceof steps required to enter delay time settings. (Seepage 18 for more information on delay times.) Digital Input Selector: When playing a sourcethat has a digital output, press this button to selectbetween the Optical #e and Coaxial $bdigital inputs or to select the sources analog input.(See pages 2628 for more information on digitalaudio.) Main Information Display: This display deliversmessages and status indications to h