HarmanKardon-AVR235-avr-sm维修电路原理图.pdf

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1、 harman/kardon AVR235 AVR235 7 X 50W 7.1 CHANNEL A/V RECEIVER SERVICE MANUAL CONTENTS ESD WARNING.2 LEAKAGE TESTING.3 BASIC SPECIFICATIONS.4 FRONT PANEL CONTROLS.5 REAR PANEL CONNECTIONS.7 REMOTE CONTROL FUNCTIONS.10 CONNECTIONS.14 OPERATION.16 TROUBLESHOOTING GUIDE.23 PROCESSOR RESET.23 DISASSEMBLY

2、.24 UNIT EXPLODED VIEW.27 AMP BIAS ADJUSTMENT.28 TECH TIP HK2003-01.29 BLOCK DIAGRAM.30 ELECTRICAL PARTS LIST.31 SEMICONDUCTOR PINOUTS.68 PCB DRAWINGS.109 SCHEMATICS115 WIRING DIAGRAM.121 PACKAGING.122 harman/kardon, Inc. 250 Crossways Park Dr. Woodbury, New York 11797 Rev0 4/2005 www.freeserviceman

3、uals.infoIts Free www.freeservicemanuals.info RadioFans.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

4、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

5、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

6、. 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. Al

7、ternatively, 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

8、 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 cha

9、rges 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

10、 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 t

11、he 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

12、your foot from a carpeted floor can generate static electricity sufficient to damage an ES devices. CAUTION : AVR235 AVR235 harman/kardon www.freeservicemanuals.infoIts Free www.freeservicemanuals.info RadioFans.CN 收音机爱 好者资料库 2 SAFETY PRECAUTIONS The following check should be performed for the conti

13、nued protection of the customer and service technician. LEAKAGE CURRENT CHECK Measure leakage current to a known earth ground (water pipe, conduit, etc.) by connecting a leakage current tester between the earth ground and all exposed metal parts of the appliance (input/output terminals, screwheads,

14、metal overlays, control shaft, etc.). Plug the AC line cord of the appliance directly into a 120V AC 60Hz outlet and turn the AC power switch on. Any current measured must not exceed o.5mA. ANY MEASUREMENTS NOT WITHIN THE LIMITS OUTLINED ABOVE ARE INDICATIVE OF A POTENTIAL SHOCK HAZARD AND MUST BE C

15、ORRECTED BEFORE RETURNING THE APPLIANCE TO THE CUSTOMER. Device under test Test all exposed metal surfaces Also test with plug reversed (Using AC adapter plug as required) AC Leakage Test Leakage current tester Reading should not be above 0.5mA Earth ground AVR235 harman/kardonAVR235 harman/kardon w

16、ww.freeservicemanuals.infoIts Free www.freeservicemanuals.info RadioFans.CN 收音机爱 好者资料库 TECHNICAL SPECIFICATIONS 51 Audio Section Stereo Mode Continuous Average Power (FTC) 65 Watts per channel, 20Hz20kHz, 0.07% THD, both channels driven into 8 ohms Seven-Channel Surround Modes Power per Individual C

17、hannel Front L press it again to turn the unit off.The Power Indicator 3 turns blue when the unit is on. 4 Headphone Jack: This jack may be used to listen to the AVR 235s output through a pair of headphones. The speakers will automatically be turned off when the headphone jack is in use. 5 Tone Mode

18、: Pressing this button enables or dis- ables the Bass and Treble tone controls.When the but- ton is pressed so that TONE IN appears in the Lower Display Line , the Bass and Treble controls may be used to adjust the output signals. When the button is pressed once or twice so that the words TONE OUT a

19、ppear in the Lower Display Line , the output signal will be “flat, ” no matter how the actual Bass and Treble Controls are adjusted. 6 Speaker Select Button: Press this button to begin the process of configuring the unit to match the type of speakers used in your listening room. (See pages 16 and 20

20、22 for more information on speaker setup and configuration.) 7 Surround Mode Group Selector: Press this but- ton to select the top-level group of surround modes. Each press of the button will select the current or last used mode in each of the surround mode groups (e.g., Dolby, DTS, DTS Neo:6, Logic

21、 7, DSP, Stereo). When the button is pressed so that the name of the desired surround mode group appears in the on- screen display and in the Lower Display Line , press the Surround Mode Selector 8 to cycle through the individual modes available. For example, press this button to select Dolby modes,

22、 and then press the Surround Mode Selector 8 to choose from the various mode options. 1 Main Power Switch 2 Power Indicator 3 Standby/On Switch 4 Headphone Jack 5 Tone Mode 6 Speaker Selector 7 Surround Mode Group Selector 8 Surround Mode Selector 9 Tuning Selector )/Buttons ! Tuner Band Selector Se

23、t Button # Digital Input Selector $ Preset Stations Selector % Delay Adjust Selector Input Source Selector the Sleep indicator numbers will disappear and the words SLEEP OFF will appear in the Lower Display Line . When you will be away from home for an extended period of time, it is always a good id

24、ea to completely turn the unit off with the front-panel Main Power Switch 1. NOTE: All preset memories are lost if the unit is left turned off by using the Main Power Switch 1 for more than four weeks. Source Selection To select a source, press any of the Input Selector Buttons eg on the remote. The

25、 input source may also be changed by pressing the front-panel Input Source Selector Button . Each press of the button will move the input selec- tion through the list of available inputs. As the input is changed, the AVR 235 will automati- cally switch to the digital input (if selected), surround mo

26、de, speaker configuration, output levels, crossover frequency and night mode status that were entered during the configuration process for that source. The front-panel Video 4 Inputs , Optical 3 Digital Input * or the Coaxial 3 Digital Input ( may be used to connect a device such as a video game or

27、camcorder to your home entertainment system on a temporary basis. As the input source is changed, the new input name will appear momentarily as an on-screen display in the lower third of the video display.The input name will also appear in the Upper Display Line and in the front-panel Input Indicato

28、rs . When an audio source is selected, the last video input used remains routed to the Video 1/Video 2 Video Outputs ehandVideo and S-Video Monitor Outputs j.This permits simultaneous viewing and listening to different sources.This also allows you to choose a video source and then select the 6/8-Cha

29、nnel Direct Inputs g as the audio source. When a composite or S-Video source is selected,the video signal for that input will be routed to the S-Video Monitor Outputand will be viewable on a TV monitor connected to the AVR 235. 6-Channel/8-Channel Direct Input There are two input choices available f

30、or use with sources such as a DVD-Audio or SACD player that are connected to the 6/8-Channel Direct Inputs g. Select the appropriate input according to the way your system and source equipment are configured: 6 CH DIRECT should be used when the SBR and SBL inputs are NOT in use.The AVR 235 operates

31、on the assumption that the input source device has its own internal bass- management system.This input passes the input from the source directly through to the volume control without any analog to digital conversion and it mutes the unused input jacks to prevent unwanted noise from interfering with

32、system performance. 8 CH DIRECT should be used when an input is connected to all eight 8-Channel Direct Inputs g.The AVR 235 operates on the assumption that the input source device has its own internal bass-management system.This input passes the input from the source directly through to the volume

33、control without any analog- to-digital conversion, and it mutes the unused input jacks to prevent unwanted noise from inter- fering with system performance. Volume Control Adjust the volume to a comfortable level using the front-panel Volume Control or remote Volume Up/Down Buttons . When listening

34、in one of the Stereo modes with the surround circuits off, the Balance Control may be used to adjust the relative sound output between the front left and right speakers. For all other modes, it is important that the Balance Control remain in the “12 oclock” position in order to ensure a proper sound

35、 field presentation. To temporarily silence all speaker outputs, press the Mute Button.This will interrupt the output to all speakers and the headphone jack, but it will not affect any recording or dubbing that may be in progress.When the system is muted, the word MUTE will flash in the Lower Displa

36、y Line . Press the Mute Buttonagain to return to normal operation. You may adjust the bass and treble tone controls at any point during a listening session by simply turn- ing the Bass Control or Treble Control until the desired setting is achieved.You may also totally remove the tone controls from

37、the circuit so that the output is “flat” at any time by pressing the Tone Mode Button 5 and then pressing the / Button ) so that TONE OFF appears in the on-screen display and the Lower Display Line . 42 42 38 3432 90 min 80 min 70 min 60 min 50 min 40 min 30 min 20 min 10 min OFF AVR 235 OM 8/27/04

38、4:16 PM Page 25 AVR235 harman/kardonAVR235 harman/kardon www.freeservicemanuals.infoIts Free www.freeservicemanuals.info RadioFans.CN 收音机爱 好者资料库 OPERATION 26OPERATION For private listening, plug the 1/4 stereo phone plug from a pair of stereo headphones into the front-panel Headphone Jack 4.When the

39、 headphone plug is connected, all speakers will be silenced and DOLBY H:BP will scroll once across the Lower Display Line , indicating that the headphone output is in the Bypass mode, and to confirm that no processing is being used.When the headphone plug is removed, the audio feed to the speakers w

40、ill be restored. When the headphones are in use, you may take advantage of the Dolby Headphone modes to bring added spaciousness to headphone listening. Press the Dolby Mode Select Button w or the Surround Mode Group Selector 7 to cycle through the three Dolby Headphone modes and select the one that

41、 you prefer. Surround Mode Selection One of the most important features of the AVR 235 is its ability to reproduce a full multichannel surround sound field from digital sources, analog matrix surround-encoded programs and standard stereo programs. Selection of a surround mode is based on personal ta

42、ste, as well as the type of program source material being used. For example, motion pictures or TV programs bearing the logo of one of the major sur- round-encoding processes, such as Dolby Surround or DTS Stereo, may be played in either the Dolby Digital, Dolby Pro Logic II Cinema, Dolby Pro Logic

43、IIx Cinema, DTS Neo:6 Cinema or Logic 7 Cinema surround modes, depending on the source material. NOTE: Once a program has been encoded with matrix surround information, it retains the surround information as long as the program is broadcast in stereo.Thus, movies with surround sound may be decoded v

44、ia any of the analog surround modes such as Dolby Pro Logic II Movie, Logic 7 Cinema or DTS Neo:6 Cinema, when they are broadcast via conventional TV stations, cable, pay-TV and satellite transmission. In addition, a growing number of made-for-television programs, sports broad- casts, radio dramas a

45、nd music CDs are also recorded in surround sound. Even when a program is not listed as carrying inten- tional surround information, you may find that the Dolby Pro Logic II, Logic 7 Enhanced or DTS Neo:6,VMAx and the Hall or Theater modes often deliver enveloping surround presentations through the u

46、se of the natural information present in all stereo recordings. Surround modes may be changed at any time by using either the front panel or remote control.To select a new surround mode from the front panel, first press the Surround Mode Group Selector Button 7 until the desired major surround mode

47、group such as Dolby, DTS or Logic 7 is selected. Next, press the Surround Mode Selector Button 8 to choose the specific individual surround mode. To select a surround mode using the remote, press the button for the major surround mode group that includes the mode you wish to choose from: Dolby w, DT

48、S Surround x, DTS Neo:6 , Logic 7 y, Stereo or DSP Surround k.The first press of the button will show the current mode from that group if it is already in use, or the first available mode if you are currently using another mode.To cycle through the available modes in that group, press the button aga

49、in until the desired mode appears in the Lower Display Line , in the on-screen display and in the Surround Mode Indicators . As the surround modes change, the appropriate Surround Mode Indicatorwill light to indicate which mode has been selected. The Dolby Digital, Dolby Digital EX and DTS 5.1, DTS-ES Matrix and DTS-ES Discrete modes may only be selected when a digital input is in use. In addition, when a digital sou