Marantz-2252-int-om维修电路原理图.pdf

RadioFans.CN 收音机爱 好者资料库 -iin Model2252 Stereop hon ic Receiver MARANTZCO., INC. 20525 NORDHOFF STREET, CHATSWORTH,CALIFORNIA91311 A WHOLLY-OWNEDSUBSIDIARYOF SUPERSCOPE INC., CHATSWORTH,CALIFORNIA91311 RadioFans.CN 收音机爱 好者资料库 FOREWORD For optimumperformance and enjoymentfrom yourModel 2252 Stereo Receiver, please study theseinstructionscarefully.Installationand operationare not complicated, but its flexibility and features deserve your becoming familiar with its controls and connections. This manual is dividedinto two parts. The first covers installationand operationin simple, non- technical language.The second describesthe 2252 in more detail withtechnical specificationsand functionalexplanations. For quick identificationof the controls and con- nections, referencesto them are printed in BOLD- FACETYPE, exactly asthey appear on the front and rear panels of your Receiver. AC Line Operation WARNING:TO PREVENTFIRE OR SHOCKHAZARO,00 NOTEXPOSETHISAPPLIANCETO RAINOR MOISTURE. GENERALDESCRIPTION TheMarantzModel2252is an all solid state receiver incorporatingthe innovative design and unparalleled technologythat have made Marantz famous in the audio component industry. The Model 2252 features a sensitive stereo FM tuner, a highly selective AM tuner, and a low dis- tortionpreamplifierand amplifierona single chassis.The FM tuner features a front end which employs a dual gate MOSFET and FM IF unit, a phase locked loop multiplexdecoder and an AM tuner,all of which utilizeICs throughout.The amplifiersections permit the connectionof two stereopairsofloud-speakers,a turntableor record changer, two tape recorders, stereo head- phones, and an auxiliary source such as an addi- tional tuner or a TV sound source. AFTERUNPACKING It is advisable to retain all original packing mate- rial to prevent damage should you wish to trans- port or ship the Model 2252 (refer to page 14 for repacking and shipping instructions).Be careful that you do not inadvertently throwawayor lose the parts packed with the unit. Pleaseinspect your Model 2252 carefully for any signs of shipping damage. Our very strict quality controland professional pride ensure that each Model 2252 left the factoryin perfect condition. If the unit is damaged or fails to operate, imme- diately notify your dealer. If the unit wasshipped to you directly,notifythe transportationcom- panywithoutdelay.Onlyyou, the consignee, may institute a claim against the carrier for ship- ping damage. Save thecartonand all packing material as evidence of damage for their inspec- tion.Should assistance be required, the Marantz Company willcooperate fullyin assisting your claim. Pleasefill out and mail the Warranty Registration Card withinten days of purchase. The card will remain on file at the Marantz Company for the durationof the warranty period. We also strongly advise that you retain your sales receipt to pro- vide proof of purchase in the event that warranty service issought. RadioFans.CN 收音机爱 好者资料库 TABLEOFCONTENTS PreparationforUse 1 Tape Recordingand Dubbing 7 Rear Panel Connections 1 Recording 7 PhonoInputs 1 Dubbing 7 Tape Jacks 1 RecordingDolbyizedFM Programs 7 Tape 1-ln 1 Tape 2 In 1 TechnicalDescription 8 Tape 1 such systems are usually designed expressly for television reception and frequently suppress FM signals before distribution.In addi- tion,master antenna systems often severely re- duce the qualityof the FM signal. Where outdoor antennas are prohibited or inconvenient, place the antenna in vacant attic space or use a simple 300 ohm TV rabbitear antenna or the ribbon-type foldeddipoleantenna supplied withthe Model 2252. Both are practical and will give satisfactory results in primary signal areas. Figure 2 shows connectionmethods for various antennas. If 75-ohm cable is desired, we recom- mend using the type with an F-typeconnector terminal attached to the cable. This is the easiest type of cable to connect and disconnect. AM ANTENNA Your Tuner is equipped withan AM ferrite-rod antenna. BEFOREUSING THE MODEL 2252, SWING THEANTENNAOUTAS SHOWN IN FIGURE 3. The ferrite-rodantenna will give you satisfactory results in primary signal areas. However, an out- doorantenna willprovidebetterreceptionin weaker signal areas.Three single wires are required to make an AM outdoorantenna. First, connect one end of a single wire to the AM ANTENNA terminal on the rear panel, and the other end to a very high horizontal antenna wire of 25 to 75 feet in length suspended between insulators in an out- door location(the higher the better). Next, con- nectthethirdsingle wirebetweentheG terminalof yourModel 2252 and an authenti- cated earth ground (such as a metal water pipe). 2 RadioFans.CN 收音机爱 好者资料库 LEFT nlTTI 1- III I 1fll!rl 1J111J1 r1l1Tj -:.-:-. SPEAKERSYSTEM1 + -c- SPEAKERSYSTEMS .SYSTEM1 RLltjldJ ldJ ldJ SYSTEM2 l6JlaJBJffi - + SPEAKERSYSTEM2 RIGHT rTTJn IIUrI r -I!I1I:r ILLllrili LITITIH -._-:-_. FM QUADRADIALOUTPUT JACK Figure 4.Loudspeaker System Connections Iy breaks the internal connections to prevent the external equipment from being bypassed. In anticipationof future four channel quadrapho- nic broadcasting,yourModel 2252 is equipped withan FM QUADRADIALOUTPUT jack. The signal available at this jackis the unequalized bufferedoutputoftheFM discriminator.Its level, frequency response characteristics, and out- put impedance are ideal to drive a four channel adaptor.This jack can also be used as a simple whitenoise generator for checking the response characteristics of loudspeakers of amplifiers.For this application,connect the FM QUADRADIAL OUTPUT jack to the TAPE 1 input jack, pressthe TAPE 1 MONITOR switch, place the Model 2252 inFMmodewiththemutingoffand tune between FM stations to receive interstation noise. PRE OUT ANDMAININ JACKS The PRE OUT jacks deliver the outputof the Model2252preamplifiercircuitstotherear panel. The MAININ jacks are the input terminals of the power amplifier section of the Model 2252. The PRE OUT and MAININ jacks are bridged internallybyspecial contactswithinthe jack assembly. When you wish to use such equipment as a graphicequalizer,compressor/limiter,or expander, you may connect these instruments to yourModel2252withappropriatelengths of shielded audio cables. When the external equip- mentis connected,theinsertionofitsRCA phono plugs in to the MAIN IN jacks automatical- 3 SPEAKE R SYSTEMS The SPEAKER SYSTEMS terminals on the rear panel can accommodate two stereo pairs of loud- speakers. Connect the main pair to the SYSTEM 1 terminals.The SYSTEM 2 terminals are for a second stereo pair of loudspeakers (seeFigure 4). Selection of loudspeaker systems is made with the SYSTEM 1-SPKR-SYSTEM2pushswitcheson the front panel. To connect the speakers to the 2252, useordina- ry #18 gaugetwo conductorlamp cord. For dis- tances longer than 30 feet, use#16 gaugewire or heavier. SPEAKER PHASING To assurethe best stereo separation and frequen- cyresponse, thespeakersmustbeproperly phased. Thepositive terminalon each speaker should be connected to its respective(+)terminal ontheModel2252,andthenegativeor commonterminalshould be connected to its respective (-)terminal.To verifythat a pair of speakersare correctly phased, perform the follow- ing test: 1. Complete the necessary signal connections so that program material may be played through the speakers. RadioFans.CN 收音机爱 好者资料库 2. Place thespeakersin thecenterof the room. 3. Depress theMONOpushswitchand playare- cord(orradioor tape)withstrongbass tones at a lowvolumelevel.CentertheBALANCE control. 4. Positionthespeakersaboutsixinchesapart, face-to-face.Listen,particularlytotheappar- ent loudness of the bass tones. 5. Next, turnoff all power,but do not disturbthe VOLUMEor BALANCEsettings.Reverse the connectionson the right speaker only.Turnon thepowerand listenagain.If thebass tones now seem louderthan in (3), you have correct- ed thephasingbetweenthespeakers.Ifthe bassnotesnowsoundsofter,turnoffthe powerand reconnectthe speakers as theyhad been originally. 6. If an additionalpairof speakers is used along withthemainspeakersystem,checkphasing betweentheremotespeakersandthemain speakers.Use theBALANCEcontroltoplay onlytwospeakersatonce,andinvertthe wiringontheremotespeakersas necessary. Donotchangetheconnectionson themain speaker system. 7. Once havingphased all speakers,youneed not repeat thisprocedurein the futureif you now markthespeakerconnectionsand/orcables. Anymethodof codingis satisfactory,provided it enables you,in the future,to duplicateyour now-correcthookupbtweenspeakers and am- plifier. Use cautionwhen connectingyourModel 2252 to a loudspeakerwithbuilt-inpowersupplysuch as anelectrostaticloudspeaker.Thecommon connectionterminalofsucha speakermay be capacitivelycoupledtogroundthroughits own powersupply.ToprotecttheModel2252from distortionandpossibleoverload,makesure the (-)terminalsof the Model 2252are connectedto thecommonterminalsofsuch a loudspeaker system. CAUTION:NEVERDIRECTLYCONNECTTHE LOUDSPEAKERTERMINALSOF ONECHANNELINPARALLEL WITHTHOSEOFANYOTHER. ANYRESULTINGDAMAGEIS NOT COVEREDUNDERWARRANTY. NOTE:Do notuse 4 ohm speakers if mainand remotespeakersare tobeuSed simu1- taneously.Use 8or16 ohmspeakers only. CONNECTIONTOAC OUTLET Withthe frontpanel POWER pushswitchOUT, plug the line cord into an electricaloutletsupply- ing the propervoltage. CAUTION:DONOTPLUGYOURMODEL 2252INTOADCOUTLET,AS SERIOUSDAMAGEWI LL OCCUR. CONVENIENCEOUTLETS OneUNSWITCHEDandoneSWITCHEDAC OUTLETare providedon the rear panel for pow- ering associated componentsof your system(tape recorder,record player,etc.). ACPROTECTORFUSE ThisfeatureautomaticallydisconnectsAC power in the event of a power source or circuitoverload. IfthePOWERpushswitchis activatedand the frontpanelfailstoilluminateand no soundis heardthroughthespeakers,turnoffthepower and unscrewthe fuse holderon the rear panel and visuallyinspectthe fuse to see if the internalcon- ductingfilamenthas opened.If so, replacethe fuse withone having the same specifications.See FuseReplacement,page 11. 4 RadioFans.CN 收音机爱 好者资料库 e po,re .olurne FM,.-SPKR-. LOUDNESSMUTIP3SYSTEM 1 SVSTEM:2 trebleInid ,_Lalanc:e-R -.-_. bassselector TAPE;t FM 26SMONITOR .- Figure 5.Front Panel Controls and Jack SIMPLIFIEDOPERATING PROCEDURES MAINCONTROLS ANDSWITCHES When operating the Model 2252 Stereo Receiver for the first time, followthese simple directions. Later, full advantagecan be taken of its versatility with the remaining controls and pushswitches. Step 1.Connect the FM antenna to the appro- priate terminals on the rear panel. POWER SWITCH The POWER switch, when depressed,supplies AC power to the Model 2252 and to the SWITCHED outlet on its rear panel. SELECTORSWITCH Step 2.Connect the speakers to the SYSTEM 1 speaker terminals. Step 3.Place all pushswitches in the outposi- tion. Step 4.Turn the VOLUMEcontrolall the way totheleft(counterclockwise)and set the balance control in center position. TheSELECTORswitchselectstheprogram source forlistening or recording.If a tape re- corders playback outputhas been connected to the TAPE 2 IN jacks on the rear panel, you can select tape listening by rotating the SELECTOR SWITCH to the TAPE 2 position. VOLUMECONTROL Step 5.Rotate TREBLE,MIDand BASS con- trolsto the12 oclockposition(each pair of pointers to dot). The VOLUMEcontroladjusts the level of both outputchannels simultaneouslywhile maintain- ing stereo balance at all normal settings. It does not effect the record ing outputs. Step 6.Depress the SYSTEM 1 speaker push- switch. BALANCECONTROL Step 7.Applysystem power by depressing the POWER switch. Step 8. 5 Select the desired program source by set- ting the SELECTORswitch to the ap- propriate position. If FM or AM isselect- ed,rotatetheGyro-TouchTUNING knob untilthe desired station is tuned. Adjust the volume control to a comfort- able listening level. This control alters the level of either output chan- nel in situationswhere it is necessaryto correct unbalanced programs sometimes encountered in older stereo recordings or in stereo broadcasts. As it is moved from its center position, it decreases the level in one output channel while maintaining the level in the other channel. RadioFans.CN 收音机爱 好者资料库 BASS, MID AND TREBELCONTROLS These controlsare used to adjust the tonal bal- ance of program material to suit individual listen- ing preference. TUNINGMETER The Model 2252 is equipped with two meters, a SIGNALSTRENGTHMeteranda TUNING Meter. 1. The SIGNAL STRENGTHMeter indicates the signal strengthof any AMor FM broadcast. 2. The TUNINGMeter operates on FM only and indicates correct center tuning of the station. GYRO-TOUCHTUNINGCONTROL AM Switch the SELECTOR to AM and tune to the desired station.Then rotate the GYRO-TOUCH TUNINGknob slightlyback and forthuntil the maximumreading is obtainedon the SIGNAL STRENGTHMeter. The TUNINGMeter is not usedfor AM. FM Switchthe SELECTORto FM and tune to the desired station.Then slowlyrotate the GYRO- TOUCHTUNINGknobback and forthuntil maximumreading is obtainedon the SIGNAL STRENGTHMeterandtheTUNINGMeter points to the center scale position. The multiplex section of the Model 2252 is equipped with elec- tronicallytriggeredcircuitswhichmuteinter- stationnoise and automaticallyswitchtothe proper mode of operationfor stereo and mono- phonic FM broadcasts. In addition,the STEREO indicatorlightautomaticallyindicates a stereo broadcast. LEFTCHANNEL COMMON RIGHTCHANNEL Figure6.StereophonePlug FM-25/lS SWITCH To listen to a Dolbyized FM broadcast, connect a Dolby noise reduction adaptor between the TAPE lOUTand IN jacks on the rear panel of the Model 2252.Depress theFM-25/lS pushswitch, and depress the TAPE 1 MONITORswitch. With the FM-25/lS switch in, the audio outputsignals anpreset internally to standard Dolby level, and thede-emphasis timeconstantappliedtothe signals is also switched to 25/lsec automatically. SYSTEM l-SPKR-SYSTEM2 SWITCHES These switches select the loudspeaker terminals to which audio power is fed. Either the SYSTEM 1 or the SYSTEM 2 stereo pair of loudspeakers may be operated individually,or simultaneously ifbothswitches are depressed. When the two SYSTEM l-SPKR-SYSTEM2 switches are in the normal outposition, all loudspeaker terminals are internally disconnected from the power ampli- fier section. The signal at the headphones jack is not affected by the SYSTEM l-SPKR-SYSTEM2 switches.Theoutpositionallowsprivate listening when stereo headphones are used. NOTE:Volumelevelshouldbereducedto minimum when switching speakers. PHONES JACK This jack accepts headphones utilizinga standard three conductorphone plug (see Figure 6). It is internallyconnected to the power amplifier sec- tionthroughisolationresistors to provideade- quate sound level withpopularlow impedance headphones as well aswith high impedance units. Twoor more sets of headphones may be used with the aid of Yconnectors. However, output levelwilldropas additionalheadphones are added. The headphone jack outputis not affected by the