Marantz-MR2020-cs-sm 维修电路原理图.pdf

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1、system MR2020 / Layla4822 725 51183First Issue 1999.01298J855010 MITPrinted in JapanServiceManualRPlease use this service manual with referring to the user guide ( D.F.U. ) without fail.74 MR2020 /2G (Layla)MR2020 F,K,KK,U CD/Tuner SystemTABLE OF CONTENTSSECTIONPAGEMR2021 (CD/Tuner Amplifier) 1 TECH

2、NICAL SPECIFICATIONS . 1-1 2-1 HOW TO DISASSEMBLE . 2-1 2-2 REPAIR INTRODUCTION . 2-6 2-3 EXPLANATION OF CIRCUITS . 2-6 3 SERVICE MODE . 3-1 4-1 BLOCK DIAGRAM . 4-1 4-2 AM STEREO ADJ.(F ONLY) . 4-1 4-3 MICROPROCESSOR DATA . 4-1 5 WIRING DIAGRAM . 5-1 6 SCHEMATIC DIAGRAM AND PARTS LOCATION. 6-1 7B TU

3、NER BOARD ECO5 .7B-1 7D TUNER 95 BOARD . 7D-1 8 CD NAMI 8 BOARD. 8-1 9 EXPLODED VIEW AND PARTS LIST. 9-1 10 ELECTRICAL PARTS LIST . 10-1LS2021 ( Speaker System ) 1 EXPLODED VIEW AND PARTS LIST. 1-1CAUTION The System MR2020 (Layla) combines MR2021 (CD/Tuner Amplifier) with LS2021 (Speaker System).Rad

4、ioFans.CN 收音机爱 好者资料库MARANTZ DESIGN AND SERVICEUsing superior design and selected high grade components, MARANTZ company has created the ultimate in stereo sound.Only original MARANTZ parts can insure that your MARANTZ product will continue to perform to the specifications for whichit is famous.Parts

5、 for your MARANTZ equipment are generally available to our National Marantz Subsidiary or Agent.ORDERING PARTS :Parts can be ordered either by mail or by Fax. In both cases, the correct part number has to be specified.The following information must be supplied to eliminate delays in processing your

6、order :1. Complete address2. Complete part numbers and quantities required3. Description of parts4. Model number for which part is required5. Way of shipment6. Signature : any order form or Fax. must be signed, otherwise such part order will be considered as null and void.MARANTZ AMERICA, INC.440 ME

7、DINAH ROADROSELLE, ILLINOIS 60172USAPHONE : 630 - 307 - 3100FAX: 630 - 307 - 2687LENBROOK INDUSTRIES LIMITED633 GRANITE COURT,PICKERING, ONTARIO L1W 3K1CANADAPHONE : 905 - 831 - 6333FAX: 905 - 831 - 6936MARANTZ EUROPE B. V.P.O.BOX 80002BUILDING SFF25600 JB EINDHOVENTHE NETHERLANDSPHONE : +31 - 40 -

8、2732241FAX: +31 - 40 - 2735578SUPERSCOPE TECHNOLOGIES, INC.MARANTZ PROFESSIONAL PRODUCTS2640 WHITE OAK CIRCLE, SUITE AAURORA, ILLINOIS 60504 USAPHONE : 630 - 820 - 4800FAX: 630 - 820 - 8103TC ELECTRONICS CANADA LTD.540 FIRING AVE.BAIE DURF, QUEBEC H9X 3T2CANADAPHONE : 514 - 457 - 4044FAX: 514 - 457

9、- 5524MK ENTERPRISES LTD.2F SHINHAN BLDG., 247-17 SEOKYO-DONGMAPO-KU, SEOULKOREAPHONE : +82 - 2 - 323 - 2155FAX: +31 - 2 - 323 - 2154MARANTZ BRAZILCAIXA POSTAL 21462CEP 04698-970SAO PAULO, SP , BRAZILPHONE : 0800 - 123123FAX: +55 11 534. 8988PAl- YUING CO., LTD.6 TH FL NO, 148 SUNG KIANG ROAD,TAIPEI

10、, 10429, TAIWAN R.O.C.PHONE : +886 (2) 5221304FAX: +886 (2) 5630415MRZ STANDARD CO., LTD.746 - 754 MAHACHAI RD.,WANGBURAPAPIROM, PHRANAKORN,BANGKOK, 10200 THAILANDPHONE : +66 - 2 - 222 - 9181FAX: +66 - 2 - 224 - 6795WO KEE HONG ELECTRONICS SDN. BHD.NO. 102 JALAN SS 21/35, DAMANSARAUTAMA, 47400 PETAL

11、ING JAYASELANGOR DARUL EHSAN,MALAYSIAPHONE : +60 3 - 7184666FAX: +60 3 - 7173828MARANTZ JAPAN, INC.35- I , 7- CHOME, SAGAMIONOSAGAMIHARA - SHI, KANAGAWAJAPAN 228-8505PHONE : +81 42 748 1013FAX: +81 42 741 9190FORWARD MARKETING (S) PTE. LTD.23, LORONG 8, TOA PAYOH,SINGAPORE 319257.PHONE : +65 2583640

12、FAX: +65 3564047SHOCK, FIRE HAZARD SERVICE TEST :CAUTION : After servicing this appliance and prior to returning to customer, measure the resistance between either primary ACcord connector pins ( with unit NOT connected to AC mains and its Power switch ON ), and the face or Front Panel of product an

13、dcontrols and chassis bottom.Any resistance measurement less than 1 Megohms should cause unit to be repaired or corrected before AC power is applied, andverified before it is return to the user/customer.Ref. UL Standard N0. 1492(DR700) and No. 813(CDR630).USACANADAEUROPE / TRADINGUSACANADABRAZIL(Dis

14、cagem Direta Gratuita)TAIWANTHAILANDMALAYSIAIn case of difficulties, do not hesitate to contact the TechnicalDepartment at above mentioned address.JAPAN TechnicalSINGAPORE98110MITSCAN AUDIO PTY. LTD.52 CROWN STREET, RICHMOND 3121VICTORIAAUSTRALIAPHONE : +61 - 3 - 9429 - 2199FAX: +61 - 3 - 9429 - 930

15、9AUSTRALIA / NEW ZEALANDKOREARadioFans.CN 收音机爱 好者资料库1. TECHNICAL SPECIFICATIONSFM TunerFrequency range. 87.5 108.0 MHz F only . 76.0 90.0 MHzSensitivity . 21.2 dBf / 3.2 VS/N (Mono/Stereo). 75 / 43 dB F only . 70 / 50 dBTHD (Mono/Stereo) .1.5 / 1.5 %MW TunerFrequency range. 531 1602 kHz U only . 530

16、 1700 kHzSensitivity . 500 V / m /02, F only . 400 V / mS/N. 50 dBLW TunerFrequency range. 153 279 kHzSensitivity . 1800 V / mAmplifierMusic power. 25 W + 25 W (4)Input sensitivity (AUX) .310 mV / 47 k U only .250 mV / 47 kS/N (AUX) . 85 dBCD PlayerChannels . 2 channelsFrequency response .20 20,000

17、Hz 3 dBS/N.82 dB (1000 Hz)THD .0.04 % (1000 Hz)Output level.2 V RMSGeneralPower supply /02 version. AC 230 V, 50 Hz F version .AC 100 V, 50Hz / 60 Hz K version . AC 110V / 220 V, 50Hz / 60 Hz KK version. AC 220 V, 60 Hz U version . AC 120 V, 60 HzPower consumption .25 WPower failure backup time .APP

18、ROX. 15 min.Dimensions . 450(W) x 104(H) x 308(D) mmWeight. 5.8 kgTable top Speaker LS2021Speaker Mid-bass .4” Dome tweeter.3/4”Input power Rated . 25 W (6) Max. . 40 W (6)Frequency response .80 20,000 Hz 6 dBDimensions . 190(W) x 200(H) x 100(D) mmWeight. 1.5 kgDesign and specifications are subject

19、 to change without notice.1-12-1. HOW TO DISASSEMBLE MR20201. Take the bottom case (001G) apart(1) Turn MR2020 upside down by the jig (Refer to fig.1-3).Take care that the top cover will not damaged, especiallythe 4 levers. If you dont have the jig, you prepare to putsome magazine or telephone guide

20、 under the MR2020(The height is over 3cm books). Fig.1 A jig for MR2020(2) Remove 15 screws as shown in fig.4.Fig.2 The jig on MR2020Fig.3 Turning over the MR20202-1Fig.4 Position of 15 screws(3) While lifting the bottom case, remove the rear panel asshown in fig.5-6.Fig.5 Lifting the bottom case(4)

21、 Remove the mains code bush as shown in fig.7.Fig.6 Removing the rear panel2-2Fig.7 Removing the mains code bush(5) Lift up the bottom case, remove the put the one with turningto front side (Refer to fig.8).Remark for reassembleWhen you fit the bottom case, remove the lid of the bottomcase (Refer to

22、 fig.9) and confirm the arrangement of leadlines for transformer.(Refer to fig.10). Fig.9 Removing the lid of the bottom caseFig.10 Arrangement of lead lines2-3Fig.8 Taking the bottom case apart2. Take the top panel (001D) apart(1) Turn MR2020 upside down by the jig. (Refer to fig.1-3)Take care that

23、 the top cover will not damaged, especiallythe 4 levers. If you dont have the jig, you prepare to putsome magazine or telephone guide under the MR2020.(The height is over 3cm books)(2) Push the rear panel while keeping hold the top cover (seefig.11 below). The top cover will move 5mm. (fig.12-13)Now

24、, 4 screws on the top cover will become accessible.(fig.14) Take out these screws. (M3 type screw) Fig.11 Pushing the rear panelFig.13 Pushed the rear panelFig.12 Before pushing the rear panelFig.14 Positions of 4 screws2-4(3) Turn the MR2020 to its normal operating position.(4) Open the top cover o

25、f MR2020 by hand.(5) Take out the 2 screws (M2 type screw) on the top (seefig.15).(6) The upper part and lower part of the top cover areconnected to each other with adhesive tape. Separatethese parts by pushing the transparent upper part in themiddle (on CD shaped part) from the lower part, whilehol

26、ding the lower part.(7) The upper part and lower part of the top cover wereseparated (See fig.16-17).Fig.16 The upper part of top cover (the reverse side)Fig.17 The lower part of top cover and the others2-5Fig.15 Positions of 2 screws on the top2-2. REPAIR INTRODUCTIONPREPARATION FOR CD BLOCK1.Set a

27、 disc for repair into product.2.Turn the product upside down on the jig (PartsNo.*MR2021JIG). Take care that the top cover will notdamaged, especially the 4 levers. (Refer to How todisassemble MD2020)3.For the top panel will not open while repairing, removethe connecting wires of panel motor from th

28、e connector(J812).4.Repair and operate it on the upside down position ofthe product.PREPARATION FOR MAIN AMPLIFIER PCB (P704)1.Main amplifier is BTL output.2.For removing the main amplifier PCB (P704) from theproduct, remove the wire (W802) from the terminal(WU02) of microprocessor PCB (PU04). Conne

29、ctanother wire with terminal (WU02) and GND as chassisinstead of the wire (W802).REMARKRemove the bottom case from the product, Do not outputsignals of over 1W from both channels more than 10minutes continuously.2-3. EXPLANATION OF CIRCUITSFAN OPERATIONThe voltage added to the diode (D852) is depend

30、ed onthe resistance of the thermistor (R857) and resistors(R855,R858). When the temperature of the heat sinkgoes up, the resistance of the thermisor (R857)decreases, and the voltage added to the diode (D852)increases.1.When the temperature of the heat sink is over 70degrees Celsius, then D852 is on,

31、 through R852, Q851is on, and the fan starts to revolve.2.When the temperature of the heat sink is approx. 100degrees Celsius or more, through R853, Q853 is on,and the product is STAND-BY status. But, if the fanrevolve normally, the temperature of the heat sink willnot be over 100 degrees Celsius an

32、d not be STAND-BY status. Therefore, the procedure of the over heatprotection circuit check is as follows;(1) Connect the test point (J814) with a resistor of 680ohm.(2) If the product is STAND-BY status, this circuit is normal.(3) Remove the resistor of 680 ohm from the test point(J814).FAN OPERATI

33、ON CHECKKeep outputting 2.5W from both channels of the product.2-6When the bottom case is closing. If the fan revolving startswithin 10 minutes, the function is correct working.Otherwise keep outputting 1W from both channels of theproduct when the bottom case is opening. If the fan revolvingstarts w

34、ithin 5 minutes, the function is correct working.REMARKDo not output over 1W when the bottom case is open.VCC CONTROLThe regulation of primary voltage is not so higherintentionally for decreasing the no-load loss. Therefore, thiscircuit is used for the product to keep the voltage toleranceof the pow

35、er IC. This circuit do not work when the output isfrom 0 to approx. 1Vrms. Then VCC is supplied from D709only. When the output is more than 1Vrms, through D701-D704, R722, D706, and Q703 is on, current is suppliedfrom Q702. When the output is over approx. 3Vrms, D709is off, and VCC is supplied from

36、Q702 only.SPEAKER PROTECTION1.When either terminal of BTL outputs connect with GND(chassis) by mistake, the speaker protection circuit willwork as follows. through R707-R710, Q704 or Q705 ison, and Q706 is on. Then #5Pin for Q701 is 0V, power IC(Q701) will be in power off. Therefore, the product wil

37、l beSTAND-BY status.2.When the VCC CONTROL circuit is working correctly,maximum current of R825 is 1A, and voltage betweenR825 load is maximum 0.33V. When both terminals of BTLoutputs are shorted on outputting over 0.25W, R825 issupplied over 2A, Q807 and Q803 is on, and the productwill be STAND-BY

38、status.CD 5V ON/OFF CONTROLThe voltage for CD (CD 5V) is supplied from QX04 whenthe following conditions are satisfied fully. (for noise andlaser protection)1.Setting a disc on the product, and QU08 is on.2.Closing top panel, and #78Pin for QU10 is 0V.3.The product is in CD mode.MUTE CONTROLMute sig

39、nals output from microprocessor (QU10) areMUTE (Pin No.37), MUTE2 (Pin No.7), and DSC MUTE(Pin No.5).Fig.1 is workable output terminals by each mute signals,Fig.2 is the status of each mute.2-7Fig.1Q701(SPK)QN01-QN04(PHONE)QX05,QX06(SUB WOOFER)QX07,QX08(LINE OUT)QE01MUTEYESYESYESNONOMUTE2NONODSC MUT

40、ENONONONOYESNOYESNOTOP PANEL OPEN SENSOR1.The pulse (T=84msec, Duty 50%) is always added to LED(QU15), from #30Pin of QU10, through RF28 and QU22.2.Cover the sensor with your fingers, the collector voltageof QU01 goes up over 0.7VP-P . and through RU71 andQU09, the pulse of 5VP-P inputs to #29Pin of

41、 QU10. Thenthe top panel will open.3.Not needing to cover the sensor with your fingers, QU01receives the light of LED reflected by lens oneself.Therefore, the collector of QU01 adds the reverse pulsethrough RF29, QU26 and RF32, for reduced incorrectworking. So, the voltage of residual pulse for the

42、collectorof QU01 is suppressed to 0.1VP-P .REMARKWhen the sensor receives sunlight or a strong light asincandescent, top panel might open.POPS NOISE KILLERRX72, CX70 and QX70 are the circuit to delay power supplyfor approx. 2 seconds. Therefore, this circuit prevents popsnoise generation when power

43、switch is on or off.SUB WOOFERSub woofer output is composed a low pass filter of cut-offfrequency 150Hz octave 12dB. It is output 2V for AUX L,Rinput 60Hz, 200mV (volume is maximum).REMARKSub woofer output level is depended on volume control.2-8Fig.2POWERON/OFFCD MODE STOP ORTRACK JUMPMUTE BUTTONONM

44、ODECHANGEVOLUMEMINIMUMMUTEYESYESYESYESYESMUTE2YESYESNOYESNODSC MUTENOYESNONONO3 SERVICE MODE1. How to set the service mode(1) While holding the CLOCK and CLEAR buttons together,put the mains plug to mains outlet.(2) FL check mode will start.(3) While in FL check mode, each time the FUNCTION buttonpr

45、essed (within 2 seconds), the mode changes in thefollowing order.TR FREQ (Tracking point frequency memory mode) CD TEST (CD test mode) FL CHK (FL check mode) TR FREQ (Tracking point frequency memory mode)2. FL CHECK MODEFL check mode will continue until change other mode.3. TRACKING POINT FREQUENCY

46、MEMORY MODEThis mode is not available for repair(This is for check infactory.). If you set in this mode, some frequencies willregister in each preset memory.REMARKUser programmed frequencies will be deleted.While in Tracking point frequency memory mode, press theMEMO button. Press the CLEAR and the

47、DISPLAY buttonstogether. The display shows “CLEAR” 2 seconds. Then allmemories will be clear.4. CD TEST MODE(1) Press the “+” button, then the sledge move to the outside.Press the “-” button then the sledge move to the inside.Press the CLEAR button while the sledge is moving, thenthe sledge stop.(2)

48、 Press the MEMO button, then the laser pick up unit isgiving out the beam. Press the MEMO button again thenthe laser pick up unit stop beam out. All operations areavailable without the Disc.(3) While in CD test mode, CD play is available in openingthe top panel.(4) If any ERROR is happened, the disp

49、lay shows “CD ERRX”.(X is a ERROR code.) The ERROR message will not beclear until pressing STOP or POWER buttons.Error CodeDescription1The sledge switch not turn on.2The sledge switch not turn off.3The laser pick up unit not focus.4The tracking is not fixed.5The spindle motor not locked.5. How to st

50、op the service modePress the POWER button. Then product will be in POWEROFF (STAND-BY).REMARKThe microprocessor will not be clear by this operation.(Refer to 3. TRACKING POINT FREQUENCY MEMORYMODE)3-14-14-14-1 BLOCK DIAGRAMDECODER/U-COMSAA7372SERVODRIVERTDA7073ATHF AMPTDA1300TCD UNIT CD94V5B1SLEDMOT