Marantz-MR-2020-Service-Manual(1) 电路图 维修手册.pdf

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1、system MR2020 / Layla 4822 725 51183 First Issue 1999.01 298J855010 MIT Printed in Japan Service Manual R Please 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 System TABLE OF CONTENTS SECTIONPAGE MR2021 (CD/Tuner Ampl

2、ifier) 1 TECHNICAL 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 LOCATI

3、ON. 6-1 7B TUNER 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 . 10-1 LS2021 ( Speaker System ) 1 EXPLODED VIEW AND PARTS LIST. 1-1 CAUTION The System MR2020 (Layla) combines MR2021 (CD/Tuner Amplifier) with LS2021 (Spea

4、ker System). RadioFans.CN 收音机爱 好者资料库 MARANTZ DESIGN AND SERVICE Using 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 whic

5、h it is famous. Parts 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 de

6、lays in processing your order : 1. Complete address 2. Complete part numbers and quantities required 3. Description of parts 4. Model number for which part is required 5. Way of shipment 6. Signature : any order form or Fax. must be signed, otherwise such part order will be considered as null and vo

7、id. MARANTZ AMERICA, INC. 440 MEDINAH ROAD ROSELLE, ILLINOIS 60172 USA PHONE : 630 - 307 - 3100 FAX: 630 - 307 - 2687 LENBROOK INDUSTRIES LIMITED 633 GRANITE COURT, PICKERING, ONTARIO L1W 3K1 CANADA PHONE : 905 - 831 - 6333 FAX: 905 - 831 - 6936 MARANTZ EUROPE B. V. P.O.BOX 80002 BUILDING SFF2 5600

8、JB EINDHOVEN THE NETHERLANDS PHONE : +31 - 40 - 2732241 FAX: +31 - 40 - 2735578 SUPERSCOPE TECHNOLOGIES, INC. MARANTZ PROFESSIONAL PRODUCTS 2640 WHITE OAK CIRCLE, SUITE A AURORA, ILLINOIS 60504 USA PHONE : 630 - 820 - 4800 FAX: 630 - 820 - 8103 TC ELECTRONICS CANADA LTD. 540 FIRING AVE. BAIE DURF, Q

9、UEBEC H9X 3T2 CANADA PHONE : 514 - 457 - 4044 FAX: 514 - 457 - 5524 MK ENTERPRISES LTD. 2F SHINHAN BLDG., 247-17 SEOKYO-DONG MAPO-KU, SEOUL KOREA PHONE : +82 - 2 - 323 - 2155 FAX: +31 - 2 - 323 - 2154 MARANTZ BRAZIL CAIXA POSTAL 21462 CEP 04698-970 SAO PAULO, SP , BRAZIL PHONE : 0800 - 123123 FAX: +

10、55 11 534. 8988 PAl- YUING CO., LTD. 6 TH FL NO, 148 SUNG KIANG ROAD, TAIPEI, 10429, TAIWAN R.O.C. PHONE : +886 (2) 5221304 FAX: +886 (2) 5630415 MRZ STANDARD CO., LTD. 746 - 754 MAHACHAI RD., WANGBURAPAPIROM, PHRANAKORN, BANGKOK, 10200 THAILAND PHONE : +66 - 2 - 222 - 9181 FAX: +66 - 2 - 224 - 6795

11、 WO KEE HONG ELECTRONICS SDN. BHD. NO. 102 JALAN SS 21/35, DAMANSARA UTAMA, 47400 PETALING JAYA SELANGOR DARUL EHSAN, MALAYSIA PHONE : +60 3 - 7184666 FAX: +60 3 - 7173828 MARANTZ JAPAN, INC. 35- I , 7- CHOME, SAGAMIONO SAGAMIHARA - SHI, KANAGAWA JAPAN 228-8505 PHONE : +81 42 748 1013 FAX: +81 42 74

12、1 9190 FORWARD MARKETING (S) PTE. LTD. 23, LORONG 8, TOA PAYOH, SINGAPORE 319257. PHONE : +65 2583640 FAX: +65 3564047 SHOCK, FIRE HAZARD SERVICE TEST : CAUTION : After servicing this appliance and prior to returning to customer, measure the resistance between either primary AC cord connector pins (

13、 with unit NOT connected to AC mains and its Power switch ON ), and the face or Front Panel of product and controls and chassis bottom. Any resistance measurement less than 1 Megohms should cause unit to be repaired or corrected before AC power is applied, and verified before it is return to the use

14、r/customer. Ref. UL Standard N0. 1492(DR700) and No. 813(CDR630). USACANADAEUROPE / TRADING USACANADA BRAZIL (Discagem Direta Gratuita) TAIWAN THAILAND MALAYSIA In case of difficulties, do not hesitate to contact the Technical Department at above mentioned address. JAPAN TechnicalSINGAPORE 98110MIT

15、SCAN AUDIO PTY. LTD. 52 CROWN STREET, RICHMOND 3121 VICTORIA AUSTRALIA PHONE : +61 - 3 - 9429 - 2199 FAX: +61 - 3 - 9429 - 9309 AUSTRALIA / NEW ZEALAND KOREA RadioFans.CN 收音机爱 好者资料库 1. TECHNICAL SPECIFICATIONS FM Tuner Frequency range. 87.5 108.0 MHz F only . 76.0 90.0 MHz Sensitivity . 21.2 dBf / 3

16、.2 V S/N (Mono/Stereo). 75 / 43 dB F only . 70 / 50 dB THD (Mono/Stereo) .1.5 / 1.5 % MW Tuner Frequency range. 531 1602 kHz U only . 530 1700 kHz Sensitivity . 500 V / m /02, F only . 400 V / m S/N. 50 dB LW Tuner Frequency range. 153 279 kHz Sensitivity . 1800 V / m Amplifier Music power. 25 W + 2

17、5 W (4) Input sensitivity (AUX) .310 mV / 47 k U only .250 mV / 47 k S/N (AUX) . 85 dB CD Player Channels . 2 channels Frequency response .20 20,000 Hz 3 dB S/N.82 dB (1000 Hz) THD .0.04 % (1000 Hz) Output level.2 V RMS General Power supply /02 version. AC 230 V, 50 Hz F version .AC 100 V, 50Hz / 60

18、 Hz K version . AC 110V / 220 V, 50Hz / 60 Hz KK version. AC 220 V, 60 Hz U version . AC 120 V, 60 Hz Power consumption .25 W Power failure backup time .APPROX. 15 min. Dimensions . 450(W) x 104(H) x 308(D) mm Weight. 5.8 kg Table top Speaker LS2021 Speaker Mid-bass .4” Dome tweeter.3/4” Input power

19、 Rated . 25 W (6) Max. . 40 W (6) Frequency response .80 20,000 Hz 6 dB Dimensions . 190(W) x 200(H) x 100(D) mm Weight. 1.5 kg Design and specifications are subject to change without notice. 1-1 RadioFans.CN 收音机爱 好者资料库 2-1. HOW TO DISASSEMBLE MR2020 1. Take the bottom case (001G) apart (1) Turn MR2

20、020 upside down by the jig (Refer to fig.1-3). Take care that the top cover will not damaged, especially the 4 levers. If you dont have the jig, you prepare to put some magazine or telephone guide under the MR2020 (The height is over 3cm books). Fig.1 A jig for MR2020 (2) Remove 15 screws as shown i

21、n fig.4. Fig.2 The jig on MR2020Fig.3 Turning over the MR2020 2-1 Fig.4 Position of 15 screws (3) While lifting the bottom case, remove the rear panel as shown in fig.5-6. Fig.5 Lifting the bottom case (4) Remove the mains code bush as shown in fig.7. Fig.6 Removing the rear panel 2-2 Fig.7 Removing

22、 the mains code bush (5) Lift up the bottom case, remove the put the one with turning to front side (Refer to fig.8). Remark for reassemble When you fit the bottom case, remove the lid of the bottom case (Refer to fig.9) and confirm the arrangement of lead lines for transformer.(Refer to fig.10). Fi

23、g.9 Removing the lid of the bottom caseFig.10 Arrangement of lead lines 2-3 Fig.8 Taking the bottom case apart 2. Take the top panel (001D) apart (1) Turn MR2020 upside down by the jig. (Refer to fig.1-3) Take care that the top cover will not damaged, especially the 4 levers. If you dont have the ji

24、g, you prepare to put some magazine or telephone guide under the MR2020. (The height is over 3cm books) (2) Push the rear panel while keeping hold the top cover (see fig.11 below). The top cover will move 5mm. (fig.12-13) Now, 4 screws on the top cover will become accessible. (fig.14) Take out these screws. (M3 type screw) Fig.11 Pushing the rear panel Fig.13 Pushed the rear panel Fig.12 Before pushing the rear panel Fig.14 Positions of 4 screws 2-4 (3) Turn the MR2020 to its normal operating position. (4) Op