Marantz-4270-rec-om维修电路原理图.pdf

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1、RadioFans.CN 收音机爱 好者资料库 Model 4270 Stereo 2+Quadradial 4 R Receiver MARANTZ CO., INC.P.O. BOX 99SUN VALLEY, CALIFORNIA91352 A WHOLLYOWNED SUBSIDIARY OF SUPERSCOPE INC., SUN VALLEY, CALIFORNIA 91352 RadioFans.CN 收音机爱 好者资料库 WAR A All parts of MARANTZ products are fully guaranteed for a period of THREE

2、 YEARS from date of purchase, except for tubes which are guaranteed for NINETY DAYS from date of purchase, and except for speaker products. Speaker products are guaranteed.as follows: all speaker and electronic components are fully guaranteed for a period of THREE YEARS from date of purchase; the ca

3、binetry Is guaranteed against manufacturing defects on ly, for a period of TWO YEARS from date of purchase. In the event that service is requ ired, all necessary parts and labo r will be furnis hed free of charge during the above stated periods. The conditions of this Warranty, and the extent of the

4、 responsibilitY of MARA NTZ COMPANY, INC. under this War;anty, are as follows: 1, The purchase must have been made from an authorized MARANTZ dealer. 2, The Warranty extends only in favor of the original, registered ownerof the prod uct. 3. The Warranty Registration Card must be transmitted to MARAN

5、IZ COMPANY, INC., P. O. Box 99, Sun Valley, California 91352, not later than TEN DAYS from date of purchase. . 4. The Warranty will become void if repairs are effected by anyone other than an authorized MARANTZ Service Station. 5. If it becomes necessary to send this product or any defective part to

6、 MARANTZ COMPANY, INC., or to an authorized MARANTZ ServiceStetion, all shipping charges must be fullv prepaid. If the entire instrument is sent, it must be shipped in its original package. No accessories should be shipped with the product. If any accessories are shipped with the product. MARANTZ CO

7、MPANY, INC. shall have no liability whatsoever for loss of or damage to any such accessories, nor for the safe-return th ereof. 6. This Warranty shall be valid only if the purchase was made within the United States of America. The Warranty shall not apply unless shipment is made by the purchaser to

8、the MARANTZ Service Station from a point within the United States. If the requested repairs and/or parts exchange are within the terms of this Warranty, MARANTZ COMPANY. INC. will prepay return shipping charges, provided that such return shipment is to be made to an address located within the United

9、 States. 7. This Warranty is void if the Serial Nunter has been altered or removed. This Warranty shall not apply if the product has not been conne c ted or operated in accordance with the instructions furnished by MARANTZ COMPANY, INC. This Warranty shall also be void if the product has been altere

10、d or repaired in any way which MARANTZ COMPANY, INC. believes has affected the stability or reliability of the product. 8. MARANTZ COMPANY, INC. shall have no liability whatsoever for consequential da mages. The sole responsibility of MARANTZ COMPANY, INC. under this Warranty sha ll be limited to th

11、e repair of the prod uct, or replacement thereof,in the sole discretion of MARANTZ COMPANY, INC. 9. This Warranty does not include the furnishings of labor or parts for user mainte nance, as the same is described in the instruction manual or handbook furnished with this product, 10. This Warranty is

12、 valid only with respect to repairs effected by an aut hor ized MARA NTZ Service Station. 11. EXCEPT TO THE EXTENT THAT APPLICABLE LAW PRECLUDES A DISCLAIMER OF WARRANTY, THERE IS NO IMPLI ED WARRANTY O F MERCHANTABILITY OR FITNESS WITH RESPECT TO THIS PRODUCT, NOR ARE THERE ANY OTHER WARRANTIES WHI

13、CH EXTEND BEYOND THE PROVISIONS OF THIS WARRANTY. ORDINARY PERIODIC CHECKUPS ARE NOT INCLUDED IN THIS WARRANTY. 12. MARANTZ COMPANY, INC. reserves the right to make chariges .ln design and/or improvements upon its products without any obligation to include these changes in any products theretofore m

14、anufact ured. TO PROTECT YOUR RIGHTS UNDER THIS WARRANTY. FILL OUT AND MAIL THE WARRANTY REGISTRATION CARD TO MARANTZ COMPANY, INC., P.O. BOX 99, SUN VALLEY, CALIFORNIA 91352, NOT LATER THAN TEN DAYS FOLLOWING THE DATE OF PURCHASE. Should there be any questions, please contact the Marantz National S

15、ervice Manager, Marantz Company, Inc. P.O. Box 99, Sun Valley, California 91352 PURCHASE S RECD 0 REGISTRATION FOR MARANTZ 3-YEAR GOLDEN WARRANTY Model: Marantz Model 4270 Serial No. _ Purchasers Name _ Purchased From (Name) _ Address _ Price Paid $ - Date Purchased _ Date Warranty Reply Card Mailed

16、 _ The above information becomes your permanent record of a valuable purchase. It should be promptly filled in at the same time that you fill in and mail the warranty registration reply card to Marantz. This information provides a valuable insurance record and must also be referred to should you hav

17、e any correspondence with Marantz. RadioFans.CN 收音机爱 好者资料库 TABLE OF CONTENTS Connecting the 4270 2 Source Devices 4 Remote Speakers 4 Speaker Phasing 5 Speaker Placement 5 Front Panel Features 7 Mode Switch 7 Dimension 8 SQ Decoder 8 Balance Controls 8 Selector Switch 8 Bass, Mid and Treble Controls

18、 8 Monitor Switch for Tape 1!Tape 2 8 Monitor Switch for Tape/Source 8 Main and Remote Spkr Switches 9 Power Switch 9 Front and Rear Phones Jacks 9 Loudness 9 Hi Filter Switch 9 Tuning Meter 9 Tuning 9 FM Muting Switch 10 Volume 10 Dolby Switch 10 Record Level (L) (R) 10 Play Cal. (L) (R) 10 400Hz T

19、one Switch 10 Rear Panel Features 11 Phono Jacks 11 CD-4/AUX Jacks 11 Tape Monitor In and Tape Monitor Out Jacks 11 FM Antenna Terminals 11 AM Antenna Terminal 11 FM Quadradial Output Jack 12 FM De-Emphasis Switch 12 Dolby FM Preset Level Controls 12 Muting Level Control 12 Power Mode Switch 12 Pre

20、Out, Main In Jacks 12 Connecting an External Amplifier for Rear Channels 12 Connecting an External Amplifier for Front Channels 12 Chassis Ground Binding Post 12 Main and Remote Speakers 12 Connection to AC Outlet 13 AC Convenience Outlets 13 Remote Control 13 External Decoder Connection 13 Tape Rec

21、ording 13 Basic Dolby Process 14 Dolby Calibration 14 Procedure for Playback Calibration 14 Procedure for Record Calibration 15 Use of the Dolby System on FM Broadcasts 16 FM De-Emphasis Switch 16 Dolby Mode Chart 16 Technical Description 18 General 18 Functional Description 18 Frond End 18 IF Stage

22、s 18 Limiter 18 FM Stereo Demodulator 18 Muting Circuit 18 AM Tuner 18 Phono Amplifiers 19 Selector Switch 19 Monitor (Tape/Source) Switch 19 Monitor (Tape 1 or 2) Switch 19 Tone Control 19 Power Amplifier 19 General Requirements 19 Installation of Walnut Cabinet 20 Service Notes 20 LIST F ILLUSTR A

23、TIO NS 1. Rear Panel Connection Facilities and Adjustments 2 2. Loudspeaker System Connections 3 3. Connection Diagram 4 4. Speaker Placement 6 5. Mono Mode Sound Dispersion 7 6. 2-channel Mode Sound Dispersion 7 7. Discrete Mode Sound Dispersion 7 8. Vari-Matrix Mode Sound Dispersion 7 9. Front Pan

24、el Controls and Jacks 8 10. Stereophone Plug 9 11. FM/AM Antenna Connections 11 12. AM Ferrite-rod Antenna 11 13. Quick-Connect Speaker Terminal 13 14. Block Diagram 17 15. Packing Instructions 20 TABLE 1. Dolby Mode Chart 16 RadioFans.CN 收音机爱 好者资料库 GENERAL DESCRIPTION Your Marantz Model 4270 is a h

25、igh-quality Stereo 2 + Quadradial 4 Receiver developed by Marantz, a name famous for quality in the audio com ponent industry. The Model 4270 incorporates Marantz exclusive Vari-Matrix circuit which sim ulates 4-channel sound from normal 2-channel stereo programs, and is capable of reproducing 4-cha

26、nnel sound from any matrix-encoded source. The 4270 will also reproduce any discrete 4 channel program as well as regular stereo and monaural programs. An optional plug-in decoder adapts the 4270 for any specific matrix system such as Columbias SQ. The FM tuner section employs an FET for the RF amp

27、and Mixer stage. The IF tuning circuit employs ceramic filters of wide bandwidth and high selectivity to provide high sensitivity and unparalleled interference-free operation. The 4270 incorporates a switchable 2-channel DOLBY system to reduce noise, inherent in recording music from records, tape, F

28、M broadcasts and TV. The FM multiplex circuitry includes a phase locked loop Stereo-Monaural Automatic switching circuit, stereo indicator circuit and a buffer amplifier to obtain output at low impedance. Low pass filters for 19KHz and 38KHz rejection are incorporated. Moreover, the Model 4270 unit

29、has a muting cir cuit that permits pleasant FM broadcast reception by completely eliminating inter-station inter ference which is usually generated at the time of selecting FM stations. FO REWORD To obtain optimum performance and enjoyment from the Model 4270, please study these instruc tions carefu

30、lly. Follow the step-by-step instruc tions to obtain maximum performance. The manual is divided into two parts. The first covers installation and operation in simple, non technical language. The second describes the Model 4270 in more detail with technical specifi cations and functional explanations

31、. For quick identification of the controls and connections, references are printed in bold face type. AFTER UNPACKING It is advisable to save all original packing material to prevent damage shouId you wish to transport or ship the Receiver (refer to Figure 15 for pack ing instructions). Please inspe

32、ct your Model 4270 carefully for any signs of damage in transit. It has undergone stringent quality control inspec tion and tests prior to packing, and left the factory in perfect operating condition. If the unit is damaged, notify the carrier without delay. Only the consignee may institute a claim

33、with the carrier for damage during shipment. How ever, the Marantz Company will co-operate fully in such an event. Save the damaged carton as evidence for inspection by the carrier. RadioFans.CN 收音机爱 好者资料库 CONNECTING THE 4270 The 4270 can be used as a stereo or 4-channel Receiver. When using the 427

34、0 as a stereo unit, the POWER MODE Switch on the rear panel should be placed in the 70Wx2 mode. The instructions contained in this manual are to be followed for both stereo or 4-channel operation; however, for stereo operation, the front channels alone will apply. 1. Using a balanced and shielded 30

35、0 Ohm cable, connect an FM antenna to the 4270 as shown in Figure 11. 2. Using No. 18, or heavier, lamp cord (zip cord), connect main speakers to the 4270 as follows: LEFT FRONT SPEAKER 4270 - or GND or NEG or COMM or 0 to MAIN SPEAKERS FRONT L + or HOT or POS or 1 to MAIN SPEAKERS FRONT L+ RIGHT FR

36、ONT SPEAKER 4270 - or GND or NEG or COMM or 0 to MAIN SPEAKERS FRONT R + or HOT or POS or 1 to MAIN SPEAKERS FRONT R+ LEFT REAR SPEAKER 4270 - or GND or NEG or COMM or 0 to MAIN SPEAKERS REAR L + or HOT or POS or 1 to MAIN PSEAKERS REAR L+ Figure 1. Rear Panel Connection Facilities and Adjustments R

37、IGHT REAR SPEAKER 4270 - or GND or NEG or COMM or 0 to MAIN SPEAKERS REAR R + or HOT or POS or 1 to MAIN SPEAKERS REAR R+ CAUTION: When using the 4270 in the 70 W x 2 mode, do not use 4 Ohm speakers use 8 Ohms or higher. 3. Using shielded audio cables with phono plugs, connect your record player to

38、the 4270 as follows: RECORD PLAYER 4270 LEFT OUTPUT to PHONO L RIGHT OUTPUT to PHONO R 4. If a discrete 4-channel playback device (0-8 cartridge player, 4-channel reel-to-reel player, CD-4 discrete disc demodulator, etc.), is to be engaged in the system, make connections be tween the device and the

39、4270 using shielded audio cables with phono plugs. DISCRETE 4CHANNEL 4270 PLAYBACK DEVICE LEFT-FRONT or LF or CHANNEL 1 or TRACK 1 to FRONT CD4/AUX L LEFTREAR or LR or CHANNEL 2 or TRACK 2 to REAR CD-4/AUX L RIGHT-FRONT or RF or CHANNEL 3 or TRACK 3 to FRONT CD4/AUX R RIGHT-REAR or RR or CHANNEL 4 o

40、r TRACK 4 to REAR CD-4/AUX R 2 RadioFans.CN 收音机爱 好者资料库 I II II REAR SPEAKER SySTEM RPEAT WIRING AS FOR FRONT sPEAKER SYSTEM LEFT Figure 2. Loudspeaker System Connections 5. Using shielded audio cables with phono plugs, connect a discrete 4-channel tape recorder to the 4270 as follows: DISCRETE 4-CHA

41、NNEL 4270 TAPE RECORDER LEFT-FRONT OUTPUT or LINE OUT to FRONT TAPE MONI TOR IN L LEFT-REAR OUTPUT or LINE OUT to REAR TAPE MONI TOR IN L RIGHT-FRONT OUTPUT or LINE OUT to FRONT TAPE MONI TOR IN R RIGHT-REAR OUTPUT or LINE OUT to REAR TAPE MONI TOR IN R LEFT-FROIH INPUT or LINE IN to FRONT TAPE MONI

42、 TOR OUT L LEFT-REAR INPUT to LINE IN to REAR TAPE MONI TOR OUT L RIGHT-FRONT INPUT or LINE IN to FRONT TAPE MONI TOR OUT R 3 RIGHT-REAR INPUT or LINE IN to REAR TAPE MONI TOR OUT R 6. Pull the AM ferrite-rod antenna out as shown in Figure 12. 7. Set the controls and switches as follows: FRONT L-R B

43、ALANCE REAR L-R BALANCE FROIlTREAR BALANCE MODE DIMENSION BASS and TREBLE Controls VOLUME MAIN SPKR REMOTE SPKR FM MUTING MONITOR (TAPE/SOURCE) HI FILTER LOUDNESS DOLBY 400Hz TONE POWER 8. Plug the 4270 into the AC wall outlet. 9. Turn the POWER Switch ON. 10. Select the desired program source by se

44、tting the SELECTOR Switch to appropriate posi tion. Mid position Mid position Mid position VARIMATRIX Mid position Mid position Minimum (fully counter clockwise) ON (in) OFF (out) ON (in) SOURCE (out) OFF (out) OFF (out) OFF OFF (out) OFF (out) RadioFans.CN 收音机爱 好者资料库 I I FRONT RIGHT REAR IlEFT REAR

45、 RIGH T II FRONTLEF T f RONT 11. If phono is selected, put on a stereo record. If FM is selected, tune to a stereo broadcast. 12. Increase the VOLUME control to a comfort able listening level. Your complete 4-channel or stereo system is now operative, and you may experiment with the vari ous control

46、s to discover their effects. The remainder of this manual explains how to use your system most effectively. SOURCE DEVICES 2-channel A stereo record player may be connected to the PHONO jacks. High level 2-channel playback devices (tuner, tape player, record player with equalized high level output,

47、etc.) may be connected to the FRONT TAPE MONITOR and CD4/AUX IN PUTS. 00 IS: lS5 00 2CHANNEL TAPE RECORDER 2CH TAPE RECOR.DE MAT8 CONNECTED TO THE FfOr4 T lUT ,oHD RIGHT CHANNEL TERM.lMAlS TAPE t ) , I 00 1D 1D00 OO!SJ ISJOo 4CHANNEL TAPE RECOROER TAPE 2 . RIG HT 1lJ lS:l11S5 EBI 000000 I IREAR LEFT

48、 REAR TAPE DECK 4CHANNEL RIGHT 4-channel Discrete 4-channel playback devices (0-8 cartridge player, 4-channel reel-to-reel player, CD-4 discrete disc demodulator, etc.) may be connected to the CD-4/AUX, TAPE MONITOR 1 or TAPE MONI TOR 2 input jacks. REMOTE SPEAKERS The 4270 can accommodate both main

49、 and remote speaker systems. A second group of four speakers may be set up in another room. Connect these four remote speakers to the RE MOTE SPEAKERS terminals as you did the main speakers. The MAIN and REMOTE SPKR Switches on the front panel now permit activation of MAIN and/ or REMOTE groups of loudspeakers. NOTE: Do not use 4-0hm speakers if main and remote speakers are to be used si