Sansui-AU70-int-sm2 电路图 维修手册.pdf

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1、OPERATING INSTRUCTIONS - 0 . TONE DEFEAT z 0 w -2 0 . en , - Z . A . -6 - 10 -8 -OU TPUT : I W - 0: -10 -OU TPUT : 20W -20 MIN I II 1111 -12 1 I I I 1111 100 I K 10 K 10 1 00 I K 10K lOOK HIGH AND LOW FILTER CHARACTERISTICS HARMONIC DISTORTION I I I I I I I I I 10 I J Ntt tfET 10 -HARMONIC I Ke ;- e

2、 _ DISTORTION 100% LOAD RESISTANCE : 160HMS - 0 -1- z _ .-10Ke r-0 w ;: -10 HIGH FILTER Q: 0 5 0 LOW FILTER . -, . !? -20 c II) Q: I :J - 30 1 ., -,. - 100 I K 10K o I 5 10 15 20 25 INPUT AND OUTPUT CHARACTERISTICS INTER MODULATION DISTORTION I I I I I I I I 10 5.5Ke+50% LOAD RESISTANCEI60HMS 25 / e

3、 INPUT : MAIN / z NF: 26db LOAD Q RESISTANCE: 160HMS . 10 :5 5 . - !? II c . : 1 -. : II 1 5 10 15 20 0 I / V 0.3 I 2 -6- Downloaded from www.M manuals search engine CONNECTIONS SPEAKER STEREOPHONIC REPRODUCTION Connect (+) of the right-hand speaker to the 8-or 16-ohm terminal of the upper R termina

4、ls on the back of the amplifier. Connect (- ) of the right-hand speaker to (C) of the upper R terminals. Connect (+) of the left-hand speaker to the 8-or 16-ohm terminal of the lower L terminals on the back of the amplifier. Connect (-) of the left-hand speaker to (C) of the lower L terminals. MONAU

5、RAL REPRODUCTION When you use an 8-ohm speaker system for mon- aural reproduction, connect the upper and lower 16-ohm speaker terminals of your amplifier to the (+) terminal of the speaker. Connect the upper and lower (C) speaker term i- 0 , O 0 0 0 0 0 15 ;:.,/- P,), 1-= Lt: L .c .;. Q; O Q) 0; C Q

6、; C e nals of your amplifier to the (- ) terminal of the speaker. THREEDIMENSIONAL STEREO PHONIC REPRODUCTION Your AU-70 is equipped with a terminal for a center-channel amplifier so that it can be used for three-dimensional reproduction. To do this, connect the input terminal of a monaural amplifie

7、r (Either a main or combination amplifier can be used) to the pin-jack of the center-channel output terminal at the left of the speaker terminal board with a shielded wire The center-channel mixes the right and left sounds to produce the three-dimensional effect. Speakers suitable tor the AU-70 are

8、20 to 30-cm coaxial speakers and, for the best musical repro- -7- duction, two or three-way speaker systems which use different speakers for different frequency ranges. In choosing the cabinet, take account of tonal quality in addition to design. CAUTION: If you find that the sounds from both speake

9、rs do not mix well, but leave a sort of vacuum midway between the speakers, you can conclude that the amplifier and the speakers do not match in polarity (phase). In such a case, reverse the (+) and (-) connections of either speaker. When you use two pairs of speakers for stereo- phonic reproduction

10、, make sure that the speaker output terminal connections do not cause contact between Rand L and that the terminals are connected properly. If the connections are faulty, your amplifier will not work normally and may also go out of order. i Player (magnetic) Player (crystal) RECORD PLAYER 1. Connect

11、 the output terminals to the PHONO- R and PHONO-L terminals (in the case of monaural reproduction, to either of these terminals) on the back of your amplifier with shielded wires. 2. Set the cartridge switch on the back of your amplifier to MAG or X-TAL according to the type of your cartridge. 3. Co

12、nnect the power-cord plug of the player to the power plug receptacle on the back of your am plifier. MICROPHONE Connect the microphone to R or L of the MIC terminals on the back of your amplifier. When you use two microphones, connect olle to Rand the other to L. , Microphone 8- CARTRIDGE SWITCH Set

13、 this to MAG or XTAL depend. ing on your player cartridge (magnetic or crystal) , . Downloaded from www.M manuals search engine CONNECTIONS TUNER You can listen to broadcasts easily by connecting your amplifier to a tuner and MPX adaptor. A) STEREO TUNER Connect tuner output to the Rand L TL:NER ter

14、minals on the back of your am pi i fier. 8) MONAURAL TUNER Connect tuner output to either R or L of the TeNER- terminals on the back of your amplifier. C) FM MONAURAL TUNER AND FM-M PX ADAPTOR. Connect monaural tuner outjJut to the input terminal of the F:l-lPX adaptor anc! connect Rand L of the ada

15、ptor output terminals to R AM/fM/MPX TUNER (SANSUI TU70) and L, respectiely, ot the AUX terminals on the back of your amplifier. TAPE RECORDER 1. SINGLE-CONNECTION TAPE RECORDER (DIN STANDARD SPECIFICATION): Connect the in,lde-connection connector to the TAPE-IEC receptacle on the back of your ampli

16、fier. 2. PIN-JACK TAPE RECORDER a) Recording Connect the tape relorcier input ternlinais to R and L (R or L in the lase of monaural opera- tion) of the REC terminals on the back of your amplifier ith shielded wires, b) Playback e CENTER Ii rI Q It o 16 eQ C CHANOllT Ii G). fM TUNER (B) or (C) MPX AD

17、APTOR (C) 9 - Connct the tape recorder output terminal (LINE) to Rand L (R or L in the case of monaural operation) of the TAPE MON terminals on the back of your amplifier. 3. Playing tapes on the tape deck Connect the tape deck output terminals to R and L (R or L in the case of monaural opera- tion)

18、 of the TAPE HEAD terminals on the back of your amplifier. 4. Monitoring with a three-head tape re- corder a) Single-connection tape recorder Connect the single-connection T APE-REC receptacle on the amplifier. b) Pin-jack tape recorder Tape-deck plug to the back of your -10- Connect the tape record

19、er input terminals to R and L (R or L in the case of monaural opera- tion) of the REC terminals on the-back of your amplifier. Also, connect the tape recorder output terminal LINE to Rand L (R or L in the case of monaural operation) of the TAPE MON terminals on the back of your amplifier. CENTER . Q

20、 o I Bll CHANOllT . D G). Downloaded from www.M manuals search engine SWITCHES AND CONTROLS CD POWER INDICATOR T his lights up yvhen power is being sup- plied. It remains on while the amplifier is in operation. HEADPHONE JACK When you want to avoid disturbing others or when you use the amplifier as

21、a monitor, connect headphones to this jack. You can still enjoy stereophonic reproduction through the head phones. For this pur- pose, you can use any type of headphones or earphones if its plug fits into the jack. But use dynamic headphones designed for stereophonic reproduction, if possible. SPEAK

22、ER (SPEAKER OFF) When you use headphones with the head- phone jack, set this switch to OFF to cut off sound to the speakers. This feature enables you to enjoy stereophonic repro- duction without disturbing others. PRESENCE If the Tone Control alone is used for bass compensation, slightly higher freq

23、uencies are compensated at the same time. To avoid this, turn this switch ON _ This sets the turnover at 150 cps, changing speaker damping and frequency response characteristics to compensate bass. As a result, all sounds become impressive and you can enJoy clear, magnificent bass. POWER This switch

24、 is used for connecting and disconnecting the power supply. Push the .button for poweL Push it again to shut it off_ The switch also activates and de- activates the power-supply plug receptacles on the back of the amplifieL CD HEO PHON POWER ow . TER -11 OUTPUT LEVEL METERS The right and left meters

25、 indicate the out: put levels of the right and left speakers, respectively. Since output is shown separately for each channel, the meters provide easy balance adjustment. Besides, you can watch changes in the output of each channel during ope- ration. Each meter can be set to any of the three ranges

26、 of 5, 10 and 25 watts by means of the output-level meter switch on the back of the amplifieL Choose the appropriate range according to the output YOU want. -hen the MODE switch is set io R (or L), t he meter for L (or R) does not york. (J) LOUDNESS -hen sound olume is at a low level, you ieel as if

27、 bass and treble are missing. In such a case, turn this switch ON to compensate bass and treble. This will make you feel as if you were present at an actual concert, LOW FILTER (for eliminating low-frequency noise) . Turn this 5witch ON to reduce phono motor and other unpleasant low-frequency nOIses

28、. HIGH FILTER (for eliminat- ing high-frequency noise) Turn this switch ON to reduce relatively high-frequency noise, such as the scratch from recorels made of poor material or noise due to fluorescent lamps in the case of the tuner. ) TONE DEFEAT Turn this switch ON to open the tone control circuit

29、s_ Then the frequency re- sponse cure of the amplifier will become perfectly flat. , 1 TAPE MONITOR vVhen you make recordings with a three- head tape recorder, turn this switch ON to use the am pI ifier as a monitor. Then the sounds recorded on the tape are re- produced while you are recording. Keep

30、 this switch ON when you play the tape on the tape .recorder. Be sure to keep the itch OFF other- wIse. BALANCE Th is knob is used to adjust the balance of volume between the right and left speakers for the best stereophonic effect. J,1ake the adjustment while watching the output level meters and li

31、stening to the sounds of both speakers. Then the amplifier is adjusted properly, you feel as if the sound comes from a point midway between the two speakers. BLEND This knob permits continuous shift from stereophonic to monaural reproduction. Turn it counter-clockwise to bring repro- duction closer

32、to monaural (R+L). For complete monaural reproduction, turn it as far counter-clockwise as possible. The sounds of the right and left speakers become separated hen you turn the knob clockwise (R and L perform their respective functions). The best stereophonic effect is obtained when you turn it as f

33、ar as possible_ ) BASS and TREBLE for L These control the tone of the left speaker. BASS and TREBLE for R These control the tone of the right speaker. -12- ) VOLUME This knob is used to control the volume of the tuner, records and tapes. Turn it clockwise for louder reproduction. To reduce the 01 um

34、e, turn coun ter-clockwise. SELECTOR (input-selector) TUNER: For receiving broadcasts through the tuner. PHONO: For playing records. MlC: For using a microphone, TAPE HEAD: For playing tapes on the tape c1eck (directly from the tape head). AUX: For reproducing oice input or using the MPX adaptor. MO

35、DE (Stereophonic/ monaural switch) This switch is used to shift from stereo- phonic t6 monaural reproduction or vIce versa. STEREO: Set the switch at this position for stereo reproduction. Signals fed into A come out of As speaker and those fed into B come out of Bs speaker. STEREO-REV: This positio

36、n, too, is for stereo reprocluction. But signals fed into A come out of Bs speaker and those fed into B come out of As speaker. Choose this position when the right and left are reersed in reproduction. L+ R: Signals fed into Land H. are blended into one (L+ R) in the amplifier before they come out s

37、eparately from Land R. Signals fed into A and 13 become A+B in the amplifier and come out of the speakers of A and 13 in the form of tbe combined sound A+B. R (Mono R): Signals fed into A come out of As and Bs speakers. Use this posi- tion for reproducing mono broadcasts and tapes. L (Mono L): Signa

38、ls fed into B come out of As and Bs speakers. This position is rarely usecl. Downloaded from www.M manuals search engine OPERATIONS RECORD PLAYING 1. Set the SELECTOR switch at PHONO. 2. Set the MODE switch at STEREO or STEREO-REV (at R or L in case of mon- aural operation). 3. Switch on the player,

39、 put on a record and adjust the number of revolutions as necessary before placing the pickup on the record. 4. Balance the sounds from both speakers by means of the BALANCE knob while watching the output level meters. .5. Adjust the amount of sound by means of the VOLUME knob. Other adjusting knobs

40、and switches can be used to get the most satis- factory repreduction. When you play a monaural record on a stereo record player, follow the same procedure as for stereo records. This will give you better results. Catridges are either magnetic or crystal. Both can be used with the AU-70, but, if poss

41、ible, use a magnetic type for the highest fidelity. If you feel that right and left are reversed when playing a stereo record, turn the MODE switch to STEREO-REV. To balance the sounds from both speakers, play a monaural record in the same way as a stereo record and adjust the BALANCE switch in such

42、 a way that you feel that the sound comes from a point midway between the right and left speakers. In this case, you can count on the output level meters for a rough determination of the balance. Also, make sure that the BLEND knob is kept at the point where it cannot be turned clockwise any further

43、. When you supply power to the player from the power-plug receptacle on the back of your amplifier, do not forget that the player is switch- ed off when you switch off the amplifier. BROADCASTS In the case of A and B above: 1. Set the SELECTOR switch at TUNER. 2. Set the MODE switch at STEREO or STE

44、REO-REV in the case of A and at R or L (according to the channel selected) in the case of B. 3. Tune in with the tuner. 4. Use other adjusting knobs and switches to get the most satisfactory performance. In the case of C 1. Set the SELECTOR switch at AUX 2. Set the MODE switch at STEREO or STEREO-RE

45、V. 3. Tune in with the tuner. 4. Prepare the FM-MPX adaptor for stereophonic reception. 5. Use other adjusting knobs and switches to get the most satisfactory performance. When you use a tuner or FM-MPX receiver, read the instructions for them carefully. There should be no mistakes in connections an

46、d operation. When you usc our T U -70, follow the instructions for A. When you use an FM-tuner (without Multiplex) and MP2, follow the instructions for C. USE A MICROPHONE You can use microphones with your AU-70 amplifier. Any high-impedance (50 kilo-ohm) crystal, dynamic or velocity microphone is a

47、ccept- able. 1. Set the SELECTOR switch at MIC. 2. Set the MODE switch at STEREO (when you use only one microphone for stereo- phonic effect) at R (when you use only one microphone for monaural reprod uction), or at L+ R (when you mix two different pro- -13- gram sources from two microphones.) 3. Du

48、ring stereophonic operation, you can use the BLEND knob for mixing purposes. 4. Other adjusting knobs and switches can be used for the most satisfactory reproduction. Remember that your AU70 accepts only high- impedance microphones. You cannot get the best performance if you use too long micro- phon

49、e cord, which causes arious problems and reduces treble. Your amplifier has separate tone controls for right and left speakers. You will find this feature very useful when you use one micro- phone for music and another for voice. Further- more, it gives added ,ersatility to your amplifier, particularly when