Roland SVC-350 Vocoder Service Manual 电路图.pdf

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1、SVC-350 SERVICE NOTES SPECIFICATIONS ROLAND VOCODER Modal SVC-360 INPUTS MIC INPUT: 1/4 inch STANDARD snone Jack or EIA-RS297 Connector iciOOonm. -54dBm mm.) INSTRUMENT INPUT: 1/4 men STANDARD Phone Jack HOOkonm, OdB max.) QUrTAR INPUT: 1-4 inch STANDARD D*.one Jack dOOkonm. GUITAR flaw level.)-lOdB

2、mi75OmV) INSTRUMENT LEVEL SELECTOR Switch (OdBm. -i5dBm, -30dBm) Jack HLJ-OI9-01-030 (O09-046) Jack HLJ-O2 46-01-030 (O09-030) INPUT LEVEL INDICATORS: .ED DISPLAY 5 MIC LEVEL. Green. Red/over INSTRUMENT LEVEL. Green Red over GUITAR LEVEL. Green Red/over OUTPUTS For GUITAR AMPLIFIER: 1/4 inch STANDAR

3、D Phone Jack ( lOkohia) MONO or STEREO OUTPUTS: 1/4 inch STANDARD Phone Jack Knot no.44 (016-044) Pot. 3VH6PA361C14 (026-161) CONTROLS MIC LEVEL CONTROL (,-5413111 to -14dBm) POWER CONSUMPTION: 13W DIMENSIONS: 482(W) x 92(H) x 350(0) mm WEIGHT: 5 3kg Knob no.77 (016-077) Pot. 3WJEJA320B14 (026-155)

4、Pot. EVH8MA361A14 (026-163) Jack HLJ-024-01-030 (009-030) Switch SSM-02308 (001-196 Knob no.77 (016-077) rot. EVEEQA361314 (O26-158) Knob no.48 (016-048) Pot. EVHHPS20B14 (029-589) c MACHINE SCREW t- 6-M4X10 BLK Power 3w.tch SDG5P001 (01-156) 100V 3DG5P0C1-2 (01-216) 117V SDG5P5O2 (01-217) 220/240V

5、Button no. 9 (016-009) Panel H58 (072H058) HANDLE 108 H 00 3 RUBBER FOOT K-15U11-C3 CCVER O65HO6O MACHINE SCREW 6-M4X12 BLK Haxaa socket head bolt 4 x czim blk Recectacle ( NC-3PP or I-3M (010-264) MIC AMP Beard AP-127 (141-127/ CONTROL Board Switch SSM-02308 (001-196) Jack HLJ-C264-1-030 (009-OP) L

6、ED TLR-124 (019-028) red TLG-124 (019-029) green Jack HLJ-O261-O1-O3C (009-037) Jack HLJ-O264-O1-C2C (009-040) 1Knob no.44 (016-044) Pot. 3WoEJA320B14 (026-155) OP-142 (149-142) FILTER Board FL-19 (145-019) 100. llV FL-19D (14-C1C)D) 22C 240V i LED Board OP-150 (149-15C) r-Fuse Board OP-143 100V OP-

7、144 117V OP-145 220/24CV Power transformer C22-028N 100V 022-028C 117V 022-028D 220/240V Terminal TT501D-1 (042-032) Ground terminal TT-9-4 (042-041) Printed in Japan A3 1 Scan by Manual Manor RadioFans.CN 收音机爱 好者资料库 Dec. 8,1979 HOLD MIC HOLD IC53 ANALYZER BPF IC5O.55 FL-19 FILTERS SYNTHESIZER FILTE

8、RS OJ7 PEAK METEC7,D*, jncothed to DC voltage by IC5 (pir.3 1-3), ani 7-1 converted by IC4 (.pins 1-3),Q5 Connected acros3 IC43 pins 6 and 7 in parailed with feedback resistors is IC1 3A6CJ. As the mic si-gnai increases, Q5 output current increases,that causes 3A662 conductance to increase, lowering

9、 the gain of IC4 (pins 5-7; to retain either half peak output from $oing above 10V (2OVpp). In thi3 7oc oder, there are two other compressors similar to the Mic compressor ir. configuration: in Guitar preamp ohain and synthesizer filler output channe-. SXPAIJDSR Ihe output -voltage at pin 1 of IC5 i

10、o al30 received oy 3x?ander3 IC17-20, 322 and 32;. The current from 322 323) varies in the same direction a3 in the Compressor, but with thi3 fashion, 3igr.al flew rate through IC13 (IC2G/ is ii- reciy proportional to the control current; the more current flows, the moire signal flows through IC13.

11、ANALYZER FILTSR Ten 3?Fs witri a nign Q consisting of ICs (s. g. IC?G and IC55; covers most of the audio spectrum -3peech signal. The 3ignal from the compressor is pre-emphasized through IC5l?in3 5-7) and fed to the filter bank which slices up the 3pectrum. Each. 3lice goes to a iiode(e.g. D37) wher

12、e its peak is letected, 3moothed and is fed to the 7CA in the next 3tage filter -Synthesiser filter. This i3 a control voltage that is proportional to *.he jtrer-ght of that slice. J /:.rTHE JIZEli ? IL :2h Trie Jyr.thji.r f-itor u a jet f oar.i?- filr-jr, .ier.- ticai to tnose of the Analyzer 3ecti

13、on,iJfed by tne o.n- ii -oming througn either IllSTRUMENT or joJAR preaap and IlAiuMCIIICS circuit, ihe filter bank 3lice3 Jp instrument 3ound jpectrua into banas :n the 3aoe way Analyser filter ioea on the jpeech 3pectrua. Each 3lice tr?n connects to /oitdge :ontroiied amp -7CA. 7CA During an absen

14、ce of signal in Analyser ilterie.g.IC5O IC55.-C63), negative peaks of trianalar *ve jn pin 1J of IC33 is kept positive -determined by 7?.3 with respect to the pin 11, disnabling 3witcnir.g gata -iC;2. When the voltage from ICc3 increases to . scae extent, it exceeds lower portion of trianiguiar wave

15、,au3ing IC33 pin 13 turns to H wnich in turn gates 1C32 :. When pc3itive going triangular wave reaches above the /ctage on pin 11, pin 1; tum3 to L and IC32 turns off. Ths signal flow rate througn IC32 aepend3 sn the width of lulse :*r:a 1C33 and pulse width is proportional to -Co; ;trcl ventage. pu

16、l3e3ating rectified 3ignal3 are smoothedwhile tr.ey are passing through the next fixter -IC39. TOCCDiiR I1CLD IC33 pin 10 IC33 pin 11 IC63 pin 7 IC33 pin 1 -rj n HUH CCNSCIIA3T FILTER This H?F allows only high-frequency cccc-.ent -n signal from tne Mic imp :o pass 30 aa to coaper.sa; fr r.igh- reque

17、r.cy range .r.oapube .: reprcciuc-.ior. : t.ie :c :aer rhu jirrj; .j : i.-npoj.jd ;f QC.Q3 lnd Q.X. *hen the KCLD jacit circuit :pen3, and 5Cm3 later, the Q2 output mcrea3*3 in -.r;-* positive-going to turn on tne gate Ql and to jnunt 175 0 input to the ground. On the other hand, a 3ignal supplied t

18、hrough D7 turns FST 3witch IC53 (pins 10-12) on, turning 1C53 (pins 3 and 9) off, disconnecting H3O7 from iiscr.argir.g path, increased discharging time constant can r.old previously charged C135 for 7-10sec. 7CICS JHARACTCR CONTROL Because resi3*or3, -R726,728, 730 connected to wiper terminals of C

19、HARACTCR CONTROL pots, are different in value; the higher the frequency, the arger the value: overall frequency response offer3 de-emphasized charac teristics . SOUNU DETECTOR During an absence of musical instruments signal,7cccder 3hut3 inadvertent 3ignal3 in under the coordination of a system. The

20、 sound detector i3 the first 3tage of the 3y3tem. IC45 (?in3 -, D51 and D52 make up a full-wave recti fier, the average output voltage is peak of the 3ignal ielivered by IC21 pir. 1, then IC45 (pins 1-3) provides adequately smcctn C output from pin 1. hen this vc.tage -at pin 4 of IC37 -exceeas volt

21、age at pin 5, pin I goe.s to negative, cutting Q29 off, removing the ground rrea pin 2 of 1C17(IC19J. Expanders are now ready to function. IC37 pin 7 al3o 3ees Sound Detectors output and deter mines pin 1s output pulse rfidth which in turn regulates H?F sigriHl flaw rare. While Synthesizer filter 7C

22、A re sponds to se-izr. 3 peer rum, H?F .CA to tne instrument 3. Scan by Manual Manor RadioFans.CN 收音机爱 好者资料库 CIRCUIT DESCRIPTION General- Sound from Musical Instrument Voice from XIC High Sound 3yr:as3 Filter Com pressor 1st Filter Amplitude Detector Sound Detector 2nd Filter -* VCA * Sxcander Holi

23、In the Vocoder, the voice signal from a Mic is frequency-analysed through a group of filters to slice up a voice signal frequency 3pectruna featuring huaar. voice. Then the spectrum is duplicated to another group of musical sound signal filters to obtain func tions equivalent to human acuth and thro

24、at and thus to simulate human voice with musical sound signals. Fundamental Vocoder functions are discribed below according to t.ie Blocsk Diagram shown above. 1. Analyzing (first) Filter and Amplitude Detectors A Mic iixput signal is resolved by a group of filters into freqen- cy band components wh

25、ich are amplitude-detected and supplied tc the VCAs of the Synthesiser Filter (second filter). Signals passing through second filters are. controlled in volume at VCA b.y the control signal coming from corresponding frequency band of tne first filter. Z. Synthesiser ,3e;or.a; liter and CAs Like the

26、first filter, aausicai 3cund signal being supplied is resolvd into frequency spectrum components. Sise a musical 3ound passing through the 3ecori group of filters is proportional to the f*st filter output amplitude, the spectrum the second filter output is analogous to trit of the vcice signal. In e

27、ther words, :he second filter output is mixture of trie input musical 3cund signal and the firs: signal output. Thus, uniform 3ound signa. spectrum would be ideal for reproduction of human voice, but it is no longer of a musi:al instrument. 3 Compander The compander is a combination 3f a compressor

28、and an excajier. The compressor reduces a a ic input signals range in amplitude and su: plies smaller out- cut signals range than inj ut signals to the first filter. On the contrary, the expan der, for a given range of amplitude input v oltages, produces a larger amplitude range o f output voltage.

29、Thus restores the ordinal volume range. i. Kigir. Frequency Voice Signjil Bypass Filter Reiionant Filter) 3mce musical sounds rarely include high frequency r.oise components such as fricative may be in V.ioe, the second filter has no spectrum to respen: to. Furthermore, such a sound, hardly relating

30、 t: musical intervals, is separated from a mic inpu signal, passes through this circuit and is re- ccmbined with the second filter outputs. 5. Musical Sound Signal Detector This circuit -obstructs tne second filter output a; long as a musical sound is not supplied to the Vocoder and tells the circui

31、ts 3 and i whether a musical scur.d signal is being fed cr net. Thi3 circ .it enables Vocoder to hold its output luring an interruption in mic signal,e.g. when a singer inspires, -he function can also be used for some special effect applications. During holding, this circuit retains spec trams and v

32、olume by holding amplitude ietectors output volt ages and expander control voltage. Tne compressor gain is minimised and the vcice gate is turned off so as to 1-ceep vcice unchanged ever. though ,Xic input singal is changing. Scan by Manual Manor OP-150 (149-150) FUSE BOARD AC CONNECTIONS 1OQV o ECG

33、HJIA473M 022-028* 0P-143A (149-143A) POWER $W. SD4-SP-00I-I OOZS 117V ECQ-UIA 473 MC 022-029 C II7V 0P-144A (149-144A) POWER SW. SD(rSPQ0/-2 QOI-ZI6 8SO,84OV O iPC4558C TL082CP LF353N TOP VIEW A OUTPUT (T)C B OUTPUT B -INPUT B +INPUT Scan by Manual Manor SVC-3 SVC-350 CIRCUIT DIAGRAM -/.I, I K9BL8 K

34、OSVUTW o WttSS I Mill noise killer Circled numbers except for those on connecting terminals are TB3T . Identical letters in the circles are lnterconneoted on the PCB. j Scan by Manual Manor uec.o, triangulnr wave c* * sou. cutofI ICD Scan by Manual Manor SVC-350 Dec. 8,1979 28N 100V 28C 117V 28D 220

35、/240V -l headphones 0 -0 POTENTIOMETER 026-163 EVH8MA361A14 lOkA solder terminal 026-161 EVH6PA361C14 TOkC 026-lb EWJEJA32OB14 10kB x 2 026-158 EVHEQA361B14 lOkB 361-K2O 029-589 EVAHHPS20B14 lOkB slider 030-461 SR19R 2.2k trimmer 030-47-1 SRiyR 100k trimmer E _ C - B - 2SA733(P) 2SC945(P) B C E 2SD2

36、34K) 2SB234(O) amp ator (Top Vie-w) 0 Vim i Irimintl ll i CAPACITOR 032-191 ECEA16N1O lOmfd 16V non-polar ECEA5ON1 lmfd SOV mm-polar ECQ31151JZ 15Opf polystyrene S G D 2SK30AIY) 2SK3OA(GR) 1OQ.117V KCQE2A473MCS 0.(M7mT GNDfl 7 13 32g 12 320 11 32CT/X1 10 32CLEAR 9 32DATA B 32PRTSCT CD4O66BE our oirr

37、 v-Q rm.n.t U i 1A4E COS/MOS Quad Bilateral Switch For Logic Syflemt AppIicMtom m Amnptx. Mttitsry, and Critic tndusirisi Equtpmwii Sped*! Fe*tvr*t: 1S-V riijitri or t ?.5-V ptrt toptf* fwitcftim ton lypiol ON fMlMMM* Iw 1S.V opatiM CJI r*tkto mmnimd to withm S II o*r IS V * hi part topwh %*! rvifi

38、Scan by Manual Manor .5. 7GCGBER JCUND 3GMP.HBSJCR JAI3 ADJUSTMENT 1. MIC :CMPR-3SSCR JAIN licH 3ine -50d3m oscilloscope LEVEL: 9 Make 3UT9 that the Red LED on the MICRCPHCNB section goe3 on and stays on in above 3et-up. Adjust TR-l for 20V?p at TP-2. 2. GUITAR COMPRSS30R GAIN Peed a 3igna-l, 1kHz,

39、sine -lOdBm into JUITAR Input jack. The Red LED on the GUITAR section shou-Ld light and stay on. Adjust 7R-2 for 2OVpp at TP-6. Vlavefora Che-eking With HARMCNECS knob turned fully clockwise, a waveform similar to the waveforms in the figure bellow 3hou2_i be seen at TP-2O. Peed a signal,IkHs,Jir.e,

40、 Jp 12 OdBm, into TP-35. Adju3t 7R-3 for 2C7=p at TP-12. 11: top vertical LqINPUT To make 3ure of the compressor function, slide /j.cb 11 lown to lowest. -he waveform has just reduced to a acme extent (,depends on knob3 traveling 3peed) is ri3ing anc ill 3top when it reaches half an amplitude of ear

41、lier. 4. 7CA TRIANGULAR VA73FCRM FR3QU3NCY Use a 10:1 probe for trace clarity. / .:i-.-ov Adjust 7R-9 for 5-us per:cd. 5. 7CA CUT-OFF 3IA3 Feed white nci3e, lVpp into GUITAR input jack. 31ide up JtURACrOR CONTROL FREQUENCY knobs 1 to 1C to the top. Adjust 7R-3 until the noise signal just disappears.

42、 Excessive turn will result in low 7CA output. MOTS If this adjustment failed noise reduction, slide io-m the knob3 individually. The signal leaking through a filter will decrease as the corresponding knob being 3iided down. Che ck tne Analyser and Synthesizer filters in that frequency cr.3ir. r or

43、malfunction. OSCILLOSCOPE O VERTICAL INPUT Place a grcund on TP-15 Plug a clank plug into SN3EMBL2 acic to open the jack circuit. a. Connect TP-16 to a ground. Adjust 7R-J. 30 that TP-17 becomes Z7 DC. b. Connect IP-19 to a ground. Adju3t 7R-= 30 that TP-13 beccme3 jI DC. 7. 3XPAN32R JAIN Feed a sig

44、nal, 1kHz, sine -3d3m ir.tc TP-15. Connect Tr-lo ar.d TP-1? to the grcur.i. a.Adjust 7R-5 for 3Vpp at TP-17. b. Ad just 7R-;-for 3V?p at TP-13. VERTICAL pO INPUT 3BD M0DULATI3C 7C0 iA7E?0RM CHEKING T = 4.-5sec vapprox.) at TP-;C ov _ -107 T = 0.2-0.2?sec at TP-31 B = 177? a: IP-33 OV T = ijus-lrus (apprcx; at r?-:5, tp-29 i | Being modulated by the composite sigr.aiiair.e and triar.glular waveforms), the waveforms at TP-2= ar.i TP-i9 3wee? 3lowly with :3gslir.g. Scan by Manual Manor