SVC-350 SERVICE NOTES

SPECIFICATIONS
ROLAND VOCODER Modal SVC-360

t->

Power 3w.tch

MACHINE

6-M4X10

SDG5P001 (01-156)

CONTROLS

3DG5P0C1-2 ('01-216)

INPUTS
MIC INPUT: 1/4 inch STANDARD
snone Jack or EIA-RS297 Connector iciOOonm. -54dBm mm.)

SDG5P5O2 (01-217)

INPUT LEVEL INDICATORS:
.ED DISPLAY 5 MIC LEVEL. Green. Red/over INSTRUMENT LEVEL. Green Red'

MIC LEVEL CONTROL

220/240V

(,-5413111 to -14dBm)

RUBBER FOOT

INSTRUMENT

OdB max.)
STANDARD Phone Jack HOOkonm,

INPUT:

GUITAR LEVEL.

Green Red/over

K-15U11-C3'

POWER CONSUMPTION: 13W

DIMENSIONS: 482(W) x 92(H) x 350(0)
QUrTAR INPUT: 1-4 inch STANDARD D*.one Jack dOOkonm. GUITAR

OUTPUTS

For GUITAR AMPLIFIER: 1/4 inch

Button

O65HO6O

MACHINE SCREW

level.)-lOdBmi75OmV)
STANDARD Phone Jack ( lOkohia)
INSTRUMENT LEVEL SELECTOR Switch (OdBm. -i5dBm, -30dBm)
MONO or STEREO OUTPUTS: 1/4 inch STANDARD Phone Jack

WEIGHT: 5 3kg

(016-009)

6-M4X12 BLK

Panel H58

(072H058)

HANDLE

108 H 00 3

Jack HLJ-OI9-01-030 (O09-046) Jack

Knot no.44

(016-044)

Knob no.77 (016-077)

Pot. 3WJEJA320B14 (026-155)

3VH6PA361C14 (026-161)

Haxa^a socket head bolt

x czim blk

HLJ-O2 46-01-030 (O09-030)

Pot. EVH8MA361A14

(026-163)

Recectacle

MIC AMP Beard

CONTROL Board

i LED Board

NC-3PP or I-3M (010-264)

AP-127

(141-127/

OP-142

(149-142)

OP-150

(149-15C)

r-Fuse

OP-143 100V

OP-144 117V

Switch SSM-02308

OP-145 220/24CV

Power transformer

(001-196)

Jack HLJ-C264-1-030

C22-028N
100V 022-028C 117V 022-028D 220/240V

(009-OP)

HLJ-024-01-030 (009-030)

Knob no.48

(016-048)

Jack HLJ-O261-O1-O3C

(009-037)

EVHHPS20B14

Switch

(029-589)

SSM-02308 (001-196

Jack HLJ-O264-O1-C2C

Terminal TT501D-1 (042-032)

(009-040)

Knob no.77 (016-077) rot. EVEEQA361314 (O26-158)

TLR-124

(019-028)

1Knob no.44 (016-044)

Pot. 3Wo"EJA320B14

FILTER Board

Ground

terminal

TLG-124

(019-029)

(026-155)

FL-19D (14--C1C)D)

(145-019) 100. ll'V

TT-9-4 (042-041)

Printed in Japan
Scan by Manual Manor http://www.markglinsky.com/ManualManor.html

Dec. 8,1979

ANALYZER

FILTERS

SYNTHESIZER FILTERS

PEAK METEC7&R

IC5O.55

/CA M ilL

EXPANDER -CONT

INSTR'

IC37 IC44

TRIAN6UU*

PETCCBR

8f-3 Circuit

K 2? (B0) I

AIIIMO AUDIO kJ

DIRECT 3IG.

TC2K9 8BJ

AU&IO

DIRECT

"ON"

L.rt.M

I L.W.H

A (A-B)

Q32-O36

IC26.Q44

'0 PHONES

ENSEMBLE

ON, OFF

SVC-350 BLOCK DIAGRAM

-Deiail-

uec. 8,1979

J "/:.rTHE JIZEli ? IL :2h

TOCCDiiR I1CLD

CCMPR3USCR
Trie Jyr.th^ji'.r ticai to tnose of

f-itor the

^f oar.'i?-^
filr-jr,.ier.by tne o.^n-

'jirrj;;

: i.-npoj.jd

;f QC.Q3 'lnd Q.X.

Analyzer 3ection,iJfed

After ampi fled

by 14-54d3
through Mic Head Amp or. Ar-127,

KCLD jacit circuit

mcrea3*3 in -.r;-*

:pen3,

and 5Cm3 later,

to turn

the Q2 output

on tne gate Ql

Mic 3ignal ijoea

proportional to

i,pin3 5-7)

whoje gain

from Q5

i3 reversely

emitter.

ii -oming

througn either IllSTRUMENT or i'he

joJAR preaap

positive-going

IlAiuMCIIICS circuit,

3ound ioea jpectrua into on the

filter bank 3lice3 Jp

:n the 3aoe

instrument

control current

to jnunt

the ground. turns
On the other hand, IC53 (pins
way Analyser filter tr?n connects to
The aic 3i,sr.ai by IC3 (pir.3
coming from IC2 pin 7 Dl and D2,
La full-wave rectified detected (pir.3 by IC3 ani

a 3ignal

supplied

through D7

FST 3witch

jpeech 3pectrua.

Each 3lice

peak-voltage

10-12)
turning 1C53 (pins 3 and 9)

disconnecting

1-3;,D*,

jncothed

to DC voltage

by IC5

/oit'dge :ontroiied amp

from iiscr.argir.g path,

can r.old previously
increased discharging time
charged C135 for 7-10sec.

7-1 converted by IC4

pins 6 and 7 As

(.pins 1-3),Q5

Connected acros3 IC4'3

is IC1 3A6CJ.

constant
in parailed with feedback resistors increases, Q5 output current

the mic si-gnai

increases,that

causes 3A662 IC4

conductance

increase,

lowering the gain
During an absence of signal
in Analyser 'ilterie.g.IC5O

(pins 5-7;

to retain either half peak output

from $oing

IC55.-C63),
negative peaks of trian^alar

jn pin 1J

7CICS JHARACTCR CONTROL

above 10V (2OVpp).

In thi3 7oc oder,

the Mic

IC33 is kept positive

there are

-determined by 7?.3 with respect

two other compressors

similar to

pin 11,

disnabling 3witcnir.g gata -iC;2.

Because resi3*or3,

-R726,728, 730

connected

compressor

configuration:

Guitar preamp

the voltage

increases

to. scae extent, it

IC33 pin
wiper terminals of CHARACTCR CONTROL pots,
in value; overall the higher the frequency,

are different

synthesizer filler output

channe-.

exceeds lower portion

trianiguiar wave,au3ing

the ^arger the value:

"H"

turn gates

:. When

/ctage on

pc3itive

frequency response
offer3 de-emphasized charac

triangular

reaches

teristics.

SXPAIJDSR

pin 1; rate

"L"

IC32 sn

Ths signal

flow 1C33

SOUNU DETECTOR

througn

aepend3

the width of lulse :*r:a

output -voltage

received

and pulse width is

proportional

;;trcl ventage.

tr.ey are

3x?ander3

varies

IC17-20,

322 and

current from 322

pul3e3ating rectified

3ignal3 are

fixter

smoothedwhile

-IC39.

in the

same direction a3

the Compressor,

passing through the next

During an absence of musical
3hut3 inadvertent The 3ignal3 in
instrument's signal,7cccder
under the the coordination of first 3tage of a the

thi3 fashion,

3igr.al flew rate through IC13 (IC2G/
to the control current; the more

reciy proportional

current

system.

3y3tem.

sound detector i3

flows,

the moire signal

through

IC33 IC33

pin 10 IC45 pin 11 (?in3 ~-~}, D51 and D52 make up a full-wave recti
voltage is peak of the 3ignal

ANALYZER FILTSR

7 IC33 pin 1

the average

output
ielivered by IC21 pir. 1,
adequately smcctn ^C output

then IC45

(pins 1-3) provides

from pin 1.

Ten 3?Fs witri a nign Q consisting of ICs
IC55; The covers most of the audio spectrum 3ignal from

5-7) and

IC<?G and

signal. through

hen this vc.tage at pin 5, pin I goe.s

pin 4 of IC37 - exceeas

voltage removing

- 3peech

to negative, cutting Q29 off,

to the

pre-emphasized

HUH CCNSCIIA3T FILTER

the ground

ready to

rrea pin 2

1C17(IC19J.

Expanders are now

IC5l?in3

filter bank which slices up

function.

3pectrum.

3lice goes

to a iiode(e.g.

is fed

where its

This H?F allows

from tne Mic imp
only high-frequency cccc'-.ent
:o pass 30 aa to coaper.sa; f^r : t.ie

-n signal

r.igh :c :aer
IC37 pin 7 al3o 3ees Sound Detector's
mines pin 1's output pulse

output and deter

peak is letected,

3moothed and

the 7CA in the next

a control voltage

slice.
rfidth which in turn regulates
filter -Synthesiser filter.

is proportional to *.he

"requer.cy

.r.oapub^e

.:' reprcciuc-.ior.

H?F sigriHl flaw rare.

While Synthesizer filter 7CA

jtrer-ght

sponds

to s^e-izr. 3 peer rum,

.'CA to tne

instrument' 3.

CIRCUIT DESCRIPTION

General-

Synthesiser
,'3e;or.a; liter and "CAs
Kigir. Frequency Voice Filter

Signjil Bypass

\Reiionant Filter)

the first

filter,

aausicai 3cund signal

frequency

being supplied

Sound from Musical Instrument

is resolvd into

r.oise V.ioe,

musical

sounds rarely

such as

include

be to in

spectrum components.

a musical

components the second

"fricative"

passing through the 3ecori group of filters

filter has no spectrum

respen:

High Sound

Sound Detector

filter

Furthermore,

intervals,

such a sound,

is separated

hardly relating t:

from a mic inpu"

amplitude,

output is

spectrum the second

to trit of

from XIC

3yr:as3 Filter

analogous

the vcice

signal,

ccmbined

passes

with the

through this

second

circuit and

signal.

pressor
In ether words, :he second filter is mixture of trie input musical output.

Filter

filter outputs.

Amplitude Detector

2nd Filter

-* VCA *

Sxcander

3cund signal and

the firs: signal
uniform 3ound signa. spectrum would be but
5. Musical Sound Signal Detector
ideal for reproduction of human voice,
it is no longer of a musi:al instrument.

circuit

-obstructs
long as a musical Vocoder and tells

sound the

is not

circuits 3 and i whether

In the Vocoder,
the voice signal from a Mic is frequency-analysed

Compander

musical scur.d signal

is being fed cr net.

a group of filters to
slice up a voice signal frequency
Then the spectrum is duplicated The compander
3pectruna featuring huaar. voice.

combination

excajier.
to another group of musical sound signal filters to obtain func
tions equivalent to human acuth and throat and thus to simulate
human voice with musical sound signals.
The compressor reduces a a ic input signals
range in amplitude and su: plies smaller outthan inj ut signals' to the
Thi3 circ.it enables Vocoder to hold its output
Fundamental Vocoder functions are discribed below according to
t.ie Blocsk Diagram shown above.
cut signals range first filter.
luring an interruption in mic signal,e.g.

when a

singer inspires,

some special

-he function can also be used for
On the contrary, the expan der, for a given
range of amplitude input v oltages, produces

effect applications.

During holding,
this circuit retains spec trams and

ietectors output volt

1. Analyzing (first) Filter and Amplitude Detectors
a larger amplitude range o f output voltage.
volume by holding amplitude
Thus restores the ordinal

volume range.

A Mic iixput signal is resolved by a group of filters into freqency band the components which are amplitude-detected and supplied tc VCAs of the Synthesiser Filter (second filter).
ages and expander control voltage.
Tne compressor gain is minimised and the vcice gate
is turned off so as to 1-ceep vcice
though ,Xic input singal is

unchanged

Signals

band of

passing through second filters are. controlled in volume

tne first filter.

changing.
at VCA b.y the control signal coming from corresponding frequency

OP-150 (149-150)

FUSE BOARD

AC CONNECTIONS

3lee'- nut r.o.lr -

Connector

Jxl2im (120-01=)

(G53-3S3)

PG3 O52H195

022-028*

LED TLR-124 red

Polycarbonate

collar

]ECGHJIA473M\

0P-143A

AP-127 (141-127)

(Etch mask 052491)

(149-143A)

POWER $W. SD4-SP-00I-I

022-029 C

MIC LBTfiL

2SC945-P 2SA733-P

Electrolytic

HLJO19O-O1-03O

3T/H6?A361C14

(026-141)

(009-046)

Maylar 507 Z

Ceramic 50V K

ECQ-UIA 473 MC

Resistor -J-w

0P-144A

OP-142 (149-142) View from foil side

POWER SW. SD(rSP~Q0/-2

QOI-ZI6

(149-144A)

3ALANCI1

3VAHHPS20B14

(Etch mask 052492)

8SO,84OV

T/Rlo 13< 12

022-02M D

&CQ2A 47JMQ3.

022-0UD

SW. $D<k- SP-SQ2

ooi-2\n

OP-145A

(149-145AJ

(Etch mask 052H185A)

HARMONICS

701'JMI

I BWJ-3JA32OB14

BVH-BQA(026-153)
PL-19D (2 20/2407 V3RSIGN): WITH FUSES

FL-19 (145-019) (pcb os249O)

SYNTHESIZER FILTER

O 5O45-1CA

ANALYZER FILTER

s * 8dsado flogs

5O45-O6A

ENSEMBLE (DELAY CIRCUIT

5C45-CMA

PARTS LIST

022-028N

072H058 Panel H58 front

Power transformer no,28N

Power transformer no.28C

022-028C

1O8H003

111-037

Cover (case) H60

Handle H3

Rubber foot K-15

022-028D

022-122
Power transformer no.28D 22O/24OV
Output transformer MT-31 headphones

O61HO?2

Chossis HQ2

SEMICONDUCTOR

016-044
Knob no.44 MIC LEVEL.VOLUME

016-077

016-048

Knob no.77 rotary samall

Knob no.48 slider

016-009

t'10-264

Button no.9 blk

power switch
Receptacle NC-3FP or D-3M

009-037

009-040 nm-0?0

Jack HLJ-O261-O1-O3O

Jack HLJ-O264-O1-O2O stereo Jack HLJ-O264-O1-O3O

0O9-046

001-156
Jack HLJ-O19O-O1-O3O headphones
Switch S1XJ5F001 power 100V

'01-r?l6

001-217

001-195

Switch SDG5POO1-216 power

Switch SSMO23O8 slide

Switch SDG5P 502 power 22O/24OV

145-019

145-019D

FL-19 (PCB 052-490)

FL-19D with fuses

100/117V

22O/24OV

141-127

149-142

149-150

0P-150

(PCB 052-491)

(PCB 052-492)

(PCB O52H195)

control

Fuse PCB (PCB O52H185A)

149-143A OP-143A 100V

149-144A

OF-144A

MPC177C

149-145A

FUSE HOLDER

008-026

Fuse SGA 1A prim,

008-0 2r^
Fuse CEE T500mA prim.sec. 22O/24OV

U U LJ

MN3010

(Top Viw)

012-003

Clip TF-758

DUAL OP AMP

;iPC4558C

TL082CP

TOP VIEW

LF353N

A OUTPUT (T)C

B OUTPUT B -INPUT B +INPUT

SVC-350

CIRCUIT DIAGRAM

KOSVUTW

noise killer
Circled numbers except for those on connecting terminals are TB3T
". Identical letters in the circles are lnterconneoted on the PCB.

uec.o,

triangulnr wave

sou. cutofI

"c*

POTENTIOMETER

28D 220/240V

-^l headphones

026-163

026-161

026-l^b

EVH8MA361A14 lOkA

EVH6PA361C14 TOkC

solder terminal

2SA733(P) 2SC945(P)

EWJEJA32OB14 10kB x

026-158

EVHEQA361B14 lOkB

361-K2O

029-589

030-461

EVAHHPS20B14 lOkB slider

SR19R 2.2k

SRiyR 100k

trimmer

030-47-1

2SD234K))

2SB234(O)

CAPACITOR

032-191

ECEA16N1O lOmfd 16V non-polar ECEA5ON1 lmfd SOV mm-polar
ECQ31151JZ 15Opf polystyrene

1OQ.117V

2SK30AIY)

2SK3OA(GR)

KCQE2A473MCS 0.(M7mT<i polypropylene
032-228 CB15B1V4H7 4.7mfd ?SV k tantalum

2SB605

1. KmiHer

MISCELLANEOUS

2. Collector

064-265

Holder no.265 PCE retainer

right angle

DLCBS-6N

3. Rise

3y6mm long

064-200 120-015

PCB hulder(fastener/spacer)
Sleeve nut no.35 3x12mm (spacer or stand-off)

073-037

042-032
Polycarbonate collar "5x6x18mm

Terminal TTS01D-1 2p

042-041

Terminal TT-9-4 ground

Heat sink no.l

048-001

123-013 065-268
Hexagon socket head bolt 4x8mm Cover no.268 dust cover,slider
DUAL *0" TYPE FLIP FLOP

TC4013P

065-261
Cover no.261 dust cover,slide sw.

13 32g

(Top Vie-w)

ICLOCKC 3

12 320

11 32CT/X1

Quad Comparator

1CLEARC

1DATAC 5

1 PRESET C f>

GNDfl 7

10 32CLEAR

9 32DATA

. AN6912

Connection Diagram

(Top View)

B 32PRTSCT

CD4O66BE

COS/MOS Quad Bilateral Switch
Mttitsry, and Critic^ tndusirisi Equtpmwii

Sped*! Fe*tvr*t:

For Logic Syflemt AppIicMtom m Amnptx.

0 Vim i Irimintl ll i

1S-V riijitri or t ?.5-V ptrt toptf* fwitcftim
ton lypiol ON fMlMMM* Iw 1S.V op^atiM

rm.n.t U i

CJI r*tkt>o mmnimd to withm S II o*r IS V
* hi part topwh %*! rvifi

7GCGBER

3GMP.HBSJCR

ADJUSTMENT

Place a grcund on TP-15
Peed a signal,IkHs,Jir.e, J[p 12

OdBm, into TP-35.

for 2C7=p

Plug a

clank plug

^acic to

open the

SN3EMBL2

circuit.

Adju3t 7R-3

1. MIC

:CMPR-3SSCR

at TP-12.

""vertical

Connect

a ground.

Adjust 7R-J. 30

that TP-17

LqINPUT

11": top

becomes
b. Connect Adju3t beccme3

Z7 DC.

IP-19 7R-= 30 to a ground. that TP-13

-50d3m

oscilloscope
To make 3ure of the compressor function,

lowest. -he waveform has

slide /j.cb "11" lown to

a acme extent

just reduced to

j'I DC.

LEVEL:
(,depends on knob'3 traveling 3peed)
it reaches half an amplitude
is ri3ing anc ''ill 3top when

of earlier.

7. 3XPAN32R JAIN 4. 7CA TRIANGULAR VA73FCRM FR3QU3NCY
Feed a signal, 1kHz, sine
Make 3UT9 th~at the Red LED on the MICRCPHCNB
section goe3 on and stays on in above 3et-up.

-3d3m ir.tc TP-15.

Use a 10:1

Adjust TR-l

for 20V?p at TP-2.

ar.d TP-1?

grcur.i.

clarity.

a.Adjust
for 3Vpp at TP-17. for 3V?p at TP-13.
/.:i-.-2. GUITAR COMPRSS30R GAIN

VERTICAL pO INPUT

b. Ad just 7R-;-

Peed a 3igna-l,

into JUITAR

sine -lOdBm

Adjust 7R-9 for 5-us per:cd.
3BD M0DULATI3C 7C0 iA7E?0RM CHEKING

The Red LED

on the GUITAR
stay on. 5. 7CA CUT-OFF 3IA3
section shou-Ld light and

Adjust 7R-2

for 2OVpp at TP-6.

T = 4.-5sec

Feed white nci3e,

input jack.

vapprox.)

into GUITAR

OSCILLOSCOPE

at TP-;C

_ -107
Vlavefora Che-eking With HARMCNECS knob turned fully clockwise, a waveform similar to the waveforms
bellow 3hou2_i be seen at TP-2O.
31ide up JtURACrOR CONTROL FREQUENCY
knobs "1" to "1C" to the top.

in the figure

Adjust 7R-3 until the noise disappears. Excessive

signal

0.2-0.2?sec

at TP-31

B = 177?? a: IP-33

turn will

result

VERTICAL INPUT

in low 7CA output. MOTS

ijus-lrus

(apprcx;

<><

at r?-:5,
If this adjustment failed noise reduction, slide

individually. The signal

io-m the knob3
leaking through a filter will decrease
Being modulated by the composite sigr.aiiair.e and triar.glular
as the corresponding knob being 3iided down.

and Synthesizer filters

Che ck tne Analyser

waveforms),

the waveforms at TP-2= ar.i TP-i9 3wee? 3lowly
in that frequency cr.3ir. r or malfunction.

with :3gslir.g.