siFl-3cI3

()ploNEER.

MODEL SR.3O3 COMES IN THREE VERSIONS DTSTTNGUISHED AS FOLLOWS:

Type Voltagê Remarks

KU 120V on ly U.S.A. model

s | 1OV, 12OV, 22OV and 240V (Switchabtel General exDort model

S/G 11OV, 12OV, 22OV and 240V lswitchabte) U.S. Military model

CONTENTS1 .

2.

3.

4.

5 .

6.

7.

8.

9.

10 .

SPECIFICATIONS

FRONT PANEL FACIL IT IES .

BEAR PANEL FACIL IT IES

BLOCK DIAGRAM

CIRCUIT DESCRIPT IONS. . .

D I S A S S E M B L Y . . . . .

PARTS LOCATION . .

ADJUSTMENT. . . .

EXPLODED V IEW .

SCHEMATIC DIAGRAM, P.C. BOARDPATTERNS AND PARTS LIST

10.1 Miscellanea

10.2 Schematic Diagram

10.3 P.C. Boards Connection Diagram1O.4 Parts List of p.C. Board Assemblies. .

t l . P A C K | N G . . . .

are the same. the variations in safetyvariations in power supply and circuit

servicing of the other types please refer

Although the basic features of KU, S and S/G typesstandards in different countries has also necessitatedcomponent specif ications.This service manual is applicable to the KU type. Forto the additional senrice manual (see page lg).

2

34

4

5

8

I

1 0

1 0

1 2

1 3

1 5

1 7

1 8

8'|

20r6

I npu t (Sens i t i v i t y / lmpedance ) . . . . t 50mV/50k0(at I kHz, DEPTH volume: 0)

F reguency Response . . . . : . 5Hz toT0kHz t l dB(at DEPTH volume: 0)

Total Harmonic Distortion . . . . Less than 0.0520(a t 1kHz , 1V , DEPTH vo lume : 0 )

Maximum lnput Level (;; ikH;, r v, oEpi' ;"j;,,.';,

'oT

signal to Noise Ratio ' i.r'rr, DEpiH ;;;r:lii

Reverberar ion Time . . . 0 to 3 sec (at EFFECT 1,400H2)25msec to 1O0msec (ar E FFECT 2, 400H2)

Outpur (Levet/ lmpedance) . 150mV/lke

Misceilaneous (at l kHz' DEPTH volume; 0)

PowerRequiremenrs . . .110Vl12OVl22OVl24OV

powerconsumption . . . . .(:i:t:i*'.0.,.t}:lr!r;Dimens ions . . . . . 420 (W) x99 (H) x336 (D) mm

16_elt6(w) x 3_7lB(H) x 13_t la@l inWeight (without package)

Furnished PartsC o n n e c t i o n c o r d w i t h p i n p l u g s

. . . . . 2Operating instructions

l

NOTESpecifications dnd the desig.n subject to possible modifica-tion without notice due to improuemerir.---'-''

1. SPEC|FtCAil|ONSSemiconductorslCsFETTransisitorsDiodes

Reverberation Amplifier Section

siFr-3cl3

2. FRONT PANEL FACILITIES

e PowER swlTcHPower is suppl ied to the model SR-303 when th is swi tch is

depressed. The power indicator comes on as soon as thepower is suppl ied.

@ POWER TNDICATORThis comes on as soon as the SR-303's power switch isset to ON to indicate that power is being suppl ied.

@) REVERBERATTON EFFECT TNDICATORThis displays the reverberation effect graphically. Whenthe reverberation time is increased (the reverb time con-trol is rotated clockwise), the winking intervals of thelight are lengthened. Conversely, when this time is re-

duced (the reverb time control is rotated counterclock-wise), these intervals are cut short. Also, the l ighting areaincreases in proportion to the size of the reverberationcomponents. This area is increased as the depth control is

rotated clockwise. The reverb time and depth controls are

set to the preferred position as you check out the re-

verberation, but if the reverberation indicator's circle of

l ight remains on the display, it means that the reverbera-

tion components are excessive (too much of an echo). Use

this as a base for adiustments.

@ REVTRBERATTON ON SWITCHDepress this switch to produce a reverberation effect with

the s ignals fed f rom the REVERBERATION INPUT iacks.The reverberat ion ef fect ind icator wi l l come on, andsignals featur ing a reverberat ion ef fect only wi l l be fed outf rom the model SR-303's OUTPUT iacks.

@ REVERBERATION ON.RECORDINGswrTcH

Depress this switch when recording a program sourcewhose signals feature a reverberation effect onto a tape in

a deck connected to the model SR-303's TAPE iacks. This

wi l l a l low s ignals wi th the reverberat ing sound to be made

avai lable f rom both the SR-303's OUTPUT iacks and theTAPE REC iacks.

G) REVERBERATTON OFF SWITCHDepress this switch to cut off the reverberation effect.This wi l l a l low s ignals wi thout a reverberat ing sound to bemade available from both the SR-303's OUTPUT iacksand the TAPE PLAY iacks.

NOTE:The reuerberation on switch, the reuerberation on-recording switch and the reuerberation off switch are allcoupled. When you depress one switch, mahe sure thatall the others are released. Do not depress more than oneswitch at a time.

o rnpe MoNrroR lNDlcAToRThis comes on when the tape monitor switch is depressed.

@ TApe MoNrToR swrTcHDepress this switch to monitor the sound on the tape asit is being recorded or when playing back a tape using atape deck connected to the SR-303's TAPE lacks. (Thetape monitor indicator comes on.)

o REVERB T|ME CONTROLThis is used to adjust the delay time.The reverberation effect becomes more pronounced whenthis control is rotated clockwise as you listen to the re-oroduced sound. L is ten to the sound and then set th iscontrol for the optimum effect. Selection can be madebetween two types of reverberation with the model

SR-303 by pushing the reverb t ime contro l or pul l ing i tout. Pushing the control gives EFFECT 1 (longer re-verberat ion t ime) and pul l ing i t out g ives EFFECT 2 (one

reverberation component).

@D DEPTH CONTROLThis is used to adjust the depth of the reverberat ion.When i t is set to the '0 'posi t ion, only the or ig inal soundwill be heard. The reverberation component increasesas this control is rotated clockwise. Listen to the sound asit reverberates and adiust this control to the optimumoosi t ion.

If

oploN€a

Delay Signal Mixing Circui tSee Fig.5-3 for an outline of the delay signal

mixing circuit.Buffer Amplifier

The left and right channel input signals areapplied to the buffer amplifier stage (SEPP circuitconsisting of PNP and NPN transistors). Theoutput simal is applied to the mixing amplifierand center component detector stages.Mixing Amplifier I

This stage where the left and right channelsignals are mixed, consists of an operational ampli-fier (IC-lz) with voltage negative feedback appliedto the input. The So switch (EFFECT 1/EFFECT2) is used to select echo and single delay modes.In the EFFECT 1 position, delayed signals arereapplied to the mixing amplifier input, therebyachieving an echo effect (see Fig. 5-28).LPF (Low-pass filter)

These LPF stages are active low-pass filters with-36d8/oct. cut-off slopes. The LPF in the BBDinput stage eliminates beating between the signaland clock pulses, while the LPF in the BBD outputstage is used to remove the clock pulses.

HPF (High-pass filter)The 2 HPF stages (in the BBD input and output

stages) are used to attenuate the low frequencycomponents which would otherwise Iead to arather undesirable reverberation effect.BBD (Bucket Brigade Device)

This 2048-stage MOS type BBD IC (MN3008)has been designed to vary the delay time between25.6 and 102.4ms by adjustments of the clockfrequency (10kHz to 4OkHz range).Clock Generator

The clock generator employs a hex inverterCMOS logic IC (pPD4069C) which features anastable multivibrator formed by 2 inverters. The2-phase clock pulse signal consists of the outputobtained from 1 inverter plus the output obtainedfrom both inverters.

By varying the gate voltage of the FET em-ployed as a variable resistance element in theoscillator time constant circuit, the change in theintemal resistance will alter the oscillator fre-quency. The FET gate voltage, and consequentlythe delay time, is changed by adjusting theREVERB TIME control located on the front panel.

MIXING AMP.2

M I X I N G A M P . 3

M I X I N G A M P . I

Fig. 5-3 Delay Signal Mix ing Circui t

5. CIRCUIT DESCRIPTIONSThe SR-303 Reverberation Amplifier is an

electronic delayed signal mixing amplifier featuringthe recently developed Bucket Brigade Device(BBD).

To achieve a reverbetation effect in the repro-duction of sound, the original program source ismixed with a delayed component of the sameprogram source. Conventional methods of delayingaudio signals have involved the use of springs,metallic plates, and other means of transmittingmechanical vibrations, plus magnetic tapes anddiscs. In comparison to these methods, the elec'tronic BBD is small and compact, resistant to theeffects of external vibrations, and permits freeadjustment of delay time.

Operating Principles of the BBDThe BBD is a kind of charge-transfer device

made with a large number of capacitors andtransistors arranged altemately on a semiconductorbase (see Fig.5-1). Each pair of adjacent capacitorand transistor (called a stage) is driven by a 2-phaseclock pulse signal (180" phase difference), resultingin the input signal being relayed from stage to stagein "bucket brigade" fashion down to the outputcapacitor. Delay time wilI therefore depend on thenumber of capacitoritransistor pairs (stages) whichin tum may be adjusted by varying the frequencyof the clock pulses.

s|Fl-3Cl3

into the delay circuit (see Fig.5-28). This requiresthe REVERB TIME control to be pushed backinto the EFFECT 1 position. In the circuit diagramouUined in Fig.5-3, 56 corresponds to theEFFECT 1/EFFECT 2 switch.

( A ) S I N G L E D E L A Y

O R I G I N A L S I G N A L

( B ) E C H OO R I G I N A L S I G N A L

Fig. 5-2 Delay Pattern

Dynamic DelayThe dynamic delay function varies the degree

of mixing depending on the relative level of thecentrally localized components when adding thedelay signal to the original signal. If the level ofthese components is high, the level of the delayedsignal will be increased. The delayed componentwill thus be increased at higher volume levelsduring vocalist and solo instrumental performance,thereby attaining a more natural reverberationeffect. At low volume levels, the delayed signalcomponents are suppressed. The level of noisegenerated in the BBD is also decreased, resultingin an improved S-N ratio.

Furthermore, since the reverberation effectappears to be obtained only with the centrallylocalized components, sufficient reverberation mayalso be obtained by delaying the mixed left andright channels and applying the result to bothchannels.

POLEc P l

c P 2

I N

c P l

c P 2

Fig . 5 -1 Const i tu t ion o f BBD

Features of the SR-3O3 Reverberation Amplifier

Single Delay and EchoÀ single delay is obtained by adding the delay

single once only (see Fig' 5-2A). For this opera-

tion, the front panel REVERB TIME control is

pulled out into the EFFECT 2 position'

The echo effect is obtained by applying the

signal which has already been delayed once back

Si ozP

e

3. REAR PANEL FACILITIES

o REVERBERATION INPUT f ACKS

Connect these jacks to the TAPE REC lacks on the stereo

amplif ier or to the PREAMP OUT (OUTPUT) jacks on the

preamplif ier.

@ REVERBERATION OUTPUT f ACKS

Connect these iacks to the TAPE PLAY iacks on the

stereo ampl i f ier or to the POWER AMP lN ( INPUT) jacks

on the power amPlif ier.

€) TAPE REc IACKSConnect these to the INPUT (REC) iacks on the tape

deck.

o TAPE PLAY TACKSConnect these to the OUTPUT (PLAY) iacks on the tape

deck.

€) ATTENUATOR SWITCHThis is used to attenuate the model SR-303's input signals'

It is normally set to OdB (released position). When using

the model to reverberate the sound of a program source

having an extremely wide dynamic range' such as a l ive

recording, or when the sound appears to be distorted

with the switch set at the OdB position, depress this

switch and set it to the -6dB position'

NOTE:The maximum rated input of the model SR'303 is 2V'When it is being used between the PREAMP OUT iachsof the preamplifier and the POWER AMP IN iacks of thepower amplifier, set this suitch befotehand to -6dB ifthe output leuel of the preamplifier will exceed 2V'

@ nc ourLETThis is an auxil iary power outlet. Connect the power plug

of your tape deck or other stereo hi'fi component to this

outlet. lt is not coupled with the power switch on the

model SR-303 (UNSWITCHED). The maximum power

capacity is 1 00W and so do not connect electrical ap'

pliances with a power capacity exceeding this value.4. BLOCK DIAGRAM

@ s

swrTcHS:

st ATTEilUATOF

odB/ - 6 dE

52 TAPÊ MONITOR

æ F l O N

. s t s 3 ).-oore-| on REcdorNG (s 4 r

L O F F ( 5 5 , f t L E Â S € )

E F F E C I I / E F F E C I ?

IAP€

REC

TAË

REC

Serial number Plate

CENTEF COMPMT ËTECTOR

INOICATOR

VCA (Voltage Controlled Amplifier)The VCA component is an amplifier capable of

controlling gain by voltage changes, and is em-ployed in the dynamic delay function, This gaincontrol is achieved by using a control voltage fromthe center component detector to vary the com-mon emitter current of the differential amplifier.

Mixing CircuitAfter first adjusting the level of the VCA output

signal, this signal is mixed with the left and rightchannel original signal in mixing amplifiers 2 and3. The delay signal applied to the left channel ispassed through an inverter where the phase is in-verted (in respect to the right channel delay signal).This step eliminates the localization of the delaysignal, resulting in a much more natural reverbera-tion effect.Center Component Detector

This circuit detects the centrally localized com-ponents of the stereo signal, and applies a resultantcontrol voltage to the VCA for the dynamic delayoperation. The constitution of this circuit is shownin Fig.5-4.

R.E. l . Dr iver C i rcu i tThe SR-303 is equipped with a Reverberation

Effect Indicator used to display the reverberationstatus obtained, and this R.E.I. driver circuit is

employed to drive the necessary illumination lamps(see Fig.5-6).

The dynamic range of the input signal (delay

signal) is first compressed and rectified, the result-ant signal then passed through 3 lamp drivertransistors, each of a different operational point.

Hence, each lamp will light up independently,depending on the level of the delay signal.

L R L _ C H

I N - P H A S E O N L Y

siFl-3C,3

R - c H L RONLY OPPOSITE

ILLUMINATION

I'JÀMPS'

Fig. 5-4 Center Component Detector

Fig. 5-5 Wave Forms in Center Component Detector

o Fig. 5-6 R.E. l . Dr iv ing c i rcu i t

8. ADJUSTMENTS1. Set the ATTENUATOR switch to OdB.2. Press the REVERBERATION ON switch (i.e.

switch on).3. Check that the TAPE MONITOR switch is

OFF.4. Pull the REVERB TIME control out into the

EFFECT 2 position.5. Turn the REVERB TIME control until the fre-

quency measured at the TP, terminal reads2OkHz.

6. Connect the oscilloscope to the TP, terminal.7. Apply a OOHz,150mV sigrral to the input ter-

minals.8. Then adjust VR3 so that the waveform shown

in the oscilloscope is symmehical the horizon-tal a:ris.

9. EXPLODED VIEW

Parts List

Key No. Part No. Description

NO?ES;o Parts without part number cannot be supplied.c The $' marh found on some component parts indicates the importance of the

safety factor of the part. Therefore, when replacing, be sure to use jarts of identicatdesignation.

Key No. Part No. Description

1 .2.3.4.5.

6.7.8.9.

1 0 .

A E B . 1 5 1ABA-228ANE-246AAD-178

AAD- l79ANB.715AAB.2O1AAD-01 5

1 1 .12. A8A-O4813. AEC-35114. ABA-O7115. AWX-164

1 6 .17. ABA-O4918. A8A-0651 9 .20.

GWX.3O3GWS-185GWX-304

capScrew 3x6Top coverKnob (POWER)Extension bar

Knob (REVEBB, MONITOB)Front panelKnob (TlME, DEPTH)Knob (ATTENUATORI

Bottom plateScrew 3x6FootScrew 4x 1 6Lamp assembly

RE I assemblyScrew 3x8Screw 3x6Side frameWire saddle

LED assembly 1Switch assemblyLED assembly 2HolderSub.panel

26. A8A-069Azt. ATT-sss

28. ABAO5029.

Ago. RD%PSF 2R2J

31 .32. GWM-13333. M45-08634. 871-OO435.

A se. AKP-oo2437. ADG-023

38. AEC-32739.40. ABA-003

41 . ABA-1 1542. ABA-08243.

Screw 4x8Power transformerScrew 3x10Terminal strip 2-PCarbon f i lm resistor

Transformer baseReverberation assemblyWasher M9Nut M9Socket fitter

AC socket (AC OUTLET)AC power cordStrain re l iefRear panel

Screw 3x10

Special screwScrew 3x1O

Caut ion label

21 .22.23.24.25.

o

stFl-3cl3

7. PARTS LOCATIONFront Panel View

Front panelANB.715

Knob (POWER)AAD-178

Front View with Panel Removed

LED (POWEAEL-325

Push switch(POWER}ASG-21 5

Top View

fi Power transformerAATr-595

, r Carbon f i lm reslstor/ ' ! \ tz .zay"wl-RD%PSF

2R2J

o The A marh found on some component parts indicates

the iiportance of the safety factor of the part There'

fore, when replacing, be sure to use parts of identical

designatton.

Top coverANE.246

Knob (REVERB, MONITOR)AAD-179

Knob (T lME, DEPTH)AAB-201

LEO (MONITOR}AEL.324

t l

3-oanq push switch(R -EVERBERATION}t 'nËv"e-nïËÉÀirorut (REVERBTIME)Àsè-zrz Acv'sog

i'Ë

].:lt

Push switch(ATTENUATOR}ASG-1 50

Reverberation assemblYGWM.133

Push switch(TAPE MONITORIASG-214

Lâmp assemblyAWX-164

Switch assemblYGWS-185

Rear Panel View

Term ina l (REVERB, TAPE)

AKB.063

, A AC socketA tac ourLET)

AKP-OO2

Strain re l iefAEC-327

KNOb (ATTENUATOR)AAD-01 5

o. A AC Power coroA loc-ozs

6. DISASSEMBLY

Bottom PlateRemove the ten screws to detach

the bottom plate.

Front PanelRemove the two knobs by pull ing.

Remove the five screws from the topand bottom edge.

J

siFr-3cl3

Exterior Components

s_ft)

Itl 2

t 3

Interior Components

'fr{21 3l{

33 \12

10. SGHEMATIC DIAGRAM, P.C. BOARD PATTERNSAND PARTS LIST

NOTES:c When ordering resistors, first conuert resistance ualues into code form as shown in

the following examplesEx 1 When there are 2 effectiue digits (any digit apart from 0), such as 560 ohm

and 47h ohm ( to lerance is shown by J = 5o/o, and K = 10o/ù.5 6 O a 5 6 x 1 0 t 5 6 1 . . R D % P S 5 6 m . /4 7 h a 4 7 x 1 0 3 4 7 3 . . . . R D L / q P S @ A A J

Ex 2 When there are 3 effectiue digits (such as in high precision metal film resis-tors).5 62ha 562 x 10 ' 562L . RNY4SR EE]At r^F '

. The A marh found on some component parts indicates the importance of thesafety factor of the part. Therefore, when replacing, be sure to use parts ofide nt ical d esignation.

10.1 MISCELLANEAMiscellaneous Parts

Part No. Symbol & Descr ipt ion

0.5ai a

0 R 5 . . . . R N 2 H C I B t r K0 1 o . . . . . R S / P O m O K

A nrr-sgsA nozpsr znz.r

A nrp-oozAnoc-ozg

GWM-133GWS-185AWX-164

GWX-3O3GWX.304

2SC19192SC2575 Lot No

2SA7265

2SK34

2547502SC1400

Power transformerCarbon f i lm resistor

ï1R 1

External Appearance of Transistors and lCs

AC socket (ACOUTLET)

AC power cordReverberation assemblySwitch assemblyLamp assembly

LED assembly 1LED assembly 2

2SC94sA

Type No

2SC1384

Lot No

25A684A

25C2259

rYPe No NJM4ssgDX

1 2

2SK3OA MN3008

J

10.3 P.C. BOARDS CONNECTION DIAGRAM

R 1 2 2 Al % w ' )

P O W E RT R A N S F O R M E R

B R N O R

l O O W M A X W H TA C O U T L E T

. 2 s c l 9 l 9 o o o t ' : s \

I rql 1 I I ,t-:t J'-T 1 ..'"0' = f#^f;:.| +:":l I r' lC*Tn ,Jorri,

o ur.'qs5dox' ô''

111? lTTT:,f;;irf f;;J I fraf;t !,1 â, ;u"t l T T t"'i

t I

t2 5u ',['"1 | | !.. i

t J l J J 4 l u o p ll1

ll+oi , . - c 0

0,,,1 ^*rsoK] ?.2

ÏTt lIJ

120V6OH z

ïlt-2.2 5C

tu t f 'aR. c - - - q o ; - - - a l q l

S2o F ? .

I

;

,, l o

a L

aJou'

1IIt,

.,t_/

D lc

R E V E R B E A T

SWITCH ASSEMBLY (GWS 185 )

at4 ; iÈi r^ cr"- . f :

O r = l o g _ _ E o p - - - o ,) r _

Ttt-- T'ffi

o POWER

LAMP ASSEMBLY (AWX 164 )

RL"ERtsERÂ-IOA O\

ro----or o p---ar o p--.ar Ù éÈ* o

5 a?r-d o !----!i o !--= -lt---= Ç

o p_q c p--i, o p---q o p--+r

o d---tl o T;----6 o -

EV 10 hA6 ù

aASSEMBLY (GWM 133 )

T P 3o

IINRJT

@

oOUTPUT

@

GJ

@

oPLAY

$,

âz 2Sc2575

" Ï? ' T I I If:''-t,, I xr {ffr*,,*;"*u'I i I \ " - r I l " I t '

I v 1 s 2 0 7 6

1 ? 9 ? 9t T t c - - - - - - T l t l-*"f.;.i.f, ++l I i'u'J l À ) v I J, rvNJi l , t4558DX

" ' i t + "1 414/35

1 1 1 1 * 1t 4

f '1'lf i,-rf i tËÉJ i t l

, i, . . t | t

' ï æT Qili. r o qv ) 2

,ttt ' t

t

T Tû n " Ên t , Il+?zn, t6

1, , " t I

ÏTTTi;" I TJ J J

TÏ| * :I I '

ô ' ' 3 ' l ) ' - + l

I-,T,oiÀ r

T P 41 1 1 0I I | ' + . '

. * ';: l l lr lr1 ' t t ' ' l l ? t '

6 5 6 ' t - - {

i3' '.--- '- 1!4,* lo-Jl- ^ _;

41c/ib iil1l

* ;

" ï+ l4 r+s Ià2?0/ 16 j

I Ïlâffi i6'lÀ l

la.-4\,r"*:,

,,

\ :Jr\-.-_

" ï1i ï l I- l : ; f içl i t

2 h . l ( t / 2 w )

t. /o

I +,1 i,.+-lt I t ' J Ip , , 3 ' t ) , - + t S 2 0 7 6

T P 4 T P 51 1 1 0 1 1 0i | | ' + ' I I 1 5

* ' ; : l l l r l r *o , {n,o *I |

' . l lç1. l;!c lr00 .dlç

6 b 6 ' - e ' l | - : +t I

T3. , .ao u?

9 9 ç 9+ : - | | | |

-ii!- " + { * {,"4 ' l 4 . : 1 " . 1 l ' D 7 l ( d 1

[ J À À- D r

, , 2 l O E 2

) 3 ç 2 ? r '

: :

Rrsc0K

'*l

C ç

. D

A E L - 3 2 4*t4<'* P u t

M O f f T O R )

L E DASSEMBLY 2(GWX-304)

Ô AA E L 3 2 5

-2!(̂5) 5

( POWER'O B

L E D A S S E M B L Y 1(GWX-303)

sFl-3Cl34

NOTE:The indicated semiconductors arc representative onesonly. Other alternative semiconductors may be used andare listed in the parts list.

[ " , ' " Ar : '

R É S I S T O R S

I n d i c o t s d i n O t / 4 w , 1 5 % r o t . r o n c e u . l â s s o l h e . r i s € n o t € d

CAPACI TORS

t n d i c o t . d i n c o p o c i t y l ! F ) / v o l r o g . ( v ) ù n t € s s o i h e w s ê n o t è dp p F I n d i c o l r o h w , l h o u t v o t t o g € i s 5 O V â x c a p 1 € t € c t r o l y t i c

V O L T A G E , C U R R E N T I

T - - - V l S i g n o l v o l r o g € o r t 5 O n V o u t p u i { 1 k H z J

E O C v o r l o g o t V ) o t n o i n p u r s i g n o l

+ m A : O C c u . . e n t o t n o I n D u r i i g n o lO l H E R S

@ adjutri^g poinr

T h e A h o r h f o u n d o n . o m € c o F p o n e n t p o r t s t n d , c o i € s r h èi h p o r i o . c 6 o f l h € s o l € t y r o c l o . o f l h e D o . r T h € . € f o r € , * h e .r e p r o c r n 9 D e s u . ê 1 o û s € p o r t s o f r d 6 . t i c o l d € s r g n o t r o n

S W T T C H E S

5 | A T l E N U A T O R O d A - - 6 d A

5 2 T A P E M O N I T O R O N _ O F F

S 3 R E V E R A E R A T I O N O N O N - O F F

S 4 R E V E R B E R A T I O N O N ( R E C O R O I N G ) O N _ O F F

S 5 R E V E R E € R A T I O N O F F O N _ O F F

5 6 E F F E C T 1 _ Z

5 7 P O W E R O N - O F F

T ù . û n d s . t i n . d I n d r c o t â s t h â 3 ç i t c h p o s i t r o n

4 " ,

o z r P D 4 O 6 9 ca 1 8 2 S K 3 o A - Y

1 S 2 0 7 6M Z - O 7 5r s 2 0 7 6

t 2 a v

D 15 i rEO Ass 'v i l )

( P o w E R ) | 6 W X - 3 O 3

L À M P A s s ' y A W X - 1 6 4

|_--.-.1

. P L 2 , 4 . 6 . A

L_iie,î!lI P L t . ! , 5 , 7

L__1:.13i1S W I T C H A s 6 ' y G W S - t A 5

Il

Q 2 2 - 2 6 Z J ç é C t ? - f

a 2 7 z S C l 3 8 4 - Ro 2 a 2 s a 6 ô 4 a - RQ 2 g N J M 4 5 5 8 D X

D r , t 2 1 O E 2D r 3 r 4 M Z - 1 5 7 o o 4 7 l r s 5 7 À s G - 2 r 5

I h i s i s t h e b o s i c s c h e m o l i c d i o q r o m ' b u t l h e o c t u o l c r r c u r l

d u e l o i m p r o v e m e n i s i n d € s i g n

4

e l 3 2 S C 2 ? 5 9 - Go L 4 , r s 2 S C 1 9 l 9 - Ge r 6 N J M 4 5 5 8 O X

310.2 SCHEMATIC DIAGRAM

REVERBERATION As6 'y GwM -133

I

EFFECÎ ? O

"[."."i

T P L A Y

ta'" e It lL R E C

II

OUTPUT

I

s 6

FftCÎ I

t--lh| | lo | r roR Il _ m j a . ILED A!s ,y (2 )

G n / x - 3 0 4

tIL

!O U T P U T

liwl II

I N P U Tli5ôivl r- l

I

iI

^J:L

s I a l l a s G - t 5 0s 2 r a p E x o x t r o p  s o - z r . O l , 2 2 S C l 9 l 9 - Gs 5 , . t 5 F € v E R a E F  r o r  s G 2 r 2 Q 3 , 4 2 S A 7 2 6 S - G

a 5 N J M 4 5 5 8 0 XQ 6 2 5 C t g r 9 - G

s z - r Q 7 2 S A 7 2 6 S _ Go N o Q E M N 3 O O 8

q s , r r 2 s a 7 2 6 s - Go r o . r 2 2 5 C t 9 t 9 - G

D 7 - r O t S 2 O 7 6

a 2 o . 2 r N J M

vR2 0€P1Ha c v - t 2 5

s a - |R5 Z70k

(v)rqoNeefir

Ss/c

The basic performance of the S and S/G types are same as the KU type. This additionalservice manual is applicable to the S and S/G types, please refer to the KU type servicemanual (see pp. 2 - 18l'with exception of this supplements.

sPECtFtCAtloNsThe specifications for S and S/G types are the same as

the KU type except for following sections.

MiscellaneousPower Requirement . AC 1 1 0, 120,220 and 240Y

(Switchable)50/60H2

Furnished Parts (S/G type only)R a c k M o u n t A d a p t o r . . . . . . . . 1S c r e w s f o r R a c k M o u n t . . . . . 1

CONTRAST OF MISCELLANEOUS PART

REVERBERATION AMPLIFIER

Symbol DescriptionPart No.

BemarksKU type S type S/G type

AA

AAnr

Power transformerAC socket (AC OUTLET)

Line voltage selectorAC power cordCarbon f i lm resistorPacking caseOperat ing instruct ionsRack mount adaptor CardboardScrews for rack mount

Cardboard spacer

ATT-595AKP-OO2

ADG-O23RD%PSF 2R2J

AHD-681A R B - 3 1 6

ATT-596AKP-029AKX-063ADG.O16

AHD.681ARB-330

ATT.596AKP-029AKX-063ADG-O16

AHD-682ARB-330AÊA-O47AEA-046AHB.102

o

I

I

NOTE:The indicated semiconductors are representatiue onesonly. Other alternatiue semiconductors may be used andare listed in the parts list.

1 R E S I S T O R S

l n d i c o l . d i n O . t / 4 w ! 5 % t o t e . o n c . u â t . ! s o i h . r v È â n o t e dI i t O . M r M O

2 CAPActToRS :

lôd 'co l€d In copoc i l y ( !F ) / vo l loga (V) un l . ! i o ihar is€ ôo1.d

o p F I n d r c o l r o n w i r À o u l v o l l o g . i r 5 O V . r c a p t . t â c r r o l y l i c

3 V O L T A G E C U R R E N T

E O C v o t r o g € ( v ) o t ô o i n F u r ! , C n o l

+ m A : 0 C c u r r e n t o t n o i n o u t l i g n o l

4 O T A E R S

@ eoiusr,tg potnt

r 6 s 2 \ n o r r t o u n d o n r o n a c o d D o n . n i p o r t s i ^ d r c o i € s t h .

i h p o r t o n c . o l l h . ! o l . l y a o 6 l o r o l l h . p o r r f h € r € f o r € , e h . ô

r . p l o c ' n 9 b . . ù . . r o ù s . p o . r 3 o l r d . n r i c o l d . 3 r 9 . o l r o n

5 W T T C H E S

S I A T T E N U A T O R O d B _ - 6 d 8

S 2 T A P E M O f t I T O R O N . - O F F

S 3 R E V € R E E R A T I O N O N O N _ O F F

S 4 R E V E R E E R A T I O N O N ( R E C O R D I N G ) O N _ O F F

S 5 R E V E R E E R Â T I O N O F F O N - O F F

s 6 € F F E C T 1 - 2

s 7 P O W E R O N - _ 9 I I

s a L r N E V o L T A G E S E L E C T O R ? 2 ! l l - 2 4 O v - l 2 O v - l l O vT h . u . d a r l i n a d i n d i c o l . 3 l h a ! r r l c h p ô s r l r o n

[ " , ," Ar:220V2aov

5 0 1 6 O i rÂc PorER coF0

A D G . O I 6

i LED As6 'y (1 )

, lo'*r", l ' ; ;T:J;;: ^ E L - ! 2 5 |L - - - J

L A M P A t . ' y A w X - 1 6 4

r_--.-1

I f L t , l , l , ?

L__ï.'ï!_l L-::J%!JS W I T C H l t . ' y G W S - i 8 5

I . . , ' osen ioo. f / t9 s? ^sG-?r !

T h i s i s t h e b o s i c s c h e m o l i c d i o q r o m ' b Ù t t h € o c l u o l c r r c u r r m o y v o r v

c l u e t o i m P r o v e m e n l s i n d ê s i g ô

?20v rov

5 â I L I N E r c L l  (s Ê L E C t O F

Q l3 23C2259-Aa r 4 , 1 5 z S C t 9 1 9 - G

Q I 6 N J M 4 5 5 8 D X

o r z } J P D 4 O 6 9 Ca r E ? S K 3 O A ' Y

r - a t S 2 O 7 6D 5 M Z ' O 7 5o 6 r s 2 0 7 6

o . z ? - 2 6 z s , 2 5 7 5 - F

a 2 7 2 5 C 1 3 8 4 - R0 2 6 U S A 6 S 4 a - R

o 2 s N J M 4 5 5 a D X

AND S/G TYPE

R Ë V E R B E R A Î I O N A s s ' Y G w M - 1 3 3 -

II

EFfECT Z o

EFFECÎ I

'^F_itIIL

IOUlPUT

[6fun1 |I

I N P U Tll6ôiVl r. ' - l

I

iI

_l^IL

a " .o i,o"g IL R E C

IOUTPUT

I

L

r-t ;i ( M o N r r o R )

l _ _ a € L - r 2 4 i

L E D A ! s ' y { 2 )G W X - 3 0 4

s  r l a s G - i 5 o Q l , z 2 s c 1 g 1 g - Gs 2 1  P E M O N r r o R  5 0 _ 2 r 4

sr,4,5 R€vEFBERArron asG'zrz 31 " t^3$i333;i

Q 6 2 S C 1 9 l 9 - G

o 7 2 5 A 7 2 6 3 - As 2 - (

o N o Q s M N 3 O O B

e s . i l 2 5 A 7 2 6 5 - G

a t o . r 2 2 5 C 1 9 1 9 - G

D? ' to 152O76

ere NJM4558DXa 2 0 . 2 r N J M 4 5 5 8 D X

a c v - r 2 5

Key No. Part No. Description

1. AFiD-6812 . AHA-201

3 . . A R B - 3 1 64 . ADE{05

Packing caseSide pad

Operat ing instruct ionsConnect ion cord

RACK MOUNT ADAPTORSThe JA-R104 rack mount adaptors are available asoptions. They have a 2U size format which meetsEIA (Electronic Industries Association) standardsand so by attaching the rack mount adaptors tothe model, it can be installed into a rack conform-ing to EIA standards.

Attaching the JA-R104 rack mount adaptors1. Detach the rubber bushes from both sides ofthe

model.2. Use the mounting screws which are accessory to

the JA-R104 and mount as in Fig.A.

NOTE:The JA-R104 adaptors are 3 mm thich. When aligningthem with other Pioneer stereo components with a thich-ness of 5 mm, slide the accessory spacers behind the adap-tors and then attach (FiS.B).

Mount ing screws

Fig. A

I

Phi l l ips screwdrrver

(SPacer )

,/ ,rPrîil:.,'^'l:/ z/',îÀà,",'i*n*-'A ,/ ,/ ,screw

l@{ / /

Fig. B

stR-3ct3

10.4 PARTS LIST OF P.C. BOARD ASSEMBLIES

Reverberation Amplifier Assembly (GWM-1 33)

SEMICONDUCTORS

Part No. Symbol & Description

swrrcHEsPart No, Symbol & Description

2SC1919(2SC1400-El2SA7265(2SA750-E)NJM4558DX

MN300825C2259pPD4069C2SK3OA.Y(2SK34-Cl

2SC2575(2SCg4sAl2SC1 38425A684A

152076(1 S1 5551MZ-475{wz-075}

I roez(srB01{2}

MZ-157(wz-157)

CAPACITORS

Part No.

a1, 42, o6, or0, 4e, 414. 415

03, 04, 07, 09, 01 1

05, 016, A19-421,429

080 1 34170 1 8

o22- 426

o27028

D t - D 1 0

D5

D11, D12

D l 3 , D l 4

Svmbol & Description

ASG-150ASG-214ASG-212

RESISTORS

Part No.

51 Push (ATTENUATOR)

52 Push (TAPE MONITOR)53, 54, 55 3€ang push

(REVERBERATION}

Note: When ordering resisfors, conuert theresistance ualue into code form, andthen rewrite the part no. as before.

Symbol & Description

ACV-s08

ACV-125ACP-056

RDTTPM trtrtr JRS2P EtrOJ

A RovoPsr oco.tRD%PS DTOJ

OTHERS

Part No.

VR1 (56) Var iable resistor wi thsw i t ch (REVERB T IMEI

VR2 Var iable resistor (DEPTHI

VR3 Semif ixed 22k-B

R1 -R1 1 4 , R120 -R1 25 , R1 29 -R132R l15 -R117 , R126R 1 1 8 , R 1 1 9R127, R12a

Descriotion

Lamp Assembly (AWX-I 64)

Part No.

Terminal IREVERB, TAPE)

Svmbol & Descriotion

AK8{63

CEANL 2R2M 50cEA 100P 16CEANL OlOM 50c E A 1 0 1 P 1 6cEA 470P 16

CEAN L 3R3M 50CEANL 6R8M 50cEA 471 P 35cEA 10r P 25cEA221P 16

coMA 222J 50coMA 472J 50coMA 332J 50coMA 102J 50

coMA 682J 50coMA 153J 50coMA 223J 50ccDsL22 lK 50ccDSL330K 50

ccDs l tS lK 50ACG-009

c1-c4c12c20,c21,c23-c25, C30, C31, C40c22c2a, c29, c45, C46

c32, C33c38c41, C42c43, C44c47, C4A

c5, c14c6, c15c7 ,c11 , C l6 , C19ca, c17, c27

c9, c l8c lo , c13c36, C37c26c34, C35

c39C49, C50 Ceramic 0.047/1 50V

AEL.103AEC-558

Switch Assembly

Part No.

PLI -PL8 Lamp 8V 70mA (bar- type)

Nylon r ivet

(GWS-l85)

Symbol & Description

ASG-215ACG-O09

LED Assembly 1

Part No.

s7c51

Push switch (POWERICeramic capacitor

0.047/150V

(GWX-303)

Symbol & Description

AEL-325ABA-065

D l 5 LED (POWER}Screw 3x6

.'oLED Assembly 2 (GWX-304)

Part No. Symbol & Description

AEL.324ABA-065

LED {MONITOR)Screw 3x6

D 1 6