Pioneer SA-8500II Manual de usuario

D(t;

(Dr:roruecn

sA-a5C,Cltr

^ MODEL

SA-8500IICOMES

lN FOURVERSTONS

DTSTINGUISHED

ASFOLLOWS:

This

service

manualisapplicable

to theKu-type.

WhenreparingtheKC-type,Hc'typeorS-type,

please

seetheadditionalservice

manual.

CONTENTS

CONNECTIONDIAGRAM

SPECIFICATIONS

BLOCK

DIAGRAM

5,2 ToneControls

LEVELDIAGRAM

FRONT

PANEL

FACILITIES

CIRCUITDESCRIPTIONS

5.1 EqualizerAmplifier

*r: 5.3 Power

Amplifier

5.4 Protection

Circuit

5.5 PowerSupplyCircuit

PARTSLOCATION

8.1 FrontPanelView

DISASSEMBLY

8.3 Top

View

8.5 RearView

ADJUSTMENT

4.2 FrontViewwith PanelRemoved

8.4 Bottom

View

10.

Type Voltage R€marks

KU 120V

only UL {U.S.A.)

approved

KC 120Vonly CSA (Canada)approved

HG 22OV and 24Ov (Switchable) SEMKO

(Sweden),

NEMKO

{Norway},

DEMKO

(Denmark)

andEl {Finland}

approved

s11OV. 12OV. 22Ovand

24OV

{

Switchable

}Generalexport model

t\ EXPLODEDVIEWS

11. SCHEMATIC

DIAGRAMS.

P.C.

BOARD

PATTERNSAND

PARTS

LIST

11.1 Miscellanea

11,2 Schematic

Diagram

11.3 SwitchAssembly

(AWS-108)

11.4 Phono

JackAssembly

(AWX-I07)

11.5 EqualizerAmplifierAssembly

(AWF-023)

11.6 Control

AmplifierAssembly

(AWG-044)

11.7 Power

AmplifierAssembly

(AWH-05I

)

12. PACKING

-l

)1.

SPECIFICATIONS

Semiconductor

Transistors .....47

Diodcs.. ......29

Power Amplifier Section

Circuitry

. 2-stagcdifferenrial

amplifier

parallcl

PPdirect-coupled

OCL.

ContinuousPower

Outputform 20Hertzto 20,000Hertz

(Both

channelsdriven)

. . 60watts

per

channel

(8ohms)

75watts

per

channel

ohms)

TotalHarmonicDistortion

at20Hertzto 20,000Hertz

Continuousratedpoweroutput .... 0.O5o/o

3owatts

per

channcl

power

output,8ohms

. . . . 0.01y.

Iwatt

per

channel

power

output,8ohms

. . . . . . 0.01%

lntermodulationDistortion

Continuousrated

power

output . . . 0.05%

3owatts

per

channel

power

output,8ohms

. . . . 0.01%

Iwatt

pcr

channel

power

output,8ohms

. . . . . . 0.01y.

Frequency

Respon5c

.. . . . 5Hertzto100,000Herrzl0,dB

lnput

(Sen

sitivity/

pedance)

POWERAI\4PlN

..... ... 1V/5Okohms

Output.. .. Speaker: A.B,A+B

Preamplifier Section

Circuitry

Equalizer

amplifier:lst stagedifferential

amplifier

stagedirect-coupled

A classSEPP.

Controlamplifier: lst stagedifferential

amplifier2-

stagcdirect-coupled,NFB

type.

Input

(Sensitivity/l

mpcdance)

PHONOl . . . 2.5mV/50kohms

PHONO2 . . . 2.5mV/50kohms

CARTRIDGELOAD. . . . . BothPHONO

I and2,100,

200,300,400pF

TUNER

. .. 150mV/50kohms

AUX ... .. 150mV/50kohms

TAPEPLAY1...... 15OmV/5Okohms

TAPEPLAY2........ l50mV/5okohms

PHONO

OverloadLevel

(T.H.D.

:0.05%)

PHONOL ...250mV(1kHz)

PHONO2 ....250mV(1kHz)

Output

(Level/

pedance)

TAPEREC1...... 150mV

TAPEREC2...... .........'l50mv

PRE

OUT lv/2kohms,

6V/2kohms

(Max.)

TotalHarmonicDistortion

(20H2

20,000H2)

...... ..... o.o2.A

FrequencyResponsc

PHONO

(RIAA

Equalization)

TUNE

R,AUX,TAPEPLAY

Filter

LOW

......

....

H|GH..........

Loudness

Contour

(Volume

controlsetat

sA-a5ClC'II

20Hzto20,000H2

t0.2dB

.5Hzto 50,000H2

?dB

ToneControl

BASS... ... r10dBl25Hzl5l9zll01Hz)

TURNOVERfrequency1Q0Hzl200Hzl4O0Hz

TREBLE. ...i10d8(8kHzl'l6k9zl32k1z)

TURNOVERfrequency2kHzl4kHzlSkHz

... 15Hz

(6dB/oct.)

. . 8kHz

16d

B/oct.)

40dB

position): +6dB

(100Hr)

+3dB(1okHz)

Hum

and

Noise

(lH

short-circuited,

A network)

PHONO.

TUNER,

AUX,TAPEPLAY

. . .

l\4uting

Miscellaneous

Power

Rcquiremcnrs 120V60Hzonly.

Powcr

Consumption l80watts

(UL)

390VA(CSA),

490watts

(Max.)

Dimensions . a20(W)

x 150

(H)

x 376

(D)

16-9116x 5-118x 14-13116

Weighl . . WithoutPackage:

13.9kg

(301b

l0oz)

With

Package: 15.8kg

(341b

13oz)

Furnished Parts

Operating

Instructions .......1

Connection

Cord

with

PinPlugs ........1

Hcx.Wrench

(Used

for fasteningVolume

Knob). . . . . . 'l

NOTE:

Specificotions

ond thedesign

subjectto possible

modifica-

tionu,ithoutnoticedue

to improuements.

...75d8

. ..95dB

0,20d8

I Headphone: Low

impeddnc

r DampingI dclor

(20Hert1

lo 20.000Hcrt./,

8ohm:) . . . 30

Hum

andNoise

(lHF,

short-circuited,

A network). . 110d8

CONNECTION

DIAGRAM

TURNTABLE1 TUNER

TURNTABLE

'r'l

CARTRIDGE

TAPEPLAYE

TAPEDECK2 JU

-n

Connectto

ground

terminals

etc. GROUND

LEA

GROUNDING

TOEARTH

A SPEAKE

RSYSTEM B SPEAKER

SYSTEM

FRONT

PANEL

FACILITIES

BASSTURN

OVERSWITCH

Selects

thefrequency

below

which

theBASS

controt

tonc

adjustments

apply.

Ser

swirchto 100H2,

200H2

or 40OHz

accordingto listening

room

andspeaker

system

character-

isticsorpersonalpreference.

TONE

SWITCH

ln theON pos;tion,

toneadjustments

canbe

performed

with the BASS

and

TREBLE

controls.

When

setto the

upper

(OFF)position,

the tone

control

circuits

aredis-

engaged

andfrequency

response

isflat.

Thisfunction

convenient

for checking

phono

cartridge

andspeaker

tone

quality

andlistening

room

acoustics.

Setto ONposition

to energize

54-850011.

Aftersetting

ON, there

isa brief

delay

before

sound

isobtained.

This

is due to the operation

of the muting circuit which

prevents

noisewhen

the PowER is

switched.

Thisfunc-

tion does

not indicate

difficulty

and normal

operating

condition

isattained

inafew

seconds.

ThePOWER

switch

also controls

the rear panel

SWITCHED

convenience

outlets.

PHONES

JACK

When

listening

withstereo

headphones,

connect

them

this

jack.

NOTE:

SetSPEAKERS

switch to OFF when listening

only with

headphones.

SPEAKERS

SWITCH

Selects

speaker

system

operation.

OFF: Sound

notobtained

fromspeakers

(when

using

headphones).

A: Sound

obtained

from speakers

connected

to A

speaker

terminals.

B: Sound

obtained

from speakers

connected

to B

speakers

terminals.

A+B: Sound obtainedfrom speakers

connected

both

A andB

speaker

terminals.

NOTE:

When listening with headphones or to temporarily inter-

rupt the speaher sound, set switch to OFF or to an

unusedspeaher position.

BASS

ANDTREBLE

CONTROLS

Controlsfor adlusting

lowandhigh

frequency

tones.

With

the TONEswitch

setto ON, turningthe BASS

control

clockwise

from

centerenhances

thefrequency

bandbelow

the point selected

by the BASS

TURN OVER switch,

while counter-clockwise

rotation

attenuates

this band.

In a sinrilar

manner,

the TREBLEcontrol

adjusts

the

frequency

range

above

the

point

selectedby the

TREBLE

TURN OVERswitch.

TREBLE

TURN

OVER

SWITCH

Selects

thefrequency

above

which

theTREBLE

control

tone adjustments

apply.

Set to 2kHz, 4kHzor SkHz

according

to listening

roomand

speaker

systemcharacter-

istics

or personal

preference.

t'-""1

LOWFILTER

SWITCH

Set

to 15Hz

position

in the

event

thatturntable

rumble.

recording

cutting noise

or other low frequency

noise

becomes

jectionable.

Attenuation

in the frequency

band

below

15Hz

6dB/octave.

HIGH

FILTER

SWITCH

Set

to 8kHz

position

if record

scratch

noise

orother

high

frequency

noise

becomes

objectionable.

Attenudtion

thefrequency

band

above

8kHz

6dB/octave.

BALANCE

CONTROL

Control

for

adjusting

stereo

balance

between

left

andright

speaker

systems

or headphones.

Turn clockwise

from

center

to increase

right

(R)

channelvolume

and

counter-

clockwise

from center

to increase

left(L) channelvolume

order

toobtain

abalance.

VOLUI

Adf

usts

atten

arbitrar

binatior

wider

CARTR

Switch

match

t--

I MUflN(

I SwitchI

I control

I volume

I the ne(

I controt.

LLOUDN

When

lis

enhance

numan

(

switch

POWER

SWITCH

lones.

With

SScontrol

)andbelow

switch,

thisband.

idjusts

the

ETREBLE

control

zor 8kHz

Icharacter-

f'-"''r

ablerumble,

uency

noise

e frequency

rrother

high

tenuition

left

andright

ckwisefrom

andcounter-

lnnelvolume

CARTRIDGE

LOAD

SWITCH

Switch

for selecting

phono

circuit

match the load capacitance

of theinputcapacitance

employed

cartridge.

VOLUME

CONTROL

Adlusts

speaker

and headphonevolume.

Scale

indicates

attenuation

in dB with maximum

volume

assignedan

arbitrary

value

of 0dB.

Controlcanalso

beusedin com-

bination

with theMUTING

switchto Drovide

afiner

and

wider

rangeof adjustment.

sA-A5Clcltr

FUNCTIONSWITCH

Selects

desired

playbackprogram

source.

PHONO2: To play

recordson aturntableconnectedto

the

PHONO

2 jacks.

PHONO1: To play

recordson a

turntable

connected

thePHONO

iacks.

TUNER: To listen

to broadcasts

with a tunercon-

nectedto theTUNER

iacks.

AUX: To play

component

connectedtotheAUX

iacks.

TAPEMONITORSWITCH

Employfor tape

playback

or to monitora recording

progress.

: Playback

or monitoring

of a tape deck

connectedto theTAPE1

jacks.

SOURCE: Be sureto setto this position

whennot

usingthetapedeckfor playback.

2: Playback

or monitoring

of a tape deck

connectedto theTAPE2 iacks.

NOTE:

Whenlisteningto recordsor broadcasts,be

sureto set

this switch to SOURCE.Sound will not be obtained

from speahersif setto I or 2.

TAPEDUPLICATE

SWITCH

Employwhenusingtwo tapedecksfor duplicationor

editing.Besure

to setto the

OFFpositionatothertimes.

1 -->

2: Duplicationof tape

from TAPE1(playback

mode)

to TAPE2 (recording

mode).

OFF:

)

T'"-'-l

(0rrrorueen IEREO AMPL $A-8500

[

MUTING

SWITCH

Switchfor reducingvolume

by 20dBfromthe

VOLUME

control

setting.Convenient

for temporarily

reducingthe

volumewhen

changingrecords

of tapes,

since

iteliminates

the need for continuallyread

justing the VOLUME

control.

OUDNESS

SWITCH

Whenlistening

atlowvolume

settings,

setswitchtoONto

enhance

low andhighfrequencies.

The response

of the

human

ear

to sounddiffers

accordingto loudness.This

switch

compensates

for

thiseffectatlowvolumes.

Set to this position

when not using

the

duplicationfeature

(this

includessimultane-

ousrecording

with two tapedecksandtape

playback).

Duplicationof tapefromTAPE

2 (playback

mode)toTAPE1 (recording

mode).

SWITCH

Reversesleft

andrightchannelstereosignals

andreproducesthemstereophonically.

2- 1:

MODE

REV:

STEREO: Setto this

position

for normal

stereorepro-

duction.

L + R: Mixes left and right channelsignals

and

reproducesthemmonophonically.

L: Left channelsignal

is reproduced

mono-

phonically

frombothspeakers.

R: Right channel

signalis reproduced

mono-

phonically

frombothspeakers.

4.BLOCK DIAGRAM

Ssa o

S+a-d

' TAPE

MONITOR

1.TAPEI 2 OFF

3. TAPE

Ssa-c

,X0DE

1 REV

3. LrR

2 STEREO

I oncc I POwrn

PRE

TREBLE

CONTROL

AMPLIFIER l-

PRE

POWEF

SV'JITCHES

Sra-d'FUNCTI0N

PH0N0

3 TUNER

Szo,b,C

SELECIOR

100pF

3. 300pF

S3o-d,DUPLICATF

l*2

3.2*1

sqc

s+a Ssa VRza,b

,BA

LANCE

ra,u'

V0LUIIE

6 VRru

rbo,b

Sra,

Sao,

Sso,

Stoo,

' IlUTING

: TOUDNESS

' HIGH

FITIER

' LOW

FILTER

.TONE

'SPEAKER

] OFF ?

3 B 4.

OFF

- -20d8

OFF

- BkHz

OFF 15Hz

OrF

- 0N

A+B

Srz RE

LAY

S13

. POWEROFF

S1a

' BASSTUR

I 100H2

7.',

a / ^^ |

J..tLrul.'17

Sl5,TREBLE

TURN

Tk\z l.

3 BkHz

PHONO

PH(')NO

AUX

NFR

LEFT

CHANNEL

RIGHT

CFIANNET

EQUALIZER

AI'lPLIFIER "l

1t1

vTAPE

|PLAY

LREc

-PLAY

TAPE

LREC

q^^

Sno

5+u

o6b

vRto

J2i) .PLAY

TAPE

.REC

. PLA'l

TAPE2

LREC

2. Pr-10N0

AUX

2 200pF

400pF

2. OFF

EQUA

LIZER

AIlPLIFIER CONTROL

AHPLIFIER

4 L Srra-a

. RE

LAY

POIIEROFF

- ON

. BASSTURNOVER

l00Hz

2.200H2

3.400H2

TREBLF

TURNOVER

LkHz 2. 4kl,z

BkHz

r-WER

AI1PLTFIER

PROTECTION

CIRCUIT

pnotection

clr^cuit

pnotection

circuit

Toequalizer^

amp

Tocon

fr-oI amp

Topowen

amp r

ch powenampl

proteclron

circuit

eguallzen

amP

Contr0

I amP

ch powenampL

u9o

JIo

o8a

TJJ

FIER LEFT

CHANN

RIGHT

CHANNEL

f rloru,s

SPEAKFRA

* "sb

ISeu

PRE

OUT

POWER

Topr

otection

cir-cuit ;I

e13

AC LTNE

Srz

Srs

u14 r0

POWER

AIlPLIFIER

Srs

A5.CIRCUIT

DESCRIPTIONS

z=50Krt

c) c=roopr

PHONO

CARTRIDGE

LOADSWITCH

sA-El5ClClII

-vcc

lr.

Fig.

L Schematicdiagram

of equalizeramplifier

,li 5.1 EOUALIZER

AMPLIFIER

The circuit diagram for the equalizer amplifier is

shown in Fig. 1. The two separatephono inputs

are selected by the FUNCTION selector on the

front panel. The input capacitanceon the PHONO

terminals can be adjusted to 4 different levels

(100pF, 200pF, 300pF, and 400pF) by meansof

the CARTRIDGE LOAD control knob which

switchesin, or out, additional capacitorsin parallel

with the input terminal. Hence, the load capaci-

tance of the phono cartridges can be changed,

greatly effecting the cartridge's frequency response

in the high frequency range, and thus providing

considerablevariation in its characteristics.

The first stage

of the equalizer amplifier (Q' & Qr)

isadifferential amplifier usingPNPtransistors.The

next stage

(Q.) is a bootstrap circuit employing C' ,

R1 to provide high voltage gain. The output stage

(Qo & Qr) is a complementary-symmetrical SEPP

circuit, whose high voltage utility factor results in

a high output voltage. This gives the equalizer

amplifier a very wide dynamic range,and an over-

Ioadinput level

of 250mV (RMSat lkHz) with no

morethan 0.05%distortion.

The equalizerelements

(Cr, C.,,

R, andR.) consist

of polypropylene film capacitors

(tolerance127o),

and metal frlm resistors

(tolerancet1%). Phono

equalizer

RIAA deviationhasbeen

reduced

to less

than10.2dB (2OHz

- 2OkHz\.

5.2 TONE

CONTROLS

Incoming signalsareamplified to the required level

by the 2 stage amplifier which usesa differential

amplifier at first stage.The tone control circuit is a

collector-basenegative feedback circuit (NFB) and

features 3 tumover frequencies for both bass

and

treble.

The basic principles of the NFB type tone control

circuit areoutlined in Fis. 2.

'fl

0d0ut

hI|lt n, vn, n,

L.-

,,,

-{P

,c. d

Fi1.2.

t, vR, R,

Basiccircuitryof NFB

typetonecontrolcircuit

iri

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