Sherwood S-9400 User manual

SHEFR\ATOOD

LOW

FILTER

When

depresged

reduces

rumble

from

turntable

and

low

frequency

noise.

(Attenuates

at

12

db/octave).

SELECTOR

coltTRoL

Selects

your

stereo listening

source:

PHONO

1,

PHONO

2/

MIC, TUNER,

AUX.1, AUX.2.

MoDEL

5-9400

sTEREO/DYNAQUAD

AMPLIF

IER

5ERVICE MANUAL

0

$

r

L\

ILLUTIilATED

SELECTOR

IIIDICATOR

Describes

position

of

selector

swltch.

BAtJAIiICE

Balancee the

relative

volume

levels

between

your

right and

left speakers.

SPEAKERS

S€lects

your

main

stgreo

speakers

(A),

remote

stereo

speakers

(B),

both

sets, or

turns speakers

off

(for

headphone

listening).

IODE

SWITCH

Permits

listening

to left channel

only,

right

channel

only,

stereo,

reverse

or

mono-through

both

speakers.

touDNEss

Masler

power

ON/OFF

and

volume

control

for

your

speakers.

Also

automatically

add bass

compensation

at low levels.

LOUONESS

When depressed,

defeats

loudness

control

compensation

circuit

(which

automatically

increases bass

tones

at

low

volume

levels).

HI FITTER

When depressed

cuts off

scratch

from

records,br

background

"hiss"

trom

noisy

FM stations.

(Attenual*

at

12 db/octave).

TAPE

TOI{ITOR

Permits

recording

to,

or

(depressed)

playing

back

from tape

rscorder;

permits

monltorlng

during

recording.

BASS TREBLE

Increases

bass

lncreases

treble

tones

up to

*12

tones

up

to

*12

db,

decreases

db, decreases

up to

-12

db. up

to

-12

db.

TAPE

DUBBING

Permits

recording to,

or

playing

back

from,

a

second

tape

recorder.

Also,

permits

dubbing from

one

recorder

to

the

other.

SPECIFICATIONS

PHO]IEE

For

private

listening

with

stereo

headphones.

FOUR

CHATTINEL

Controls

special

rear

panel

inpuls

and

outputs

for

a

4 channel

decoder

(may

also

be

used as

a second

tape

monitor).

Input

Senrltlvfi

(for

rated

output):

Phono,

1.8 mv.

Auxiliary,200

mv,

Mic.,2.1

mv

Input

Gapabllity

lor 1olo

dist.:

Phono,80

mv.

Auxiliary,

lnfinite

Mic.,60 mv

Hun and l{oise

(lHF}:

Phono

-60

db.

Aux.

-85

db.

Vol.

Control

Min.

-90

db.

Crosrtalk:

-45

db

@

1

KHz.

tlc.

Input lmpedance:50,000

o

GENERAL:

Power Requiremenb:

1

5-1

25V, 50/60

Hz. 20-200

watls tused.

AG Outletr:

Switched

(2)

total 180

watts.

Unswilched

(1)

200

watts.

Slze:

(X)"

H, OOo

W,

00"

D.

Shlpplng

Welght:

29 lbs.

DYITIAOUAD

Controls

built-in

Dynaquad

4 channel

matrixing circuit.

Power

Oulput: Music

power

160 watts

total

(lHF)

RllS Power

Outpul

(both

channels

driven):

60wattsx2@4

ohms, l KHz

50

watts

x2

@

8 ohms, 1

KHz

40 watts

x2

@

8 ohms, 20-20,000

Hz

Harmonic

Dlstortlon:

0.8olo I ohm rated

output,

0.10o/o

@ 10

watts.

lnlermodulation

Dlsioilldn

:

0.60/o

@

8 ohm rated

output

,

O.25o/o

@

10 watts.

Slereo and lllono

Speaker

Outpul lmpedance:

4,8,

or 16

ohms.

Stereo Headphone

Output: High or

low impedance.

Stereo Recording

Output:230

mv,2K

ohm.

Power

Bandwidth:

5-45 KHz-l

o/o

Dist.

Frequency

Rerponre:

Aux.

20-20

KHz

-t-

y2

db.

Phone:

RIAA

Std.

i

1.0

db.

Damplng

Factor:

40:1

@

I ohms.

Bass

Conlrol:

-f-

12 db.

@

100 Hz.

Treble

Conlrol:

+

12

db

@

10 KHz.

TR509

TR504

R525

VR501

PRE-AMP

BD

TR701b

TR701a

cB

52

c8 s1

c8 53

c8

54

DUPLICATES ON

OTHER

DRIVER

BD.

TR50B

I

R6241 TR505

TR702

VR7O1

TR704

TR7O5

T R7O6

T

R7O3

TR902b

TR9DZa

TR901 b

Page 2

Figure

1

TR901a

NOTE:

5-9400

AMPLIFITR

SERVICING

AND

ADJUSTMENT

To

simplify

the

following

descriptions

only the

left channel

and its

are described.

The

right

channel

is identicaL

except

for

reference symbol

numbers

o

(

See

sche-

matic

diagram

)

nff

reference

numbers refer

to Figure

I

unLess

otherwise

specified.

.

PreLiminary

checks of the DC

voltages

present

at

various

points

in

your

amplifier

can indicate whether

a transistor

is

oPen, shorted

r

or otherwise

malfunctioning. Fault

isol-ation

in

the

preampfifier,

tone

amplifier, and driver

stages

ean

generaffy

be

isolated by

checking the

DC

voltages.

Many

times

the

circuit defect

can

be

isolated

by

comparing

gain

measure-

ments

at lKHz as

indicated

on the schematic

or by

comparing

the operating

channel with

the defective

channe.l-.

AMPLIFIER

TLECTRONIC

RELAY

PROTECTION

AND

SPEAKER 5YSTEM

CHEIK5:

This

amplifier incorporates

a special eLectronic

over.load

pro-

tection

circuit

which

automatically disconnects

the

speakers

when danger

to the

power

amplifier

exists

or when danger to

the speaker

system

exists.

If there is no

output to

the

speakers,

check the speaker

connections for shorted wires

or

shorted

speakers.

(

Sp"aker

line

resistances should

not indicate less

than 4 ohm resistance

on

an ohmmeter.

)

The

Electronic

Re1ay

Protection

circuit consists

of an eJ.ectronic

switch

which

senses

two

eonditions,

output

current

and

DC

center

point

voLtage,

to

protect

both

the

power

ampl-if

ier

and the

speakets.

This

circuit limits

the

current

delivered to the

speaker

load

and

also

protects

the

speaker

from

DC

vol-tages in

the event of

an

amplifier

device

failure.

A

center

point DC

shift

is

detected

by dif f

erential- ampl-if ier TR702

and

TR703,

which

disconnects

the

power

amplifier from

the

speaker J-oad

by

way of

transistors TR704,

TR705

and

TR705,

which

deactivates a re1ay,

disccnnecting the speaker

load. The

power

amplifier

current

protection

is

obtained

by

transistors T

R701a

and T

R701b

with

associated

components,

which

sense the

current

through the

output

transistor resistors R524 and R525.

Vrlhen

the

peak

currents

reach

approximately 5 Amps,

TR70l-a and

TR701b

conduct,

causing

mul-tivibrator action

in conjunction

with

TR704, TR705,

and TR705

to

deactivate

the

relay at

a

recurring rate,

thereby

protecting

the amplifier from abnormal-

load conditions.

This circuit

will

continuely

sample

and

disconnect the

spearkel

line

untiL

the ovex-

load

condition

is removed.

While

servicing the

ampl-ifier it

will

be

valuable

to operate the

amplif

ier using a variabl-e vo.l-tage

power

Iine

(

VARI

AC

)

equipped

with a

line

wattmeter

to identify abnormal

power

consumption.

I nerease the

power

line

voltage

upward

while observing the

wattmeter.

Power

consumption

should

not exceed 10-2U

watts

(

loudness control

volume at minimum

)

.s the voltage

is

increased

Page

3

to

the rated I2O

VAC.

If

the

power

consumption

begins to

20

watts,

do NOT increase

the line

voLtage

any further

and

detexmine

whether the

malfunction is

in the

power

suPPfV

'

or

amplifier

section.

exceed

tuner,

If

the

power

amplifier

is

suspected, verify

the

center

point

voltage

at

the

+ speaker terminal

for

a

ZERO

voltage

+ 0.2V

xeading.

If

the

center

point

vo.l-tage

reads a

plus

voltage

r

suspect a

shorted

top side

driver transistor

(TR604)

or

a

short-

ed top

side darLington

output transistor

(TR508)

(schematic

shows

transistors

as the

top devices in each

channel).

If the eenter

point

voltage reads

minus,

suspect a

shorted bottom

side driver

transistor

(TR505)

or a shorted

bottom side darlington

output

transistor

(TR509

).

A

defect can

frequently

be located

by

removing

both

driver

transistors

from their

sockets.

If

Line

power

consumption

drops

considerablyr

suspect faufty

driver transistots.

If

powelc

con-

sumption remains

high

faulty

output

transistors

shoul-d

be suspect-

ed.

If

not the

pre-driver CIr associated

components

may

be

defective.

I f

the f aul-t

sti1l

exists, then

verif

y

that capacitors

are

not

shorted,

circuit

board

contains

no

sol-der shorts,

open

resistorst

poor

solder connections,

or

broken

pads.

If the

center-point

vol-tage

reads

zero

voltage

in

accordance

with

the

above check,

apply audio

signal-

to the channel

or

channel-s

being

tested

and measure

distortion.

Distortion

which

exceeds

amplifier

ratings

may

be

due to

one of

the

following:

1.

0utput transistors

are not

beta

matched.

2.

0utput

bias

requires

readi ustment.

3.

Driver transistors

aIe

not

Ploviding

adequate

s

ignal

drive.

The

following

performance indicates

a

properly oper'ating

amPlifier

with

an

I

ohm

resistive

load.

Distortion

at

2.0V:

Less than

0.15% IM or

Harmonic

(tKHz),

Typically

O.O7/"

Distortion at 10V:

Typically

A.2/o IM

or

Harmonic

(

f f

Hz

)

Typically

52

lrlatts

DuaI

Channel

at

0.8/o

(ZOHz

ZOKHz)

Typically

50

tl/atts

Singfe ChanneL

at

O.8/o

Page

4

OUTPUT T RANSI

sTOR

BIAS:

Proper output

transistor

operation

and output

bias adj

ustment

are

most important to assure

correct

performance

of the amplifiet.

Bias

adj

ustment is necessaxy if the

output transistors are ne-

placed,

*

or

if

any of the transisto:rs in the driver circuitry

r

or

the

ampLifier

exhibits one or more

of the following

symptoms:

0verheating of the output transistors

under normal-

operating

conditions.

Excessive

Low leveL I ntermoduLation

or

Harmonic Distortion more than

B.15%

at

2.O volts across

I ohms.

*It

is extremely important that

the mica insulating

washers

used

to

seperate the output transistors from their

heat sinks

be

un-

broken

and

installed

properly

with siLicon

grease

liberafly

applied

to aLJ-

surfaces

in contact

with

each

other.

Make

certain

the emitter and

base

pins

of

the output

transistors

do

not contact

any

part

of the

heat

sinks.

SUGGESTED

AMPLIFIER

TEST

BENCH

AUDIO

osc.

SCOPE

+Probe

l.

2.

SET.

UP

D.C.

VOLTMETER

RECEIVER

AC

SWITCH

POSITIONJEST

RECPTS.

I. H.

D. MEASUREMENT

2.

I.M.

MEASUREMENT

3. SINE

WAVE

MEAS.

O

-

3OO

Wo tts

WATTMETER

TO INPUT

JACKS

TO

OUTPUT

TERMINALS+

VARIAC

60 Hz

PHASE

ADJ.

6.3

VAC

t20v

60

Hz

orc.

fz<l

?u'.

iJ

it

60db ATTENUATOR

lO db

Steps

[5

-

r25 VAC

O-,5O lblts

Fig

ure

Z

Page

5

OUTPUT

AND BIAS ADJUSTMENT

USING

AN

INTERMODULATION

DISTORTION

ANALYZE

R

Connect the

amplifier for testing

similar

to

Figure

2.

Connect

an

Intermodulation

Distortion

Analyzer

with

a

ratio

of 4:1 using

6OHz and

7000H2

to the

ampLifier

(AUX)

input

and

set the

selector switch to AUX.

Set

the

volume

control

to maximum

and adj

ust

the

generator

f or an ampl,if

ier

output

of 2.O

volts

across

B

ohms.

4.

lrJhile

observing

the resultant

distortion wavef

orm, adj ust

the

bias

potentiometer

(

VR501) so that

the crossover

distortion is

at

a

point

of

being

eliminated.

(Class

ttAgtt)

Note:

Class

trAtr

operation

(continued

Clrrl

rotation) causes

output transistors

to

draw excessive

current

and overheat.

RTFE R

TO

DI AG RAMS BELO!il

I.

2.

3.

lmproper

Bios

Ad

iustmeni

Proper

Bios

Adiustment

5.

Repeat

Steps

3 and 4

for oPPosit

channel.

The following

performance

indicates

a

pxoperly operating

amplifier

with

an

B

ohm

load.

Less

than

0.15%

I M

Distortion

at 2.OV

Typically

O.2% IM

Distortion

at

10V

5O

Watts of

power

per

channel-

at O.8%,

single channel

50

h/atts

of

power per

channel

at O.8%,

Dual

channel

I f an

I ntermodulation

Distortion

Analyzer

is

not

available

r

dF

0scillator

and a

Harmonie

Distorticln Analyzer

may

be

used

for

adj ustment

of

the

output

transistor

bias as

foLIows:

l.

2.

Connect the

amplifier

for

testing

similar

to

Figure

2,

Connect an

OsciLlator

with

less

than

.O5/"

distortion

at

IKHz

to the

amplifier

(

nUX

)

input

and set the

selector

switch

to AUX.

Pag

e

5

5et

the volume

control to maximum and adj ust

the Oscillator

for an

amplifier

output of

2.O

volts

across

I ohms.

Using

the

Harmonic Distortion

Analyzer

looking at the

distortion

of the

amplifier

outputr

properly

nulled,

make

the

adjustment

as

fol-Lows:

Adjust

the

bias for

Class

frABrl

operation

by

turning the bias

potentiometer

(

VR501

)

so

that

the cxossover is

at

a

point

of

being

eliminated.

Note:

CIass

rrArr

operation

(continued

Ch',

rotation)

causes

the output

transistors

to draw excessive current

and over-

heat.

REFER TO

DIAGRAMS BELOhI

3.

4.

lmproper

Bios

Ad

iusf

ment

Adj us

t

he bias pote

ntiomete

r

the

amplifier

begins to

cause

wattage

consumption.

at O,!yo,

single

channel

at o.8%, ZOHz

-20r

000H2,

Proper Bios

Adiustmenl

5.

Repeat

Steps

3 and

4 for

the opposite

channel.

The following

performance

indicates a

properly

operating

amplifier

with

an I ohm

load

@

lKHz.

Less than 0.10%

THD

at 2.0V

Typically 0.15%

THD at

10V

60

Watts

of

pobrer per

channel

50

ldatts

of

powe

r

per

c

hannel

Dual

channel

can also

be adj

usted

by

using

a

VARI

AC

equipped

with

a

wattmeter:

Turn

the loudness controJ-

to minimum.

Bias

li

ne

1.

2.

(VR501),

to the

point

at

which

a

vexy slight increase

in

line

P

ROTECTI

ON BOARD TESTI

NG

AND

ADJUSTMENT:

Without

audio

drive.

1.

Adj

ust

VR701

for

equal

voLtage

on

the coLIectors

of

T R702

and TR703.

The

differential

amplifier is

now

balanced

so

as to

properly

prote.ct

against

+ DC

voltage

at

the

sPeaker

te rminals

.

Page

7

2.

Short

the

speaker

terminals

on

both

the

Left and

right

channel

speaker

outputs.

3

.

Con nect an audio

oscill-ator ope xating

at

lKHz

to

both

AUX inp uts

,

4.

Now,

test the

protection

board

for

proper

openation

by

increasing the audio

drive

leveJ-

to the

powex

amplifiet.

This

wilJ-

cause

the relay to

be

deactivated,

disconnect-

ing the

speaker

terminals from the

amplifier

at a recurring

rate.

This

should occur at less than 100

watts of 1ine

input

power.

Do

not audio

drive

into

a short circuit,

buyond

this input

power

1eveL.

FOUR

CHANNTL

OPERATION

The

5-9400

incorporates a

4-channel matrixing circuit.

This

simple matrixing

circuit

all,ows

recorded ambient

signals, which

are

not

reproduced

during

conventionaL

stereo

playback,

to

be

converted to

4-channeL

sound

without

additional

amplifing

equip-

ment.

By

connecting

2 additional-

speaker systems,

one each

to the

REM0TE Left

and

Right terminals, they then

become the left

rear

and

right rear

sound soulces

with the front

panel

toggfe

switch

in

the

Dynaquad

I

N

position.

hlhen the

toggle

switch is in

the

rrupil

position

the

speakers

connected

to

the REMOTE

terminals can

be

util-ized

as

a

second

set of

stereo sound

sources

in

the same

area

or

at

a

remote

J-ocation.

Page

I

PART

DESERIPTION

TRANS

I 5TOR5

2N5087

2sA505L

2

5A

640

2sc 593F

25C945P

2sc959L

25C1

000

25C121

1D

25032

3

K

25K34

cDE8002C

5P5

5456

D I ODES

15188

1

s247

3

5V-03

u-05c

v05c

wz-1

20

CAPAEITORS

ELECTROLYTIE

4.7uf

@

25U

4.7uf

@ 25V

(AXIAL)

10uf

@

15V

1

Ouf

@ 25V

1

Ouf

@

50V

33uf

@

5.3V

33uf

@ 25V

33uf

@

50V

41uf

@

10V

1

00uf

@

25U

1

00uf

@

50V

221uf

@

50V

33Ouf

@1

0V

1

000uf

@

53V

4700uf

@

50V

cAPACIT0RS,

TANTALUM

.47uf

@ 35V

4.7uf

@

15V

VARIABLE

RESI5TOR5

BIAs

ADJUsT

(1K)

S-9400 PARTs

LIsT

SCHEMATIC

REFERENCE NO.

TR501ar501b

TR505a,

505b

TR501

a, 5O1b,

5O2a, 5O2b

TR901

a

r9O1b

r912a,6OZb

TR704r705

TR503a,

503b,

604a, 5O4b

TR503a,

503b

TR801

TR608 a,

508b,

509a, 5O9b

TR502ar

5D2b

T R705

TR7U1

a,701b

1702 r7O3,

802

D701

a,701b

1702 r7O3

r7O4

D501

a,

501 b

D501ar501b

Dg01

,go2,803,804

D6O4a,

5O4b

r705,

805,

805'

851

D8

07

C501ar501 b

,9O1

a

gOZb,903a

r

903b,

904b

C9D2a

C503a,503b,504a

505a,

505b

,

5O7

a,

c81

0

C508a,

508b

C504 a

,

504b

,7

02

C6O2a

r

5O2b

C606a,605b'854

C505a,505b

c7

01

,901

b,

9O4a,

,504b,

507b

C51

0ar

51 0b

,5Olar507b

c801

,808,

809

c703

c8

53

cB

5

1

,852

C509a,509b

C

5U1

a,

501

b

2810001

I .85

PART NO.

3

02 00780

300001 01

3 0 0 00241

30200124

3020u521

3U2U0371

3020071

0

3

02

0 0421

3U300143

30400041

3U200531

3020u

590

30500260

30500410

306U01

80

30500450

30500u3u

30500370

6404347

5

541

1

347

5

640421

06

640431

05

6404s1

05

64040

3 3 5

54843335

5404s335

54A41

47 5

540431

07

6404s1

U7

54045221

54D41

337

542451

08

5424547

8

6605441

4

5606247

s

LIST*

PRICE

.90

2.go

.78

.98

.50

2

.10

-72

1

.17

4

.44

1

.26

1

.50

.30

.22

.48

.38

.55

.90

.48

.55

.32

.48

.52

.35

.56

I

.25

1.45

.

B0

3.00

6.30

.53

.85

VR501ar501b

Page 9

PART

DESCRIPTION

JARTABLE

RESIsT0Rs

(

C0NT.

)

DIFF-AMP

BALANCE

(IT)

BALANCE

C0NTR0L

(

nUnl

1

00K)

L0uDNEss

C0NTROL

w/swITcH

(DUAL

1

OOK)

TONE

CONTROLs

(

DUAL

1

OOK

)

GENERAL

SECTION

SWITCH, t4IC/ PH0N0

2

SWITCH

,

PRE-AMP

0UTIMA I N-AMP

SWITCH, LTVER

TYPE

SWITCH, M0DE

SWITCH, SPEAKER

SWITCH, SELECT0R

LAMP

(

8V-0.

1

AMP

)

LAMP

(

EV-O.25

AMP

)

THERMISTOR

D-224

FUSE

3A

MECHANICAL SEETION

MICROPHONE JACK

HEADPHONE

AND

TAPE

DUBB

I

NG JA

CK

INPUT

BD.

(,|

JACK)

I

NPUT BD.

(q

JACK

)

INPUT

BD.

(E

JACK)

INPUT

BD.

(,|O

JACK)

DIN JACK

(S

PIN)

SPEAKER

TERMINAL

BD.

(A

POST)

FUSE

HOLDER

A. C.

OUTLET

FUNCTION GLA55

(

CNII-OUT5)

TRANSF0RMER,

P0l^lER

TRANSIST0R

SUCKET,

Pob/ER

THERMISTOR

HOLDER

KN0B, LARGE

W/l4ARK

KN0B

,

sMALL

bJlMA R K

KN0B,

SLI

DE C0NTR0L

KNOB,

FLIP LEVER

EsCUTCHEON

l,'100D CABINET

FEET,

PLASTIC

POLYETHYLENE

BAG

sTYREFOAM

ENDCAPs

cART0N,

SHIPPING

SCHEMATI

C REFERENCE

NO.

VR7O1

VR551

ar 551 b

VR552a,552b

VR901

a

r9O1b,

9

O2a

r9O2b

5W2

SbJ9

5h/3r4r5r6rgr11

s!d7

5tif1

0

st|J1

PL1

,213r4r5

PL1

rl

TH501

a,501b

F1

LIST*

PART

NO.

PRICE

IN

2810004I

2820001

1

280000

53

2800

0 04 0

2730000s

27300005

27

50001

2

27100040

27

1

0D044

27100051

3700801 6

3700801

9

3070001 0

38300030

33020700

3 3030400

3

301

0'l 00

33040500

33080300

331

00300

34034001

53080200

34032001

3

40428D1

200s4001

3 s90008

5

34011002

531

52001

29058001

29056001

29

1

07

002

291 060s?

1009

1001

85034002

74A14001

81100013

89048001

85083001

.50

2

.24

4

.40

2.go

1

.44

1.26

1.95

2.34

4

.O4

.53

.66

.12

.30

.96

1

.2D

.60

1.58

2.50

2

.68

.90

3.1

0

1

.25

.50

3.66

29.95

.54

,24

1

.20

.95

.86

.55

19.75

22.80

.24

'48

6

.26

*NOTE:

Page

I

0

PRICES

SUBJECT

TO

CHANGE

h,IT

HOUT

NOT I

CE

.

MAIN

AMP

IN

VR9Ole

6

I@KBX2

&

| | ^-^

TR6Oh

TR602r

TR6OA

TR6O5.

t

H i..*tr

25A6{0

.

25A640

zscese

25A606

|

_ |

.*^

r2s^666)

(2sA666)

(?lq?SCl.

12!4!3?)

|

oJ

(2scllz{)

(2sA706)

sw-sl

I

L______.1

o

8w-roRoH

o-o

x

CIRCUIT

DIAGRAM

sw-9L

3015

TONE CONTROL

BOARD

r---TnToi"----'--

o

ooo

sw-7

r___J

6008 MAIN AMP

BOARD

r--

R66.

iT'-'

F

-{F

s'*

z

:

t

--

7

=

=3

f

--iR

?'+

F*

P

I

ST

Ff

3

ooo

o

swtd

o

()

J

d

tl

t-

o

Irl

&

()

G

d

ti

t-

a

&

o

F

-

0

J

U

z

{

SHERWooD

S-9400

STEREO AMPLIFIER

7O5T

PROTECTION

CIRCUIT

BOARD

f-_----.]

tl

sw-10

SP

SELECTOR.

I.

OFF

2.4

XB

{A+B

942-l

l2-r3-?2-

t-:L7l

CIRCUIT

DIAGRAM

5OI7

PRE

AMP BOARD

f------

-------r

{i

1l/-L

ooo

sw-7

t-'

I

rsw

lo

t\

iv

L_------]

ooo

sw-7

TAPE

REC

TAPE

MON

MICROPHON

PHONO.2

PHONO-1

TUNER

AUX-I

AUX-2

4CH

oUT

4CH

IN

TAPE

REC

TAPE

MON

MICROPHON

PHONO-2

PHONO-1

TUNER

AUX.I

AUX-2

lCH

oUT

lCH

IN

C55la

SI{-SL

0.056

-

MAINAMP

IN

stv-9L

9015

TONE CONTROL BOARD

r---

Tn3bii---'--

|

2SC693FU

3E-AUA.Q!JI

TR9O2o

I

FY

66

di

JI

xl

t5,

ra

AN

;iN

tr

+

SW-I

INPUT

SELECTOR

SW

SW-z

PHONO-z/ltilC

SELECTOR

SW

SW-3

TAPE

MONTOR

SW

SW-{

FOUR

CHANNEL

INPUT

SW

A

SW-5

LOW

FILTER

SW

5I

sw-6

LoUDNESS

SW

SW-?

MODE

SELECTOR

SW

SW.6

HIGH

F:ILTER

SW

SW-g

PRE-AMP

MAIN-Arrtp

SEPARATE

SW

sw-10

sP

SELECTOR

SW

SW-ll

DYNA

QUAD

SW

sw-rz

FoWER

O[{/OFF

SW

s:w- 12

FI

UPPLY

BOARD

r2-15-?a-

t-3-r:1

NOTES

:1

I

sr

Ot

a

tt

a

=

z.

H

(fI

F-

I

(f,

-

H

J

SI{ER.\

aOQIJ

ELEcTRDNIC

LABoRAToRIES;

INC.

4300

N0RTH CALIF0RNIA

AVENUE, CHICAG0,

ILLIN0IS

505'|

B

(ttZ)

478-7300

Sherwood S-9400 User manual

Sherwood S-9400 User manual

Related papers

Other documents