Yamaha CR-840 User manual

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3

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1!_

HI

5

mwsm.

~3S5Sg5i&'

••

:*

iVaafe*-:

YAMAHA

offers

you

thanks

and

congratulations

on

your

choice

of

the

CR-840

Receiver.

Embodying

the

most

up-to-date

and

useful

features,

it

combines

superb

broadcast

reception

with

the

finest

audio

quality,

and

is

currently

setting

new

standards

for

receiver

perform¬

ance

in

its

class.

1.

All-in-One

Excellence

Accurately

matched

performance

specifications,

functions,

and

controls,

provide

an

overall

per¬

formance

which

fully

measures

up

to

Yamaha's

high

tuner,

preamplifier,

and

power

amp

standards.

2

.

Noise-Distortion

Clearance

Range

This

is

the

basic

concept

for

the

audio

section.

The

CR-840

offers

an

extremely

wide

range

of

output

power

level

for

which

both

noise

and

dis¬

tortion

are

below

the

rated

value,

to

ensure

a

wide

dynamic

range

in

actual

use.

3.

Direct

Assessment

of

Differential

Gain

This

sophisticated

technique

enables

Yamaha

to

combine

high

station-receiving

ability,

razorsharp

tuning,

and

ultra-low

distortion

in

the

tuner

section.

4.

Optimum

Tuning

System

The

OTS

system

will

take

over

from

you

the

fine-tuning

needed

to

obtain

minimum

distortion

and

maximum

stereo

separation,

so

that

all

FM

stereo

programs

are

heard

at

their

best.

5.

T

win-Meter

FM

Tuning

with

Signal

Quality

Reading

Both

signal

strength

and

center-zero

FM

tuning

meters

are

provided

on

the

CR-840,

with

the

signal

strength

meter

doubling

as

a

signal

quality

meter

on

FM.

8.

Comprehensive

Tone/Filter

Controls

Both

bass

and

treble

controls

have

completely

"FLAT"

central

positions.

High

and

Low

filters

are

also

provided.

7.

Continuous

Loudness

Compensation

This

Yamaha

'special'

fully

compensates

for

the

ears'

reduced

sensitivity

to

bass

and

treble

frequencies

at

low

listening

levels,

whatever

your

normal

maximum

listening

level.

8.

Auto

DX

Circuit

for

High

Quality

Reception

The

Auto

DX

Circuit

permits

the

IF

range

to

be

automatically

modified

according

to

the

quality

of

the

broadcast

being

received,

thereby

ensuring

high

sensitivity

and

high

selectivity

in

reception.

Special

Featurers

of

the

CR-840

Receiver.

...

2

Cautions—Read

this

before

Operating

Your

CR-840

..

3

Front

Panel

and

Controls

.

.

.4

Connection

Diagram

....

.

7

Rear

Panel

and

Connections

I.

8

Broadcast

Reception

....

.10

Listening

to

Records

.1.

.

.

.

LOUDNESS,

FILTERS,

and

TONE

Controls.

.14

The

Special

REC

OUT

Selector

Switch

....

15

Tape

Playback

and

Recordina

J

.

.16

1

Specifications.

.

18

Troubleshooting

J.

...20

Block

Diagram..

■

.22

Schematic

Diagram.

.23

IMPORTANT!

Please

record

the

serial

number

of

your

unit

in

the

space

below

_

Model

Name

CR-840

Serial

No.

___

The

serial

number

is

located

on

the

rear

of

the

chassis.

Retain

this

Owner's

Manual

in

a

safe

place

for

future

reference.

The

CR-840

is

a

high

performance

AM/FM

stereo

receiver,

with

excellent

selectivity,

sensitivity,

low

distortion,

and

high

output

power.

This

manual

is

required

reading

if

you

are

to

get

the

best

from

its

special

features

and

controls.

Do

not

drop

or

otherwise

jar

the

CR-840,

which

is

a

precision

electronic

instrument.

Do

not

place

the

CR-840

where

it

will

be

exposed

to

direct

sunlight,

excessive

heat

(for

instance

over

a

radiator),

cold,

moisture,

or

dust.

Do

not

use

chemical

solvents

(such

as

benzene

or

alcohol)

to

remove

traces

of

dirt.

Wipe

only

with

a

soft,

slightly

damp

cloth.

The

CR-840

is

so

heavy.

When

installing,

make

sure

to

select

a

firm

and

solid

base.

Do

not

attempt

to

carry

out

internal

adjustments

or

repairs.

Leave

these

to

your

local

authorized

service

representative.

Do

not

assume

your

CR-840

is

faulty

before

checking

the

'Trouble

Shooting"

list

provided

on

page

20

to

21.

Do

not

connect

other

audio

equipment

to

the

spare

AC

outlet

sockets

on

the

rear

panel

if

the

equipment

will

require

more

power

than

the

outlets

are

rated

to

provide.

Keep

this

manual

in

a

safe

place

for

future

refer¬

ence,

and

refer

to

it

frequently

until

you

are

completely

familiar

with

all

CR-840

controls

and

functions.

Warning

-

to

prevent

fire

or

shock

hazard,

do

not

expose

this

appliance

to

rain

or

moisture.

Operate

all

switches

and

knobs

in

accordance

with

the

instructions.

Avoid

applying

undue

force,

which

should

never

be

necessary,

and

do

not

attempt

to

use

in

between

switch

positions.

3

^POWER

OFy/OFF

Switch

Switch

ON

to

activate

the

main

electrical

supply.

Leave

OFF

while

familiarizing

yourself

with

the

controls,

and

while

connecting

other

audio

equip¬

ment.

@POWER(

Power

Indlicstsor)

This

Jight-emitting

diode

gives

visible

indication

of

the

Power

being

ON.

§SIGWAL

QUALITY

IVSsSer

This

meter

indicates

the

signal

strength

for

both

AM

and'

FM

stations,

and

also

indicates

the

presence

of

FM

interference

by

oscillations

of

the

meter

indicator,

with

the

amplitude

of

the

indica¬

tor

fluctuations

showing

the

extent

of

the

interference.

0The

FM/AM

Tuning

E!e®ie

The

upper

scale

gives

FM

station

frequencies

in

MHz

and

the

lower

scale

gives

AM

frequencies

in

kHz.

On

the

right-hand

side

of

the

front

panel,

the

LEDs

light

to

indicate

FM

or

AM

operation.

4

This

is

used

when

tuning

in

FM

stations:

the

indi¬

cator

points

to

dead

center

when

the

station

is

perfectly

in

tune.

©DIAL

POINTER

Turn

the

tuning

knob

to

align

this

pointer

to

a

desired

station.

@HEC

OUT

SELECTOR

This

selects

which

program

source

will

be

recorded,

just

as

input

selector

selects

which

program

source

will

be

heard.

With

the

CR-840,

you

can

listen

to

one

program

source

while

recording

any

other

{copy

a

friend's

tape

while

listening

to

FM,

etc.).

This

eliminates

"dead"

time

while

you

are

taping,

permitting

you

to

enjoy

the

use

of

your

CR-840

while

recording.

©IWPUT

SELECTOR

This

selector

switch

is

used

to

select

the

program

source

of

your

choice,

whether

it

be

Phono,

Tuner,

one

of

two

tape

decks,

or

Aux

(for

use

with

8-track

tape

cartridge

playback,

etc.).

The

phono

switch

position

input

circuit

is

designed

to

operate

with

normal

moving

magnet

(MM)

type

cartridges.

Use

of

some

moving

coil

(MC)

type

cartridges

is

possi¬

ble,

but,

other

low

output

moving

coil

cartridges

may

require

use

of

a

step-up

transformer

or

a

head

amplifier.

Use

this

control

to

give

the

volume

of

sound

that

you

require.

Always

start

with

it

turned

fully

to

the

left

(counter-clockwise)

at

the

"0"

position

before

turning

it

up

to

the

volume

level

you

re¬

quire

(clockwise).

If

the

DX

indicator

light

is

on

when

the

IF

MODE

switch

is

in

the

Auto

(

M

)

position,

it

signifies

that

the

tuner

is

operating

in

the

DX

MODE.

When

tuned

to

a

powerful

local

station,

the

local

mode

takes

over.

(AM

iodlea^or)

This

indicator

comes

on

when

receiving

an

AM

broadcast.

USTEREO

(Stereo

Indicator)

This

indicator

comes

on

automatically

when

FM

stereo

broadcasting

is

received

and

goes

out

auto¬

matically

when

there

is

monaural

reception.

§BLEND

(

Blend

Indicator

8

)

This

indicator

comes

on

automatically

when

the

signal

you

receive

is

weak.

In

weak

reception

areas,

when

a

hissing

or

high

pitched

noise

makes

for

poor

FM

stereo

reception,

the

blend

circuit

will

cut

in

to

cancel

the

high-range

noises.

It

operates

when

the

IF

MODE

switch

is

in

AUTO

(

MJ.

®OTS(OTS

Indicator

1

)

If

the

OTS

indicator

light

is

on

when

the

FM

Muting/OTS

switch

is

in

the

ON

(

J8L)

position,

it

signifies

that

the

Optimum

Tuning

System

will

correct

any

slight

mis-tuning,

to

assure

optimum

reception

of

FM

stations.

§PHONES

A

and

B

Jacke

Two

headphone

jacks

are

provided.

Plugging

into

the

jacks

does

not

cut-off

power

to

the

speakers,

so

it

is

necessary

to

use

the

off

position

of

the

speaker

selector

switch

if

you

do

not

want

the

speakers

to

function.

fSPEAKER

With

this

switch

you

can

select

either

(A

or

B)

or

both

(A

+

B)

of

two

sets

of

stereo

speaker

systems.

§LOCAL

(Local

Indicator)

It

lights

up

during

Local

(general)

reception.

When

the

IF

Mode

Switch

is

in

Local

(

-**•),

however,

it

remains

lighted

regardless

of

distant

or

local

re¬

ception.

®LQW

and

NIOH

FILTERS

The

low

filter

gives

a

sharp

12

dB/octave

cut-off

below

25Hz.

The

high

filter

has

6

dB/octave

cut¬

off

slope

at

frequencies

above

8

kHz.

©LOUDWeSSB

Control

This

boosts

the

extreme

low

and

high

frequencies

to

compensate

for

our

ears

7

reduced

sensitivity

to

these

frequencies

at

low

volumes.

Set

it

to

the

FLAT

position

while

the

VOLUME

control

is

set

to

your

normal

maximum

listening

level.

Turning

it

counter-clockwise

will

reduce

the

volume

while

retaining

the

natural

balance

between

low

and

high

frequencies.

||BASS

and

TREBLE

Controls

The

bass

and

treble

controls

have

a

low

turnover

frequency

of

350

Hz

and

a

high

turnover

frequen¬

cy

of

3.5

kHz

respectively.

In

the

flat

positions,

the

tone

control

circuits

7

frequency

response

is

completely

flat.

@

PHESEWCE

Control

This

control,

centered

about

3

kHz,

readily

adjusts

for

mid-range

characteristics.

iOALANCIE

Control

The

balance

knob

controls

the

difference

in

out¬

put

volume

between

the

L

and

R

{left

and

right)

stereo

channels.

Set

this

control

to

the

center

"Q"

position,

at

which

there

is

a

click

stop,

unless

you

need

to

correct

for

a

lack

of

balance

between

the

audio

level

of

the

two

channels,

or

to

correct

for

a

listening

position

which

is

not

equidistant

from

the

two

speakers.

The

balance

control

reduces

the

volume

from

the

left-hand

speaker

when

turned

clockwise,

and

reduces

that

from

the

right-hand

speaker

when

turned

counter-clockwise.

©IVSQDe

Switch

This

gives

the

choice

of

stereo

or

monaural

reproduction.

Note

that

in

the

mono

position

the

amplifier

section

will

reproduce

all

sounds

{includ¬

ing

FM

stereo

programs,

etc.)

monaurally.

®

ADAPTOR

Bwi&ch

When

connecting

a

Graphic

Equalizer,

Dolby

Unit

or

any

other

audio

equipment

to

Adaptor

termi¬

nals,

set

the

ADAPTOR

switch

to

ON.

Make

sure

to

keep

it

OFF

when

not

used.

Leave

OFF

while

not

connecting

any

other

audio

equipment.

®IF

MODE

Bwifcoh

With

this

switch

in

Auto

{

M

),

Local

{general)

function

automatically

switches

to

DX

{long

distance)

so

please

leave

the

switch

in

this

position

for

normal

use.

Switching

to

Local

(

-)

position

compells

the

tuner

to

stay

in

the

Local

mode

regardless

of

remote

or

local

signal

reception.

©

SVB

UT1IMG

/OTS

Switch

When

this

switch

is

in

the

ON

position,

the

Opti¬

mum

Tuning

System

{OTS)

will

minimize

the

effect

of

any

mis-tuning,

and

will

ensure

continued

optimum

reception

of

FM

stations.

In

the

OFF

position,

accurate

manual

tuning

is

essential.

Even

in

the

ON

position,

however,

OTS

is

automatically

switched

off

when

you

touch

the

tuning

knob,

permitting

manual

tuning.

The

FM

muting

function

ensures

that

both

inter-station

noise

and

weak

signal

strength

stations

will

be

muted.

In

the

OFF

position

even

the

weakest

stations

will

be

heard.

®

TUNER

FM/AM

Switch

This

determines

whether

AM

or

FM

stations

will

be

received.

0TtJWII%Se

Knob

The

large

tuning

knob

gives

smooth

and

positive

station

selection,

with

a

precision

flywheel

mecha¬

nism.

6

ANOTHER

PIECE

TAPE

DECK-1

TAPE

DECK-2

GRAPHIC

EQUALIZER

AUDIO

EQUIPMENT

TURN

TAEILE

(with

MM

Type

Cartrigde)

7

M

AfyT

75^

UNBAL

The

75£2

UNBAL

(unbalanced)

terminal

is

used

for

an

unbalanced

type

75£2

coaxial

cable.

(Refer

toPIO).

§Antenna

Connections

Detailed

instructions

on

AM

and

FM

reception

are

given

on

pages

10

to

12,

but

a

quick

check

of

CR-840

tuner

functions

can

be

carried

out

by

connecting

the

T-type

indoor

antenna

provided

with

the

CR-840

to

the

terminals

marked

300^2

BAL.

Attach

the

two

arms

of

the

"T",

fully

extended,

to

the

ceiling

or

walls

of

your

room.

The

quick

check

can

be

carried

out

with

the

selector

switches

vertical

and

all

push

button

switches

in

the

out

(

JIL)

positions,

except

for

the

speakers

selector

switch

(when

you

wish

to

hear

the

output

on

your

speakers

rather

than

using

headphones).

^SPEAKER

The

CR-840

can

handle

two

sets

of

speakers

(A

and

B),

with

selection

of

either,

both,

or

neither,

by

use

of

the

Speakers

Selector

switch

on

the

front

panel.

Speakers

should

have

impedances

between

4

and

16

ohms,

but

when

the

two

speaker

sets

are

to

be

used

at

the

same

time,

connect

only

speakers

with

impedances

between

8

ohms

and

16

ohms.

Use

speakers

rated

to

take

the

full

60

watts

of

output

power,

or

set

the

volume

control

so

that

the

rated

maximum

speaker

input

power

is

not

exceeded.

Volume

level

should

be

reduced

immediately

whenever

there

is

increased

distortion

or

a

sense

of

strain

which

indicates

that

the

speakers

are

being

overloaded.

SPEAKER

CONNECTIONS

+

®

-

-

©

+

V-

"

_

J

Making

the

Speaker

Connections

1.

S

trip

%"

of

insulation

from

the

speaker

cable

and

twist

the

stray

ends

together.

If

possible

solder

the

ends.

Push

the

lever

beneath

the

terminal

as

shown

in

the

diagram,

and

aligning

the

inner

and

outer

terminal

holes.

Then

fully

insert

the

stripped

wire.

Release

the

lever,

and

the

wire

end

will

be

firmly

clamped.

2.

Use

the

upper

(A)

terminals

first.

Be

careful

that

the

terminals

identified

by

the

+

and

—

signs

above

them

are

connected

with

the

corresponding

+

and

—

terminals

on

the

speakers.

A

mistake

will

result

in

poor

bass

response

and

ill-defined

stereo

image.

Also

be

sure

to

connect

the

left-hand

speaker

to

the

L

speaker

terminals,

and

the

right-hand

to

the

R

terminals.

3.

Repeat

this

with

the

B

terminals

if

other

speakers

are

to

be

connected.

In

ail

cases

make

sure

that

connections

are

fully

and

firmly

made,

or

you

may

not

be

able

to

get

any

sound

from

one

or

more

speakers.

®AC

OUTLETS

These

spare

AC

Outlets

are

provided

for

your

convenience

in

connecting

other

items

of

audio

equipment.

Only

the

left

outlet

is

controlled

by

the

CR-840

power

switch.

This

has

a

maximum

power

rating

of

200

watts,

and

should

be

used

for

items

such

as

turntable

units.

Do

not

connect

any

item

which

draws

more

than

200

watts.

The

other

outlets

are

not

affected

by

the

CR-840

power

switch,

and

any

items

connected

to

them

must

be

switched

on

and

off

by

their

own

power

switches.

Note

that

the

total

power

available

from

these

two

outlets

together

is

only

200

watts.

Use

them

for

such

items

as

your

tape

deck.

0C5IMD

(©round)

Terminal

The

ground

terminal

is

provided

for

grounding

turntable

units.

©INPUT

Terminals

These

are

the

terminals

which

are

selected

by

the

Input

Selector

switch

on

the

front

panel.

They

include

Phono

and

Aux

connections.

The

Aux

terminals

can

be

used

to

connect

an

external

tuner,

or

for

an

8-track

cartridge

tape

player,

etc.

§TAPE

PB

and

RECOLJT

Terminals

Two

tape

decks

can

be

attached

to

these

input

and

output

terminals.

Recording

can

be

made

on

both

tape

decks

at

the

same

time,

of

any

source

connected

to

the

CR-840,

by

setting

the

Recout

selector

switch

on

the

front

panel

to

the

appropri¬

ate

position.

Tapes

can

be

dubbed

from

one

deck

to

the

other

in

either

direction,

and

recording

can

proceed

while

any

other

source

selected

by

the

Input

selector

is

being

auditioned.

@ADAPTOH

Terminals

When

connecting

a

Graphic

Equalizer,

Dolby

Unit

or

any

other

audio

equipment

to

the

Adaptor

terminals

connect

its

output

terminal

to

the

FROM

terminals

of

CR-840

and

its

input

terminal

to

the

TO

terminals

of

the

CR-840.

©AC

Electrical

Power

(Lane

Plug

the

CR-840

power

cord

into

a

main

power

supply

wall

outlet

socket,

and

make

sure

the

line

is

not

likely

to

be

tripped

over.

The

T-type

antenna

provided

with

yourCR-840

is

adequate

only

in

high

signal

strength

areas

and

under

favorable

conditions.

In

other

cases,

an

external

multi-element

FM

antenna

is

needed.

If

you

cannot

obtain

satisfactory

reception

with

the

T-type

antenna,

this

is

an

indication

that

you

need

an

external

FM

antenna.

To

ensure

the

very

best

results,

a

motor-driven

antenna

assembly

with

remote

control

of

its

orientation

is

ideal,

but

the

CR-840

has

sufficient

sensitivity

to

operate

well

with

a

fixed

antenna.

The

external

antenna

should

perferably

be

located

fairly

close

to

the

CR-840,

and

mounted

as

high

as

conveniently

possible.

Try

various

antenna

orientations,

either

pointing

towards

the

weakest

station

you

intend

to

receive

or

away

from

the

major

source

of

interference

(preferably

both,

although

some

compromise

is

usually

necessary

in

most

locations).

If

the

antenna

is

intended

for

use

with

shielded

coaxial

cable

(which

reduces

losses

and

interference)

use

the

7512

UNBAL

terminals

on

the

rear

panel

of

the

CR-840,

and

connect

the

cable

as

shown.

Antennas

intended

for

use

with

the

30012

BAL

terminals

on

the

rear

panel

(which

use

feeder

wire

similar

to

that

of

the

internal

antenna

provided)

can

also

be

used

with

coaxial

cable

if

a

matching

transformer

is

attached

to

the

antenna.

The

use

of

coaxial

cable

is

advisable

where

the

antenna

must

be

located

some

distance

from

the

CR-840,

or

where

interference

from

automobile

ignition,

etc.,

is

troublesome.

Attaching

the

coaxial

cable

to

the

accessory

plug

(21

Net

wire

holder

(

1

)

Plug

section

Inserting

the

core

(1)

Remove

the

outer

cover¬

ing

of

the

coaxial

cable

up

to

about

23

mm

from

its

tip,

and

then

slip

the

plug

fastener

over

the

coaxial

cable.

(2)

Insert

the

coaxial

cable

core

into

the

hole

special¬

ly

prepared

for

the

core

on

the

plug.

Insert

the

net

wire

holder.

(3)

Finally,

screw

in

the

plug

fastener.

Fig.

1

FM

BROADCAST

RECEPTION

1.

Set

the

INPUT

SELECTOR

to

TUNER.

2.

Set

the

TUNER

push-button

to

FM.

3.

Check

that

the

FM

indicator

LEDs

light

at

the

right-hand

side

of

the

dial.

4.

All

switches

and

knobs

should

be

as

shown

in

the

front-panel

diagram.

5.

Tune

for

maximum

signal

strength

on

the

SIGNAL

QUALITY

meter,

ignoring

any

oscilla¬

tions

of

the

indicating

pointer

position.

6.

Now

tune

to

bring

the

FM

TUNING

meter

pointer

to

its

exact

center.

This

is

the

optimum

tuning

position:

set

it

carefully.

7.

Check

that

the

FM

stereo

indicating

LED

lights

if

you

intend

listening

to

a

stereo

rather

than

a

monaural

broadcast.

When

connecting

the

coaxial

cable

to

the

75£2

UNBAL

connector

which

is

located

on

the

rear

panel

of

the

CR-840,

first

attach

the

cable

to

the

accessory

plug

as

shown

in

the

figure,

and

then

connect.

lO