Denon DRA-25 Manuale utente

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D

F

N

O

N

Hi-Fi

AM-FM

Stereo

Receiver

MODEL

DRA=-25/25L

AM-FM

STEREO

RECEIVER

DRA-25L

CONTENTS

PRECAUTIONS

FOR

INSTALLATION

ADVICE

FOR

USE

SPECIFICATIONS

NAME

OF

EACH

PART

CONNECTION

ANTENNA

INSTALLATION

REMOVAL

OF

EACH

SECTION

METHOD

OF

ADJUSTMENTS

CONNECTION

DIAGRAM

OF

MEASURING

INSTRUMENTS

SEMICONDUCTORS

DRA25

BLOCK

DIAGRAM

PRINTED

WIRING

BOARD

PATTERNS

AND

PARTS

LIST

PRINTED

WIRING

BOARD

EXPLODED

VIEW

OF

CHASSIS

AND

CABINET

&

PARTS

LIST

EXPLODED

VIEW

OF

CHASSIS

AND

CABINET

WIRING

DIAGRAM

SCHEMATIC

DIAGRAM

NIPPON

COLUMBIA

Co.

LTD.

MDRA-25/25St

PRECAUTIONS

FOR

INSTALLATION

DRA-25/25L

uses

a

newly

developed

heat

emitting

unit

by

employing

heat

pipes.

Since

the

heat

pipes

contain

a

coolant,

the

DRA-25/25L

must

be

set

level

or

the

desired

heat

emitting

effect

cannot

be

achieved.

Always

instal!

this

unit

horizontally.

ADVICE

FOR

USE

e

Do

not

place

the

set

in

direct

sunlight,

in

hot

areas

such

as

near

heating

equipment,

with

high

humidity

or

dust

levels.

This

may

cause

damage

to

the

unit.

Check

that

all

parts

are

connected

correctly

before

turning

on

the

power

source.

When

user

is

absent

for

jong

periods,

be

sure

to

remove

plug

from

wall

socket.

Do

not

use

insecticide,

benzene

or

thinner

near

the

unit,

or

the

cabinet

color

will

fade.

Avoid

using

polish:

use

a

soft

cloth

(e.g.

silicon

cloth),

ciligy

vue

wry,

‘4

Z

It

is

not

recommended

to

place

players,

decks

and

other

objects

on

the

DRA-25

or

DRA-25L

so

that

the

vents

are

blocked,

This

will

cause

internal

temperature

rise

and

equipment

failure.

Do

not

use

the

DRA-25

or

DRA-25L

in

a

closed

cabinet

or

container.

This

will

cause

internal

temperature

rise

abnormally.

For

United

Kingdom

model

only.

WARNING:

As

the

colours

of

the

wires

in

the

mains

lead

of

this

appliance

may

not

correspond

with

the

coloured

markings

identifying

the

terminals

in

your

plug

proceed

as

follows:

The

wire

which

is

coloured

blue

must

be

connected

to

the

terminal

which

is

marked

with

the

letter

N

or

coloured

black.

The

wire

which

is

coloured

brown

must

be

connected

to

the

terminal

which

is

marked

with

the

fetter

L

or

coloured

red.

The

wire

which

is

coloured

BROWN

must

be

connected

to

the

terminal

which

is

marked

with

the

letter

L

or

coloured

RED.

IMPORTANT

The

wires

in

this

mains

lead

are

coloured

in

accord-

ance

with

the

following

code:

Blue:

Neutral

Brown:

Live

SPECIFICATIONS

AMPLIFIER

SECTION

Rated

Output

Power:

Power

Bandwidth

(IHF):

Total

Harmonic

Distortion

{20

Hz

to

20

kHz):

Frequency

Responses:

input

Sensithvity

and

Impedance:

Maximum

Input

Level

(at

1

kHz):

Signal

to

Noise

Ratio

{IHF-A):

Tone

Controls:

Loudness,

Control

Effect:

3OW

+

30W

per

channel

minimum

RAMS,

both

channels

driven

at

8

ohms

from

20

Hz

~

20

kHz

no

more

then

0.05%

total

harmonic

distortion

45W

+

45W

per

channel

minimum

RMS,

both

channels

driven

at

4ohms

from

1

kHz

DIN

no

more

than

1%

total

harmonic

distortion

10

Hz

~

40

kHz

(T.H.D.

0.1%

both

ch,

driven

at

8

ohms)

-3

dB

power

into

8

ohms

0.04%

PHONO

RIAA

Standard

Curve

(Recording

Output)

MM

20

Hz

~

20

kHz

+

0.5

dB

20

Hz

~

50

kHz

+

1.5

dB

PHONO

MM

2.5mV_

47k

ohms

AUX,

TAPE,

CD

150mV

33

k

ohms

PHONO

MM

150

mV

PHONO

MM

78

dB

at

5.0

mV

input

AUX,

TAPE,

CD

95

dB

at

150

mV

input

BASS

+10

dB

at

100

Hz

TREBLE

+10

dB

at

10

kHz

VARIABLE

LOUDNESS

10

posi-

tions,

50

Hz/10

kHz,

+10

dB/+5

dB

TUNER

SECTION

LEM)

(note:

#V

at

75

ohms,

0

dBf

=

1

x

40°!FW)

Recelving

Range:

87.5

~

108

MHz

Usable

Sensitivity:

0.9

pV

(10.3

dBF)

S/N

50

dB

Quieting

Sensitivity:

Signal

to

Noise

Ratio

(IHF-A):

Tota!

Harmonic

Distortion

{at

1

kHz):

Capture

Ratio:

image

Rejection:

AM

Suppression:

Selectivity

(+300

kHz):

Frequency

Response:

Stereo

Separation

(at

1

kHz):

(mw)

Recsiving

Range:

Usable

Sensitivity:

Signal

to

Noise

Ratio:

[LW]

(DRA-251

only)

Receiving

Range:

Usable

Sansitivity:

GENERAL

Power

Supply:

Power

Consumption:

Dimensions:

Weight:

a

es

DRA-25/25L

ma

MONO

=

1.6

#V

(15.3

dBf)

STEREO

23

pV

(38.5

dBf)

MONO

82¢B

STEREO

78

dB

MONO

0.2%

STEREO

0.4%

1.5

dB

70

dB

50

dB

60

dB

30

Hz

~

18

kHz

70-2

dB

40

dB

522

~

1611

kHz

18

pV

53

dB

153

~

360

kHz

30

pV

AC

220

V

50

Hz

{for

Europe)

AC

240

V

50

Hz

(for

U.K,

&

Australia)

120

W

434

mm

(17-3/32")

W

x

112mm

(4-13/32"")

H

x

278

mm

(10-15/16")

D

5.5

kg

(12

Ibs

2

0z)

Design

and

specifications

are

subject

to

change

without

prior

notice.

NOTE:

The

following

codes

correspond

to

the

appropriate

models.

E2

for

Europe,

EA

for

Australia

and

EK

for

U.K.

This

Service

Manual

is

prepared

based

on

E2

Black

Version.

mg

ORA-25/25L

eaaeeeeerereereeereeeeeeee

eee

rearrange

SE

tn}

DRA-25/25L

m

NAME

OF

EACH

PART

FRONT

PANEL

BACK

PANEL

DENON

mec

sso

comonnt

snse

srenec

mech

vee

T2140

We

at

SHEAAEE

SYSTEMS

e

le

fi}

TR

\

WARRING

Tp

eapace

Tee

sign

oF

rE

ot

cLecTAIG

ba

ft

Fo

SAN

Om

ANT

NSE

IWS

APA

LiaNCE

ml

Hl

Ay

=e

AN

stant

WANING

=

Seeca

MAZAND

08

wat

PER

pt

AVIS:

seat

ME

OAC

CLéCTIngUE

—

zy;

i

TB

BS

8%.

©

1B

ue

It

OID

sruato

emo

AIO

Mam

see

a)

a

per

es

|

|

{DRA-25)

DISPLAY

cwmwi

CI

Fmt

UJ

0

FRONT

PANEL

POWER

(Power

Switch)

PHONES

(Headphones

Jack)

SPEAKERS

(Speaker

Select

Switch)

(DRA-25

only)

BASS

(Bass

Control)

TREBLE

(Treble

Control)

VARIABLE

LOUDNESS

(Loudness

Control)

BALANCE

(Balance

Control)

INPUT

SELECTOR

(Sound

Input

Select

Knob)

TAPE

MONITOR

(TAPE

Monitor

Switch)

CD

DIRECT

(CD

Direct

Switch)

QOOOWOOSQOOO

DISPLAY

SIGNAL

(Signal

Strength

Indicator)

STEREO/MONO

(Stereo/Mono

Indicator)

TUNING

MODE

(AUTO/MANUAL)

SHIFT

(Shift

Indicator)

a

ee

@QQC@OOQOOO

QO®)

VOLUME

(Volume

Control)

TUNING

MODE

(Tuning

Mode

Button)

FM

MODE

(FM

Mode

Button)

BAND

SELECT

(Band

Selector

Button)

TUNING

(Tuning

Buttons)

SHIFT

(Shift

Button)

MEMORY

(Memory

Button)

PRESET

CHANNEL

1

~

16

(Station

Presetting

Buttons)

MEMORY

(Memory

Indicator)

CHANNEL

FREQUENCY

DISPLAY

(Frequency

Indicator)

(DRA-25)

or

{DRA-25L)

)

BACK

PANEL

FM

ANT

(FM

Antenna

Terminals)

AM

ANT

{AM

Antenna

Terminats)

GND

(Grounding

Terminal)

AM

LOOP

ANT

(AM

Loop

Antenna)

PHONO

(Phono

Input

Terminals)

QOQOOO

ce

hersraraes

ARMING

sance

nuzans

0

m42

DCR

AVIS:

miStEL

OC

COG

CLECTATENE

ms

Wot

WARMING

:

ro

acouet

rae

esa

af

fiat

on

CeCcTING

WO

AAT

ERPESE

TIS:

APPLLANCE

Ta

tain

ge

wacsTaRe,

srg

srs

=

+

COLO

CD/AUX

TAPE

(Audio

Playback

and

Recording

Terminals)

SPEAKER SYSTEMS

(Speaker

Terminals)

AC

CORD

(Power

Cord)

mDRA-25/25L

CONNECTION

(This

is

a

figure

of

the

DRA-25L)

SPEAKER

(RIGHT)

@o

®

@

TURN

TABLE

OnE

+

De:

AUDIO

PIN

CORD

SPEAKER

(LEFT)

TAPE

DECK

BG)

REC

G)

&

©

©

AOL

LINE

OUT

CD

PLAYER

or

OTHER

AUDIO

EQUIPMENT

SPEAKER

CONNECTION

Confirm

polarity

(+,

—)

and

left

and

right

channels

(L,

R).

Connect

the

speaker

pairs

to

the

SPEAKER

terminals

A

or

B

on

the

back

panel.

Connections

must

be

made

with

power

cord

disconnected.

<

1.

Peel

off

the

sheathing

from

”

the

end

of

the

cord.

|

aw

2.

Twist

the

wire

strands.

i?

3.

Loosen

the

speaker

terminal,

insert

the

wire

Jead

portion

of

the

code,

and

then

tighten

the

terminal.

>

@

i

|

ANTENNA

INSTALLATION

©

FM

ANTENNA

The

accessory

T-type

indoor

antenna

(300

ohms)

can

be

used

inside

wooden

houses

for

local

FM

stations

and

strong

signals.

Orient

the

T-shaped

part

for

optimum

reception

and

mount

the

antenna

on

the

wall

or

ceiling.

(FM

indoor

antennas

may

not

consistently

ensure

stable

reception,

due

to

environment

changes.

In

such

cases

use

an

FM

indoor

antenna

temporarily

until

an

outdoor

antenna

is

installed.)

75

ohms

coaxial

cable

(3C-2V,

5C-2V)

is

preferable

to

obtain

better

performance

of

the

tuner.

(To

use

of

a

300

ohms

FM

outdoor

antenna,

connect

to

the

300

ohms

terminals.)

AM

ANTENNA

Attach

the

accessory

AM

loop

antenna

to

the

antenna

holder

on

the

back

panel.

Connect

the

leads

to

AM

and

GND

terminal.

Use

this

terminal

also

for

an

outdoor

antenna.

Orient

the

loop

antenna

horizontally

to

obtain

optimum

reception.

Where

broadcast

stations

are

distant

and

only

weak

signals

are

received,

or

where

signals

are

blocked

by

obstacles,

instal!

an

AM

outdoor

antenna.

GROUNDING

If

there

is

reception

noise,

use

of

grounding

wire

is

recommended.

Connect

a

thick

insulated

wire

to

the

“GND”

terminal,

and

attach

the

unconnected

bare

end

to

a

metal

water

pipe,

grounding

rod,

or

grounded

copper

plate.

*

Never

connect

the

grounding

wire

to

a

gas

pipe.

This

could

cause

fire

or

explosion.

7Sohm

COAXIAL

CABLE

ES

>

ANTENNA

{

PUSH

ADAPTER

FM

OUTDOOR

ANTENNA

Put

the

core

wire

into

the

900

of

the

terminal

Note:

«@

Two

FM

antennas

should

not

be

connected

simultaneously.

©

Even

if

an

external

AM

antenna

is

used,

the

AM

loop

antenna

should

not

be

disconnected.

e@

AM

loop

antenna

lead

terminals

do

not

touch

the

metal

part

of

the

back

panel.

ORA-25/25L.

mt

sg

ORA-25/25t

REMOVAL

OF

EACH

SECTION

1.

Top

Cover

1)

Unfasten

the

7

screws,

2)

Detach

the

top

cover

by

means

of

lifting

it

up-

ward,

2.

Front

Panel

1)

Pull

out

the

knobs,

(Main

volume

control

knob

x

1;

input

selector

knob

x

1;

tone,

balance,

etc.

x

4.)

2}

Remove

the

4

screws

from

the

bottom.

3)

Push

downward

the

4

claws

on

the

top

of

inner

panel

to

release

catching

of

front

panel,

then

pull

the

front

panel

frontward

and

detach.

Fig.

4

Front

Panel

to

KA

inner

Panel

oe

ae

Push

the

4

claws

on

the

top

and

|

pull

the

front

panel

frontward,

Puil

out

the

knob,

&

3x10CBTS(P)x4

3.

PCB

1)

Remove

the

power

knob.

2)

Unfasten

the

4

screws.

(Inner

panel

x

2;

power

switch

x

2.)

3)

Remove

the

5

screws

on

the

back

panel.

4)

Remove

the

2

screws

securing

the

heat

pipe

fin.

5)

Detach

the

AC

cord

bushing.

6)

Remove

the

3

heads

of

PCB

holder

and

pull

the

holder

upward

to

detach.

Fig.

5

i

re

Back

Panet

PCB

Heat

Pipe

Fin

3x6CBTS(8).8

3x8CBTS(S)x2

Upper

side

of

Securing

Screw

x2

POWER

SWITCH.

t

P

Back

Panel

!

a

3x6CBTS(S)-Bx3

|

Detached

condition

3x8CBTS(S)x4

:

Remove

PCB

hoider.

"

{3

portions.)

Fig.

6

—~8-

a

a

a

I

TE

ES

CA

A-P

5/25.

me

4,

Inner

Panel

1)

Take

out

the

speed

nut

of

headphone

jack.

2)

Pull

out

the

speaker

selector

switch

knob

and

remove

the

1

screw

fixing

the

switch.

(For

EK

and

LE2

versions,

disregard

this

step.)

3}

Unfasten

the

1

screw

holding

the

tone

volume

controls.

4)

Remove

the

screw

tightening

the

input

selector.

5)

Remove

the

nut

and

washer

securing

the

main

volume

control.

6)

Pull

frontward

the

inner

pane!

to

detach.

No

connection

in

either

type

of

both

LKEK

and

LKE2,

5.

FLD,

Tact

Switch

PCBs

Remove

the

push-rivet

holding

the

to

remove

each

PCB.

respective

PCB

Speaker

Selector

IS

-

Switch

Speed

nut

of

headphone

jack

a

Pa

2

oa

<

N

N

“

~N

-

TONE

Vol,

Nut and

Washer

of

Main

Volume

Control.

3x8CBTS(S)x3

(DRA-25)

Input

3x8CBTS(S)x2

{DRA-25L)

Selector

Fig.

7

FLD

PCB

inner

Panel

TACT

SW

PCB

Fig.

8

wm

DRA-25/25:L

METHOD

OF

ADJUSTMENTS

SP

TERMINAL

TPt

TPS

E)

Gq

og

TPH

TPI2

La

IDLE

CURRENT

ADJUSTMENT

(Fig.

4)

1,

Keep

the unit

away

from

direct

wind

blown

by

an

air-conditioner

and

an

electric

fan,

and

keep

the

unit

under

normal

conditions.

Adjust

the

range

of

ambient

temperature

to

15

—

30°C.

2.

Set

the

following

switches

as

follows:

@

POWER

(power

switch)

to

off

e@

VOLUME

(VOLUME

CONTROL)

to

0()}

©

SPEAKERS

(speaker

terminal)

to

no

load

(speakers

disconnected)

3.

Remove

the

top

cover

and

connect

a

DC

digital

voltmeter

to

the

test

points

{between

the

positive

terminal

TP3

@

and

the

negative

terminal

TP1

©),

and

between

the

positive

TP4

@

and

the

negative

terminal

TP2

(©).

4.

(1)

Connect

the

power

source

cord

to

an

AC

outlet

and

turn

on

the

power

switch;

read

the

measured

value

after

3

minutes

or

when

the

measured

value

is

within

a

tolerance

6

mV

~

90

mV

(DC),

adjust

the

idling

current

manually

as

follows,

(2)

When

the

voltmeter

reads

3mV

(DC)

or

less

under

the

condition

of

item

(1},

disconnect

the

39

ohm

from

re-

sistance

R517

and

R518.

co

®

AC

OUTLETS...

For

U.S.A.,

Canada

and

Asia

models.

AC

outlets

are

used

for

connecting

amplifier

component

units,

such

as

tuner,

turntable,

tape

deck,

etc.

@

SWITCHED

(Capacity:

100

W):

This

outlet

is

turned

on/off

when

main

power

switch

is

turned

on/off.

®

UNSWITCHED

(Total

capacity:

250

W):

These

outlets

are

always

ON

whether

power

switch

is

on

or

off.

e@

LINE

VOLTAGE

(Voitage

select

switch)

...

For

Asia

model

only.

*

The

desired

voltage

may

be

set

with

the

VOLTAGE

SELECTOR

KNOB

on

the

back

panel

using

a

screw

driver.

*

Do

not

twist

the

VOLTAGE

SELECTOR

KNOB

with

excessive

force.

It

may

be

damaged.

‘eo

*

if

the

voltage

select

switch

does

not

turn

smoothly,

see

a

qualified

serviceman.

=40

=

CONNECTION

DIAGRAM

OF

MEASURING

INSTRUMENTS

e

FM

e

MW

OSCILLO|

[

AC

VOLT

SCOPE

«|,

METER

OSILLO

SCOPE

DISTORTION

METER

|

AC

VOLT

|

METER

7

(9KHz

FILTER

DRA-25/25Lm

STEREO

MODULATOR

[

FM

SSG

1

7

UY

TUNING

4

gts

METER

|

TP

TPI2

alll,

Ri28

TPil

TPI2

cobs

LOOP

ANTENNA

AM_IF

SWEEP

GENERATOR

OUT

FM/MPX

ALIGNEMENT

Alignment

Tuning

Output

Table

1

Adjust

Frequency

tern

Setting

{Input

Level

Type

Connect

to

Points

Remarks

Adjust

to

Tuning

Center

|’

98

MHz

60

dB

Center

Meter}

T.P.11,12

T-1

Function:

FM

Mode:

Auto

Center

of

Tuning

Meter

Distortion

{Mono}

98

MHz

60

dBu

Distortion

(Stereo)

Type

Frequency

Mi

SSS.

|

98

mz

Meso

|

98

MHz

FM

SSG

Stereo

(L)

60

dBu

Distortion

TAPE

REC

{L)

Meter

T-2

Function:

FM

Mode:

Auto

Minimum

Distortion

Modulation

Coupling

Antenna

None

Terminal

1

kHz

Antenna

100%

Terminal

Main:

1

kHz

L-ch

90%

Antenna

Pilot:

Terminal

10%

Distortion

Meter

TAPE

REC

(L)

IFT

on

Front

End

Function:

FM

Mode:

Auto

Minimum

Distortion

Noise

Center

&

Distortion

MW

ALIGNMENT

520

kHz

AM

SSG

520

kHz

Receiving

Band

Alignment

600

kHz

Tracking

Input

Level

is

not

over

to

Works

A.G.C.

Input

Level

is

not

over

to

Works

A.G.C,

Input

Level

is

not

over

to

Alignment

1400

kHz

600 kHz

AM

SSG

1400

kHz

|

AMSSG

153

kHz

Receiving

Band

153

kHz

Input

Level

is

not

over

to

Works

A.GC,

Input

Level

is

not

over

to

Works

A.G.C.

Works

A.G.C.

Terminal

Loop

Antenna

AM

Antenna

Loop

Antenna

Loop

Antenna

Audio

V.M.

Loop

Audio

Antenna

V.M.

Monitor-

scope

Electric

DC

Voltmeter

T3

T-12

-11

TC-1

Repeat

1,

2

and

3

to

obtain

minimum

distortion

and

same

time

indicating

of

center

meter

at

center

condition,

R128

GND

R208

GND

TAPE

REC

(L)

arene

fre

|

Table

2

Maximum

Poser

Height

and

Beasts

AM

hen

Wave

Form:

Curve

450 kHz

1.2V+20mV

Table

3

Maximum

Output

Maximum

Output

1.2V+100mV

{|

Function:

AM

Tracking

163

kHz

163

kHz

Alignment

Input

Level

is

not

over

to

Works

A.G.C.

Loop

Antenna

TAPE

REC

(L)

Maximum

Output

Function:

AM

330

kHz

330 kHz

Input

Level

is

not

over

to

Works

A.G.C.

Loop

Antenna

TAPE

REC

(L})

Maximum

Output

ree

.

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port

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TRANSISTORS

2SC461P

(C)

2SA1015

(GR)

(TYPE-2)

2S8C1841

(E,'F)

2SA970

(BL/GR)

(TYPE-2)

2SA1048

2SC1815

(BL)

(TYPE-2)

2SC2878

(A)

(B)

2SC2458

B

(Base)

C

{Collector}

B

(Base)

E

(Emitter)

C

(Collector)

E

(Emitter)

2SA1489

(0/Y)

2SK365

2SC3853

(O/Y)

S

(Source)

(Emitter)

G

(Gate)

(Collector)

D

(Drain)

(Base)

e

DIODES

18S270A

HZS7B-3.

HZS18-2

DSA1A2

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