Nippon DENON DR-M12HX Manuale utente

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DENON.

„=.

SERVICE

MANUAL

STEREO

CASSETTE

TAPE

DECK

MODEL

DR-M12HX/M14HX

DR-M14HX

NIPPON

COLUMBIA

CO.

LTD.

TABLE

OF

CONTENTS

FEATURES.

SPECIFICATIONS

BLOCK

DIAGRAM

.

LEVEL

DIAGRAM.

PART

NAMES

AND

FUNCTIONS.

DISASSEMBLY

INSTRUCTIONS

..

ADJUSTING

AND

CHECKING

THE

:

MECHANISM

SECTION

ADJUSTING

THE

ELECTRICAL

SECTIONS.

PARTS

LIST

OF

P.W.BOARD

я

2

PARTS

LIST

OF

EXPLODED

VIEW...

EXPLODED

VIEW

OF

CABINET

AND

CHASSIS

GROUP.......

PARTS

LIST

OF

VM151

MECHANISM

UNIT

. З

EXPLODED

VIEW

OF

VM151

MECHANISM

UNIT

WIRING

DIAGRAM

(DR-M12HX)

WIRING

DIAGRAM

(DR-M14HX)

SCHEMATIC

DIAGRAM

OF

AUDIO

UNIT

(DR-M12HX)

SCHEMATIC

DIAGRAM

OF

POWER

UNIT

(DR-M12HX)

SCHEMATIC

DIAGRAM

OF

AUDIO

UNIT

(DR-M14HX)

SCHEMATIC

DIAGRAM

OF

POWER

UNIT

(DR-M14HX)

.

P.W.BOARD

OF

20-1436

AUDIO

UNIT

..

P.W.BOARD

OF

2U-1437

AND

2U-1438

UNIT

SEMICONDUCTORS

ОЗЕ

ЕЕ

FEATURES

Ш

Computer

controlled

silent

mechanism

Ш

Non-slip

reel

drive

for

stabilizing

tape

tension

E

Dual

power

supply

Ш

High

performance

SF

В/Р

head

Ш

Dolby

HX

PRO

system

№

Dolby

В

&

С

noise

reduction

system

Ш

Manual

bias

adjustment

control

№

Large

fluorescent

display

panel

№

Computing

tape

counter

with

4-digit

readout

and

memory

stop

Ш

Music

search

system

W

Versatile

infrared

remote

control

(DR-M14HX

only)

SPECIFICATIONS

ө

Type.

.

Vertical

tape

loading

4-track

2-channel

stereo

cassette

tape

deck

@Heads.

.

.

Record/Playback

(SF

В/Р

head)

Erase

(Double

gap

ferrite

head)

М

Capstan

(DC

servo

motor)

х1

Reel

(DC

motor)

x1

Actuator

(DC

motor)

x

1

©

Таре

Speed

.

4.8

cm/sec.

•

Fast

forward,

rewind

time

.

Approx.

100

sec.

with

a

C-60

cassette

e

Recording

bias

..

Approx.

105

kHz

e

Overall

S/N

ratio...............

Dolby

C

NR

on...

more

than

72 dB

(CCIR/ARM)

(at

3%

THD

level)

e

Overall

frequency

response

....

25

~18,000

Hz

+3

dB

(at

—20

dB

METAL

tape)

©

Channel

separation.

‚

more

than

40

dB

(at

1

kHz)

©

Crosstalk.

.

more

than

65 dB

(at

1

kHz)

eWowś.flutter.................

0.045%

wrms,

+0.1%

w.

peak

©

Inputs

ОРАО

ИЗВЕ

tees

80

mV

(—

20

dBm)

input

level

at

maximum

Input

impedance:

50

Корт

unbalanced

e

Outputs

Пе

рот

E

620

mV

(—2

dB)

output

level

at

maximum

(with

47

kohm

load,

recorded

level

of

200

pwb/mm)

ћеадрћопе........./........

1.2

mW

output

level

at

maximum

(optimum

load

impedance

8

ohm

—1.2

kohm)

9

Accessories

.

„Parallel

pin

cord

х2

e

Power

supply

.

50

Hz/60

Hz

compatible,

voltage

is

shown

on

rating

label

e

Power

consumption

.

.18

W

e

Dimensions

аи

а

лг

дал

434

(W)

x115

(Н)

x286

(D)

mm

eWejght

2202025330

4.5

kg

Ш

Above

specifications

and

design

styling

are

subject

to

change

for

improvement.

Wi

Dolby

noise

reduction

апа

HX

PRO

headroom

extension

manufactured

under

license

from

Dolby

Labo-

ratories

Licensing

Corporation.

НХ

PRO

originated

by

Bang

and

Olufsen.

"Роїбу",

the

double-D

symbol

and

“HX

PRO”

are

trademarks

of

Dolby

Laboratories

Licensing

Corporation.

WARNING:

1.

Component

parts

Parts

marked

with

A

and/or

shading

in

this

service

manual

have

special

characteristics

important

to

safety.

Be

sure

to

use

the

specified

parts

for

replacement.

2.

Leakage

current

2

Before

returning

the

appliance

to

customer,

test

the

leakage

current

when

the

power

plug

is

connected.

Use

a

calibrated

(with

an

error

of

not

more

than

5%)

leakage

current

tester

and

measure

the

leakage

current

from

any

exposed

metal

to

the

earth

ground.

Reverse

the

power

plug

polarity

and

test

the

above

again.

Any

current

measured

MUST

NOT

EXCEED

0.5

milliamps.

Corrective

measure

must

be

taken

if

it

exceeds

the

limit.

BLOCK

DIAGRAM

7

шпон

оча

XH

ѕэмона

|

|

.—o—

WU

шл

по

3NI1

w

ану

3NOHd

аузн

58

dW

ŁOLHL

6

ILAW

{SApJJY

2045150021)

—O

1vL3W

©

3WOYHO

O

TYWHON

HOLIMS

HL

Iv

оз

озн

айу

15008

$0651

103135

З4У1

123136

8"021/6"04.

РОШ.

му»

93H

ва

ану

o3

эчт

7

138431

1NdLno

9I

W3LSAS

YN

A8700

змолол

ам!

аузн

d/H

9%

5

шол

ov

Ta

NI

МІ

змолол

30NV

Iva

w

|

LEVEL

DIAGRAI

PLAYBACK

SYSTEM

TCC-130

DOLBY

B-TYPE

400

Hz

200

nwb/m

DOLBY

NR

OUTPUT

HEAD

PHONE

PB EQ

AMP

SYSTEM

IC

LEVEL

AMP

(>

>

i

38]

موم󰾯

Рр

|

RA

E,

зо]

me—^[]

HEAD

PHONE

Маш

LINE

LY

(Reh)

LINE

OUT

(dB)

0

чо

4

LINE

OUT

ost

PHONE

OUT

-204

5

-30-]

-40-]

-504

-60-1

-то-|

RECORDING

SYSTEM

INPUT

FREQUENCY

400

Hz

BALANCE

INPUT

DOLBY

NR

ВЕСЕО

HX

VR

VR

SYSTEM

С

BOOST

AMP

PRO

us

sof

ses

је

p

«ер

ро

Ef

dB

(METAL)

——

-4.86B

(Cro)

-о

4

T

:468

(NORMAL)

-ao

了

EM

-so

了

-во

4

-то

4

[PART

NAMES

AND

FUNCTIONS

@

1.

POWER

switch

Controls

the

supply

of

AC

power

to

the

deck.

One

push

turns

the

deck

on,

a

second

push

turns

it

off.

The

deck

remains

in

a

stand-

by

(non-operative)

mode

for

approximately

4

seconds

after

it

is

switched

on

2.

EJECT

button

Press

this

button

to

eject

the

cassette.

When

the

deck

is

operating

(tape

is

running),

press

the

stop

(ІШ)

key

first

to

stop

the

tape

transport;

then

press

the

EJECT

button.

3.

COUNTER

RESET

button

Operation

of

the

button

resets

the

counter

to

all

zero.

4.

MEMORY

STOP

button

During

rewinding

operations,

the

tape

will

stop

at

the

"0000"

counter

point

automatically

when

this

button

is

pressed

in.

5.

DOLBY

NR

switches

The

left

Dolby

NR

switch

activates

(in)

or

deactivates

(out)

the

deck's

Dolby

nose

reduction

circuitry.

The

right

switch

selects

between

Dolby

B-Type

(out)

or

C-Type

NR

(in)

6.

MPX

FILTER

switch

The

MPX

FILTER

switch

should

be

used

to

prevent

interference

with

the

Dolby

NR

circuit

when

making

Dolby

NR

encoded

recordings

of

FM

stereo

programs.

When

making

Dolby

NR

encoded

recordings

from

any

program

source

other

than

FM

stereo,

leave

this

switch

in

the

“off”

(out)

position

7.

BIAS

FINE

control

(for

NORMAL,

CrO,

and

METAL

tape)

Adjust

the

bias

according

to

the

tape

characteristics.

Standard

biasing

is

obtained

at

the

center

click-stop

position.

8.

BALANCE

control

This

is

the

knob

to

adjust

the

recording

level

balance

between

the

left

and

right

channels.

Turn

it

counterclockwise

to

reduce

the

right

channel's

level

and

clockwise

to

reduce

the

left

chan-

nel's.

Usually,

put

the

knob

at

the

center

click

position.

9.

PHONES

jack

For

private

music

enjoyment

without

disturbing

others,

or

for

monitoring

a

recording,

a

set

of

headphones

may

be

plugged

in.

Impedance

should

be

from

8

to

1200

ohms.

10.

OUTPUT

LEVEL

control

This

control

adjusts

playback,

recording

monitor,

and

head-

phones

output

levels

for

the

both

channels

simultaneously

11.

INPUT

LEVEL

control

The

recording

input

level

is

adjusted

by

this

knob.

The

levels

in

the

left

and

right

channels

can

be

changed

simultaneously.

12.

Cassette

compartment

cover

If

this

compartment

cover

is

not

closed

completely,

the

deck's

transport

controls

will

remain

inoperative

13.

TAPE

COUNTER

A

4-digit

readout

indicates

the

present

tape

count

position.

17.

FILTER

indicator

This

indicator

light

is

interlocked

with

the

MPX

FILTER

switch.

(FILTER)

14.

FLUORESCENT

PEAK

METERS

0

These

meters

indicate

recording

or

playback

peak

levels

for

each

18.

TAPE

SELECT

indicator

channel.

This

indicator

light

is

interlocked

with

the

Auto

Tape

Select

fea-

15.

MEMORY

indicator

When

the

memory

switch

is

turned

on,

the

letters

of

be

displayed.

ture

which

automatically

adjusts

the

deck

to

the

type

of

tape

in

use.

МЕМО

|

will

(NORMAL!

[СгО,

|

or

|

METALI).

16.NR

SYSTEM

indicator

This

indicator

light

is

interlocked

with

the

Dolby

NR

switch

and

e

The

window

receives

commands

from

the

infrared

remote

informs

the

user

that

Dolby

NR

is

in

use

as

well

as

which

|B

Type.

19.

REMOTE

CONTROL

photosensitive

window

(DR-M14HX

only)

or

|C

control

unit.

20.

Tape

transport

controls

e

Operate

the

remote

control

unit

(RC-102)

directing

toward

the

photosensitive

window.

>

PLAY

PLAY

KEY

Press

to

playback

tape.

m

сто

STOP

KEY

Press

to

stop

tape

in

any

mode,

“

REW

KEY

Press

for

fast

rewind

>

FF

KEY

Press

for

fast

forward

tape

winding,

D

To

begin

recording,

press

the

RECORD

and

PLAY

keys

simultaneously.

If

only

the

|

e

нс

RECORD

KEY

RECORD

key

is

pressed,

the

deck

is

placed

in

the

REC

PAUSE

(record

standby)

mode.

Press

this

key

for

less

than

0.5

sec

if

you

want

to

change

from

the

recording

state

into

the

rec

pause

state.

When

this

key

is

pressed

for

more

than

1

sec

for

making

a

ІП

REC

PAUSE/MUTE

REC

PAUSE/MUTE

KEY

|

pon

recorded

part

between

two

melodies,

about

5

sec

of

non-recorded

part

can

eu-

tomatically

be

created.

Note:

ОВ-М14НХ

is

used

in

all

the

illustrations.

3

ОВ-М12НХ

has

no

Remote

Control

Photosensitive

Window

(9).

DISASSEMBLY

INSTRUCTIONS

|

Л,

(1)

(2)

(3)

(1)

2

(3)

(4)

(5)

(6)

(7)

How

to

Remove

the

Front

Panel

Unscrew

the

4

screws

112

from

both

sides

of

the

top

cover

31

and

take

off

the top

cover

by

pulling

it

up.

Press

the

eject

knob

23,

open

the

cassette

window

29

and

take

off

the

mechanism,

as

shown

in

the

diagram.

Note:

Be

careful

when

handling

the

cassette

window,

as

it

is

easily

scratched

The

front

panel

can

be

removed

by

unscrewing

the

3

upper

screws

(3x8

CFTS

(6)-2)

110

from

the

front

panel

26

and

loosening

the

4

hooks.

How

to

Remove

the

Mechanisms

Remove

the

top

cover

31

and

the

front

panel

26.

(Refer

to

section

1)

Unscrew

the

2

screws

(3x10

CBTS

(P)-Z)

104

holding

the

angle

14

and

the

mechanism

12

and

the

2

chassis

holding

screws

106

and

remove

the

angle.

Unscrew

the

2

mechanism

holding

screws

102

(3x8

CBTS

(P)-2)

Remove

the

connectors

with

lead

wires,

which

runs

from

the

mechanism

section,

from

the

audio

circuit

board.

ЗР

connector

CN5

6P

connector

СМА

7P

connector

CN3

ВР

connector

CN1

Note:

When

assembling,

check

to

make

sure

the

connec-

tors

are

inserted

correctly.

Pull

out

the

power

switch

level

22

from

the

power

switch

58.

Remove

the

eject

knob

23

The

mechanism

can

be

removed

by

holding

the

mechanism

and

pulling

up.

Note:

When

assembling,

do

so

after

checking

to

make

sure

the

2

stay

holes

on

the

lower

side

of

the

mechanism

unit

are

matched

with

the

chassis

pro-

trusions

(1)

(2)

(3)

(1)

(2)

(3)

How

to

Remove

the

Meter

Window

and

the

Color

Filter

Remove

top

cover

31

and

front

panel

26.

(Refer

to

Section

1)

Meter

window

21

can

be

removed

by

pulling

up.

Color

filter

20

can

be

removed

after

meter

window

21

is

re-

moved.

How

to

Remove

the

Input

Volume

Circuit

Board

Remove

the

top

cover

31

and

the

front

panel

26.

(Refer

to

section

1)

Remove

the

volume

knob

(A)

27

By

unscrewing

the

nut

holding

the

input

volume

57,

the

input

volume

circuit

board

can

be

removed.

4

`

(1)

(2)

D

(3)

(4)

(5)

6.

(1)

(2)

(3)

(4)

(5)

How

to

Remove

the

Front

Esc

Ass'y

Remove

the

top

cover

31

and

the

front

panel

26.

(Refer

to

section

1)

Remove

the

angle

14.

(Refer

to

section

2)

Remove

the

meter

window

21

and

the

color

filter

20.

(Refer

to

section

3)

Remove

the

input

volume

circuit

board.

(Refer

to

section

4)

Unscrew

the

nut

holding

the

headphone

jack

52.

Then

the

front

esc

ass'y

10

can

be

removed.

How

to

Remove

the

Meter

Circuit

Board

Remove

the

top

cover

31

and

the

front

panel

26.

(Refer

to

Section

1)

Remove

the

angle

14.

(Refer

to

section

2)

Remove

the

meter

window

21

and

the

color

filter

20.

(Refer

to

section

3)

Remove

the

front

escuchion

ass'y

10.

(Refer

to

section

5)

By

loosening

the

4

hooks

on

the

front

escuchion

ass'y

10

holding

the

meter

circuit

board

6-2,

it

can

be

removed.

p

Note:

When

replacing

the

tact

switch

54,

always

check

to

(2)

(3)

(4)

(5)

(6)

|

|

Ё

|

(1)

|

(7)

make

sure

that

it

is

not

floating

above

the

circuit

board.

If

it

is

floating,

the

switch

will

be

in

the

on

condition

when

the

setis

assembled.

,

(2)

х

=

ша

How

to

Remove

the

Audio

Circuit

Board

Remove

the

top

cover

31

and

the

front

panel

26.

(Refer

to

section

1)

Remove

the

angle

14.

(Refer

to

section

2)

Remove

the

front

escuchion

10.

Remove

the

meter

circuit

board

6-2.

(Refer

to

section

6)

Remove

the

connectors

from

the

audio

circuit

board

6-1.

Unscrew

the

4

bottom

cover

holding

screws

(3x8

CBTS

(P)-Z)

102

on

the

back

side

of

the

chassis

1

and

remove

the

bottom

cover

19.

By

loosening

the

2

hooks

on

the

chassis

holding

the

audio

circuit

board

6-1,

the

audio

circuit

board

can

be

removed.

(1)

(2)

(3)

(4)

Note:

Most

repairs

to

the

audio

circuit

board

can

be

per-

formed

by

removing

the

bottom

cover

on

the

chas-

sis.

Refer

to

the

above

procedure

only

when

neces-

sary.

When

reassembling,

follow

the

procedures

in

reverse

order;

however,

if

each

of

the

various

parts

are

not

assembled

properly

in

their

respective

posi-

tion,

the

set

cannot

be

assembled.

When

assem-

bling,

check

the

work

of

each

step

carefully.

How

to

Remove

the

Power

Supply

Circuit

Board

Remove

the

top

cover

31.

(Refer

to

section

1)

Remove

the

various

connectors

from

the

power

supply

cir-

cuit

board

5.

Unscrew

the

3

screws

(3x8

CBTS

(Р)-2)

102

holding

the

power

supply

circuit

board.

By

pulling

up

the

power

supply

circuit

board

5,

it

can

be

re-

moved.

ADJUSTING

AND

CHECKING

THE

MECHANISM

SECTION

1.

Replacing

the

Pinch

Roller

Arm

Ass'y

9

Before

replacing

the

pinch

roller,

clean

the

tape

contact

surface

of

the

pinch

roller

and

the

capstan

shaft.

Most

causes

of

poor

tape

transport

can

be

traced

to

dirty

pinch

roller

and

capstan

shaft.

The

pinch

roller

arm

ass'y

9

can

be

removed

by

removing

the

spring

8

and

the

slit

washer

111.

After

replacing,

run

а

padless

С-90

tape

to

check

for

tape

curls

at

the

tape

guide

section

of

the

head.

2.

Checking

the

Pressure

Force

of

the

Pinch

Roller

In

the

playback

mode,

hook

a

spring

weight

onto

the

bracket

at

the

center

of

the

pinch

roller.

After

separating

the

pinch

roller

from

the

capstan

shaft,

allow

the

pinch

roller

to

contact

the

caps-

tan

shaft

again.

Check

to

make

sure

the

spring

weight

reads

be-

tween

250

—

350

g

when

the

pinch

roller

starts

to

rotate.

If

it

is

not

within

the

normal

range,

replace

the

spring

8.

Capstan

shaft

Pinch

roller

一

|

r

250~

3509

3.

Replacing

the

Record/Playback

Head

23

(1)

How

to

remove

the R/P

HEAD.

1)

Remove

securing

screw

105

and

azimuth

adjusting

nut

110

from

the

record/playback

head.

2)

Remove

the

soldered

head

wire

and

disassemble

the

mechanical

unit

to

remove

the

record/playback

head.

(2)

How

to

assemble

the

R/P

HEAD.

Reverse

the

above

1

procedures

for

removing

the

R/P

HEAD.

“Solder

the

HEAD

WIRE

71

according

to

the

diagram.

4.

Adjusting

the

R/P

HEAD

23

Azimuth

adjustments

Playback

the

А-ВЕХ

TCC-153

test

tape.

Turn

the

azimuth

adjust-

ment

nut

and

adjust

so

that

A

of

the

resurge

wave

from

is

maxi-

mum

and

B

is

minimum.

*

After

the

adjustments,

apply

anaerobic

adhesive

on

the

posi-

tions

indicated

in

the

diagram.

Note:

Only

the

azimuth

adjustment

is

necessary;

no

height

ad-

justments

are

required.

PB

Amp

ыг,

А-ВЕХ

ТСС-153

Head

adjust

spacer

|

Z:

Anaerobic

adhesive

ell

B

Note:

Be

sure

to

mount

the

head

adjust

spacer.

5.

Replacing

the

ERASE

HEAD

24

(1)

Unscrew

the

erase

head

holding

screws

104,

105.

(2)

By

unsoldering

the

HEAD

WIRES

72

can

be

taken

off

the

mechanism

unit.

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