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DEMON

Component

SERVICE

MANUAL

STEREO

CASSETTE

TAPE

DECK

MODEL

DR-M33HX/DR-M44HX

DR-M44HX

NIPPON

COLUMBIA

CO..

LTD.

TABLE

OF

CONTENTS

MAIN

FEATURES..

^

SPECIFICATIONS.

3

PARTS

NAMES

AND

FUNCTIONS.-

..

4-5

BLOCK

DIAGRAM

.

6

LEVEL

DIAGRAM.

^

OUTLINE

OF

THE

MECHANISM

CONTROL

MICROCOMPUTER.

8

DISASSEMBLY

INSTRUCTIONS.

9

~

11

ADJUSTING

AND

CHECKING

THE

MECHANISM

SECTION.

11-14

ADJUSTING

THE

ELECTRICAL

SECTIONS..

14-17

PARTS

LIST

OF

P.W.

BOARD.

18-21

PARTS

LIST

OF

EXPLODED

VIEW

(DR-M33HX)

.

22

EXPLODED

VIEW

OF

CABINET

AND

CHASSIS

GROUP

(DR-M33HX)..

23

PARTS

LIST

OF

P.W.

BOARD,

ACCESSORIES

AND

PACKING

GROUP

.

24

PARTS

LIST

OF

MECHANISM

83

UNIT

(DR-M33HX)

.

24

EXPLODED

VIEW

OF

MECHANISM

83

UNIT

(DR-M33HX)

.

25

WIRING

DIAGRAM

(DR-M33HX)

.

26

SCHEMATIC

DIAGRAM

OF

HX

PRO

UNIT

(DR-M33HX).

27

P.W.

BOARD

OF

KU-5620

HX

PRO

UNIT

(DR-M33HX)

.

27

SCHEMATIC

DIAGRAM

OF

AUDIO

AMP

UNIT

(DR-M33HX).

28

P.W.

BOARD

OF

KU-5610

AUDIO

AMP

UNIT.

29

SCHEMATIC

DIAGRAM

OF

POWER

AND

LOGIC

UNIT

{DR-M33HX)

.

30

P.W.

BOARD

OF

KU-5211

POWER

AND

LOGIC

UNIT

.

31

P.W.

BOARD

OF

KU-5220

CONTROL

UNIT

AND

KU-5650

MECHANISM

UNIT.

31

SCHEMATIC

DIAGRAM

OF

FL

COUNTER

UNIT

{DR-M33HX).

32

P.W.

BOARD

OF

KU-5640

FL

COUNTER

UNIT...

33

EXPLODED

VIEW

OF

CABINET

AND

CHASSIS

GROUP

(DR-M44HX).

34

PARTS

LIST

OF

EXPLODED

VIEW

(DR-M44HX)

.

25

PARTS

LIST

OF

MECHANISM

53

UNIT

(DR-M44HX)

.

36

EXPLODED

VIEW

OF

MECHANISM

53

UNIT

(DR-M44HX)

.

37

WIRING

DIAGRAM

(DR-M44HX)

.

28

SCHEMATIC

DIAGRAM

OF

HX

PRO

UNIT

{DR-M44HX).

39

P.W.

BOARD

OF

KU-5621

HX

PRO

UNIT

....

SCHEMATIC

DIAGRM

OF

AUDIO

AMP

UNIT

(DR-M44HX)

.

40

P.W.

BOARD

OF

KU-5611

AUDIO

AMP

UNIT.

41

SCHEMATIC

DIAGRAM

OF

POWER

AND

LOGIC

UNIT

(DR-M44HX)

.

42

P.W.

BOARD

OF

KU-5212

POWER

AND

LOGIC

UNIT

.

43

P.W.

BOARD

OF

KU-5221

CONTROL

UNIT...

43

SCHEMATIC

DIAGRAM

OF

FL

COUNTER

UNIT

(DR-M44HX).

44

P.W.

BOARD

OF

KU-5641

FL

COUNTER

UNIT.

45

SCHEMATIC

DIAGRAM

OF

CTS

UNIT

(DR-M44HX).

46

P.W.

BOARD

OF

KU-0451

CTS

UNIT.

47

SCHEMATIC

DIAGRAM

OF

CAPSTAN

SERVO

UNIT

(DR-M44HX).

48

P.W.

BOARD

OF

KU-0445-2

CAPSTAN

SERVO

UNIT

.

48

MAIN

FEATURES

■

Computer-controlled

servo

technology

•

Direct

drive

closed-loop

dual-capstan

tape

transport

(DR-M44HX)

•

Closed-loop

dual-capstan

tape

transport

(DR-M33HX)

•

Silent,

soft-touch

controls

provide

maximum

ease-of-use.

•

Computer-controlled,

full-logic

tape

controls

enable

fool-proof

operation.

■

Three-head

design

utilizes

DENON's

new

SF

record/playback

combination

head

assembly.

■

Dolby

HX

PRO

head

room

extension

system

■

Computing

linear

counter

with

memory

stop.

■

Auto

tuning

system

provides

automatic

for

level

and

EQ.

(DR-M44HX)

■

Dolby-C

noise

reduction

systems

(Double

Dolby

System).

■

Extended

range,

dual-color

fluorescent

peak

meters

with

auto

peak

hold.

■

Auto

tape

selector.

■

Remote

control

connection

terminal.

■

High-grade

5-pole

DC

reel

drive

motor.

■

Bias

fine

adjustment

(DR-M33HX)

-

2

-

SPECIFICATIONS

Type

.

Heads

.

Motors

Tape

Speed.

Fast

forward,

rewind

time.

Recording

bias.

Ocerail

S/N

ratio

.

{at

3%

THD

level)

Overall

frequency

response.

Channel

separation.

Crosstalk.

Wow

&

flutter.

Inputs

Line.

Outputs

Line.

Headphone.

Accessories.

Power

supply.

Power

consumption

.

Dimensions.

Weight.

Vertical

tape

loading

4-track

2-channel

st

er-pw

f

3

;-rttr

tape

deck

SF

Record/Playback

combination

head

x

1

Erase

head

(Ferrite)

x

1

FG

Servo

Direct

Drive

motor

(for

capstan)

x

1

(DR-M44HX)

Electronic

servo

DC

motor

(for

capstan)

x

1

(DR-M33HX)

5-pole

DC

motor

(for

reel

winding

)

x

1

4.8

cm/sec.

Approx.

80

sec.

with

a

C-60

cassette

Approx.

105

KHz

Dolby

C

NR

on

...

75

dB

(CCIR/ARM)

25

~

20,000

Hz

±3dB

(at

-20

dB

METAL

TAPE)

more

than

40

dB

(at

1

KHz)

more

than

65

dB

(at

1

KHz)

0.035%

w.rms

(DR-M44HX)

0.04%w.rms

(PR-M33HX)

77.5

mV

(—20dB)

input

level

at

maximum

Input

impedance:

50

Kohm

unbalanced

775

mV

(0

dB)

output

level

at

maximum

(with

47

Kohm

load,

recorded

level

of

200

pwb/mm)

1.2

mW

output

level

at

maximum

(optimum

load

impedance

8

ohm

~

1.2

Kohm)

parallel

pin

cord

x

2

50/60

Hz

compatible,

voltage

is

shown

on

rating

label

25W

(DR-M44HX),

24W

(DR-M33HX)

434

(W)

X

115

(H)

X

286

(D)

mm

(DR-M33HX)

464

(W)

X

115

(H)

X

286

(D)

mm

(DR-M44HX)

5.6

kg

(DR-M33HX)

6.3

kg

(DR-M44HX)

•

Above

specification

and

design

styling

are

subject

to

change

without

notice

for

improvement.

Dolby

noise

reduction

and

HX

PRO

headroom

extension

manufactured

under

license

from

Dolby

Laboratories

Licensing

Corporation.

HX

PRO

originated

by

Bang

and

Olufsen.

"Dolby”,

the

double-

D

symbol,

and

"HX

PRO"

are

trademarks

of

Dolby

Laboratories

Licensing

Corporation.

WARNING:

1.

Component

parts

Parts

marked

with

^

and/or

shading

in

this

service

manual

have

special

characteristics

important

to

safety.

Besure

to

use

the

specified

parts

for

replacement.

2.

Leakage

current

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.

-

3

-

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

approxi¬

mately

4

seconds

after

it

is

switched

on.

2.

TIMER

switch

This

switch

is

provided

for

use

with

an

optional

audio

timer

for

unattended

recording

or

morning-alarm

play¬

back.

For

non-timer

operation,

this

switch

should

be

set

in

the

"off"

position.

3.

EJECT

button

Press

this

button

to

eject

the

cassette.

When

the

deck

is

operating

(tape

is

running),

press

the

stop

(

■

)

key

first

to

stop

the

tape

transport;

then

press

the

eject

button.

4.

CASSETTE

COMPARTMENT

COVER

If

this

compartment

cover

is

not

closed

completely,

the

deck's

transport

controls

will

remain

inoperative.

5.

LINEAR

TAPE

COUNTER

Tape-passage

is

indicated

digitally

in

minutes

and

seconds.

6.

DOLBY

NR

switches

The

left

Dolby

NR

switch

activates

(in)

or

deactivates

(out)

the

deck's

Dolby

noise

reduction

circuitry.

The

right

switch

selects

between

Dolby

B-Type

(out)

or

C-Type

NR

(in).

7.

MPX

FILTER

switch

The

MPX

FILTER

switch

should

be

used

to

prevent

inter¬

ference

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.

8.

MONITOR

switch

The

SOURCE

(in)

position

of

this

switch

allows

you

to

-

4

-

monitor

the

source

program

before

it

is

recorded.

The

TAPE

(OUT)

position

of

this

switch

is

used

for

tape

play¬

back

monitoring

or

simultaneous

monitoring

during

record¬

ing.

9.

FLUORESCENT

PEAK

METERS

These

meters

indicate

recording

or

playback

peak

levels

for

each

channel.

For

peak

levels

exceeding

—IdB,

the

Auto

Peak

Hold

Feature

holds

the

peak

level

reading

for

approximately

1.5

seconds.

10.

TAPE

SELECT

indicator

This

indicator

light

is

interlocked

with

the

Auto

Tape

Select

feature

which

automatically

adjusts

the

deck

to

the

type

of

tape

in

use.

(NORMAL,

CrO^

,

or

METAL).

11.

OUTPUT

LEVEL

control

This

control

adjusts

playback,

recording

monitor,

and

headphones

output

levels

for

the

both

channels

simultane¬

ously.

12.

NR

SYSTEM

indicator

This

indicator

light

is

interlocked

with

the

Dolby

NR

switch

and

informs

the

user

that

Dolby

NR

is

in

use

as

well

as

which

(B

or

C)

Type.

13.

MONITOR

indicator

This

indicator

light

is

interlocked

with

the

MONITOR

switch

to

inform

the

use

of

the

selected

monitoring

source

-TAPE

or

SOURCE.

14.

INPUT

LEVEL

controls

These

controls

are

used

to

adjust

recording

levels

for

each

channel.

The

front

control

is

for

the

left

channel;

the

rear

control

for

the

right

chanriejj*.^

-

15.

PHONES

jack

For

private

music

enjoyment

without

disturbing

others,

or

for

monitoring

a

recording,

a

set

of

headphones

may

be

plugged

in.

Impedance

is

from

8

to

1200

ohms.

16.

RESET

button

Operation

of

the

button

resets

the

counter

to

all

zero.

17.

MEMORY

STOP

button

During

rewinding

operations,

the

tape

will

stop

at

the

“0000"

counter

point

automatically

when

this

button

is

pressed

in.

18.

AUTO

TUNING

system

(DR-M44HX

only)

By

pushing

this

button,

the

deck

automatically

adjusts

itself

for

the

optimal

recording

characteristics

of

the

tape

that

is

being

used.

19.

Bias

Fine

Adjustment

(for

NORMAL

and

CrOa

tape)

{DR-M33HX

only)

Adjust

the

bias

according

to

the

tape

characteristics.

Standard

biasing

is

obtained

at

the

center

click-stop

posi¬

tion.

20.

T

ape

Transport

Controls

►

►

PLAY

KEY

Press

to

playback

tape.

■

■

STOP

KEY

Press

to

stop

tape

in

any

mode.

◄

◄

REW

KEY

Press

for

fast

rewind.

►

►

►

►

FF

KEY

Press

for

fast

forward

tape

winding.

•

REC

•

RECORD

KEY

To

begin

recording,

press

the

RECORD

and

PLAY

keys

simultaneously.

If

only

the

RECORD

key

is

pressed,

the

deck

is

placed

in

the

REC

PAUSE

(record

standby)

mode.

II

PAUSE

MUTE

II

PAUSE/MUTE

KEY

The

PAUSE

key

causes

the

tape

to

stop

momen¬

tarily

during

recording

or

to

mute

the

recording

input

to

create

blank

(non-recorded)

portions

on

the

tape

21.

H

X

PRO

indicator

This

indicator

lights

when

the

power

is

on

to

indicate

provision

of

the

HX-PRO

headroom

extension

system.

-

5

-

•

Outline

of

the

Mechanism

Control

Microcom¬

puter

The

function

of

the

microcomputer,

which

is

applied

to

the

uni-directional

transport

cam

drive

control

cassette

deck

mechanism,

will

receive

an

outside

signal

from

the

opera¬

tion

switch

(operations

such

as

PLAY,

REC,

STOP,

FF)

during

the

recognition

of

the

current

condition

or

from

the

surrounding

circuits

of

the

microcomputer

(automatic

tun¬

ing,

linear

counter,

cam

encoder,

reel

pulse,

etc.)

and

sends

the

appropriate

control

signal.

To

the

mechanism:

rotational

direction

of

the

reel

motor,

speed,

stop,

rotational

direction

of

the

cam

motor,

stop.

To

the

linear

counter:

makes

an

output

of

the

mechanism

run

mode

command

(REW,

FF,

PAUSE,

PLAY).

To

the

automatic

tuning:

REC,

P/B,

LINE

mute

signal

commands.

Makes

an

output

of

the

BIAS

ON/OFF

com¬

mand

(CUE

command).

To

the

display:

REC,

PAUSE

(REC

MUTE

during

flash).

In

addition,

the

following

points

are

taken

into

consider¬

ation.

(1)

Stable

and

accurate

cam

rotation

position

control

is

required

since

a

cam

drive

method

is

employed

to

make

the

mechanism

silent.

Accurate

rotation

position

control

is

performed

by

using

a

cam

drive

with

a

rotary

encoder

detected

digital

feedback

servo.

(2)

Since

the

leading

time

of

the

cam

drive

is

slower

when

compared

to

that

of

the

plunger

method,

problems

will

arise

when

attempting

record/playback

or

stop

at

the

designated

tape

position

from

FF

or

REW,

since

tape

overrun

occurs.

This

is

especially

important

when

controlling

the

recording

from

the

position

where

the

automatic

tuning

was

completed.

(Erasing

the

previous

music

when

making

recordings

after

the

automatic

tuning

is

completed

must

be

prevented.)

For

this,

the

tape

cuing

is

corrected

after

the

automatic

tuning

is

completed

to

control

the

tape

position

accurately.

(3)

Power

outage

measures.

When

the

power

supply

is

cut

off,

the

cam

of

the

mechanism

shifts

to

STOP.

(4)

Overload

measure

s

of

the

cam

If

the

cam

stops

an

overload

for

any

reason

and

cannot

shift

to

the

target

position

within

4

seconds,

it

is

immediately

shifted

to

STOP.

If

this

cannot

be

shift¬

ed

within

4

seconds,

the

microcomputer

will

stop

all

controls

ai'd

stop

the

motor

to

prevent

a

breakdown.

•

Auto

Tuning

(CTS)

This

tuning

system

automatically

sets

the

equalizer

and

recording

sensitivity,

both

of

which

are

important

to

maxi¬

mizing

the

performance

of

various

tapes

and

to

make

high

quality

recordings.

The

tuning

time

is

only

6

seconds;

recording

chances

are

not

missed.

When

the

cassette

is

loaded,

the

auto

tape

selector

sets

the

deck

to

the

standard

optimum

condition.

Strictly

speaking,

however,

the

record¬

ing

sensitivity

and

frequency

characteristics

of

the

tapes

vary,

depending

on

its

type.

The

auto

tuning

system

allows

the

maximum

perform¬

ance

of

the

tape

to

be

heard

and

at

the

same

time

ideally

corrects

the

frequency

characteristics

to

a

flat

and

wide

range

characteristic.

-

8

-

DISASSEMBLY

INSTRUCTIONS

1

.

(

1

)

(

2

)

(3)

(4)

How

to

Remove

the

Front

Panel

Unscrew

the

4

screws

309

from

both

sides

of

the

top

cover

240

and

take

off

the

top

cover

by

pulling

it

up.

Press

the

eject

knob

231,

open

the

cassette

window

239

and

take

off

the

mechanism,

as

shown

in

the

dia¬

gram.

Note:

Be

careful

when

handling

the

cassette

window,

as

it

is

easily

scratched.)

Remove

the

connector

(5P)

with

lead

wires,

which

runs

from

the

timer

switch

234

to

the

rear

of

the

logic

cir¬

cuit

board

202,

from

the

logic

circuit

board.

The

front

panel

can

be

removed

by

unscrewing

the

3

upper

screws

(3x8

CFTS

S

tight)

307

from

the

front

panel

233

and

the

3

lower

screws

(3x8

CBTS

P

tight)

308.

(5)

(

6

)

(7)

Pull

out

the

power

switch

lever

230

from

the

power

switch

259.

Remove

the

eject

knob

231.

The

mechanism

cair

!j?rembved

by

holding

the

mecha¬

nism

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

protrusions.

Removal

of

Front

Escutchion,

Meter

Window,

and

Control

Button

Remove

Top

Cover

(240)

and

Front

Panel

(233).

(Refer

to

Section

1)

Unscrew

the

3

screws

(3x8

CBTS

P

Tight)

(301)

which

secure

Front

Escutchion.

Front

Escutchion

(221)

is

fixed

to

the

Front

Chassis

(206)

by

3

pins;

located

at

right,

left,

and

below,

so

that

Front

Escutchion

may

be

removed

when

these

pins

are

removed

in

order

of

right,

below

and

left

as

indicated

by

arrow.

2.

How

to

Remove

the

Mechanisms

(1)

Remove

the

top

cover

240

and

the

front

panel

233.

(Refer

to

section

1)

(2)

Unscrew

the

2

mechanism

holding

screws

(3x6

CBTS

S

tight)

304

from

the

bottom

surface

of

the

chassis

201.

(3)

Unscrew

the

2

screws

(3x6

CBTS

S

tight)

304

holding

the

angle

210

and

the

mechanism

207

and

the

3

chassis

holding

screws

301,310

and

remove

the

angle.

(4)

Remove

the

connectors

with

lead

wires,

which

runs

from

the

mechanism

section,

from

the

circuit

board.

Audio

circuit

board

side

2P

connector

CN101

CN201

3P

connector

CN303

Logic

circuit

board

side

2P

connector

CN2

CN3

4P

connector

CN9

CN13

(DR-IVI44HX

only)

5P

connector

CN10

6P

connector

CN9

(DR-IV133-

HX

only)

CN11

HX

PRO

circuit

board

side

3P

connector

CN801

4P

connector

CN802

Note:

When

assembling,

check

to

make

sure

the

con¬

nectors

are

inserted

correctly.

(4)

Meter

Window

(220)

may

be

removed

after

Front

Escutchion

is

removed.

(5)

Control

Button

(223)

should

be

removed

after

the

4

screws

(306)

(2.6

x

8

CBTS

P

Tight)

are

removed

which

secure

the

Press

Bar

(224).

-

9

-

4.

H

ow

to

Remove

the

Control

Circuit

Board

(1)

Remove

the

top

cover

240

and

the

front

panel

233

(Refer

to

section

1)

(2)

Remove

the

front

escuchion

221.

(Refer

to

section

3)

(3)

Remove

the

connectors

with

lead

wires

which

run

from

the

control

circuit

board

204.

FL

counter

circuit

board

side

5P

connector

CN404

Logic

circuit

board

side

8P

connector

CN4

CTS

circuit

board

side

4P

connector

CN701

CN704

(4)

By

unscrewing

3

screw

(3x8

CBTS

P

tight)

301

holding

the

control

circuit

board

and

loosening

the

3

hooks

on

the

control

circuit

board

204

can

be

removed.

Note;

When

replacing

the

tact

switch

257,

always

check

to

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

set

is

assembled.

7.

How

to

Remove

the

Audio

Circuit

Board

(1)

Remove

the

top

cover

240

and

the

front

panel

233.

(Refer

to

section

1)

(2)

Remove

the

angl

e

?

1P

^"f''r

to

section

2)

(3)

Remove

the

front

escuchion

221

and

the

meter

win¬

dow

220.

(Refer

to

section

3)

(4)

Remove

the

control

circuit

board

204,

and

the

FL

meter

256.

(Refer

to

sections

4,

5)

(5)

Remove

the

CTS

circuit

board

217.

(Refer

to

section

6

)

(6)

Remove

the

connectors

from

the

audio

circuit

board

203.

(7)

Unscrew

the

4

bottom

cover

holding

screws

(3x8

CBTS

P

tight)

308

on

the

back

side

of

the

chassis

201

and

remove

the

bottom

cover

218.

(8)

Unscrew

the

screw

301

holding

the

Audio

amp

circuit

board.

(9)

By

lifting

the

front

chassis

206

and

loosening

the

2

hooks

on

the

chassis

holding

the

audio

circuit

board

203,

the

audio

circuit

board

can

be

removed.

5.

How

to

Remove

the

FL

Meter

(1)

Remove

the

top

cover

240

(Refer

to

section

1)

(2)

Remove

the

connectors

on

the

FL

meter

circuit

board

205.

(3)

Remove

the

2

screws

(307)

(3

x

8

CFTS

S

Tight)

which

secure

FL

Meter,

Screw

(310)

(3

x

10

CBS),

and

washer

(3W).

Then

the

FL

Meter

may

be

removed.

CAUTION:

During

assembly,

avoid

snagging

the

Shield

Sheet

(243),

which

is

located

under

the

Counter/Meter

Circuit

board

(205),

on

the

FL

Meter.

6.

How

to

Remove

the

CTS

Circuit

Board

(DR-M44HX

only)

(1)

Ftemove

the

top

cover

240

(Refer

to

section

1)

(2)

Remove

the

4P

connectors

from

the

CTS

circuit

board

217.

(3)

The

CTS

circuit

board

217

can

be

removed

upwards

by

pulling

it

upwards

and

loosening

the

2

hooks

on

the

chassis

201.

When

Separating

the

Audio

Circuit

Board

by

itself

(10)

Unscrew

the

nut

holding

the

input

volume

253

and

remove

the

input

volume

and

the

shield

bracket

209

toward

the

rear.

.

(11)

Unscrew

the

nut

holding

the

output

volume

254.

(12)

Remove

the

spring

plate

holding

the

hedephone

jack

255.

(13)

By

removing

front

chassis

206,

the

audio

circuit

board

can

b%

removed

by

itself.

“

Note:

Most

repairs

to

the

audio

circuit

board

can

be

performed

by

removing

the

bottom

cover

on

the

chassis.

Refer

to

the

above

procedure

only

when

necessary.

When

reassembling,

follow

the

procedures

in

reverse

order;

however,

if

each

of

the

various

parts

are

not

assembled

properly

in

their

respective

position,

the

set

cannot

be

assembled.

When

assembling,

check

the

work

of

each

step

carefully.

-

1

0

-