Denon DR-M3QHX User manual

Table of contents

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Hi-Fi

Component

DENON

SERVICE

MANUAL

*

STEREO

CASSETTE

TAPE

DECK

MODEL

DR-M3QHX

NIPPON

COLUMBIA

CO..

LTD.

TABLE

OF

CONTENTS

FEATURES

.

2

SPECIFICATIONS.

3

BLOCK

DIAGRAM.

4

LEVEL

DIAGRAM

.

5

PART

NAMES

AND

FUNCTIONS

.

6-7

OUTLINE

OF

THE

MECHANISM

CONTROL

MICROCOMPUTER.

8

DISASSEMBLY

INSTRUCTIONS.

9-11

ADJUSTING

AND

CHECKING

THE

MECHANISM

SECTION

.12-14

ADJUSTING

THE

ELECTRICAL

SECTION.14-17

PARTS

LIST

OF

P.W.

BOARD

.18-19

PARTS

LIST

OF

EXPLODED

VIEW.

20

EXPLODED

VIEW

OF

CABINET

AND

CHASSIS

GROUP.

21

EXPLODED

VIEW

OF

MECHANISM

VM861

UNIT.

22

PARTS

LIST

OF

MECHANISM

VM861

UNIT

AND

OTHER

PARTS

.

23

FUNCTION

OF

REMOTE

CONTROL

1C

.

23

SCHEMATIC

DIAGRAM

OF

AUDIO

AMP

UNIT...

24

P.W.

BOARD

OF

KU-5881

AUDIO

AMP

UNIT.

25

SCHEMATIC

DIAGRAM

OF

POWER/LOGIC

UNIT.

26

P.W.

BOARD

OF

KU-5871

POWER/LOGIC

UNIT

AND

KU-5890

MECHANISM

UNIT

.

27

SCHEMATIC

DIAGRAM

OF

COUNTER

METER

UNIT

...

28

SEMICONDUCTORS.

29

WIRING

DIAGRAM

..

30

FEATURES

■

Computer-controlled

servo

technology

*

Closed-loop

dual-capstan

tape

transport.

*

Silent,

soft-touch

controls

provide

maximum

ea$e-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.

■

Computing

tape

counter

with

4-digit

readout

and

memory

stop.

■

Dolby-C

noise

reduction

systems

(Double

Dolby

System).

■

Dolby

HX

PRO

head

room

extension

system.

■

Wireless

remote

control.

■

Extended

range,

dual-color

fluorescent

peak

meters.

■

Auto

tape

selector.

■

Recording

Bias

adjustment.

(2)

SPECIFICATIONS

•

Type

.

•

Heads.

•

Motors.

•

Tape

Speed.

•

Fast

forward,

rewind

time

.

.

.

•

Recording

bias.

•

Overall

S/N

ratio

.

(at

3%

THD

level)

•

Overall

fequency

response.

.

.

.

•

Channel

separation.

•

Crosstalk.

•

Wow

Aflutter.

•

Inputs

line

.

•

Outputs

line

.

Headphone

.

•

Accessories.

•

Power

supply.

•

Power

consumption

.

•

Dimensions.

•

Weight.

Vertical

tape

loading

4-track

2-channel

stereo

cassette

tape

deck

SF

Record/Playback

combination

head

x

1

Erase

head

(Ferrite)

x

1

Electronic

servo

DC

motor

(for

capstan)

x

1

DC

motor

(for

reel

winding)

x

1

4.8

cm/sec.

Approx.

90

sec.

with

a

C-60

cassette

105

kHz

Dolby

C

NR

on

...

more

than

75

dB

(CCIR/ARM)

25

-

19,000

Hz

±3dB

(at

-20

dB

METAL

tape)

More

than

40

dB

(at

1

kHz)

More

than

65

dB

(at

1

kHz)

0.045%

wrms

(JIS

method)

lOOmV

(—18

dB)

input

level

at

maximum

Input

impedance:

50

kohm

unbalanced

775mV

(0

dB)

output

level

at

maximum

(with

47

kohm

load,

recorded

level

of

200

pwb/mm)

1.2mW

output

level

at

maximum

(optimum

load

impedance

8

ohm

—

1.2

kohm)

Parallel

pin

cord

x

2

50

Hz/60

Hz

compatible,

voltage

is

shown

on

rating

label

18W

434

(W)

x

115

(H)

x

286

(D)

mm

5.6

kg

■

Above

specifications

and

design

styling

are

subject

to

change

for

improvement.

■

Dolby

noise

reduction

and

HX

PRO

headroom

extension

manufactured

under

license

from

Dolby

Laboratories

Licensing

Corporation.

HX

PRO

riginated

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

mitliamps.

Corrective

measure

must

be

taken

if

it

exceeds

the

limit.

(3)

LINE

IN

--CH

@

BALANCE

VR303

26

IC102

TEA0665

INPUT

VR

VR304

ENCOOER

SLOCK

BLOCK

DIAGRAM

»

LEVEL

DIAGRAM

PLAYBACK

SYSTEM

TCC-130

(400Hz)

DOLBY

B-Typ»

RECORDING

SYSTEM

NPUT

FREQUENCY

400Hz

DOLBY

NR

SYSTEM

0dB=0.775V

(

5

)

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

approxi¬

mately

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

{

■

)

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

noise

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

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.

7.

MONITOR

switch

The

SOURCE

(in)

position

of

this

switch

allows

you

to

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.

8.

BIAS

FINE

ADJ

control

(for

NORMAL

and

Cr0

2

tape)

Adjust

the

bias

according

to

the

tape

characteristics.

Standard

biasing

is

obtained

at

the

center

click-stop

posi¬

tion.

9.

BALANCE

controls

This

is

the

knob

to

adjust

the

recording

level

balance

be¬

tween

the

left

and

right

channels.

Turn

it

counterclock¬

wise

to

reduce

the

right

channel's

level

and

clockwise

to

reduce

the

left

channel's.

Usually,

put

the

knob

at

the

center

click

position.

10.

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.

11.

OUTPUT

LEVEL

control

This

control

adjusts

playback,

recording

monitor,

and

headphones

output

levels

for

the

both

channels

simultane¬

ously.

12.

INPUT

LEVEL

controls

The

recording

input

level

is

adjusted

by

this

knob.

The

levels

in

the

left

and

right

channels

can

be

changed

sim¬

ultaneously.

(

6

)

<

T

*

13.

Cassette

compartment

cover

When

a

cassette

tape

is

inserted

and

the

door

is

closed,

the

tape

is

automatically

wound

up

for

about

0.3

sec

to

eliminate

the

slack.

14.

TAPE

COUNTER

A

four-digit

readout

indicates

the

present

tape

count

posi¬

tion.

15.

FLUORESCENT

PEAK

METERS

These

meters

indicate

recording

or

playback

peak

levels

for

each

channel.

16.

MEMORY

indicator

When

the

memory

switch

is

turned

on,

the

letters

of

"MEMO"

will

be

displayed.

17.

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

IB

nr

CiTvoe

18.

MONITOR

indicator

This

indicator

light

is

interlocked

with

the

MONITOR

switch

to

inform

the

use

of

the

selected

monitoring

source

-

TAPE

or

SOURCE.

19.

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,

Cr0

2

or

METAL).

20.

REMOTE

CONTROL

photosensitive

window

•The

window

receives

commands

from

the

infrared

remote

control

unit.

•Operate

the

remote

control

unit

(RC-101)

directing

to¬

ward

the

photosensitive

window.

21.

T

ape

transport

controls

(7)

I

•

Outline

of

the

Mechanism

Control

Microcom¬

puter

The

function

of

the

microcomputer,

which

is

applied

to

the

0)

Stable

and

accurate

cam

rotation

position

control

is

uni-directional

transport

cam

drive

control

cassette

deck

required

since

a

cam

drive

method

is

employed

to

mechanism,

will

receive

an

outside

signal

from

the

opera-

make

the

mechanism

silent.

Accurate

rotation

position

tion

switch

(operations

such

as

PLAY,

REC,

STOP,

FF)

control

is

performed

by

using

a

cam

drive

with

a

rotary

during

the

recognition

of

the

current

condition

or

from

the

encoder

detected

digital

feedback

servo,

surrounding

circuits

of

the

microcomputer

(counter,

cam

(2)

Since

the

leading

time

of

the

cam

drive

is

slower

when

encoder,

reel

pulse,

etc.)

and

sends

the

appropriate

con-

compared

to

that

of

the

plunger

method,

problems

will

trol

signal.

a

r

»

5

e

when

attempting

record/pi

ay

back

or

stop

at

the

To

the

mechanism:

rotational

direction

of

the

reel

motor,

designated

tape

position

from

FF

or

REW,

since

tape

speed,

stop,

rotational

direction

of

the

cam

motor,

stop.

overrun

occurs.

To

the

counter:

makes

an

output

of

the

mechanism

run

mode

command

(REW,

FF,

PAUSE,

PLAY).

To

the

display:

REC,

PAUSE

(REC

MUTE

during

flash).

In

addition,

the

following

points

are

taken

into

consider¬

ation.

(

8

)

DISASSEMBLY

INSTRUCTIONS

1.

H

o

w

to

Remove

the

Front

Panel

(1)

Unscrew

the

4

screws

309

from

both

sides

of

the

top

cover

240

and

take

off

the

top

cover

by

pulling

it

up.

(2)

Press

the

eject

knob

231,

open

the

cassette

window

238

and

take

off

the

mechanism,

as

shown

in

the

dia¬

gram.

Note:

Be

careful

when

handling

the

cassette

window,

as

it

is

easily

scratched.

(3)

T

he

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)

2.

H

o

w

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

4P

connector

CN301

6P

connector

CN302

Logic

circuit

board

side

6P

connector

CN1

7P

connector

CN3

8P

connector

CN2

Note:

When

assembling,

check

to

make

sure

the

con¬

nectors

are

inserted

correctly.

(5)

Pull

out

the

power

switch

lever

230

from

the

power

switch

259.

(6)

Remove

the

eject

knob

231.

(7)

The

mechanism

can

be

removed

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.

3.

H

o

w

to

Remove

the

Meter

Window

and

the

Color

Filter

(1)

Remove

Top

Cover

(240)

and

Front

Panel

(233)

(Refer

to

Section

1)

(2)

Meter

Window

(220)

can

be

removed

by

pulling

up.

(3)

Color

Filter

(221)

cam

be

removed

after

Meter

Window

(220)

is

removed.

4.

H

o

w

to

removed

the

Meter

Holder

and

the

Counter/Meter

Circuit

Board,

the

LED

circuit

Board.

(1)

Remove

the

top

cover

(240)

and

the

front

panel

(233).

(Refer

to

section

1)

(2)

Remove

the

angle

(210).

(Refer

to

section

2)

(3)

Remove

the

2

screws

(3x8CFTS

S

tight)

(307)

which

secure

meter

holder

(242).

Then

the

meter

holder

can

be

removed.

(4)

By

unscrewing

the

2

screws

(3x6

CBS)

(303)

holding

the

counter/meter

circuit

board,

it

can

be

removed.

(5)

By

unscrewing

the

1

screw

(3x6

CBS)

(303)

holding

the

LED

circuit

board,

it

can

be

removed.

(9)

5.

How

to

Remove

the

Front

Esc

Ass'y

(1)

Remove

the

top

cover

(240)

and

the

front

panel

(233).

(Refer

to

section

1)

(2)

Remove

the

angle

(210).

(Refer

to

section

2)

(3)

Remove

the

meter

window

(220)

and

the

color

filter

(221).

(Refer

to

section

3)

(4)

Unscrew

the

2

nuts

holding

the

output

volume

(237)

and

the

headphone

jack

(255).

Then

the

front

esc

ass'y

(206)

can

be

removed.

6.

How

to

Remove

the

Volume

Circuit

Board

(1)

Remove

the

top

cover

240

and

the

front

panel

233.

(Refer

to

section

1)

(2)

Remove

the

angle

210

(Refer

to

section

2)

(3)

Remove

the

meter

window

220

and

the

color

filter

221.

(Refer

to

section

3)

(4)

Remove

the

front

escuchion

206.

(Refer

to

section

4)

(5)

By

unscrewing

the

3

screws

(3x8

CBTS

P

tight)

301

holding

the

Volume

plate

245

and

loosening

the

2

hooks

on

the

front

escuchion

ass'y

206

holding

the

Volume

circuit

board

244,

it

can

be

removed.

(6)

Unscrew

the

3

nats

holding

the

3

Volumes.

Then

the

Volume

circuit

board

244

can

be

removed.

7.

How

to

Remove

the

Control

Circuit

Board

(1)

Remove

the

top

cover

240

and

the

front

panel

233.

(Refer

to

Section

1)

(2)

Remove

the

angle

210.

(Refer

to

section

2)

(3)

Remove

the

meter

window

220

and

the

color

filter

221.

(Refer

to

section

3)

(4)

Remove

the

front

escuchion

206.

(Refer

to

section

4)

(5)

By

unscrewing

the

3

screw

(3x8

CBTS

P

tight)

301

holding

the

control

circuit

board

and

loosening

the

2

hooks

on

the

front

escuchion

Ass’y

206

holding

the

control

circuit

board

204,

it

can

be

removed.

Note:

When

replacing

the

tact

switch

224,

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.

8.

H

o

w

to

Remove

the

Audio

Circuit

Board

(1)

Remove

the

top

cover

240

and

the

front

panel

233.

(Refer

to

section

1)

(2)

Remove

the

angle

210

(Refer

to

section

2)

(3)

Remove

the

meter

holder

242.

(Refer

to

section

4)

(4)

Remove

the

front

escuchion

206.

(5)

Remove

the

volume

plate

245.

(Refer

to

section

6)

(6)

Remove

the

control

circuit

board

204.

(Refer

to

section

7)

(7)

Remove

the

connectors

from

the

audio

circuit

board

203.

(8)

Unscrew

the

4

bottom

cover

holding

screws

(3x8

CBTS

P

tight)

301

on

the

back

side

of

the

chassis

201

and

remove

the

bottom

cover

218.

(9)

By

loosening

the

2

hooks

on

the

chassis

holding

the

audio

circuit

board

203,

the

audio

circuit

board

can

be

removed.

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

)

«

1

9.

H

ow

to

Remove

the

Logic

Circuit

Board

(1)

Remove

the

top

cover

240.

(Refer

to

section

1)

(2)

Remove

the

various

connectors

from

the

logic

circuit

board

202.

(3)

Unscrew

the

screws

(3x8

CBTS

P

tight)

301

holding

the

logic

circuit

board.

{4}

By

pulling

up

the

logic

circuit

board

202,

it

can

be

removed.

10.

How

to

Remove

the

Power

Switch

Circuit

Board

(1)

Remove

the

top

cover

240.

(Refer

to

section

1)

(2)

Unscrew

the

1

screw

(3x8

CBTS

P

tight)

301

holding

the

bracket

216

of

the

power

switch

circuit

board

215.

(3)

By

pulling

the

power

switch

lever

230

out

of

the

power

switch

259,

the

power

switch

circuit

board

215

can

be

removed

upwards.

11.

How

to

Remove

the

Remote

Sensor

Circuit

Board

(1)

Remove

the

top

cover

(240)

and

the

front

panel

(233).

(Refer

to

Section

1)

(2)

Remove

the

angle

(21).

(Refer

to

Section

2)

(3)

Remove

the

meter

holder

(242).

(Refer

to

Section

4)

(4)

By

unscrewing

the

1

screw

(3x6

CBS)

(303)

holding

the

Remote

Sensor

Circuit

Board,

it

can

be

removed.

(ID

i

«

1

ADJUSTING

AND

CHECKING

THE

MECHANISM

SECTION

1.

Replacing

the

Pinch

Roller.

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

rollers

and

capstan

shafts.

The

right

side

pinch

roller

23

can

be

taken

out

by

remov¬

ing

spring

24

and

slit

washer

317.

In

the

same

manner,

the

left

side

pinch

roller

104

can

be

taken

out

by

remov¬

ing

spring

106

and

slit

washer

317.

After

replacing,

play

a

padless

C-90

tape

and

check

for

tape

curls

at

the

head

tape

guide

section.

In

addition,

in

the

playback

mode,

check

to

make

sure

that

the

right

side

pinch

roller

contacts

the

capstan

shaft

before

the

left

side

pinch

roller

contacting.

3.

R

e

placing

the

Record/Ptayback

Head

*

Before

replacing,

remove

the

front

panel

233.

(1)

H

o

w

to

remove

the

R/P

HEAD.

1}

Next,

Take

out

the

azimuth

adjustment

NUT

311,

tilt

adjustment

NUT

311,

and

the

height

adjustment

Special

nut

10

loosening

them

alternately.

If

they

are

not

loosened

alternately,

the

R/P

HEAD

base

may

become

warped.

2)

By

unsoldering

the

HEAD

WIRES

on

the

circuit

board

section

of

the

R/P

HEAD,

the

entire

R/P

HEAD

can

be

taken

off

the

mechanism

unit.

<X>

R/P

head

Correct

P.

Roller

arm

L

(

JO)

Special

not

Tape

guide

2

nut

P.

Roller

arm

R

Tape

E.

head

Special

nut

/

2

nut

R/P

head

Defective

Curled

Curled

Tape

travel

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

capstan

shaft

again.

When

the

pinch

roller

starts

to

rotate,

check

to

make

sure

the

rod

type

spring

weight

reading

is

350g—450g

for

the

right

side

and

150g

~

250g

for

the

left

side.

If

it

is

not

within

the

normal

range,

replace

the

pinch

roller

spring

24

or

106.

Pinch

roller

spring

Capstan

shaft

.41.

/

Pinch

roller

Right

side

350g

~

450g

Left

side

150g

~

250g

(S7j)

2n

®>2N

(Azimuth

adj..nut)

(Tilt

adj.

nut)

(2)

H

ow

to

assemble

the

R/P

HEAD.

Reverse

the

above

(1)

procedures

for

removing

the

R/P

HEAD.

*

Solder

the

HEAD

WIRES

according

to

the

diagram

above.

ri+i

U+l

M|—i

U-l

1

—I

Orange

Yellow

White

4.

A

djusting

the

R/P

HEAD

(1)

H

eight

adjustments

(Use

the

head

adjusting

jig

THG-801

1)

Set

the

THG-801

tool

plate

on

the

mechanism

unit;

turn

the

height

adjustment

Special

nut

10

and

adjust

so

that

the

3.8

mm

measure

section

of

the

THG-801

{too!

grip)

can

pass

without

contacting

the

tape

guide

of

the

R/P

HEAD

9.

2)

When

adjusting

the

height,

make

sure

the

R/P

HEAD

is

not

tilted

by

turning

the

azimuth

adjustment

nut

311

nut,

and

checking

with

your

eyes.

*

Never

allow

the

THG-801

{tool

grip)

to

hit

the

tape

contact

surface

of

the

R/P

HEAD

strongly.

It

may

scratch

the

surface.

{

1

2

)

1

s

(2)

A

djusting

Tilt

Angie

1)

Set

the

THG-801

Tool

Plate

on

the

Mechanism

Unit

and

then

place

the

THG-801

Tool

Grip

on

the

R/P

Head,

and

check

the

Tilt

Angle

between

THG-801

Tool

Plate

and

THG-801

Tool

Grip.

If

the

THG-801

Tool

Grip

is

tilting

toward

the

front,

loosen

Tilt

with

nut

{311).

If

the

THG-801

(Tool

Grip)

is

tilting

toward

the

rear,

tighten

it.

Adjust

the

Tilt

Adjustment

nut

(311)

until

the

THG-801

Tool

Grip

becomes

parallel

with

the

THG-801

Tool

Plate.

2)

If

the

Tilt

Angle

is

adjusted

more

than

once,

height

Adjustment

may

slip.

Always

make

sure

to

check

height

adjustment.

If

height

has

slipped,

adjust

it

again.

After

adjustment,

fix

screw.

(3)

A

zimuth

adjustments

Play

back

the

A*BEX

TCC-153

test

tape.

Turn

the

azimuth

adjustment

nut

and

adjust

so

that

A

of

the

resurge

wave

form

is

maximum

and

B

is

minimum.

After

the

azimuth

adjustments,

re-check

the

head

height

with

the

THG-801

to

make

sure

the

height

has

not

deviated.

MTT-U4

*

After

the

adjustments,

apply

anaerobic

adhesive

on

the

positions

indicated

in

the

diagram.

Anaerobic

adhesive

5.

A

djustment

and

Replacement

of

Erasing

Head

(1)

Height

Adjustments

Set

the

THG-801

Tool

Plate

on

the

mechanism

unit.

Using

a

surface

measure

of

3.8

mm

from

the

THG-801

Tool

Grip,

turn

adjustment

nut

(311)

and

(171)

and

adjust

the

height

of

Erasing

Head's

center

to

coincide

with

the

center

of

the

THG-801

Tool

Grip.

After

adjustment,

place

the

THG-801

Tool

Grip

on

the

Erasing

Head,

check

to

see

that

the

THG-801

Tool

Plate

and

the

THG-801

Tool

Grip

are

parallel,

and

that

the

Tilt

Angle

has

not

changed.

Lock

after

adjustment.

(2)

Tilt

Angle

Adjustment

Set

the

THG-801

Tool

Plate

on

the

mechanism

unit.

Place

the

THG-801

Tool

Grip

on

the

Erasing

Head,

and

check

the

gap

between

the

THG-801

Tool

Plate

and

the

Tool

Grip.

If

the

THG-801

Tool

Grip

is

tilting

toward

the

front,

loosen

the

Tilt

adjustment

nut

(311).

If

it

is

tilting

toward

the

rear,

tighten

it

and

adjust

the

Tilt

adjustment

nut-

(311)

until

the

THG-801

Tool

Grip

becomes

parallel

with

the

THG-801

Tool

Plate.

CAUTION:

After

adjusting

the

Tilt

Angle,

height

adjust¬

ment

may

sometimes

be

warped.

Recheck

height

adjustment.

If

it

is

warped,

readjust

the

height.

After

adjusting,

fix

nuts

(311)

and

(171).

(3)

Erasing

Head

Replacement

Erase

Head

may

be

replaced

after

removing

nuts

(311)

and

(171}

which

affix

it

to

the

deck

mechanism.

After

replacement,

adjust

the

height

and

the

Tilt

angle.

1

6,

Height

Adjustment

of

the

Tape

Guide

Set

the

THG-801

jig

plate

onto

the

mechanism

unit

and

ad¬

just

the

height

by

rotating

the

height

adjustment

nut

311

so

that

the

3.8mm

section

of

the

THG-801

jig

can

pass

through

without

contacting

the

tape

guide

section

of

tape

guide

103.

7.

Checking

the

Take-up

Torque

Load

the

cassette

type

torque

meter.

Check

to

make

sure

that

the

torque

meter

average

reading

is

within

40

80

g-cm

during

playback.

If

it

is

not

within

this

range,

check

the

voltage

(4.3V

±

0.3V)

of

the

reel

motor.

If

the

voltage

is

low,

the

torque

will

be

weak;

if

it

is

high,

the

torque

will

be

strong.

In

addition,

check

for

reel

thrust

movement

in

section

8.

(13)

i

8.

Adjusting

the

Reel

Thrust

Movement

Check

to

make

sure

that

the

reel

thrust

movement

is

within

0.2—0.4

mm.

9.

Checking

the

FF

and

REW

Torques

*

When

using

the

cassette

type

torque

meter.

Check

to

make

sure

the

torque

meter

indicates

more

than

80

~

160

g*cm

at

the

end

of

FF

and

REW.

*

When

using

a

modified

cassette

half.

Load

the

modified

cassette

half;

hook

the

end

of

the

dial

tension

meter

(full

scale

100—300

g)

onto

the

triangle

section.

In

the

FF

(REW)

mode,

feed

the

tape

in

at

a

rate

somewhat

slower

than

the

take

up

speed.

Check

to

make

sure

the

dial

tension

meter

reads

more

than

60

g-cm.

10.

Checking

the

Back

Tension

Torque

During

Record/Playback

Load

the

cassette

type

torque

meter;

check

to

make

sure

the

torque

meter

reads

between

5^13

g-cm

during

play¬

back

and

that

there

is

no

unevenness.

If

it

is

not

within

this

range,

check

the

section

on

adjust¬

ing

the

reel

trust

movement;

or

replace

the

spring

109.

11.

Checking

the

FF

and

REW

Times

Load

a

C-60

cassette

tape;

check

to

make

sure

the

tape

is

fast

forwarded

or

rewound

within

70—110

seconds.

If

it

is

not

within

this

range,

check

sections

8

and

10.

12.

Checking

the

Operation

of

the

Erase

Preven¬

tion,

Metal

and

Chrome

Switch

Operation

Arms

Check

to

make

sure

the

operation

arms

58,

59

operate

the

switches

positively,

depending

on

whether

or

not

there

are

holes.

13.

Checking

the

EJECT

Switch

To

check

the

operation

of

the

EJECT

SW

with

only

the

mechanism

unit,

make

sure

the

angle

205

operates

the

switch

positively

when

the

hook

lever

203

is

operated.

14.

Checking

the

Gap

Between

the

Pulse

Detection

LED

and

the

Reel

Ass'y

Check

to

make

sure

the

gap

between

the

surface

of

the

shutter

section

of

the

reel

ass'y

and

the

LEDs

is

approxi¬

mately

1

mm.

25

Reef

Ass'y

Approximately

1

mm

ADJUSTING

THE

ELECTRICAL

SECTIONS

•

Measuring

instruments

necessary

for

adjustments

(1)

Audio

signal

generator

(2)

Variable

resistance

attenuator

(3)

Electronic

voltmeter

14)

Oscilloscope

(5)

Frequency

counter

(6)

Adjustment

screwdriver

(7)

Trap

coil

adjustment

square

stick

(8)

Test

tapes

(SONY

TY-224,

A-BEX

TCC-153,

TCC-130

(A-BEX

TCC-262)

(OENON

DX3H,

HD7E)

(9)

Transport

Check

cassette

tape

(A-BEX

TCC-902)

Mirror

tape

•

Cautions

on

adjusting

(1)

Before

adjusting,

clean

the

head

surface,

capstan

and

the

pinch

roller

with

a

gauze

or

a

cotton

swab

moisten¬

ed

with

alcohol.

(2)

Demagnetize

the

R/P

HEAD

and

the

E.

HEAD

with

a

head

eraser.

(3)

Completely

demagnetize

the

adjustment

screwdriver.

(4)

Unless

instructed

otherwise,

set

the

various

controls

as

follows:

—

INPUT

volume.

maximum

—

OUTPUT

LEVEL

volume.

maximum

-

DOLBY

NR

switch

.OFF

-MONITOR

switch.TAPE

1.

T

ape

Transport

Check

Load

the

transport

check

cassette.

In

the

operational

mode,

illuminate

the

fixing

guides

of

the

R/P

HEAD

with

a

lamp

and

check

to

make

sure

the

tape

edge

does

not

come

in

contact

with

the

tape

guide

section.

The

tape

transport

is

the

most

important

element

in

de-

terming

the

performance

of

a

cassette

deck.

Avoid

moving

the

various

adjustment

screws,

nuts,

etc.,

as

much

as

possible.

The

THG-801

Tool

Plate

is

a

tool

used

primarily

for

precisely

adjusting

the

height

of

the

tape

guide

attached

to

a

tape

head.

This

tools

is

indispensable

in

repairing

various

heads,

when

replacing

heads,

and

for

design

purposes,

in

order

to

deter¬

mine

the

location

measurements

for

mechanical

attach¬

ments.

Even

when

the

height

of

the

tape

guide

is

accurately

meas¬

ured,

during

actual

tape

play,

the

tape

may

sometimes

warp.

This

is

due

to

slight

errors

in

dimensions

of

those

parts

which

actually

come

in

contact

with

the

tape,

such

as

cas¬

sette

halves,

heads,

pinch-rollers,

capstan

shaft,

etc.

There¬

fore

a

mirror

tape

is

used

to

confirm

proper

running

of

the

tape.

In

this

way,

the

THG-801

Tool

Plate

and

mirror

tape

are

both

used

to

insure

good

tape

running.

f

After

having

confirmed

that

the

setting

is

correct,

the

mir¬

ror

tape

may

warp

anyway.

In

order

to

establish

the

titlt

angles

of

the

recording/plaback

head

and

the

erase

head,

adjust

(by

turning

1/4

-

1/2

turns)

the

level

adjustment

nut

(311)

of

the

tape

guide

(103).

Refer

to

the

pages

on

"Adjusting

and

checking

the

Mechanism

Section"

when

replacing

or

adjusting

the

R/P

HEAD.

2.

A

d

justing

the

Azimuth

(1)

After

completing

the

tape

transport

check

load

the

test

tape

(A-BEX

TCC-153)

(2)

Play

back

the

test

tape;

adjust

the

azimuth

nut

so

that

section

A

of

the

resurge

wave

form

is

maximum

and

section

B

is

minimum.

MTT-II4

3.

C

hecking

and

Adjusting

the

Tape

Speed

1)

Connect

the

frequency

counter

to

the

LINE

OUT

terminal

and

load

the

test

tape

(SONY

TY-224).

2}

Playback

a

test

tape.

At

about

halfway

through

the

tape,

where

the

tape

transport

is

stable,

adjust

the

adjustment

points

on

the

back

of

the

capstan

motor

so

that

the

frequency

counter

will

have

a

reading

with¬

in

the

the

range

of

3,000

Hz

±

6Hz.

HTT-m

4.

A

djusting

the

Input

Sensitivity

(1)

Set

the

MONITOR

switch

to

SOURCE

position,

the

operational

mode

at

STOP.

Supply

a

400

Hz

signal

to

the

LINE

IN

terminal

and

set

the

input

signal

level

(approx.

—18

dB)

so

that

the

output

level

at

the

LINE

OUT

TERMINAL

(L

ch)

becomes

OdB.

DC

motor

Adjustment

Points

Capstan

motor

(2)

At

the

same

time,

check

to

make

sure

the

R

ch

output

level

is

also

OdB.

REC

Amp

5.

A

djusting

Playback

Section

(1)

Adjusting

the

playback

level

Play

back

the

Dolby

standard

level

test

tape

(A-BEX

TCC-130)

and

adjust

RT-101

(L

ch),

RT-201

(R

ch)

so

that

the

LINE

OUT

voltage

becomes

0

dB

(0.775V).

(2)

Adjusting

the

playback

frequency

response

Play

back

the

test

tape

(A-BEX

TCC-262)

and

check

to

make

sure

that

the

frequency

response

meets

the

specifications

in

the

diagram.

(15)

>

I

t

*

K

6.

Adjusting

the

FL

Meter

After

adjusting

the

playback

level,

playback

the

test

tape

(A-BEX

TCC-130)

and

adjust

RT401

(L

ch),

RT402

(R

ch)

so

that

the

FL

meter

indicates

OdB

when

the

LINE

OUT

terminal

level

is

OdB

(0.775V).

7.

Adjusting

the

Recording

Section

(1)

A

djusting

the

record/play

back

overall

frequency

response.

1)

Load

the

test

tape

HD7E/C60;

record

a

signal

with

an

input

level

of—38

dB,

1

KHz

at

the

LINE

IN

terminal;

play

back

this

recording.

2)

Change

the

frequency

of

the

input

signal

to

12kHz,

record

and

playback;

adjust

RT104(Lch),

RT204

(R

ch)

so

that

the

characteristic

standards

meet

the

following

diagram

when

compared

to

the

1kHz

signal

output

level.

Record/Playback

Overall

Frequency

Response

Tape:

H07E

Dolby:

off

Level:

—20dB

from

Dolby.

(16)

(2)

Adjusting

the

record/pi

ay

back

levels

1)

Load

the

test

tape

HD7E/C-60

and

record

a

signal

of

1kHz

(-38

dB).

2)

Adjust

RT102

(L

ch),

RT202

(R

ch)

so

that

the

output

level

is

the

same

when

the

MONITOR

switch

is

switched

from

SOURCE

to

TAPE

position.

(3)

Checking

the

Dolby

C

record/playback

overall

fre¬

quency

response

1)

Set

the

DOLBY

NR

switch

to

the

"C"

position.

2)

Using

the

test

tapes

DXM,

HD7E/C-60.DX3H,

per¬

form

record/playback

in

the

same

manner

as

7-(1).

3)

Check

to

make

sure

that

the

record/playback

overall

frequency

response

meets

the

specifications

in

the

diagram.

Dolby

C

Record/Playback

Overall

Frequency

Response.

Tape:

HD7E

Dolby:

on,

C

Level:

—

20dB

from

Dolby

OOLBY-C

m

RE

CORO/PLAY

BACK

•

Beat

Interference

Beat

interference

may

result

if

the

unit

is

used

close

to

an

AM

tuner.

In

this

case

separate

the

distance

between

the

tuner

and

the

cassette

deck.

(17)