Mitsubishi Electric MC-8000 Bedienungsanleitung

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pa

MITSU

BISHI

UDIO

SYSTEMS

SERVICE

MANUAL

MUSIC

CENTRE

MODEL

MC-8000

ae

MITSUBISHI

ELECTRIC

(U.K)

LTD.

MC-8000

|

SPECIFICATIONS

FM

Section

Tuningrange

............

87.5MHz

~

108MHz

Usable

sensitivity

.........

0.9uV

(75

ohms}

Total

harmonic

distortion

...

0.2%

Image

response

ratio

.......

45dB

Signal

to

noiseratio

.......

70dB

Stereo

separation

.........

35dB

Ae@tial

ins)

irises

a

eal

aed

Impedance

300

ohms

balanced

and

75

ohms

unbalanced

MW

Section

Tuning

range

............

525kHz

~

1,605kHz

Sensitivity

...........045

600uV/m

(S/N:

26dB)

Image

response

ratio

.......

40dB

ACV

lal

ee

a:

acd

ee

x

wt

St

na

es

Ferrite

bar

aerial

LW

Section

Tuningrange

............

150kHz

~

350kHz

Sensitivity

...........0006

2mV/m

(S/N:

26dB}

Image

response

ratio

.......

35dB

Aerial

ses

ches

a

iw

ae

ote

etd

thats

Ferrite

bar

aerial

AMPLIFIER

SECTION

Power

output

(1kHz,

both

channels

driven

into

into

8

ohms,

THD

0.5%)

25

watts

+

25

watts

(4

ohms)

20

watts

+

20

watts

(8

ohms)

Total

harmonic

distortion

(1kHz

from

AUX)

Input

sensitivity/Impedance

.

.

Frequency

response

sa

ee

ee

.

0.05%

(10

watts

per

chan-

nel

power

output,

4

ohms)

MIC

1.5

mV/10k

ohms

30Hz~20kHz

(£1.5

dB)

Hum.and

Noise

..........

60dB

(DIN)

Tone

controls

BASS

2

decade

bes

+8d8

(100Hz)

TREBLE.............

+8dB

(10kHz)

TURNTABLE

SECTION

TYPOS

pecan

actee

sk

iteeeie

ala

Electronically

controlled

fully

automatic

operation

Phono

Motor

Section

Drive

mechanism

.........

Belt

drive

Motor

sede

oa

ee

eee.

DC

servo

motor

Platten’

<0

08

at

esis

taeda

30cm

(Aluminum

die-cast)

Platter

speed

............

33-1/3,

45

r.p.m

Wow

and

flutter

..........

0.06%

(W.R.M.S)

Signal

to

noiseratio

.......

55dB

(1EC-B),

65dB

(DIN-B)

Tonearm

Section

Ty

pee

4

sos.

a

ee

een

ee

Linear

tracking,

straight

tubular

type,

statically

balanced

Cartridge...............

AT-71

(Audio

technical)

StVlUS

226

echt,

dee

See

es

Diamond

Stylus

pressure...........

2Qr

CASSETTE

DECK

SECTION

ThaCkS

vw

oo

See

Wise

ote

4

track,

2

channel

Tape

speed

..........00

4.75cm/sec.

Recording

system

.........

AC

bias

(85ktiz)

Erasing

system

...........

AC

erasing

(85kHz)

Playback

equalization

Normal

..........005-

3,180usec./120usec.

Special

and

Metal

.......

3,180usec./70usec.

Frequency

response

.

Normal

........2.20005

30Hz~13,000Hz

Special

and

Metal

.......

30Hz~16,000Hz

Signal

to

noise

ratio

DOLBY

NR

out........

45dB

(DIN)

DOLBY

NRin.........

52dB

(DIN)

Wow

and

flutter

..........

0.07%

(W.R.M.S)

Channel

separation

........

25dB

Crosstalk

.u5

tec

ase cht

eis

50dB

MOtor?.ia8.8

oka

etoven

es

DC

servo

motor

GENERAL

Power

(Mains)

consumption

.

.

.

460

x

585

x

245

mm

Dimensions

(W

x

H

x

D)

170

watts

(IEC

nominal)

(18-1/8

x

23-3/4

x

9-5/8”)

Weight

.............0%

18.5

kg

(40.8

Ibs)

Accessories

.........2...

T

shaped

FM

aerial

AM

lead

aerial

Screwdriver

(For

Preset

FM

adjustment)

Black

mat

17,30

cm

(For

transparent

or

coloured

records)

Wrench

(For

fitting

turn-

table)

Cloth

cover

“DOLBY”

and

the

Double

D

symbol

“

—(]”’

are

trademarks

of

Dolby

Laboratories.

Noise

reduction

system

manufactured

under

license

from

Dolby

laboratories.

Design

and

specifications

are

subject

to

change

without

notice

for

reason

of

improvement.

INSTRUCTION

OF

TUNER

SECTION

ATTENTION

about

AUX/TV<>

TUNER

switch

®

Usually,

in

case

of

using

the

tuner

of

MC-8000,

set

the

AUX/TV+

+»

TUNER

switch

on

the

rear

side

to

TUNER

position.

Contraly,

by

setting

this

switch

to

AUX/TV

side,

it

is

Possible

to

select

source

connected

AUX/TV

IN

terminal

by

the

SELECTOR

on

the

front

panel.

|

MC-8000

AUX/TU

LINE.

AUX/TV

Qu

Si

i

a

LISTENING

TO

FM,

MW,

LW

BROADCAST

(Manual

Tuning)

Set the

SELECTOR

switch

to

the

TUNER

position.

This

will

cause

the

TUNER

symbol

to

illuminate

on

the

selector

display.

SELECTOR

TUNER

mare

=

PHONO

TUNER

(ema,

(AUX)

Using

the

MANUAL

button,

select

the

FM,

MW

or

LW

broadcast.

.

MANUAL

0

0

Set

it

to

the

desired

station.

f

When

proper

tuning

is

attained

for

that

particular

broad-

casting

station,

the

centre

of

the

dial

pointer

will

grow

in

red

more

intensively

is

the

optimum

tuning

point.

When

an

FM

stereo

broadcast

is

being

received,

“FM

STEREO”

indicator

will

be

itluminated.

98

190

1

FM

1200

|.

280

Select

the

desired

volume

level

with

the

VOLUME

control.

The

volume

of

the

left-side

and

right-side

speakers

can

be

adjusted

by

means

of

the

BALANCE

control

located

inward

of

the

VOLUME

control.

FM

PRESETTING

The

MC-8000

is

capable

of

presetting

six

FM

stations.

Presetting

is

performed

in

the

following

manner.

1.

Depress

PRESET

button

1,

and

while

monitoring

an

actual

broadcast,

either

through

speakers

or

through

headphones,

turn

the

PRESET

TUNING

1

screw

using

the

supplied

screwdriver

to

obtain

proper

tuning.

(When

the

screw

is

turned,

the

pointer

of

the

frequency

meter

will

indicate

that

particular

frequency.)

2.

Similar

to

1,

set

PRESET

button

2,

by

adjusting

PRE-

SET

TUNING

screw.

3.

Preset

all

the

six

FM

stations

following

the

above

pro-

cedures.

ae

7s,

et

FM

prt

1-7

32

2

5

2

ie

ay

4.

When

you

wish

to

change

presetting,

this

can

be

ac-

complished

by

following

the

ordinary

presetting

pro-

cedures.

LISTENING

TO FM

BROADCAST

(Preset

Tun-

ing)

Set

the

SELECTOR

to

the

TUNER

position.

Select

the

desired

FM

station.

The

frequency

that

has

been

preset

in

the

frequency

meter

will

be

displayed.

FREQ

METER

MC-8000

DISASSEMBLY

INSTRUCTIONS.....

1.

Removal

of

Shaft

1)

Remove

the

platter

clamping

nut

with

the

supplied

wrench

and

dismount

the

platter

from

the

body.

2)

Remove

the

bottom

cover

of

the

set.

3)

Disengage

the

belt

from

the

fly-wheel.

4)

Remove

the

screw

and

washer

(Fig.

1)

fixing

the

fly-

wheel.

Flywheel

Screw

Washer

Fig.

1

5)

If

the

fly-wheel

and

shaft

are

too

tightly

fit

together,

insert

a

plus

screwdriver

into

the

forward

end

of

the

shaft,

and

gently

hit

the

screwdriver.

The

fly-wheel

will

easily

come

off.

6)

Remove

the

shaft’s

E-ring

(Fig.

2).

The

shaft

will

come

off

toward

your

side.

Shaft

bearing

shaft

Fig.

2

2.

Removal

of

Turntable

Unit

1)

Take

off

the

platter

and

the

rear

cover.

2)

Remove

the

disc

holder

cap

from

the

holder,

turning

it

counterclockwise.

(Refer

to

Fig.

3.)

Clockwise

direction

ey

t

Holder

\

sé

Counterclockwise

direction

=.

p

B

Ca

Fig.

3

3)

Unscrew

the

four

fixing

screws

D

for

the

metal

C

located

on

top

of

the

shaft.

(Refer

to

Fig.

4.)

4)

While

slipping

the

wire,

move

the

tonearm

to

a

point

close

to

the

center

shaft.

5)

Now,

from

the

chassis

side

(rear

panel),

remove

the

five

fixing

screws

F

.

(Refer

to

Fig.

5.)

Turntable

Section

Screw

D

Front

view

/

Fig.

4

Screw

F

©

Turntable

unit

Rear

view

Fig.

5

6)

With

this,

the

turntable

unit

can

be

removed

from

the

cabinet.

3.

Replacement

of

Tonearm

1)

Remove

the

two

tonearm

fixing

screws.

2)

Using

a

soldering

iron,

disconnect

the

four

output

cords

(2

single-core

shield

cords

and

2

single

cords)

from

the

tonearm.

3)

When

the

tonearm

mounting

nut

(

G

of

Fig.

6)

is

removed,

the

tonearm

will

come

off

from

the

tonearm

base.

Tonearm

base

Tonearm

|

MC-8000

DISASSEMBLY

INSTRUCTIONS

.....

Tuner

&

Amplifier

Section

1.

Removal

of

Rear

Cover

(Refer

to

Fig.

1.)

1)

Remove

the

14

screws

(1)

(black

bind

head

tapping

screw,

3

x

16).

2)

Remove

the

screw

(2)

(black

bind

head

tapping

screw,

3x

16).

aa

3)

Unscrew

the

two

screws

@)

(black

bind

head,

M3

x

8)

and

shake

proof

washer

on

the

threaded

section

to

the

right.

4)

Remove

the

screw

(4)

(black

bind

head

tapping

screw,

3x

10).

5)

Remove

the

four

screws

&)

(black

bind

head

tapping

screw,

4

x

10).

6)

When

the

two

screws

@)

(black

bind

head

tapping

screw,

3

x

12)

are

removed,

the

power

switch

c.

board

and

knob

will

come

off.

|

i>®

7)

Pull

out

the

lead

connectors

from

the

transformer

|.

Bottom

side

(Fig.

2)

at

7

points.

|||

rear

cover

Amp

P.C.B

Deck

P.C.B

-*

®

Connector

P.C.B

Fig.

1

Connectors

saisiasidacciauinal

|

tt

8

j901—=0

Red

leads

Ss

=

Sa

a

Orange

Black

leads

;

leads

te

Green

leads

§

Sf

Bottom

Bottom

plate

plate

\

cannot

be

can

be

removed

removed

NOTE:

For

reinstallation

the

lead

in

pairs

shoud

be

push

into

the

terminals

after

braiding

them

together

for

at

least

7

times

Power

transformer

Fig.

2

2.

Drawing

Out

Lower-section

Body

1)

With

the

body

laying

on

its

side,

remove

the

six

screws

(yellow

bind

head,

M4

x

16)

and

six

washers

shown

in

Fig.

3.

(For

sets

with

serial

numbers

from

No,

801

onward,

the

four

screws

(1)

and

washers

shown

in

a

a

Fig.

4

are

to

be

removed.)

2)

Unscrew

the

six

screws

(yellow

bind

head

tapping

screw,

4

x

10)

and

washers

located

inside

the cabinet.

(Refer

to

Fig.

5.)

MC-8000

|

3)

Remove

the

two

screws

(1)

(black

bind

head

tapping

screw,

3

x

16)

shown

in

Fig.

6.

®@

Disconnect

the

lead

wire

clamper

of

Section

B.

®@

Disconnect

jack

J701.

®@

Dismount

the

disc

operating

button

c.

board

shown

in

Fig.

7,

by

pushing

it

in

the

direction

of

the

arrow.

J701

x

From

disc

operating

{

©)

[

J

ge)

From

Deck

P.C

.B

FEIe

TE,

tl

A

Leads

clumper

@

Terminal

plate

o

Fig.

6

Hook

part

Disc

operating

P.C.B

Fig.

7

3.

Removal

of

Tuner

C.

Board

1)

Pull

out

the

tuning

knob.

2)

Remove

the

two

screws

(yellow

bind

head,

3

x

12)

shown

in

Fig.

8.

NOTE:

Remember

to

draw

out

the

GND

lug

prior

to

assembly.

Tuning

shaft

=

A

GND

lug

terminal

with

black

lead

is

attached

to

the

lower

side

Fig.

8

3)

Remove

the

two

plastic

rivets

a

shown

in

Fig.

9.

This

is

accomplished

by

pulling

out

Section

A

of

the

rivet

first

in

the

manner

shown

in

Fig.

10,

and

then

pulling

out

Section

B.

NOTE:

For

reinstallation,

insert

Section

B

(Fig.

10)

of

the

plastic

rivet

first,

and

then

insert

Section

A.

4)

When

the

screw

(2)

(yellow

bind

head

tapping

screw,

3

x

12)

shown

in

Fig.

9

is

removed,

the

Tuner

C,

Board

will

come

off

toward

the

back,

Tuner

P.C.B

Fig.

9

Ye

®

<)>

Hold

it

with

a

pair

of

OT

nippers

and

pull

it

out

»

We

Fig.

10

4,

Removal

of

Dial

Ass’y

from

Tuner

C.

Board

The

dial

ass’y

can

be

dismounted

by

removing

the

three

screws

(3)

(yellow

bind

head

tapping

screw,

3

x

12)

shown

in

Fig.

9,

NOTE:

Mount

the

dial

ass’y

onto

the

circuit

board,

with

VR201

shown

in

Fig.

11

turned

counterclockwise

as

far

as

it

will

go

and

with

the

center

position

of

the

pointer

shown

in

Fig.

11

aligned

with

the

mark

at

the

left

end.

Dial

pulley

VR201

1)

After

pulling

out

the

VOLUME,

BALANCE,

BASS

and

TREBLE

knobs,

take

off

the

nuts

used

for

fixing

the

shafts.

5.

Removal

of

Bottom

Plate

(Only

for

sets

with

serial

numbers

from

#801

onward).

The

bottom

plate

can

be

removed

by

removing

the

eight

screws

(yellow

bind

head,

M4

x

16)

and

washers

shown

in

Fig.

4.

(This

condition

will

permit

checking

of

circuit

board

from

the

bottom

side.)

|

MIC-8000

DISASSEMBLY

INSTRUCTION

Cassette

Deck

Section

1.

Removal

of

Cassette

Deck

C.

Board

and

Mechanism

Ass’y

The

Cassette

Deck

C.

Board

and

mechanism

ass’y

can

be

removed

in

the

condition

with

the

mechanism

mounted

on

the

c.

board.

1)

Following

the

Disassembly

Instructions

for

the

Tuner

and

Amplifier

Section,

take

off

the

rear

cover

and

draw

out

the

lower-section

body

toward

the

front.

2)

Take

off

the

cassette

cover.

3)

After

pulling

out

the

REC

LEVEL

and

MIXING

knobs,

remove

the nut

fixing

the

variable

resistors

(VRs).

4)

Using

a

nipper,

or

the

like,

cut

off

the

wire

clamper

fixing

the

wiring

leading

out

from

the

panel

section.

Also

disconnect

the

plugs

connected

to

the

Cassette

Deck

C.

Board.

NOTE:

When

reinstalling,

arrange

the

wiring

neatly

and

fix

it

to

its

former

position

using

the

wire

clamper.

5)

Remove

the

four

screws

(yellow

bind

head,

3

x

12)

shown

in

Fig.

1

used

for

fixing

the

mechanism

ass’y.

6)

Remove

the

two

screws

(black

bind

head,

tapped,

3

x

8)

shown

in

Fig.

2.

7)

Disengage

the

belt

on

the

tape

counter.

8)

The

circuit

board

and

mechanism

ass’y

can

be

dis-

mounted

in

this

condition.

The

mechanism

ass’y

is

secured

by

bending

the

pawis

which

are

inserted

into

the

circuit

board.

To

take

off

the

mechanism

ass‘y,

unbend

these

pawls

first,

using

a

pair

of

pliers.

Remove

four

screws

Belt

for

counter

C.

board

Remove

two

black

screw

Fig.

2

MC-8000

|

ADJUSTMENT

INSTRUCTIONS

Turntable

Section

Height

Adjustment

for

Tonearm

Lifter

1)

Using

a

1.2

mm

hexagon

wrench,

loosen

the

set

screw

on

the

tonearm

lifter.

2)

Adjust

it

so

that

there

will

be

about

a

1

mm

clearance

between

the

tonearm

and

tonearm

lifter

when

the

tone-

arm

is

at

the

rest

position

(STOP

mode).

Fix

the

tone-

arm

lifter

in

place.

"

Hexagonal

wrench

(1.2mm)

@®

Set

screwvi2.6

x3)

ie

1.2mm

approx.

1mm

ADJUSTING

POINTS

OF

TUNER

SECTION

2-3

MW

1650kHz

52O0kHz

C308

T302

C321

C303

360kHz

Tuner

C,

board

(parts

side)

HOW

TO

REPLACE

A

CARTRIDGE

1,

The

stylus

can

be

removed

by

taking

out

as

shown

in

the

illustration.

Head

shell

Cartridge

=

Hold

this

part

2.

When

inserting

a

new

stylus,

slide

the

protruding

part

into

the

cartridge,

and

then

move

the

stylus

back

in

the

reverse

direction

the

previous

step

as

shown

below.

Emitter

L301

|

|[IVR208;

NUH

VR21I3

M20}

FREQ.

Meter

indication

to

max.

indication

ADJUSTMENT

INSTRUCTIONS

...

Tuner

Section

Before

Starting

Adjustment

Confirm

alignment

of

the

pointer’s

center

with

the

mark

at

the

left

end

(Point

A

shown

on

page

8)

when

the

dial

pointer

is

moved

to

the

minimum

frequency

position.

(At

this

time,

VR201

will

be

at

its

position

turned

fully

counterclockwise.)

1.

LW

Adjustment

1)

Turn

on

the

MANUAL

LW

switch.

2)

Adjust

VR208

for

25V

at

0214's

emitter

(E).

3)

Adjust

V209

for

IV

at

the

hot-side

terminal

of

VR209.

4)

With

the

tuning

knob

and

VR201

at

their

positions

turned

fully

clockwise

(maximum

frequency

position),

adjust

VR213

so

that

the

pointer

of

M201

(Frequency

indicator

meter)

will

be

aligned

with

the

scale

at

the

right

end.

5)

With

pointer

aligned

with

88M

of

the

holder,

adjust

LW

coil

L301

and

T301

for

maximum

sensitivity

at

140kHz.

6)

With

the

pointer

aligned

with

108M

of

the

holder,

adjust

C303

and

C321

for

maximum

sensitivity

at

360kHz.

7)

Repeat

(5)

and

(6).

2.

MW

Adjustment

1)

Turn

on

the

MANUAL

MW

switch,

2)

Adjust

VR208

and

VR209

as

described

as

above,

the

LW

adjustment

steps

(2)

through

(4).

With

the

tuning

knob

and

VR201

turned

fully

counter-

clockwise

(minimum

receiving

frequency),

adjust

T302

so

as

to

enable

reception

of

520kHz.

Then,

with

VR201

turned

fully

clockwise

(maximum

receiving

frequency),

adjust

C308

so

as

to

enable

reception

of

1,650kHz.

4)

Receive

600

kHz

and

adjust

the

position

of

L601's

(bar

antenna’s)

coil

for

maximum

sensitivity.

5)

Receive

1,400kHz

and

adjust

C325

for

maximum

sensitivity.

6)

Repeat

steps

(6)

and

(7).

3.

3.

FM

Adjustment

1)

Turn

on

MANUAL

FM

switch.

2)

Adjust

the

primary

side

of

T201

so

that

the

voltage

at

both

ends

of

R214

will

become

zero

in

the

no-signal

mode

in

the

neighborhood

of

98

MHz.

3)

Align

pointer

with

the

“108”

mark

position

found

to

the

right

(higher

frequency

side)

of

Point

A

shown

in

figure

on

page

8.

In

this

condition,

adjust

VR211

so

as

to

enable

reception

of

108

MHz,

4)

As

in

Step

3,

align

pointer

to

the

“88”

mark

Position

and

adjust

VR210

so

as

to

enable

reception

of

88

MHz.

5)

Receive

signals

of

98

MHz,

65

dBf,

1

kHz,

100%

modu-

lation

(MONO)

and

adjust

the

secondary

side

of

T201

for

minimum

distortion.

Also,

readjust

the

primary

side

of

T201

so

that

the

voltage

at

both

ends

of

R214

will

be

zero.

Repeat

adjustments

of

the

primary

and

sec-

ondary

sides

several

times.

6)

Change

modulation

of

Step

5

to

0

%.

After

inserting

a

resistor

of

about

22

k{Q2Q

at

Pin

3

of

1C202,

connect

a

frequency

counter

and

adjust

VR212

for

a

counter

reading

of

19

kHz

+

50Hz.

|

MC-8000

ADJUSTMENT

INSTRUCTION

Eves

Mechanism

Section

of

Cassette

Deck

1.

Tape

speed

1)

Connect

a

frequency

counter

to

the

LINE

OUT

terminal.

2)

Play

Test

Tape

MTT-111

(3kHz),

and

adjust

the

variable

resistor

of

the

servo

circuit

with

a

minus

screw

driver

(inserting

it

through

the

motor-adjusting

hole}

so

that

the

reading

of

the

frequency

counter

will

be

within

3,000

Hz

*3°

Hz,

2.

Head

Azimuth

Adjustment

1)

Connect

an

AC

voltmeter

to

the

output

terminal.

2)

While

playing

Test

Tape

MTT-215E

(8

kHz),

adjust

the

head

azimuth

adjustment

screw

for

maximum

output

for

the

L-ch

and

R-ch.

3)

After

adjustment,

apply

screw-lock

paint

to

the

screw.

3.

Erase

Head

Adjustment

1)

Load

the

cassette

tape

(MC-10C)

provided

with

a

mirror

and

play

it.

2)

Adjust

the

adjustment

screw

so

that

the

clearances

between

the

tape

guide

attached

to

the

ERASE

head

and

the

tape

will

be

even

for

the

upper

and

lower

sides.

3)

On

completion

of

adjustment,

apply

screw-lock

paint

to

the

screw.

Be

sure

to

make

perfect

adjustments

as

“wrinkles”

and

“creases’’

may

develop

on

the

tape

surface

when

adjust-

ment

is

insufficient.

Tape

guide

Erase

head

Sr

Equalize

clearance

es

Tape

MC-8000

|

ADJUSTMENT

INSTRUCTION.....Circuitry

Section

of

Cassette

Deck

1)

Audio

Generator

.20Hz

to

20kHz

5)

Frequency

Counter

6)

Oscilloscope

2)

Attenuator

.....

0

to

90dB,

in

0.1

or

0.5dB

step

7)

Test

Tapes

3)

AC

Voltmeter

..

.F

res.;

20

to

100kHz

or

more,

MTT-111;3kHz,

.

.for

tape

speed

adjustment

R

in;

not

less

than

100kQ

MCT-400L:400Hz

.for

Normal,

Dolby

NR

level

and

Sens.;

-60dB(V)

or

better

Meter

indication

4)

Tester.........

20k2/V

MCT-600SA

...

.for

“Special”

bias

current,

blank

Adjustment

of

Playback

Mode

Adjustment

:

Measuring

Adjustment

Method

Ese

|

coe

VR601

|

C616

put

of

within

580

mV

+

25dB.

Meter

Level

meter

Play

Test

Tape

MCT-400L

and

adjust

for

a

level

meter

indication

of

within

Indication

0

dB

+

0.5dB.

Adjustment

of

Recording

Mode

For

the

following

adjustments

insert

a

10022

resistor

‘between

the

head’s

minus

terminal

and

head

lead’s

minus

terminal

during

recording’,

and

use

it

as

the

measuring

points.

iseren

Adjustment

Method

Cen

Bias

T481

Both

ends

of

Put

the

set

in

the

no-signal

recording

mode.

frequency

10022

resistor

Adjust

for

a

frequency

counter

reading

of

85

kHz.

Bias

VR481

|

Both

ends

of

With

the

set

in

the

no-signai

recording

mode,

adjust

so

that

the

output

current

VR482

|

10022

resistor

voltage

will

be

51

mV

(510uA),

i.e.,

standard

voltage.

VR501

|

C516

Play

Test

Tape

MCT-400L

(400Hz,

Dolby

NR

level)

and

adjust

for

an

out-

put

Level

Connect

AC

Take

out

the

inserted

100Q

resistor

and

connect

it

in

the

normal

man-

voltmeter

to

ner.

LINE

OUT

Put

the

set

in

the

“specified

recording’

mode

by

applying

400

Hz

signals

to

the

LINE

IN

terminal.

With

the

signal

level

at

the

LINE

IN

terminal

lowered

by

30

dB,

record

the

signals

on

Test

Tape

MCT-GO6SA.

Under

the

same

conditions,

record

6.3

kHz.

Confirm

so

that

the

leve!

of

6.3

kHz

will

be

within

+0.5

dB,

—O

dB

with

reference

to

400

Hz

when

the

tape

is

played.

If

this

value

cannot

be

obtained,

adjust

the

“standard

voiltage’’

and

reconfirm.

Recording;

VR504

|

Both

ends

of

Put

the

set

in

the

“specified

recording”

mode

and

stop

the

bias

oscillator.

current

VR604

|

1002

resistor

With

the

Tape

selector

set

to

“SPECIAL”,

set

to

the

“standard

voltage”,

of

5.8mV

(58uA).

Connect

AC

Take

out

the

inserted

1002

resistor

and

connect

it

in

the

normal

man-

voltmeter

to

ner.

LINE

OUT

After

putting

the

set

in

the

“specified

recording”

mode

by

applying

terminal

400

Hz

signals

to

the

LINE

IN

terminal,

lower

the

signal

level

at

the

LINE

IN

terminal

by

30

dB

and

record

the

signals

on

Test

Tape

MCT

606SA.

When

the

tape

is

played

back,

the

level

should

be

the

same

as

that

during

monitor

(SOURCE).

!f

the

levels

do

not

agree,

adjust

the

“standard

voltage’

and

reconfirm.

Peaking

L503

Both

ends

of

Put

the

set

in

the

“‘specified

recording”

mode

and

stop

the

bias

oscil-

L603

1002

resistor

lator.

Lower

the

level

at

the

LINE

IN

terminal

by

10

dB.

Alternately

apply

400

Hz

and

10

kHz

signals

to

the

LINE

IN

terminal

and

adjust

so

that

the

level

of

10

kHz

will

be

within

+0.5,

—O

dB

with

reference

to

400

Hz.

*

“Specified

recording’’

Mode

The

“specified

recording”

mode

is

the

mode

obtained

by

applying

the

rated

input

level

(-10dB)

signals

to

the

input

terminal,

and

then

adjusting

the

recording

level

contro!

knob

so

that

the

rated

output

level

(—7

dB)

will

be

obtained

at

the

output

terminal.

-~10—