Technics RS-M14 Manuel utilisateur

ORDER

NO.

ARD-8004036C

Service

Manual

Cassette

Deck

RS-M14

(

Silver

load

Black

Face

Metal

Tape

Compatible

Stereo

Cassette

Deck

with

Peak-Hold

FL

Meters,

Soft-Touch

Controls

and

Rewind

Auto-Play

Convenience

DO

[sacevavsrem)

This

is

the

Service

Manual

for

the

following

areas.

wees

For

all

European

areas

except

United

Kingdom.

s+

For

United

Kingdom.

cei

ass

For

Asia,

Latin

America,

Middle

East

and

Africa

areas.

Al

see

sires

For

Australia.

a

For

Asian

PX.

naib

ants

For

European

PX.

RS-M24

MECHANISM

SERIES

Specifications

Track

system:

4-track

2-channel

stereo

recording

and

playback

Outputs:

LINE;

output

level

420

mV,

output

impedance

Tape

speed:

4.8cm/s

1.5kQ

or

less,

load

impedance

22kQ

over

Wow

and

flutter:

0.05%

(WRMS),

+0.14%

(DIN)

oh

output

level

80mV,

load

imped-

;

2

ance

Prequeney

esponces

Metal

Tapes

oe

na

+

(DIN)

Rec/Pb

connection:

5P

DIN

type;

CrOo/Fe-Cr

tape:

20-18

000Hz

input

sensitivity

0.25

mV,

impedance

5.3kQ

:

pe;

3016

O00Hz

(DIN)

output

level

420

mV,

impedance

5.2kQ

Normal

tape:

20—17,000Hz

Bias

frequency:

80

kHz

30—15,000Hz

(DIN)

Motor:

Electrical

DC

governor

motor

Signal-to-noise

ratio:

Dolby

NR

in;

67

dB

(above

5kHz)

Heads

:

2-head

system;

1-MX

head

for

record/playback

Dolby

NR

out:

57

dB

(signal

level=max.

record-

i

disubiecera

tents

heatl

tov

amseults

ing

level,

Fe-Cr/CrOz

type

tape)

Fast

forward

and

Power

requirements:

AC;

110/125/220/240V,

50-60Hz

rewind

time:

Approx.

90

seconds

with

C-60

cassette

tape

Power

consumption:

15

W

(for

European

areas

and

Australia)

Inputs:

MIC;

sensitivity

0.25

mV,

input

impedance

25kQ

13

W

(for

Asia,

Latin

America,

Middle

East,

Africa

over

applicable

microphone

impedance

4002—

areas

and

PX.)

Dimensions:

43,0cm(W)

X

11.9cm(H)

x

24.6cm(D)

LINE;

sensitivity

60mV,

input

impedance

40kQ2

Weight:

4.3kg

Specifications

are

subject

to

change

without

notice.

*

‘Dolby’

and

the

double-D

symbol

are

trademarks

of

Dolby

Laboratories.

@

Panasonic

Tokyo

ec

|

2

1CS

Matsushita

Electric

Industrial

Co.,

Ltd.

Matsushita

Electric

Trading

Co.,

Ltd.

17-15,

6-chome,

Shinbashi,

Minato-ku,

Tokyo

105

Japan

P.O.

Box

288,

Central

Osaka

Japan

RS-M14

CONTENTS

ITEM

|

PAGE

LOCATION

OF

CONTROLS

AND

COMPONENTS

certsssttestresteteeteeteeteceestectecteetaeenseeseesenes

{

DISASSEMBLY

INSTRUCTIONS

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esiguaiuy

tant

mete

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aie

2

DISASSEMBLY

NOTES

(MECHANISM

UNIT)

ccccccssrsscreeteeeceeceeetseeccteceessesecceseeeenseresseeas

3

ASSEMBLY

INSTRUCTIONS:

se:

s2ssssee2sssais

coscsssnasgencmeseersanancs

sas

anos

cemncmemonscemaeananmaeacneas

4

ADJUSTMENT

PARTS

LOGATION:

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enahG

ules

weneamerelnor

5

MEASUREMENT

AND

ADJUSTMENT

METHODS

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6

ELECTRICAL

PARTS

LOCATIONicecssisectivctieniges

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saumemes

Nace

sarteeatsins

dwar

aumneta

nents

8

SCHEMATIC

DIAGRAM

i

aetiwnnesimnrewswansnaniaeieis

dafaites

son

teaismesines

sales

enmebebc@uarmsacdcos@hessunntunlnenes

9

WIRING

CONNECTION

DIAGRAM

AND

CIRCUIT

BOARDS

'::+erseccereeceeceeteecenteeeeeeeaeeneees

10

EXPLODED:

VIEWS

sitatiasiccotsssnssaadicaine

sesasn

anions

seam

agicuadatltianinemeiusnbpiinedanaetnaanmrameasnedensawen

11

MECHAMICAL

PARTS.

LGGATION.

ssseseswizssech

caasecaqnessetagatinns

dhep

ease

baieiaiescmeaninsesmenanaec

sanaes

11

CABINE

TH

PARTS

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a

Mn

wats

smote

cats

Turisiaenats

sol

aismutatn

dete

aieloaamobmnainainewinaeatian’

dels

13

LOCATION

OF

CONTROLS

AND

COMPONENTS

@

Power

switch

@

Cassette

holder

@®

_

Headphones

jack

@

Eject

button

®

Record

button

©

Rewind/review

button

@

Fast

forward/cue

button

Playback

button

@

Stop

button

Pause

button

@

Input

selector

@

Dolby

noise-reduction

switch

@)

Tape

selector

(tape

select-normal/Fe-Cr/CrO2/metal)

Record

muting

button

@®

Input

level

controls

Tape

counter

and

reset

button

@

Record

indication

lamp

FL

(fluorescent

level)

meter

Microphone

jacks

@

Line

output

jacks

@)

Record/playback

connection

socket

@

Line

input

jacks

@

Voltage

selector

RS-M14

DISASSEMBLY

INSTRUCTIONS

*

The

head

azimuth

can

be

adjusted

by

removing

the

(C)

cassette

lid.

To

remove

——

. :

|

Shown

in

fig.

——.

Case

cover

°

4

screws

3

—

Bottom

cover

°

3

screws

*

2

control

knobs

Front

panel

°

Cassette

lid

°

4

screws

WwW]

ks

&

ol

°

4

red

screws

°

Tape

select

knob

*

3

push

buttons

°

4

screws

Main

circuit

board

¢

Cassette

holder

°

2

black

screws

¢

4

screws

Chassis

cover

assembly

and

mechanism

unit

CO}INNNINNN®D

Operation

button

assembly

°

2

screws

RS-M14

DISASSEMBLY

NOTES

©

Precautions

for

removal

of

the

motor

When

removing

the

motor,

follow

the

procedure

given

below.

1.

Remove

screw

(A),

and

then

detach

flywheel

retainer

(M44)

by

pulling

it

in

the

direction

of

the

arrow

as

in

fig.

9.

2.

After

removing

screws

(B),

detach

takeup

belt

(M78)

and

capstan

belt

(M76),

and

then

sub

chassis

assembly

(M72)

can

be

rernoved.

(fig.

9,

10)

3.

When

screws

(C)

is

removed

after

detaching

fast

forward

belt

(M77),

motor

assembly

(M71)

can

be

removed.

(fig.

10)

Fast

Forward

Belt(M77)

Screw(C)

Sez"

2

|

iy

ee

Tews

Sub

Chassis

Assembly

(M72)

Fig.

10

©

Head

base

plate

(M57)

and

upper

base

plate

(M83)

removing

procedure

1.

With

screw

(D)

removed,

head

base

plate

pressure

spring

(M66)

can

be

detached.

In

this

case,

take

care

not

to

lose

steel

ball

(M65).

(fig.

11)

2.

With

head

release

spring

(M68)

removed,

head

base

plate

(M57)

can

be

detached.

(fig.

11,

12)

In

this

case,

take

care

not

to

lose

steel

ball

(M65)

and

roller

(M64).

3.

After

removing

pressure

roller

release

spring

(M25),

remove

pressure

roller

assembly

(M40).

(fig.

12)

4,

Remove

screw

(E),

and

then

upper

base

plate

(M83)

can

be

detached.

(fig.

12)

(MECHANISM

UNIT)

Sub

Chassis

Assembly

(M72)

Takeup

Belt

(M78)

Screw

(A)

Capstan

Belt

(M76)

/

Flywheel

Retainer(M44)

;

Flywheel

a

1

Retaimer

(m44)—

|

1

!

|

!

1

|

I

|

!

Head

Base

Plate

Pressure

Spring(M66)

Head

Base

Plate(M57)

|

Screw(D)

Steel

Ball(M65)

Head

Release

Spring(M68)

Fig.

11

Steel

Ball(M65)

Roller(M64)

Pressure

Roller

Release

Spring

(M25)

Upper

Base

Plate(M83)

Screw(E)

Pressure

Roller

Assembly

(M40)

Fig.

12

MECHANISM

SECTION

1.

For

repair,

measurement

or

adjustment

with

the

mechanism

removed

from

the

unit

be

sure

to

ground

the

lower

base

plate

of

the

mechanism.

2.

For

grounding,

connect

a

extension

cord

to

the

mechanism's

lower

base

plate

and

the

Lug

terminal

from

main

circuit

board.

3.

Without

grounding,

the

amplifier

does

not

operate

properly.

Fig.

13

ASSEMBLY

INSTRUCTIONS

;

Capstan

Belt

(M76)

e

Belt

mounting

Fast

Forward

Belt

(M77)

Takeup

Belt

(M78)

Check

that

each

belt

is

free

of

damage

or

grease

on

the

surface,

after

that,

set

the

belt

as

illustrated,

and

mount

it

on

the

lower

base

plate

(M84)

after

that,

set

the

takeup

belt

(M78)

on

the

fast

forward

connection

pulley

assembly

(M82).

é

Fig.

14

@

Positioning

the

takeup

reel

table

assembly

1

RS

dakodties

Detection

Lever

M50:

Takeup

Reel

When

installing

the

takeup

reel

table

assembly,

be

sure

to

Table

Assembly

mount

the

auto-stop

friction

hub

(shown

in

fig.

16),

as

illustrated

in

fig.

15.

If

the

takeup

reel

table

is

positioned

incorrectly

at

any

place

other

than

that

shown

in

fig.

15,

the

auto-stop

mechanism

remains

operative

at

all

times.

Auto-Stop

Auto-Sto

. .

i

Pp

Friction

Hub

Friction

Hub

Fig.

16

@

How

to

install

the

flywheel

retainer

PAS

WAS

REbAIRE

1.

Insert

the

thrust

retainer

into

the

hole

@)

of

the

flywheel

Hole

®

retainer

as

shown

in

fig.

17.

2.

Hold

the

thrust

retainer

with

the

thumb

as

shown

in

;

fig.

18.

GS

)

Thrust

Retainer

Flywheel

Hold

this

part

with

the

thumb

Fig.

17

Fig.

18

3.

Engage

the

parts

@)

and

©

of

the

flywheel

retainer

with

the

lower

base

plate

as

shown

in

fig.

19.

4.

Shift

down

the

flywheel

retainer,

supported

at

points

©,

in

the

direction

of

the

arrow

as

illustrated.

(fig.

20)

5.

Attach

the

screw

(A)

in

the

position

as

shown

in

fig.

9.

e

Mounting

the

operation

button

assembly

Before

mounting

the

operation

button

assembly

on

the

mechanism

body,

be

sure

to

lift

the

main

control

lever

in

the

direction

of

the

arrow

using

a

screwdriver,

as

shown

in

fig.

21,

until

it

locks

in

place.

M8:

Main

Control

Lever

Hub

of

the

Playback

Button

Assembly.

Screwdriver

If

it

is

not

mounted

in

this

manner,

the

hub

of

the

playback

—

button

assembly

during

playback

catches

on

the

main

control

lever,

making

it

impossible

to

release

playback

mode.

Spt

eOM

EET

ON

Meaty

Fig.

21

Tape

Speed

Adjustment

VR.

TP3

TP4

TP2 TP5 TP6

TP8~

TP7

VR7

VR8&

TPl

L2

L1

VR6

tp

ii.

%

i

\

R6

6)

/

ee

poe

ra

Ss

TP9

TP10

/

TP12

4

R62!

VR5

VR402

VR1

VR2

VR401

NY

F

5

Fig.

22

MEASUREMENT

AND

ADJUSTMENT

METHODS

NOTES:

Keep

good

condition,

set

lever

switches

and

controls

in

the

following

positions,

unless

otherwise

specified.

@

Make

sure

heads

are

clean.

@

Make

sure

capstan

and

pressure

roller

are

clean.

©

Judgeable

room

temperature:

20-£5°C

(68+9°F)

e

Dolby

NR

switch:

OUT

ITEM

MEASUREMENT

&

ADJUSTMENT

®

Head

position

adjustment

Condition:

*

Playback

and

pause

mode

®

Head

azimuth

adjustment

Condition:

*

Playback

mode

Equipment:

*VTVM

—

*

Oscilloscope

*

Test

tape

(azimuth)

---QZZCFM

*

Test

tape

(tape

path

viewer)

@

Tape

speed

Condition:

*

Playback

mode

Equipment:

*

Digital

electronic

counter

or

frequency

counter

*

Test

tape

---

QZZCWAT

“2.

Playback

this

tape.

®

Tape

selector:

Normal

position

@

Input

selector:

Line

in

@

Input

level

controls:

Maximum

Screw

(A)

—

Head

Adjusting

Plate

Capstan

)

(B)

4

Pressure

Roller

(The

head

adjusting

plate

is

provided

to

adjust

the

tape

touch

of

the

head

in

cue

or

review

mode.)

1.

Press

the

playback

button

and

pause

button.

2.

Measure

the

space

between

the

pinch

roller

and

the

capstan.

Standard

value:

0.5+0.3mm

Space

(adjustable)

3.

If

the

measured

value

is

not

within

the

standard

value,

untighten

screw

(A),

and

slide

the

head

adjusting

plate

in

the

direction

of

arrow

(B)

for

adjustment.

Record/playback

head

azimuth

adjustment

1.

Test

equipment

connection

is

shown

in

fig.

24.

2.

Playback

azimuth

tape

(QZZCFM

8

kHz).

3.

Adjust

record/playback

head

angle

adjustment

screw

(B)

LINE

OUT

Playback

mode

VTVM

Oscilloscope

in

fig.

25

so

that

output

level

at

LINE

OUT

becomes

“*™*

Fig.

24

maximum.

4.

Measure

both

channels,

and

adjust

levels

for

equal

output.

5.

After

adjustment

lock

head

adjustment

screw

with

lacquer.

Record/playback

mode

Erase

head

Erase

head

azimuth

adjustment

1.

Test

equipment

connection

is

the

same

above

but

use

the

tape

path

viewer

(QZZCRD)

instead

of

test

tape

(QZZCFM).

fh

fe

(B)

Fig.

25

Fig.

26

3.

Adjust

screw

(C)

shown

in

fig.

26

so

that

the

tape

may

not

get

curled

or

malformed

by

tape

guide

of

the

erase

head.

.

After

adjustment,

lock

head

adjust

screw

with

lacquer.

Tape

speed

accuracy

1.

Test

equipment

connection

is

shown

in

fig.

27.

2.

Playback

test

tape

(QZZCWAT

3,000Hz),

and

supply

playback

signal

to

frequency

counter.

3.

Measure

this

frequency.

4.

On

the

basis

of

3,000Hz,

determine

value

by

following

formula:

Test

tape

Playback

mode

Digital

electronic

counter

Fig.

27

f

—

3,000

.

Take

measurement

at

middle

section

of

tape.

Tape

speed

accuracy

=

x

100(%)

where,

f=

measured

value

Standard

value:

1.5%

Adjustment

method

1.

Playback

the

test

tape

(middle).

2.

Adjust

so

that

frequency

becomes

3,000

Hz.

3.

Tape

speed

adjustment

VR

shown

in

fig.

22.

ITEM

MEASUREMENT

&

ADJUSTMENT

®

Playback

frequency

response

Condition:

*

Playback

mode

*

Tape

selector

~

++»Normal

position

Equipment:

*VTVM

—

*

Oscilloscope

*

Test

tape---

QZZCFM

@

Playback

gain

Condition:

*

Playback

mode

*

Tape

selector

---

Normal

position

Equipment:

*VTVM

—

*

Oscilloscope

*

Test

tape---

QZZCFM

Tape

speed

fluctuation

Make

measurements

in

same

manner

as

above

(beginning,

middle

and

end

of

tape),

and

determine

the

difference

between

maximum

and

minimum

values

and

calculate

as

follows:

f=

F2_

5

100

(96)

—————

f1=maximum

value,

f2

=

minimum

value

3,000

Tape

speed

fluctuation

=

Standard

value:

Less

than

1%

Note:

Please

use

non

metal

type

screwdriver

when

you

adjust

tape

speed

accuracy

on

this

unit.

Pe

Playback

frequency

response

chart

12.5kHz

1.

Test

equipment

connection

is

shown

in

fig.

24.

2.

Place

UNIT

into

playback

mode.

3.

Playback

the

frequency

response

test

tape

(QZZCFM).

.

Measure

output

level

at

315Hz,

12.5kHz,

8kHz, 4kHz,

1kHz,

250Hz,

125Hz

and

63

Hz,

and

compare

each

output

level

with

the

standard

frequency

315

Hz,

at

LINE

OUT.

.

Make

measurement

for

both

channels.

.

Make

sure

that

the

measured

value

is

within

the

range

specified

in

the

frequency

response

chart.

63Hz

125Hz

200Hz

500Hz

1KHz

500Hz

1kHz

Fig.

28

63Hz125Hz

200

Hz

.

Test

equipment

connection

is

shown

in

fig.

24.

.

Playback

standard

recording

level

portion

on

test

tape

(QZZCFM

315Hz),

and

using

VT

VM

measure

the

output

level

at

LINE

OUT.

.

Make

measurement

for

both

channels.

|

Standard

value:

around

0.39V

Adjustment

1.

If

measured

value

is

not

within

standard,

adjust

VR1

(L-CH),

VR2

(R-CH)

(See

fig.

22

on

page

5).

2.

After

adjustment,

check

“Playback

frequency

response”

again.

@

Bias

leakage

Condition:

*

Record

mode

*

Input

level

controls

---

MAX

*

Tape

selector

--»

Metal

position

Equipment:

*VTVM

—

*

Oscilloscope

@

Erase

current

Condition:

*

Record

mode

*

Tape

selector

--»

Metal

position

Equipment:

*VTVM

—

*

Oscilloscope

1.

Test

equipment

connection

is

shown

in

fig.

29.

page

2.

Place

UNIT

into

record

mode.

3.

Adjust

trap

coil

L1

(L-CH),

L2

(R-CH)

so

that

measured

value

on

VTVM

becomes

minimum.

4.

Take

adjustment

for

both

channels.

TPS(L-CH)

Record

/playback

head

Record

mode

Fig.

29

Vtvm_

Oscilloscope

1.

Test

equipment

connection

is

shown

in

fig.

30.

2.

Press

the

record

and

pause

buttons.

3.

Set

the

tape

selector

to

metal

position.

4.

Read

voltage

on

VT

VM

and

calculate

erase

current

by

following

formula:

Erase

head

Voltage

across

both

ends

of

R301

1(Q)

Era

rrent

(A)

=

VIVM

Oscillos

se

curre

t

(

)

VTVM

Oscilloscope

Fig.

30

Standard

value:

155+15mA

(Metal

position)

|

5.

If

measured

value

is

not

within

standard,

adjust

as

follows.

Adjustment

1.

Open

the

point

(A)

and

short

the

point

(B)

on

the

main

circuit

board

in

the

wiring

connection

diagram

(See

page

10).

Ee

he

ae

ITEM

MEASUREMENT

&

ADJUSTMENT

2.

Make

measurement

for

erase

current.

3.

Make

sure

that

the

measured

value

is

within

the

erase

current

of

140mA

to

170

mA.

4.

lf

it

is

beyond

the

value,

carry

out

the

following

adjustments:

@®

Bias

current

Condition:

*

Record

mode

*

Tape

selector

--

Normal

position

--Fe-Cr

position

--CrOz

position

--

Metal

position

Equipment:

*VTVM

*

Oscilloscope

@

Overall

gain

Condition:

*

Record/playback

mode

*

Input

level

controls

---

MAX

*

Standard

input

level;

MIC

+++++++-

—72+4dB

LINE

IN---

—-2444dB

Equipment:

*VTVM

*

AF

oscillator

*

ATT

*

Oscilloscope

*

Resistor

(600

2)

*

Test

tape

(reference

blank

tape)

--QZZCRA

for

Normal

®

Overall

frequency

response

Condition:

*

Record/playback

mode

*

Tape

selector

--

Normal

position

--Fe-Cr

position

--CrO2

position

--

Metal

position

*

Input

level

controls

---

MAX

Equipment:

*VTVM

*

AF

oscillator

*

ATT

*

Oscilloscope

*

Resistor

(600

2)

*

Test

tape

(reference

blank

tape)

--QZZCRA

for

Normal

--QZZCRY

for

Fe-Cr

--QZZCRX

for

CrOz

--QZZCRZ

for

Metal

.

Test

equipment

connection

is

shown

in

fig.

31.

.

Place

UNIT

into

record

mode,

and

tape

selector

to

normal

.

Read

voltage

on

VT

VM

and

calculate

bias

current

by

4

3;

6

Note:

Before

measuring

and

adjusting,

make

sure

of

the

playback

frequency

response

(For

the

.

Place

UNIT

into

record

mode,

and

tape

selector

to

normal

p

°

If

the

erase

current

is

less

than

140

mA,

short

the

point

(A).

°

If

the

erase

current

is

more

than

170mA,

open

the

points

(A)

and

(B).

VR7

(L-CH)

VR8

(R-CH)

oa

Record/playback

head

position.

Record

mode

TP1(L-CH)

;

TP2IR-CH)

R1

(L-CH)

R2

(R-CH)

following

formula:

Value

read

on

VTVM

(V)

VTVM_

Oscilloscope

10

(Q)

Bias

current

(A)

=

Fig.

31

Standard

value:

around

410A

(Normal

position)

:

.

If

measured

value

is

not

within

standard,

adjust

VR7

(L-CH)

and

VR8

(R-CH)

(See

fig.

22

on

page

5).

Set

the

tape

selector

to

each

position.

.

Make

sure

that

the

measured

value

is

within

standard.

Standard

value:

around

440A

(Fe-Cr

position),

around

545A

(CrO2

position),

around

800A

(Metal

position)

est

equipment

connection

is

shown

in

fig.

32.

Kasnitiaiies

head

i

osition.

.

Supply

1kHz

signal

(—24dB)

from

AF

oscillator,

through

ATT

to

LINE

IN.

djust

ATT

until

monitor

level

at

LINE

OUT

becomes

Record/playback

39V.

head

Record

mode

Test

tape

AF

oscillator

A

0.

.

Using

test

tape,

make

recording.

.

Playback

recorded

tape,

and

make

sure

-

value

at

LINE

—7

dB).

.

If

measured

value

is

not

0.39

V,

adjust

VR5

(L-CH),

VR6

(R-CH)

(See

fig.

22

on

page

5).

.

Repeat

from

step

(2).

Playback

mode

yTVM

Oscilloscope

Fig.

32

OUT

on

VTVM

becomes

0.39

V

(

Test

tape

Overall

frequency

response

chart

(Normal)

10kHz

seit

100s

640

Hz

2kHz

4kHz

method

of

measurement,

please

refer

to

the

playback

frequency

response).

1.

2.

3.

.

Supply

1kHz

signal

from

AF

oscillator

.

Record

each

frequency

1

kHz,

50Hz,

Test

equipment

connection

is

shown

in

fig.

32.

Place

the

normal

test

tape

(QZZCRA)

in

the

cassette

holder.

Place

UNIT

into

record

mode,

and

tape

selector

to

normal

position.

:

100Hz

Fig,

Hz

2kHz

33

50Hz

Overall

ee

response

chart

(Fe-Cr,

CrO2,

Metal)

2kHz

12kHz

through

ATT

to

LINE

IN.

200

Hz

640

Hz

.

Adjust

ATT

so

that

input

level

is

—20dB

below

standard

recording

level

(standard

recording

level=0

VU).

.

At

this

time,

LINE

OUT

level

indicates

0.039V.

200

Hz.

640

Hz

200Hz,

4kHz,

8kHz

and

10kHz

(12kHz

Fig.

34

for

Fe-Cr,

CrOz

and

metal).

mee

50Hz

.

Playback

and

express

in

dB

the

difference

between

‘plavbaek

output

level

of

each

frequency

based

on

playback

output

level

of

1

kHz.

.

Make

sure

that

the

measured

value

is

within

the

range

specified

in

the

overall

frequency

response

chart

(Shown

in

fig.

33).

.

Change

test

tape

to

Fe-Cr

(QZZCRY),

CrO2

(QZZCRX)

and

metal

(QZZCRZ).

.

Set

the

tape

selector

to

each

position.

.

Measure

in

the

same

manner

from

step

(3)

to

step

(8).

.

Make

sure

that

the

measured

value

is

within

the

range

specified

in

the

overall

frequency

response

chart

for

Fe-Cr,

CrO2

and

metal

tape

(Shown

in

fig.

34).

Adjustment

—

Using

bias

current

1.

When

the

frequency

response

between

the

middle

and

high

frequency

range

becomes

higher

than

the

standard

value,

as

*

shown

by

the

solid

line

in

fig.

35’

increase,

refer

to

bias

current

adjustment.

.

When

it

becomes

lower,

as

shown

by

dotted

line,

refer

to

bias

current

adjustment.

Note:

For

the

method

of

bias

current

measurement,

refer

to

“Bias

current

adjustment”

on

page

8.

1kHz

=

2kHz

;

8kHz

12kHz

@

Fluorescent

meter

.

Test

equipment

connection

is

shown

in

fig.

32.

Condition:

.

As

shown

in‘tig.

36,

connecting

the

base

of

Q402

and

*

Record

mode

ground

stops

the

oscillation

of

the

astable

multivibrator

*

Input

level

controls

---

MAX

comprising

Q402

and

Q403.

*

Tape

selector

.

Supply

1kHz

signal

(—24

dB)

to

the

LINE

IN

then

press

.--

Normal

position

the

record

button.

.

Adjust

the

ATT

so

that

the

output

level

at

LINE

OUT

becomes

0.39V

(The

input

level

at

this

condition

is

termed

the

standard

input

level).

.

Adjustment

at

“—20

dB”:

A.

Adjust

the

ATT

so

that

the

input

level

is

—20dB

below

standard

recording

level.

ao

B.

Adjust

VR401

so

that

the

—20dB

segment

at

ights

up

in

the

~200.8dB

range

(L-CH

—.

SU/IIIMIUIIIIIIIIIIIIIIIIIIIIIIUIIUI1111111111HIHI1

only)

(See

fig.

37).

ray

.

Adjustment

at

“OdB”:

2

6+

4°25

0

2

00

+66

A.

Adjust

the

ATT

so

that

the

output

level

at

Fig.

37

LINE

OUT

becomes

0.39

V.

ei

scence

(The

input

level

at

this

condition

is

termed

MYTYTETTYYT

TTY

=

(+108)

the

standard

input

level.)

STMT

UU

MT

.

Adjust

VR402

so

that

the

+1dB

segment

a;

el

a

oe

ak

an

lights

up

in

the

O+0.2dB

range

of

the

pan

lhe

abated

standard

input

level

(See

fig.

38).

":

.

Repeat

twice

between

steps

(5)

and

(6)

above.

Mmm

ccc

cece

.

Adjust

ATT

and

check

that

all

segments

lights

shaven

asuaaaviasiauiatas

Sarasa

up

when

an

input

signal

level

is

increased

to

STILT

ATLA

UU

10

dB

higher

than

the

standard

input

level

(See

20

PEAK)

6

*

42+

20

2

(«6

8»

(1048)

Equipment:

*VTVM

—

*

AF

oscillator

*

ATT

*

Resistor

(600Q)

@

Dolby

NR

circuit

.

Test

equipment

connection

is

shown

in

fig.

40.

Condition:

.

Place

UNIT

into

record

mode,

set

the

Dolby

NR

switch

*

Record

mode

to

OUT

position

and

supply

to

LINE

IN

to

obtain

*

Dolby

NR

switch

---

IN/OUT

—34.5dB

at

TP11

(L-CH),

TP12

(R-CH)

(frequency

cron

TPL

CH)

*

Input

level

controls

---

MAX

5kHz).

ae

ea

.

Confirm

that

the

value

at

IN

position

is

8(+2.5)dB

LINE

IN

[X

(ieee

Equipment:

se

Q

fee

aa

ter

than

the

value

at

OUT

position

of

Dolby

NR

1

*VTVM

+

AF

oscillator

a.

P

y

SOL

OOOO

OQ.

*

ATT

*

Oscilloscope

:

AF

oscillator

ATT

Record

mode

©

VTVM

*

Resistor

(600

Q)

Fig.

40

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