Yamaha K-200 User manual

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/*\

STEREO

CASSETTE

DECK

SERVICE

MANUAL

■

FRONT

PANEL

©

Power

Switch

(POWER)

Eject

Button

(EJECT)

©

Cassette

Holder

©

Tape

Counter/Reset

Button

(TAPE

COUNTER/RESET)

©

Rewind

Button

(

«

)

©

Play

Button

(

>

)

©

Fast-Forward

Button

(

W>

)

©

Stop

Button

(

□

)

'?•

Record-Standby/Pause

Button

(R

EC/PAUSE)

Record-Muting

Button

(MUTE)

S

VU

Level

Meters

(LEVEL)

©

Tape

Selector

Switches

(TAPE)

Q

Dolby

NR

Switch

(DOLBY

NR)

■

J

Headphone

Jack

(PHONES)

^

Microphone

Jacks

(MIC)

Record

Level

Control

(REC

LEVEL)

■

C

ONTENTS

Rear

Panel.

Names

of

the

Parts.

Disassembly

Instructions

.

General

Adjustments.

Specifications

....

Block

Diagram

....

..

Performance

Chart

for

Mechanism

Logic...

Printed

Circuit

Board

Pattern-side

Layout.

Printed

Circuit

Board

Parts-side

Components

Layout/Wiring

Schematic

Diagram.

.

.

.

....

1

..

2

.

3

.

4

.

7

..

.

7

...

8

..

.

10

..

.

.

.

11

..

.

.

.

12

SINCE

1887

H

YAMUHA

NIPPON

GAKKI

CO.,

LTD.

HAMAMATSU.

JAPAN

Printed

in

Japan

5.82

erj

<&)

2

.

65K

@

Record

Input

Jacks

(LINE

IN/REC)

©

Playback

Output

Jacks

(LINE

OUT/PLAY)

©

Power

Cord

Australian

and

British

Models

European

Model

General

Model

1

■

N

A

MES

OF

THE

PARTS

Top

View

©

Power

transformer

Power

cord

@

Main

circuit

board

(2)

Q

Main

circuit

board

(1)

©

Auto-Shut

off

solenoid

©

Capstan

drive

motor

©

Transport

mechanism

TM-5A

©

Reel

drive

motor

©

Main

circuit

board

(3)

©

Switch

rods

©

VU

meters

2

Mat,

K-200

■

DISASSEMBLY

INSTRUCTIONS

1.

R

e

m

o

val

of

Top

Cover

Remove

screws

(T)

and

(g)

shown

in

photo

1

(4

screws

each

right

and

left)

and

remove

plastic

rivet

(5)

.

The

top

cover

can

now

be

removed.

2.

R

e

m

o

val

of

Bottom

Cover

Remove

screws

(T)

~

(§)

shown

in

fig

2,

and

remove

the

bottom

cover.

3.

R

e

m

o

val

of

Front

Panel

a)

Remove

the

top

and

bottom

covers

per

steps

1,

and

2.

b)

Remove

screws

(T)

~

(§)

shown

in

photo

3,

and

remove

the

front

panel.

4.

R

e

m

o

val

of

Transport

Mechanism

a)

Remove

the

front

panel

according

to

step

3.

b)

Remove

the

cassette

cover.

c)

Unplug

all

connectors

from

the

mechanism

section.

d)

Remove

screws

(T)

~

(?)

shown

in

photo

4,

and

remove

the

transport

mechanjsm.

5.

Removal

of

VU

Meters

a)

Remove

the

front

panel

according

to

step

3.

b)

Remove

screw

(T)

shown

in

photo

5,

and

remove

the

VU

meters.

6.

Removal

of

Circuit

Board

a)

Remove

the

top

and

bottom

covers

and

the

front

panel

according

to

steps

1,

2

and

3.

b)

Remove

screws

(

5

)

and

(§)

shown

in

photo

5.

c)

Remove

the

plastic

rivets

(A)

and

(§)

shov/n

in

photo

6.

d)

Remove

screw

(T)

shown

in

photo

7,

and

renove

plastic

rivets

(A)

~

(C)

.

e)

After

removing

all

switch

rods,

the

circuit

board

can

be

detached.

3

K

Photo

7

■

GENERAL

ADJUSTMENTS

Before

Adjustment

1.

Set

the

Dolby

NR

switch

to

OFF.

2.

As

dirty

or

magnetized

heads

can

deteriorate

measurement

results

for

various

parameters,

be

sure

to

perform

head

demagnetizing

and

head

cleaning,

especially

before

adjusting

frequency

response

or

head

azimuth.

Designated

Test

Tapes

TEAC.MTT-111

(3

kHz)

TEAC.MTT-212C

(160

nWb/m)

or

MTT-212

(250

nWb/m)

TEAC.MTT-114

(10

kHz)

TEAC.MTT-216

(3180+

120

jus)

or

MTT-316

(3180

+

70

us)

TDK

.SA

C-60

(Cr0

2

tape)

TDK

.ADC-60

(LH

tape)

TDK

.MA

C-60

(Metal

tape)

Playback

Adjustments

1.

Tape

Speed

Adjustment

a)

Connect

a

frequency

counter

to

the

left

or

right

channel

LINE

OUT.

b)

Play

test

tape

TEAC

MTT-111

(3

kHz)

and

adjust

the

semi-fixed

VR

in

the

drive

motor

base

for

a

frequency

counter

reading

of

3000

Hz

-

+

2°oHz.

MTT-HI

c

c

frequency

counter

5

P.B

LINE

OUT

OODO

O

:

OOOO

0

-

-

2.

Playback

Level

Adjustment

a)

Connect

a

VTVM

to

LINE

OUT.

b)

Play

test

tape

TEAC

MTT-212C

(160

nWb/m)

and

adjust

VR

101

(left

channel)

and

VR

102

(right

channel)

for

a

LINE

OUT

level

reading

of

—7±1

dBm

(346

mV).

3000

t

'5

Hz

K-200

3.

Head

Azimuth

Adjustment

a)

Remove

the

cassette

cover.

b)

Connect

two

VTVMs

and

an

oscilloscope

to

the

left

and

right

channels

of

LINE

OUT.

c)

Play

test

tape

TEAC

MTT-114

(10

kHz)

and

turn

the

R/P

head

azimuth

adjustment

screw

so

that

the

outputs

.of

both

left

and

right

channels

are

maximum,

equal,

and

in

phase.

d)

After

adjustment,

apply

screw

lock

paint.

4.

Playback

Frequency

Response

Check

a)

Connect

a

VTVM

to

LINE

OUT.

b)

Play

test

tape

TEAC

MTT-216

(3180

+

120

/is

:

LH)

or

MTT-316

(3180

+

70/ts

:

Cr0

2

)

and

confirm

that

the

10-kHz

reading

is

within

±3

dB

of

the

315-Hz

reading.

MTT-216

(MTT-316)

LINE

OUT

VTVM

Recording

Adjustments

1.

L

e

vel

Meter

Adjustment

a)

Connect

an

audio

oscillator

to

LINE

IN

and

a

VTVM

to

LINE

OUT.

b)

Put

the

deck

into

the

record

mode

and

apply

a

1-kHz

signal

to

LINE

IN

which

will

cause

—7

dBm

(346

mV)

at

the

LINE

OUT.

c)

Adjust

VR

105

(left

channel)

and

VR

106

(right

channel)

so

that

the

VU

meter

pointers

read

0

dB

±1.5

dB.

2.

R

ec

ord

Level

Adjustment

a)

Establish

the

same

connections

as

for

level

meter

adjustment,above.

b)

Put

the

deck

into

the

record

mode

and

apply

a

315-Hz

(1-kHz,

333-Hz)

signal

to

LINE

IN

which

will

read

-7

dBm

(346

mV)

at

LINE

OUT.

c)

Use

the

TDK

SA

C-60

Cr0

2

tape

and

record

this

signal.

d)

Adjust

VR

103

(left

channel)

and

VR

104

(right

channel)

so

that

the

recorded

signal

reads

-7

dBm

(346

mV)

upon

playback.

VTVM

OSClLLArOH

0

©fi

u

o

ooo

oc

p

e

\

UNCOUT

*

e:

-TaBm

t<

3.

C

h

e

ck

of

Recording

Bias

Current

*Set

the

DOLBY

NR

switch

to

OFF.

a)

Connect

an

audio

oscillator

to

LINE

IN

and

a

VTVM

and

distortion

meter

to

LINE

OUT.

b)

Apply

a

signal

to

LINE

IN

which

will

read

—27

dBm

(34.6

mV,

-20

VU)

at

LINE

OUT.

5

•

Cr0

2

Position

a)

Use

a

TDK

SA

C-60

Cr02

tape

and

adjust

VC

101

(trimmer

capacitor,

L

and

R)

so

that

the

14-kHz

record/playback

level

is

within

±3

dB

of

the

1-kHz

(315-Hz,

333-Hz)

record/playback

level.

b)

At

this

time,

distortion

at

315-Hz

(1-kHz,

333-Hz),

0

VU

must

be

below

2.5%.

•

LH

Position

a)

Use

a

TDK

AD

C-60

(LH)

tape

and

check

that

the

14-kHz

record/playback

level

is

within

±4

dB

of

the

315-Hz

(1-kHz,

333-Hz)

record/playback

level.

•

METAL

Position

a)

Use

a

TDK

MA

C-60

metal

tape

and

check

that

the

14-kHz

record/playback

level

is

within

±4

dB

of

the

315-Hz

(1-kHz,

333-Hz)

record/playback

level.

Location

of

Adjustment

Points

P.B

LEVEL

ADJUSTMENT

a

Cr02

BIAS

ADJUSTMENT

(L

«

(

R

)

(®)

VR104

//(«)

REC

LEVEL

ADJUSTMENT

(L)

(R)

!

□

METER

ADJUSTMENT

■

SPECIFICATIONS

Track

Configuration

....

4

track

,

2

channel

stereo

Motor

.

DC

servo

motor

(capstan)

Heads

Flat

torque

DC

motor

(reel)

.

.

Hard

permalloy

rec/play-

Tape

Speed.

back

head

Double-gap

ferrite

erase

head

.

4.75

cm/sec

Wow

and

Flutter

WRMS.

.

.

0.05%

DIN-45507

.

.

.

0.08%

Signal-to-Noise

Ratio

(Dolby

off,

Cr0

2

tape)

.

better

than

58

dB

(Dolby

on,

Cr0

2

tape)

.

better

than

66

dB

Frequency

Response

Normal

tape

(—20

dB)

.

40

~

15,000

Hz

±

3

dB

Cr0

2

tape

(—20

dB)

.

.

40

-

15,000

Hz

±

3dB

Metal

tape

(—20

dB)

40

~

15,000

Hz

±

3dB

(0

dB)

.

.

.

.

40

~

12,000

Hz

±

3dB

Overall

Distortion

Metal

tape.

.

.

less

than

1.0%

(315

Hz)

Channel

Separation

.

.

.

better

than

35

dB

(1

K

Hz)

Crosstalk

.

.

better

than

60

dB

(125

Hz)

Erasure

rate.

better

than

60

dB

(400

Hz)

Input

Sensitivity/Impedance

Mic

.

0

.

3

mV/5K

ohms

Line

.

6

0

mV/80K

ohms

Output

Level

Line

.

350

mV/2.2K

ohms

Phones

.

0

.

6mW/8

ohms

Power

Supply

.

A

C

120V,

60

Hz

(U,C)

AC

220V,

50

JHz

(G)

AC

240V,

50

Hz

(A,B)

AC

110/1

20/220/240

V,

50/60

Hz

(R)

^

Power

Consumption

......

14

W

Dimensions

(WxHxD)

.

.

.

.

435

x

11

2

x

278

mm

(17-1/8

x

4-13/32

x

11")

Weight

.

4

.

5

kg

(9.9

ibs)

Specifications

subject

to

change

without

notice.

TM

Dolby

Laboratories

Licensing

Corp.

U

:

U.S.A.

Model

C

:

Canadian

Model

R

:

General

Model

A

:

Australian

Model

B

:

British

Model

G

:

European

Model

■

BLOCK

DIAGRAM

7

K-2

IPERFORMANCE

CHART

FOR

MECHANISM

LOGIC

FWD

SW104

2

button

-»push

-

-

►

Cl78

charged

-

►

TRI

13

—

base

of

TR113

-

via

R202

“ON”

locked

by

D127

I

d

i

f

ferenti-

I

ation

at

C176|

1C

105

pin6

“H"

pin7

“L”

REEL

MOTOR

forward

drive

HEAD

plunger

operation

Dill

con¬

ductive

BRAKE

plunger

operation

TRI20I

“ON”

I

CAPSTAN

MOTOR

drive

voltage

to

TR

109,110

Auto

Shut-off

circuit

stand-by

TR

II

5

“OFF”

TRI

07,

108

►

“OFF”

Muting

circuit

released

REC

button-

►

push

SWIOI

SW

101

-

I,

3,

5,7,9

SW

101

-2,

4,6,8,

10

L.

ch;

recording

circuit

established

R.

ch.

recording

circuit

established

^

TRII5

TRI07,

108

SWI0M

1

“OFF”

“OFF”

Muting

circuit

released

REC

INDICATOR

lights

SW

101-12

voltage

to

TR117

Tape

Selector

circuit

operation

Record

Protection

Tab

present

missing

REC

IHN

SW

open

closed

1C

105

pin

14

“L”

“H”

1C

105

pin

15

“H”

“

L

”

voltage

to

TR

116

Recording

Bias

circuit

operation

Shut-off

plunger

"ON"

REC

button

lock

disabled

button

■

*

push

SW104-3

voltage

to

-

TR109.110

Auto

Shut*off

circuit

stand-by

REW

|

button

->

push

SW

104-1

TRI

13

“ON”

base

of

TR113

locked

by

D126

REEL

MOTOR

reverse

drive

voltage

to

-----^

TR109.110

Auto

Shut-off

circuit

stand-by

FF

(REW)I

mode

STOP

button

-PUSH

SW

104-4

|

charge

of

Cl79

released

BRAKE

plunger

operation

POWER

SW

SWI03