Yamaha K-200 Manual de usuario

/*\

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

(

)

Stop

Button

(

□

)

'?•

Record-Standby/Pause

Button

EC/PAUSE)

Record-Muting

Button

(MUTE)

Level

Meters

(LEVEL)

Tape

Selector

Switches

(TAPE)

Dolby

Switch

(DOLBY

NR)

■

Headphone

Jack

(PHONES)

Microphone

Jacks

(MIC)

Record

Level

Control

(REC

LEVEL)

■

ONTENTS

Rear

Panel.

Names

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.

....

...

SINCE

1887

YAMUHA

NIPPON

GAKKI

CO.,

LTD.

HAMAMATSU.

JAPAN

Printed

Japan

5.82

erj

<&)

65K

Record

Input

Jacks

(LINE

IN/REC)

Playback

Output

Jacks

(LINE

OUT/PLAY)

Power

Cord

Australian

and

British

Models

European

Model

General

Model

■

MES

THE

PARTS

Top

View

Power

transformer

Power

cord

Main

circuit

board

(2)

Main

circuit

board

(1)

Auto-Shut

off

solenoid

Capstan

drive

motor

Transport

mechanism

TM-5A

Reel

drive

motor

Main

circuit

board

(3)

Switch

rods

meters

Mat,

K-200

■

DISASSEMBLY

INSTRUCTIONS

val

Top

Cover

Remove

screws

(T)

and

(g)

shown

photo

screws

each

right

and

left)

and

remove

plastic

rivet

(5)

The

top

cover

can

now

removed.

val

Bottom

Cover

Remove

screws

(T)

(§)

shown

fig

and

remove

the

bottom

cover.

val

Front

Panel

Remove

the

top

and

bottom

covers

per

steps

and

Remove

screws

(T)

(§)

shown

photo

and

remove

the

front

panel.

val

Transport

Mechanism

Remove

the

front

panel

according

step

Remove

the

cassette

cover.

Unplug

all

connectors

from

the

mechanism

section.

Remove

screws

(T)

(?)

shown

photo

and

remove

the

transport

mechanjsm.

Removal

Meters

Remove

the

front

panel

according

step

Remove

screw

(T)

shown

photo

and

remove

the

meters.

Removal

Circuit

Board

Remove

the

top

and

bottom

covers

and

the

front

panel

according

steps

and

Remove

screws

(

)

and

(§)

shown

photo

Remove

the

plastic

rivets

(A)

and

(§)

shov/n

photo

Remove

screw

(T)

shown

photo

and

renove

plastic

rivets

(A)

(C)

After

removing

all

switch

rods,

the

circuit

board

can

detached.

Photo

■

GENERAL

ADJUSTMENTS

Before

Adjustment

Set

the

Dolby

switch

OFF.

dirty

magnetized

heads

can

deteriorate

measurement

results

for

various

parameters,

sure

perform

head

demagnetizing

and

head

cleaning,

especially

before

adjusting

frequency

response

head

azimuth.

Designated

Test

Tapes

TEAC.MTT-111

kHz)

TEAC.MTT-212C

(160

nWb/m)

MTT-212

(250

nWb/m)

TEAC.MTT-114

(10

kHz)

TEAC.MTT-216

(3180+

120

jus)

MTT-316

(3180

us)

TDK

.SA

C-60

(Cr0

tape)

TDK

.ADC-60

(LH

tape)

TDK

.MA

C-60

(Metal

tape)

Playback

Adjustments

Tape

Speed

Adjustment

Connect

frequency

counter

the

left

right

channel

LINE

OUT.

Play

test

tape

TEAC

MTT-111

kHz)

and

adjust

the

semi-fixed

the

drive

motor

base

for

frequency

counter

reading

3000

2°oHz.

MTT-HI

frequency

counter

P.B

LINE

OUT

OODO

OOOO

Playback

Level

Adjustment

Connect

VTVM

LINE

OUT.

Play

test

tape

TEAC

MTT-212C

(160

nWb/m)

and

adjust

101

(left

channel)

and

102

(right

channel)

for

LINE

OUT

level

reading

—7±1

dBm

(346

mV).

3000

K-200

Head

Azimuth

Adjustment

Remove

the

cassette

cover.

Connect

two

VTVMs

and

oscilloscope

the

left

and

right

channels

LINE

OUT.

Play

test

tape

TEAC

MTT-114

(10

kHz)

and

turn

the

R/P

head

azimuth

adjustment

screw

that

the

outputs

.of

both

left

and

right

channels

are

maximum,

equal,

and

phase.

After

adjustment,

apply

screw

lock

paint.

Playback

Frequency

Response

Check

Connect

VTVM

LINE

OUT.

Play

test

tape

TEAC

MTT-216

(3180

120

/is

LH)

MTT-316

(3180

70/ts

Cr0

)

and

confirm

that

the

10-kHz

reading

within

±3

the

315-Hz

reading.

MTT-216

(MTT-316)

LINE

OUT

VTVM

Recording

Adjustments

vel

Meter

Adjustment

Connect

audio

oscillator

LINE

and

VTVM

LINE

OUT.

Put

the

deck

into

the

record

mode

and

apply

1-kHz

signal

LINE

which

will

cause

—7

dBm

(346

mV)

the

LINE

OUT.

Adjust

105

(left

channel)

and

106

(right

channel)

that

the

meter

pointers

read

±1.5

dB.

ord

Level

Adjustment

Establish

the

same

connections

for

level

meter

adjustment,above.

Put

the

deck

into

the

record

mode

and

apply

315-Hz

(1-kHz,

333-Hz)

signal

LINE

which

will

read

-7

dBm

(346

mV)

LINE

OUT.

Use

the

TDK

C-60

Cr0

tape

and

record

this

signal.

Adjust

103

(left

channel)

and

104

(right

channel)

that

the

recorded

signal

reads

-7

dBm

(346

mV)

upon

playback.

VTVM

OSClLLArOH

©fi

ooo

UNCOUT

-TaBm

Recording

Bias

Current

*Set

the

DOLBY

switch

OFF.

Connect

audio

oscillator

LINE

and

VTVM

and

distortion

meter

LINE

OUT.

Apply

signal

LINE

which

will

read

—27

dBm

(34.6

mV,

-20

VU)

LINE

OUT.

•

Cr0

Position

Use

TDK

C-60

Cr02

tape

and

adjust

101

(trimmer

capacitor,

and

that

the

14-kHz

record/playback

level

within

±3

the

1-kHz

(315-Hz,

333-Hz)

record/playback

level.

this

time,

distortion

315-Hz

(1-kHz,

333-Hz),

must

below

2.5%.

•

Position

Use

TDK

C-60

(LH)

tape

and

check

that

the

14-kHz

record/playback

level

within

±4

the

315-Hz

(1-kHz,

333-Hz)

record/playback

level.

•

METAL

Position

Use

TDK

C-60

metal

tape

and

check

that

the

14-kHz

record/playback

level

within

±4

the

315-Hz

(1-kHz,

333-Hz)

record/playback

level.

Location

Adjustment

Points

P.B

LEVEL

ADJUSTMENT

Cr02

BIAS

ADJUSTMENT

(

)

(®)

VR104

//(«)

REC

LEVEL

ADJUSTMENT

(L)

(R)

□

METER

ADJUSTMENT

■

SPECIFICATIONS

Track

Configuration

....

track

channel

stereo

Motor

servo

motor

(capstan)

Heads

Flat

torque

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

tape)

better

than

(Dolby

on,

Cr0

tape)

better

than

Frequency

Response

Normal

tape

(—20

dB)

15,000

Cr0

tape

(—20

dB)

15,000

3dB

Metal

tape

(—20

dB)

15,000

3dB

dB)

12,000

3dB

Overall

Distortion

Metal

tape.

less

than

1.0%

(315

Hz)

Channel

Separation

better

than

Hz)

Crosstalk

better

than

(125

Hz)

Erasure

rate.

better

than

(400

Hz)

Input

Sensitivity/Impedance

Mic

mV/5K

ohms

Line

mV/80K

ohms

Output

Level

Line

350

mV/2.2K

ohms

Phones

6mW/8

ohms

Power

Supply

120V,

(U,C)

220V,

JHz

(G)

240V,

(A,B)

110/1

20/220/240

50/60

(R)

Power

Consumption

......

Dimensions

(WxHxD)

435

278

(17-1/8

4-13/32

11")

Weight

(9.9

ibs)

Specifications

subject

change

without

notice.

Dolby

Laboratories

Licensing

Corp.

U.S.A.

Model

Canadian

Model

General

Model

Australian

Model

British

Model

European

Model

■

BLOCK

DIAGRAM

K-2

IPERFORMANCE

CHART

FOR

MECHANISM

LOGIC

FWD

SW104

button

-»push

►

Cl78

charged

►

TRI

—

base

TR113

via

R202

“ON”

locked

D127

ferenti-

ation

C176|

105

pin6

“H"

pin7

“L”

REEL

MOTOR

forward

drive

HEAD

plunger

operation

Dill

con¬

ductive

BRAKE

plunger

operation

TRI20I

“ON”

CAPSTAN

MOTOR

drive

voltage

109,110

Auto

Shut-off

circuit

stand-by

“OFF”

TRI

07,

108

►

“OFF”

Muting

circuit

released

REC

button-

►

push

SWIOI

101

5,7,9

101

-2,

4,6,8,

ch;

recording

circuit

established

ch.

recording

circuit

established

TRII5

TRI07,

108

SWI0M

“OFF”

Muting

circuit

released

REC

INDICATOR

lights

101-12

voltage

TR117

Tape

Selector

circuit

operation

Record

Protection

Tab

present

missing

REC

IHN

open

closed

105

“L”

“H”

105

“H”

“

”

voltage

116

Recording

Bias

circuit

operation

Shut-off

plunger

"ON"

REC

button

lock

disabled

button

■

push

SW104-3

voltage

TR109.110

Auto

Shut*off

circuit

stand-by

REW

button

push

104-1

TRI

“ON”

base

TR113

locked

D126

REEL

MOTOR

reverse

drive

voltage

-----^

TR109.110

Auto

Shut-off

circuit

stand-by

(REW)I

mode

STOP

button

-PUSH

104-4

charge

Cl79

released

BRAKE

plunger

operation

POWER

SWI03

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