Teac V-870 Bedienungsanleitung

TEAC

SERVICE

MANUAL

Vv:

870

STEREO

CASSETTE

DECK

V-870

SPECIFICATIONS

{tte

Track

System

4-Track,

2-Channet

Stereo

Heads

Erase,

Record

and

Playback

(Combination)

Type

Tape

Cassette

tape

C-60

and

C-

{Philips

type)

Tape

Speed

4.76

cm/sec.

(1-7/8

ips)

Motors

Servo

motor

{for

capstan

drive}

motor

(for

reel

drive}

motor

(for

ancillary

control}

Wow

and

Flutter

(WRMS)

0.025

Frequency

Response

(Overail)

—20

—

21,000

Metal

Tape

“(25

-—

20,000

d8)

—

20,000

CrO.

Tape

(25

—

19,000.Hz

dB).

18,000

Normal

Tape

(25

—

17,000

dB)

iat

etch

Ratio

{Overall}

(3%

THD

Level,

Weighted)

"70

(Solby

Bin,

aver

kHz),

(Dolby

,over

kHz),

ait

Fast

Winding

Time.

Approximately

100

‘seconds

for

C-

NOTES:

Improvements

may

result

SPECIFICATIONS

changes,

Value

“dB”

the

data

refers

{0,775

V),

except

where

Specified.

CAUTION

4.Parts

marked

with

this

sign

are

safety

critical

components,

They

must

always

replaced

with

identical

components

—

refer

the

appropriate

parts

list

and

ensure

exact

replace-

ment.

Dojhy

Noise

Reduction

System

manufactured

under

license

from

Dolby

Laboratories

Licensing

Corporation.

“Dolby”

and

the

deuble-D

symbol

are

trademarks

Dolby

Laboratories

Licensing

Corporation.

Inputs

Line:

mV,

50k

ohms...

Outputs

Line:

0,3

for

load

mehr

50k

ohms

Ree

Headphones:

ohms”.

Power

Requirements

120/220/240

AC,

S0/60

(General

export

models)

120

AC,

(U.S.A./Canada)

220

AC,

(Europe)

240

AC,

(U.K./Australia)

Power

Consumption

Dimensions

(Wx

435

123.5

279.5

(17-7/8"

4-7/8"

11"

Weight

5.9

($3.01

{bs)

net

Standard

Accessories

Input-odtput

connection

cords

Specifications

were

determined

using

metal

tape

except

noted.

tmprovements

may

result

specifica-

tions

features

changing

without

notice.

Photos

and

illustrations

may

differ

slightly

from

production

models.

LIAR

OEO,

FHEK

PETSCEMHUET.

AVI

PIO

S0.775V

FHKE

LTVETF.

AFUISHPBRBACTS,

SHH

LOA

BAL

Ea.

®RILE—/

IVEY

TATAéAls,

PIVE—MR

PPAR

RBC

BHOSRBENTONE.

®PILE—-RU

Old,

KILC

RAO

SRR,

V-870

REMOVAL

EXTERNAL

COMPONENTS

DisassembjJe

number-order

HSL

HLTK

POWER

PCB

Power

transformer

7OAs

Rec

safety

’

PARTS

LOCATION

36 se

METAL

Cassette

Fig,

3-1

Top

view

JOINT

PCB

MAIN

PCB

PhS

JOINT

PCB

DISPLAY

PCB

JOINT

PCB

the

reustee

MECHANICAL

ADJUSTMENTS

AND

CHECKS

GAB

DAME

CHEER

4-1

PINCH

ROLLER

PRESSURE

Press

the

cassette

switch

(see

Fig.

3-1)

set

dhe

deck

the

playback

mode.

The

cassette

switch

should

pressed

throughout

measure-

ment,

Hang

the

spring

scale

from

the

pinch

roller

arm,

Extend

the

spring

the

direction

shown

the

figure

watil

the

rotation

the

pinch

roller

stops,

then

return

gradually

that

the

pinch

roller

cames

into

contact

with

the

capsten

shaft

again.

Read

the

value

the

moment

the

pinch

roller

starts

rotating.

Standard

values

Take-up

side

Supply

side

390

—

490

(13.8

—

17.3

oz}

170

—

230

(6.0

—

8.1

02)

Supply

side

4-1

EwrFea—

SRD

ARYh.

(FIO.

BRR)

BEAICHUTSY

4+E~KEGS,

HER,

AvVYb-

FIG

LAICHUBU

STE.

CYR

+O-D-

P-ACARREENTS.

Bee

vs-

O-DOREAILESE

CHROAMCEROK

CyF-o-

PRCT

ame

vay

helenae

KORACI.

¢yvF+oO-

SHOOMHSLEOWERE,

RBI

FL7PYTH

390

490

HTS4IH

178

230

Take-up

side

T4AIF

Fig.

4-1

Pinch

roller

pressure

measurement

F-O—-

4-2.

TAPE

PATH

ADJUSTMENT

Note:

The

following

special

tools

and

tapes

are

required

for

this

section.

Head

check

jig

(P/N

5736006600)

Head

check

jig

(P/N

5736006700)

MTT-150

test

tape

(for

Dalby

level

calibration)

MTT-356

(or

MTT-256}

test

tape

(for

frequency

response

check)

MTT-902

mirror

tape

{0-90

type)

DECK

undar

TEST

OUTPUT

Voltmeter

Fig.

4-2

Test

setup

for

azimuth

adjustment

PYUVARBBRG

4-2

F—-PHRTMWE

COMBEITSIROICAADNBR,

FAR:

TH.

FiBRA

(P/N:

5736006600)

PAB

(P/N:

5736006700)

MTT-150

FAR+7T—-DCRILE—:

MTT-356

(KIKMTT-256)

TAR:

=A)

MTT-902

3—

F—

PALE

PAIL:

FEB

—F

(C-908)

O°

(in

phase)

45° 90°

~—S-135°—-

180"

(out

phase)

e468

PAOD

Fig.

4-3.

Confirming

phase

relationship

RTH

Note

When

the

record/playback

head

has

been

replaced,

tighten

screws

(A),

(B),

(C}

shawn

Fig.

4-6

until

they

stop,

then

siacken

them

1-1/2

turns

before

starting

atign-

ment.

Note

When

the

erase

head

has

been

replaced,

install

shown

Fig.

4-6:

Attach

head

position

alignment

jigs

and

then

set

the

deck

the

play

mode,

Fit

jig

the

tape

guide

the

record/playback

head

shown

Fig.

4-5,

then

align

the

height

with

screw

(A)

shown

Fig.

4-6,

Fit

jig

the

head

shawn

Fig.

4-5

check

its

tilt

and

align

using

screws

(B)

and

(C)

shown

Fig.

4-6,

Then

align

the

height

again

with

screw

(A).

Repeat

alignments

procedure

and

two

three

times

align

height

and

tilt.

(When

adjusted

the

standard

height,

the

head

should

wnder

the

tape

guide.)

Fit

jig

the

tape

guide

the

ieft

pinch

roller

and

align

the

height

with

nut

{E).

(The

standard

height

above

the

tape

guide,)

Play

test

tape

MTT-902,

and

adjust

nut

(E)

that

the

lower

edge

the

tape

guide

the

record/playback

head

in.contact

with

the

tape

edge,

but

the

tape

not

curted.

Adjust

the

azimuth

the

playhack

head

with

screw

(C)

shown

Fig.

4-6

according

item

5-3

(an

page

15).

the

screw

rotated

half

turn

more,

turn

screws

(A)

and

(B)

the

same

amount

then

align

again

from

item

correct

the

height

the

tape

guide

the

record/playback

head.

Adjust

the

azimuth

the

recard

head

with

screw

(0)

shown

Fig.

4-6

according

item

5-5,

(Refer

page

18.)

Screw

(D)

should

not

turned

than

half

turn.

After

alignment

complete,

check

that

the

tape

does

not

curl

over

the

tape

guide

repeating

play

and

stop

operations.

head

check

jig

(5736006600)

REC

Head

P/B

Head

Ban»

BEA

Fig.

4-6

BAy

FERRE

La.

Fig.

4-6

ORD

(A),

(8),

(0)

MILKSKTHS,

TOMBASTNTNORY

1.5

DEOSORKKETHBEROSCE.

322

BEAy

ReReLecaid,

Fig.

46°

OLIKRATS.

FORMBRBIBR

A,B

ety

hULS

E-KRTS.

Fig.

4-4

DADKH+

BAY

EOT-7

HFK

#4T,

Fig.

ORD

(A)

CHARIS.

Fig.

4-5

OLDCARB

FICMTCFIV

SHER,

Fig.

4-6

ORY

(B),

(0)

THRLER,

BRAY

(A}

HET

bie

ORs

2~3

DHRORL,

BS,

FIVbeB

TS.

(BEOREMT-TF

>HI

FORHECTS).

EEYF+O-FOF—7F

PRBR

BAT,

{E)

CTHSEHBITS.

(BAIOBRT-T*

H7KOEM

etd).

FAb+F7—-TF

HIT-902

SESH,

BAY

FOT-T

H4KOPMRD-VUGVBRKSRSASIYR

(De

MRSS.

BEAySOPIVA®

$318

(11

N8-DBR)

Kiko

Fig.4-6

ORY

(C)

CHRYS.

1/2

BRK

EBILE

ESR:

BAY

FOFT-7

PRS

KkEnDtSKH,

(A),

(3)

DARELEBRS

ACROR

BEPORST.

REAYFOPYVA®

5-518

(13

A-DBR)

ichto

Fig.

4-6

ORY

(D)

CTHRTS.

(0)

ORRBHIt

1/2

MRIKALTS.

BUOMROBR,

Ter

AbyvTRBORBL,

7-7

ECF-TRH-VLBWE

ESTERS,

head

check

jig

head

check

jig

(5736006700)

head

check

jig

{5736006

700}

_(5736006600}

Fig.

4-4

Fig,

4-5

igt

dj.

REC

Head

Azimuth

Screw

tas

REC

ARE

These

should

touch

P/B8

Head

Tilt

Adj.

Screw

HBSUAR

Azimuth

Screw

panes

FBR

P/BTYVVAWERAY

4-3

REEL

TORQUE

CHECKS

AND

ADJUSTMENTS

Using

cassette

torque

meter,

check

that

reel

torque

each

tape

transport

operation

within

the

following

specified

range.

60g-cm

{0.34

0.83

02-inch}

Fast

Forward/

160

g-cm

Rewind

(1,25

2.22

02-inch}

*Back

Tension

ft.

Connect

voltmeter

between

TP.4

and

TP.GND

the

main

board.

Play

the

middle

part

test

tape

MTT-5511

and

adjust

R42

that

the

voltmeter:

shows

the

values

the

above

table.

4-4

TAPE

SPEED

ADJUSTMENT

Connect

frequency

counter

the

deck

shown

Fig,

4-7.

Playing

the

mid

portion

MTT-111

test

tape,

adjust

the

semi-fixed

resistor

capstan

motor

that

tape

speed

becomes

3,000

«5

Hz.

insulated

and

non-metallic

flat-head

screwdriver

should

used

for

this

adjustment.

Check

that

the

following

values

are

obtained

the

beginning

and

the

end

the

tape.

Deviation:

3,000

+45

Width

deviation:

Within

4-5

WOW

AND

FLUTTER

CHECKS

Note:

These

measurements

should

made

the

beginning,

middie

and

the

end

the

tape.

4-5-1

PLAYBACK

METHOD

Connect

wow

and

flutter

meter

the

deck

shown

Fig.

4-7.

. .

Load

TEAC

MTT-111

test

tape

equivalent

and, play

measure

the

wow

and

flutter

value.

Specifications

are

shown

belaw.

0.05%

WRMS

4-3

bILPRERBRURE

hMhILD

A-FTKSMEMOFROBANT

HSLLAERATS.

FABPIYTS

25~60

KRY

DFYY

40~0,

56V

RNY

YvrYar

@SQERe

HAIN

PCB

TP.4

TP.GND

(CRESS.

FAbe

NIT-5511

OPRAHESHEL,

BEHOHAR

BLEROWKESLS

SBMTS.

TREE

Big

OKDSICIMRKADY

SSP

ICMAT

MTT-1SFAb-F-7O

BEBALT.

—OME

3,000Hz

TSH2IZTHAAKAI

$~pAIAZGuV:

E-FOP

PEI

PRET

PARTS

RANKS

REY

NGMHTSCE,

FIO

BMUICT

FROMMBONSILE

FETS,

Wi:

3,000Hz

45Hz

ee:

30Hz2

Law

-7o>yvy

FER

JER

F—

TORO,

PH,

BRU

CEM

ENWMETS.

4-5-1

BAER

Fig.4-7

MEAD

Doyo

A—-SEFY

FCM

rss)

TEAC

MTT-1UF

F—TPRidH

soe

RAK,

HELID-

Poy

Tew

TS.

0.0599

WRMS

(MB

ReAB

IE)

4-5-2

RECORD/PLAYBACK

METHOD

Note:

When

measuring

with

this

method,

the

recorded

section

should

played

back

repeatedly

abtain

average

vaiue,

careful

not

read

the

meter

for

those

parts

the

tape

which

wow

and

flutter

components

recording

and

play-

hack

cancel-each

other.

Load

blank

FEAC

MTT-5521

test

tape

equivalent

and

‘record

3,000

signai.

Rewind

the

tape

the

beginning

the

recorded

section,

and

play

it.

The

wow

and

flutter

should

not

mare

than

specified.

Specification:

0.2%

RMS

oscillator

frequency

counter

wow/flutter

meter

DECK

under

test

output

Connection

for

tape

speed,

wow

and

flutter

F~-TRE,

VO-7evF

MEER

Fig,

4-7

4-6

LUBRICATION

Lubrication

only

required

when

parts

are

replaced.

For

this

pur-

pose,

use

the

oi}

and

grease

specified

betow.

Oil:

TEAC

TZ-255A

motor

(fram

TEAC

TZ-255

oil

kit},

Mobil

D.T.E.

Oil

Light,

equivalent

Grease:

ORE-LUBE

G1/3

equivalent

Apply

drop

oil

with

oil

applicator

point

about

1/3

the

way

dawn

the

shaft

(fram

the

free

end}

the

flywheel,

then

insert

the

shaft

inta

the

capstan

housing.

Apply

suitable

amount

light

grease

the

well

the

fly-

wheel

bearing.

4-7

VOLTAGE

CONVERSION

(FOR

GENERAL

EXPORT

MODELS)

ALWAYS

DISCONNECT

TRE

POWER

LINE

CORD

BEFORE

MAKING

THESE

CHANGES,

Locate

the

voltage

selector

the

rear

panel

the

deck

shown

the

illustration,

Using

regular

screwdriver,

turn

the

selector

until

the

numerais

corresponding

the

voltage

requirements

your

area

appear.

4-5-2

SRB

HR:

RMRAOBS

EMPEREDAL

YT.

SRREL,

KACENS

Fie.

RIEL

REL

EROIY

IROOM

+-p

VEVLEETHFERKEOKSITTS,

F5YI*

FAK

F—TTEAC

MTT-S821R

ist

BTCAL,

3,00H

EME

—

FORE

VERDPEERLTHETS.

SHAFT

ROM

HNEUT

He:

0.29%

RMS

(JERR

ARH

IF)

4-6

j=78

EGASMAVRIRANSHOALRTSH.

SEALED

U-—RZSERALEF,

AIL:

TEAC

TZ-255AE—%

4-1

JL(TEAC

TZ-2559-1

RAPD)

E-EWD+

TBAT

STK

KEI

#834

FY—A:AP

W—IGWV/3,

RRA

Li.

DST

VEO

EMD

91/3

RRA,

BEE

ITT.

AI,

DOA

WHEE

DAB

QUVUVINSSATS.

HEOTU-ALKDSAKT

NPUVFRIADIS,

TRUBIC

IAP

BAAR

capstan

flywheel

ass’y

capstan

shaft

weil

flywheel

stan

housin:

bearing

cepeta

;

Apply

drop

oil

here

—~BiEBF

Fig.

4-8

Fig.

4-9

Voltage

conversion

ELECTRICAL

CHECKS

AND

ADJUSTMENTS

PurAPROMR

PRECAUTIONS

5-1

Since

this

deck

has

automatic

tape

selector,

sure

use

BREST

PUIS

BARERBIC

TORT

OT,

test

tapes

that

have

tape

position

detecting

holes.

FARK

F-—PALGF—-—D

RYVY

PHLOHSH

Before

performing

adjustments

and

checks,

clean

and.

demag-

DEBRLUTC

EA,

netize

the

entire

tape

path,

then

check

tape

motion

condition.

PYIRORMRORAIC,

WHA

EK,

BAYE,

sure

the

deck

propedy:

set

for

the

voltage

your

_JHTFAPENENERAWREL,

7U-TIECURAL

ocality,

ees

Seifa

Peni

ier

general,

adjustments

and

checks

are

made

the

order

L-ch

JRTARERET

then

R-ch

FIOBBOMURU,

PBRUF

7lkL-ch,

R-choin

Double

REF.

Nos.

such

R12/R22

indicate

L-ch/R-ch.

FCI

TRS.

The

volimeter

used

the

procedures

must

have

input

MRI2Z/“R2MOA

AIC

PANCHOSHM

IAL-ch’R-ch

impedance

more.

ERULET

referenced

0.775

VAIL

ADT

VESVAIMOLLEOSOSBALTE

eh.

O0dB=0.775V

§-2

TEAC

TEST

TAPES

MTT-158:

For

Dolby

level

calibration

MTT-356:

For

playback

frequency

response

check

for

CrO2,

METAL

MTT-256:

For

playback

frequency

response

check

for

NORMAL

MTT-5571:

For

METAL

record

test

MTT-5561:

For

CrO.

record

test

MTT-5511:.

For

NORMAL

record

test

Oscillator

Oistortian

Analyzer

Attenuator

LINE

OUTPUT

5-2

TEACT

AF:

MTT-150

MTT-356

MTT-256

MTT-5571:

MTT-5561:

MTT-5511:

KES

CrOg,METAL

3-0-3342

RBA

NORMALS

—

JOB

Mik

eHtE

METALF—JORBRT

CrOgF

—-JORERT

AKA

NORMALP—

JORERT

ARM

Oscilloscapea

Voltmeter

Fig.5-1

Basic

testsetun

SABER

Fig.

5-2

Chack

and

adjustment

points

MAIN

PCB

Oscilloscope

Amp

SPKR

DECK

under

TEST

OUTPUT

Voltmeter

Fig.

5-3

Test

setup

for

azimuth

check

Gira

abe

srl

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