Tascam 122MKIII Manual de usuario

TASCAM

TEAC

Professional

Division

(122MKiil)

SERVICE

MANUAL

122MKI/112RMKI/112MKI

Stereo

Cassette

Deck

NOTES

As

regards

the

resistors

and

capacitors,

refer

to

the

circuit

RREAIVS

YUL

CHVES.

GRRE

LUSR

diagrams

and

the

PCB

assy

drawings

contained

in

this

manual.

BEBRUTKCKEAV

*

PC

boards

shown

viewed

from

parts

side.

LFUYbBREISRRHMRANTIET.

+

Parts

marked

with

*

require

longer

deliver

time.

2.

KENOMRILMMOSFODVET.

SBOMCHCIRIK

x

A\

Parts

marked

with

this

sign

are

safety

critical

components.

So

They

must

always

be

replaced

with

identical

components

—

3.

A

MSRSRRBEMATH.

BURT

SCRMIs

+

Py

refer

to

the

TEAC

Parts

List

and

ensure

exact

replacement.

FIEOMMEEBLT<

EA.

*

Parts

not

shown

in

the

parts

lists,

or

parts,

though

listed,

having

4.

UZbKANTWRVBRILRAELCH-EAZHKBMAECLT

no

parts

numbers,

are

not

general

“ready-to-supply*

parts.

RRs

Tuk

tA.

INSTRUCTIONS

FOR

SERVICE

PERSONNEL

BEFORE

RETURNING

APPLIANCE

TO

THE

CUSTOMER,

MAKE

LEAKAGE-

CURRENT

OR

RESISTANCE

MEASUREMENTS

TO

DETERMINE

THAT

EXPOSED

PARTS

ARE

ACCEPTABLY

INSULATED

FROM

THE

SUPPLY

CIRCUIT.

Effective

:

AUGUST,

1993

4A0735

5704066611

T22MKI/TIZRMKU/112MKI

|

1.

SPECIFICATIONS

Tape

:

Compact

cassette

C-30

to

C-90

(Normal/Cr02/

Metal)

Track

Format

:

4-

track,

2-

channel

Head

Configuration

122MKM

=:

~«4-track,

2-channel

Record

(x1)

/repro

(xl)

combination

head

(amorphous)

Half

track

Erase

head

(x1)

(ferrite)

:

4-track,

2-channel

Record

(x1)

/repro

(xl)

combination

rotary

head

(permalloy)

Half

track

Erase

head

(x1)

(ferrite)

:

4-track,

2-

channel

Record/repro

head

(x1)

(permalloy)

Half

track

Erase

head

(x1)

(ferrite)

112RMK

0

112MK

I

Motor

122MK

I

=:

FG

servo

direct-drive

capstan

motor

x1

DC

servo

reel

motor

xl

DC

ancillary

motor

xl

112RMK

0/112MK

I:

DC

servo

capstan

motor

x1

DC

reel

motor

xl

DC

ancillary

motor

xi

Tape

Speed

:

4.8

cm/sec.(1-7/8")

Pitch

Control

:

+/-12

%

(approx.)

Line

Input

-Rear

RCA

jack/front

1/4"

jack

Nominal

input

Level:

-10

dBV

(0.3

V)

Minimum

Input

Level:

-18

dBV

(126

mV)

Input

Impedance:

20k

ohms,

unbalanced

-XLR-type

jack

(standard

on

122MK

I

;

optional

on

112RMK

0.

/112MK

I

~

LA-112

required)

Nominal

Input

Level:

+4

dBm

(1.23

V)

Input

Impedance:

10k

ohms,

balanced

Line

Output

-RCA

jack

(rear)

Nominal

Output

Level:

-10

dBV

(0.3

V)

Maximum

Output

Level:

-2

dBV

(0.8

V)

Output

Impedance:

100

ohms

Load

Impedance:

25k

ohms

or

more

-XLR~type

jack

(standard

on

122MKII

;

optional

on

112RMK

11/112MK

I

—-

LA-112

required)

Nominal

Output

Level:

+4

dBm

(1.23

V)

Minimum

Load

Impedance:

600

ohms

Headphone

Output:

100

mW

(8-ohm

load)

Bias/Erase

Frequency

:

122MK

I1/112RMK

I

:

150

kHz

112MK

0:

100

kHz

{Lt

Equalization

:

3180

7s+70

us

(CrO2/Metal)

3180

7

s+120

us

(Normal)

Reference

Recording

Level

:

250

nWb/m=0

VU

(315

Hz)

(EIAJ)

;x

with

Dolby:

200

nWb/m=-1.

VU

Remote

Connector:

25-pin

D-sub

Power

Requirements

:

USA/Canada:

120

V

AC,

60

Hz

U.K./

Australia:

240

V

AC,

50

Hz

Europe:

230

V

AC,

50

Hz

Japan:

100

V

AC,

50-60

Hz

Consumption

:

122MK

11/112RMK

I:

23

W

112MK

I:

20

W

Dimensions

(WxHxL)

:

482

mm

x

132

mm

(rubber

feet

not

included)

x

356.3

mm

(19"x

5-3/16"

x

14”)

Weight

:

122MK

I1/112MK

1:

8.4

kg

(18-8/16

Ibs.)

112RMK

I:

8.7

kg

(19-3/16

Ibs.)

Typical

Performance

Speed

Accuracy

:

122MK

I:

+/-0.5

%

112RMK

01/112MK

I

:

+/-1.0

%

Wow

&

Flutter

1):

less

than

0.04

%

WRMS

Fast

Winding

Time:

70

sec.(approx.)

with

C-60

Frequency

Response,

Overall

2)

(EIAJ,

without

NR)

122MK

Mf:

25

Hz

to

20

kHz,+/-3

dB

(Metal)

25

Hz

to

19

kHz,

+/-3

dB

(CrO2)

25

Hz

to

17

kHz,

+/-3

dB

(Normal)

:

25

Hz

to

19

kHz,

+/-3

dB

(Metal)

25

Hz8to

18

kHz,

+/-3

dB

(Cr02)

25

Hz

to

17

kHz,

+/-3

db

(Normal)

:

25

Hz

to

19

kHz,

+/-3

dB

(Metal)

25

Hz

to

18

kHz,

+/-3

dB

(CrO2)

25

Hz

to

16

kHz,

+/-3

dB

(Normal)

Distortion

2)

:

less

than

1.0

%,

at

1

kHz,

160

nWb/m

(Metal)

S/N

Ratio

2)

(metal

tape)

122MK

I[/112RMK

I:

60

dB

(without

NR,

ref.

3

%

THD,

WTD)

:

59

dB

(without

NR,

ref.

3

%

THD,

WTD)

68

dB

(with

Dolby-B

NR,

over

5

kHz)

78

dB

(with

Dolby-C

NR,

over

1

kHz)

Channel

Separation

2):

45

dB

or

better

(1

kHz)

Erase

Ratlo

2):

65

dB

or

better

(1

kHz)

112RMK

I

112MK

I

112MK

I

In

these

specifications,

0

dBV

is

referenced

to

1

Volt,

and

O

dBm

is

referenced

to

0.775

Volt.

Actual

voltage

levels

are

shown

in

parenthesis.

1)

Measurements

made

with

TEAC

test

tape

MTT-111

2)

Measurements

made

with

TEAC

blank

test

tape

MTT-

5571

(Metal),

MTT-5562

(CrO2)

and

MTT-5512

(Normal).

‘

Dolby

noise

reduction

and

HX

PRO

headroom

extension

manufactured

under

license

from

Dolby

Laboratories

Licensing

Corporation.

HX

PRO

originated

by

Band

and

Olufsen.

"DOLBY",

the

double-D

symbol

"00"

and

"HX

PRO"

are

trademarks

of

Dolby

Laboratories

Licensing

Corporation.

:

MiChanges

in

specifications

and

features

may

be

made

without

notice

or

obligation.

|

122MKIl/112RMKI/112MKII

@

<

OBIS,

OdBV=1V,

0dBm

=

0.775V

CRRLTOEFS

SROBLL

()

CRLTOES,

Bl)

cOBoOeHI.

FAh-F-S

TEAC

MTT-1ILIZE

HET.

2)

LOMO,

FSU

7

-F-7

TEAC

MTT-5571

(METAL),

MTT-5562

(CrO2),

MTT-5512

(NORMAL)

KkOET.

MRE

LUANG,

PEEK

EBT

SBSH

DET,

*

FVE-*/A

RUFF

yY

ayvRUEXFoeAy

FV-bt

DAF

VY

ard

KFVE-SRShY-KS4evy

ya

-RL-YarPoORPMECERIsMAnTWVET,

HX

TONY

ITY

FANI“GYOSREYT,

*

(KVE-],

(00)

RU

CAX

Fo]

EV

E-SH#ShY

-RIFRYY

YF

A-RV-Y

3

LORSRETCT,

llustration

shows

122MK

Ill.

The

measurements

of

the

three

models

are

the

same.

FFAS

IZZ2MKMOSOTH.

112RMK

il,

112MK

1

SHEETS.

122MKI/112RMKIL/112MKI

|

2.

MECHANICAL

CHECKS

AND

ADJUSTMENTS

PETS

EE

OTE

tS

2-1.

Pinch

Roller

Pressure

(122MK

11,112RMK

Il,112MK

Il,)

.

Attach

a

spring

scale

to

the

pinch

arm.

.

Push

up

the

cassette

switch

(transport

protection

lever),

then

while

holding

the

cassette

switch

up,

press

the

PLAY

button

to

engage

the

pinch

roller

and

capstan

shaft.

3.

Pull

the

spring

scale

in

direction

indicated

in

Fig.

2-1

until

the

pinch

roller

fully

loses

contact

with

the

capstan

shaft;

then

slowly

ease

the

scale

so

the

pinch

roller

moves

back

toward

the

capstan

shaft.

4.

Note

the

reading

on

the

spring

scale

the

moment

the

pinch

roller

again

starts

rotating.

The

scale

should

read

380

to

480

g.

*

Check

both

in

FWD/PLAY

(right

pinch

roller)

and

in

REV/PLAY

(left

pinch

roller)

for

112RMK

I.

we

2-1.

Evy

¥0-sEBH

(122MK

IIl,112RMK

11

,112MK

II)

LOY

F

+

T-BAR.

Zmey

bh

tye

RA

VFO

F-LELAIHHL,

PLAY

#9

VERALT.

FU4+E-KIGTS

MER.

AL

VFO

T-

ALA

IHLEHITS

TL.

BEYF

sao

-SRe

ye

ARGV

Ye

DT

hPOoORecensk

SICPBERPOAM

(H2-1)

5s,

Cv

FF

-0-F

RHUF

ye

TAI

Ys

ve

7

RCERTSEIICRLICRT.

4.CYF

>

0-SREYBHSZLEDBERL,

*

112RMK

Hit,

FWD/PLAY

(4b

yF+a-5),

REV

PLAY

(EUY#F+u-F)

HBTS,

HHS

:

380~480

g

Fig.

2-1

2-2-A.

Tape

Positioning

(122MK

Ill)

Adjustment

Tools

:

*

Head

adjustment

jig

”"A”

:

Part

No.

5736006600

*

Head

adjustment

jig

"B”

:

Part

No.

5736006700

«Erase

head

spacer

;

0.05mm

:

Part

No.

5801357800

O.lmm_

=:

Part

No.

5800556200

0.2mm

_

:

Part

No.

5801197800

jig

B

R/P

head

Fig.

2-2

2-2-A.

F—

FHF

(122MK

Ill)

mBiGR

“Ny

FRIES

A

:

dh

5736006600

“Ny

FSR

B

:

ae

5736006700

“HEN

y

Fe

AN-—+0.05mm

:

dB

5801357800

0.lmm_:

sa@

5800556200

0.2mm

:

gaa

5801197800

jig

B

R/P

head

Fig.

2-3

1.

Adjusting

the

erase

head

height

1).

Set

jig

A

as

shown

in

Fig.

2-2,

then

set

the

deck

to

PLAY

mode.

2).

Confirm

that

jig

B

smoothly

fits

into

the

tape

guide

groove

on

the

erase

head.

If

it

doesn’t,

add

or

remove

the

spacer(s)

between

the

erase

head

and

head

base.

2.

Adjusting

the

R/P

head

height

8).

As

with

the

erase

head,

confirm

using

jig

B;

for

adjustment,

use

height

adjustment

screw

A

(Fig.

2-4).

3.

Adjusting

the

R/P

head

tilt

4),

As

shown

in

Fig.

2-3,

place

jig

B

against

the

head

in

order

to

confirm

the

tilt.

Perform

tilt

adjustment

with

screw

B

(Fig.

2-4)

so

that

the

head

is

at

right

angles

with

respect

to

jig

B.

5).

If

tilt

adjustment

screw

B

is

adjusted,

revert

to

3),

then

confirm

again.

4,

Adjusting

R/P

head

azimuth

6).

As

shown

in

Fig.

2-5,

hook

up

the

measuring

instruments.

7).

Play

back

the

10

kHz

signal

on

test

tape

MTT-256,

then

adjust

playback

azimuth

adjustment

screw

C

(Fig.

2-4)

so

that

the

phase

difference

between

L

and

R

channels

is

0°

.

8).

If

azimuth

adjustment

screw

C

is

turned

more

45°

,

revert

to

3),

then

reconfirm.

5.

Confirming

the

tape

travel

9).

When

mirror

tape

MTT-902

is

run

in

PLAY

mode,

see

that

the

tape

is

free

from

curl

at

each

guide

portion.

10).

If

the

tape

is

curled,

fine-adjust

the

R/P

head

height

using

screw

A

[or

adjust

the

erase

head

height

using

spacer(s)]

then

revert

to

6)

and

reconfirm.

REC

head

REPRO

head

REC

azimuth

adj.

screw

A

screw

B

Fig.

2-4

|

122MKI/112RMKI/112Mk1

LARA

y

FORSHEE

1).

M2-290k5KHBAZtY

LY

PLAYE-

FictS,

2).

BEBABEA

vy

FOF

-T+H4

FRIKAZL-AKAST

tEHRTS.

ZAC,

FEN

FEA

Yy

FeXK—

ZI

HSR

AN-PEBMERIRETSCERLOABTS.

2.

R/PN\y

FOR

SRS

3).

BEA»

FERRIS

RB

CHL,

BRUBSBBRTA

(BI2-4)

i

kYAS5.

3.

R/PX»

FOF

bE

4).

M2-3D04

5RGBBENY

FICMSCTCF

VE

SHBL

A

y

FRBRBICWOCTHBIRZEDIF

HV

hBRRIB

(RI2-4)

CHT.

5).

FUbRBAY

BEBE

LEBER.

3)

AiR

tHe

_

$SHRRRTS.

4.

R/PA»y

KOT

YT

ARS

6).

M2-5

O45

CHEB

3.

7).

FAh*F-PMTT-2560

10kH2

4B

LT,

Lohé

Reh

ORBEA

0°

MAL

ICRET

YL

TAREAIC

(M2

-4)

CHET.

8).

FY

VARBALY

Ce

45°

DEBRA

KBSIA.

3)

Hic

RO

tHURERERRT

4.

5.

7

-FET

ORR

9).

PLAYS-

FCI

5—+-F-PMTIT-92e#F

aE

%.

BAT

FRCF-PSOA-NARMOCLEHBY

SZ,

10).

A-V

L

TW

SBS,

R/PN»

FORSEAY

ACHE

%

(EkMAKNy

FORSEAN-VCHE)

UR

6)

BicROtNHOBEREHERT

SZ.

Oscilloscope

DECK

under

test

OUTPUT

O°finphase)

45°

=

90°

—-

135°.

180

“(out

of

phase)

(LB)

(sot)

Fig.

2-5

|

12Z2MK/TIZRMKU/TI2ZMKI

|

2-2-B.

Tape

Positioning

(112RMK

Il)

Adjustment

Tools

:

«Head

adjustment

jig

"A”

:

Part

No.

5736006600

«Head

adjustment

jig

"B”

:

Part

No.

5736006700

*R/P

head

spacer

;0.05mm

:

Part

No.

5801357700

0.lmm_:

Part

No.

5800595000

0.2mm

=:

Part

No.

5800595100

Fig.

2-6

1.

Adjusting

the

erase

head

height

1).

Set

jig

A

as

shown

in

Fig.

2-6,

then

set

the

deck

to

FWD/PLAY

mode.

2).

Confirm

that

jig

B

smoothly

fits

into

the

tape

guide

groove

on

the

FWD

erase

head.

If

it

doesn’t,

adjust

Allen

nut

A

shown

in

Fig.

2-6.

3).

Set

the

deck

to

REV/PLAY

mode,

and

in

a

similar

way,

adjust

the

REV

erase

head

using

Allen

nut

B.

4).

After

adjustment

is

complete,

repeat

FWD/PLAY,

and

REV/PLAY

for

reconfirmation.

2.

Adjusting

the

R/P

head

height

5).

As

in

the

confirmation

of

the

erase

head

height,

confirm

the

R/P

head

height

in

FWD/PLAY

and

REV/PLAY

modes

using

jig

B.

*If

the

head

is

both

high

(or

low)

in

FWD

and

REV

modes,

replace

the

spacer

under

screws

C

and

D

(Fig.

2-6)

with

a

thin

(or

thick)

one.

(Add

or

remove

the

same

number

of

spacers

with

the

same

thickness

for

both

screws

C

and

D.)

«If

jig

B

smoothly

fits

into

the

guide

groove

in

both

FWD

and

REV

modes,

or

the

height

is

opposite

(example:

high

in

FWD

mode

and low

in

REW

mode),

it

should

be

deemed

acceptable.

2-2-B.

F-FHTT

(112RMK

II)

mtiaR

*\y

FBR

A

:

Ga

5736006600

“Ny

FHSS

B

:

da

5736006700

°R/PAy

Fs

AN-—F

0.05mm

:

doe

5801357700

0.lmm_:

gaa

5800595000

0.2mm

_:

gaa

5800595100

jig

A

REV

erase

head

screw

F

1

Hey

FORSHEE

1).

2-69

£54

RAStY

BLL

FWD/PLAY€-

Fiz

To

2).

BEBAFWDABEA

»y

FOF

-—

7-H

PRI

AA-K

CASZCEXHBRTS.

ZH

CHOBE,

M2-6OnBty

hAFBET3Z.

3).

REV/PLAY

€~

FICUT,

BRI

REV

RIBE

»

FOR

SeKht»

bBCABTAZ.

4).

S49.

FWD/PLAY,

REV/PLAY

£0358

L

CHEER

tZo

2.

R/P\y

FORSRS

5).

BHkN»y

FORSHBe

Hic.

FWD/PLAY,

REV/

PLAYS—

KI<BU4R/PAy

KORSetKREBCHEBT

bo

+

FWD,

REV

CA

»

FORSPHECBY

BS.

RIC,

D

(2-6)

DFOAN-4-FRBOMWO

Bw)

HOKRAS.

(C,

DEMUCESOAZN-+F

—-

SAMARAS

BISz2&)

,

*

FWD,

REV,

EBSA

FRI

AL-XKASEBE

ALFWD,

REV

CeqSoet

(i):

FWD,

REWER

Eu)

OBS

OK

LETS,

3.

Adjusting

the

R/P

head

azimuth

6).

Hook

up

the

measuring

instruments

as

shown

in

Fig.

2-5.

7).

Play

back

the

10

kHz

signal

on

test

tape

MTT-256

in

FWD/PLAY

mode,

then

adjust

FWD

azimuth

adjustment

screw

E

(Fig.

2-6)

so

that

the

phase

difference

between

the

L

and

R

channels

is

0°

.

8).

Likewise,

adjust

REV

azimuth

adjustment

screw

F

so

that

the

phase

difference

in

REV/PLAY

mode

is

O°.

9).

If

azimuth

adjustment

screw

E

or

F

is

turned

more

than

45°

,

revert

to

5),

then

reconfirm.

10).

When

mirror

tape

MTT-902

is

mm

in

FWD/PLAY

and

REV/PLAY

modes,

see

that

the

tape

is

free

from

curl

at

each

guide

portion.

At

the

same

time,

see

that

the

tape

comes

into

contact

with

the

lower

guide

of

the

R/P

head

during

FWD

mode

and

that

the

tape

comes

into

contact

with

the

upper

guide

of

the

R/P

head

during

REV

mode.

11).

If

the

tape

is

not

traveling

as

described

above,

fine

-adjust

Allen

nuts

A

and

B

on

the

erase

head,

then

revert

to

6)

and

reconfirm.

2-2-C.

Tape

Positioning

(112MK

Il)

Adjustment

Tools

:

*

Head

adjustment

jig

"A”

:

Part

No.

5736006600

¢

Head

adjustment

jig

"B”

:

Part

No.

5736006700

°

Erase

head

spacer

;

0.05mm

:

Part

No.

5801357800

0.lmm

:Part

No.

5800556200

0.2mm

_

:

Part

No.

5801197800

*R/P

head

spacer;

0.05mm

:

Part

No.

5801357700

O.lmm

=:

Part

No.

5800595000

0.2mm

=:

Part

No.

5800595100

1.

Adjusting

the

erase

head

height

1).

Set

jig

A

as

shown

in

Fig.

2-7,

then

set

the

deck

to

PLAY

mode.

2).

Confirm

that

jig

B

smoothly

fits

into

the

tape

guide

groove

on

the

erase

head.

If

it

doesn’t,

add

or

remove

the

spacer

(s)

between

the.

erase

head

and

head

base.

2.

Adjusting

the

R/P

head

height

3).

As

with

the

erase

head,

confirm

using

jig

B,

and

make

adjustment

using

spacer(s).

3.

Adjusting

the

R/P

head

azimuth

4).

As

shown

in

Fig.

2-5,

hook

up

the

measuring

instruments.

5).

Play

back

the

10

kHz

signal

on

test

tape

MTT-256,

then

adjust

the

azimuth

adjustment

screw

(Fig.

2-7)

so

that

the

phase

difference

between

the

L

and

R

channels

is

0°

.

6).

If

the

azimuth

adjustment

screw

is

turned

more

than

45°

,

revert

to

3),

then

reconfirm.

|

122MKI/112RMKI/112MKI

3.

R/PN\y

FOV

Y

7

ARS

6).

M2-5O

45

MERLE

SZ.

7).

FWD/PLAY

€—-

FGF

AheF—-—F

MTT-256@

10kHz

=REULT,

Leh

¢

Rch

OfBEA

0°

KH

ZKIIZFWD

FAY

YT

ARBARLE

(2-6)

STS.

8).

eZ,

REV/PLAY

©

—

FECHA

0°

KAZ

KSI

REVA7

YVAMSBAY

FERS

4S,

9).

FYTARBRAVESKILZFH45°

CEB

AtrewBeald.

5)

HACK

tnNOUBAREHeRS

3.

4.7

-THPFORR

10).

FWD/PLAY,

REV/PLAY€-

F@i53-—°F-7

MTT

~W2SEASHKLE,

BAL

FRCT-TOA-—

WAH

WItSHRTS,

Ek.

FWDRK,

R/PA»

FO

FOR

4

Fic,

REVER

R/PN\»y

FOLOW4

Fic

F—-TOY4re

SLELHRTS.

11).

EIDE

GIF

—-

TREAT

LTO

UOBSI,

BEN

Y

F

OAT»

bA,

BCRAB

LEAK,

6)

HicRo

tne

EBERT

SZ.

2-2-C.

F-FH#T

(112MK

1)

mesieR

*”\y

FSSA

:

ax

5736006600

*\y

FRSEB

:

GB

5736006700

“BEN

y

Fe

AN-+F

0.05mm

:

de

5801357800

O.lmm

:

gaat

5800556200

0.2mm

_

:

gud

5801197800

°R/PN»y

Fe

AN—¥F

0.05mm_

:

ge

5801357700

O.lmm

:

gu

5800595000

0.2mm

:

and

5800595100

lL

HeAy

FORSRS

-

1).

M2-7TOLFCHBASLY

LY

PLAYE—

Feo

4,

2).

BEBAWEA

vy

FOF

-T°HT

FRICZL—-KEASZC

ces

4.

EATIWOBS,

FEN

FeNy

Fe

ACIS

AN-FREBMERLRATS

CER

LORBKTS.

2.

R/P\

y

FORASBS

3).

Bk

y

FERRIC

SBCHBL.

BRDMEN:

ECR

RI

AN-+CHT35.

R/P

head

azimuth

adj.

jig

B

screw

erase

Feead

Fig.

2-7

122MKI/11Z2RMKU/112MKIl

|

4.

Confirming

the

tape

travel

7).

When

mirror

tape

MTT-902

is

run

in

PLAY

mode,

see

that

the

tape

is

free

from

curl

at

each

guide

portion.

8).

If

the

tape

is

curled,

adjust

the

erase

head

height

using

spacer(s),

then

revert

to

4)

and

reconfirm.

2-3.

Reel

torque

(122MK

Ill,

112RMK

Il,

112MK

II)

1.

Take-up

torque/back

tension

1).

Set

up

the

cassette

torque

meter

(MTT-8111),

then

set

the

deck

to

PLAY

mode

(FWD/PLAY

mode

in

the

case

of

the

112RMK

I)

and

read

the

value

on

the

torque

meter.(If

the

reading

has

a

deflection

{the

pointer

swings],

use

the

center

value.)

The

standard

range

is

as

follows:

2).

Likewise,

put

the

cassette

torque

meter

(MTT-8121)

to

the

112RMK

I,

then

set

the

deck

to

REV/PLAY

mode

and

read

the

value

on

the

torque

meter.

Take-up

torque:

25

to

65

g*cm

Back

tension:

122MK

I,

112RMK

0;

6

to

10

gecm

112MK

If;

2

to

6

g*cm

2.

F.FWD/REW

torque

Set

up

the

cassette

torque

meter

(MTT-8242),

then

measure

the

starting

torques

in

F.FWD

and

REW

operations,

respectively.

F.FWD/REW

torque:

80

g*cm

or

more

2-4.

Tape

speed

(122MK

Ill,

112RMK

Il,

112MK

It)

a

.

As

shown

in

Fig.

2-8,

connect

the

frequency

counter.

.

Load

the

test

tape

MTT-111N.

3.

Let

the

capstan

motor

rotate

in

PLAY

mode,

then

leave

it

as

it is

for

at

least

one

minute

to

warm

it

up.

4.

Set

the

PITCH

CONT

switch

to

OFF.

5.

Play

back

the

middle

section

of

the

test

tape,

then

adjust

trimmer

resistor

Rl

(Fig.

2-9)

on

the

P.CONT

PCB

so

that

the

frequency

counter

reads

3000+5

Hz.

6.

Set

the

PITCH

CONT

switch

to

ON,

then

set

the

PITCH

CONT

knob

to

the

center.

7.

Play

back

the

middle

section

of

the

test

tape,

then

adjust

trimmer

resistor

R2

(Fig.

2-9)

on

the

P.CONT

PCB

so

that

the

frequency

counter

reads

3000+5

Hz.

8.

Upon

completion

of

adjustment,

confirm

that

the

following

value

is

obtained

at

the

beginning

and

end

of

the

tape.

iS)

Speed

variations:

3000+

45

Hz

Fluctuation

range:

within

30

Hz

3.

R/PNy

FOV

YTV

ARSE

4).

M2-5DO

£5

CMEREERT

S.

5).

FAheF-—T

MTT-256

0

10kHz4#

B+

UT,

Leche

Rch

OMIM

0°

LEAZKIKIYPTARBRY

(M2-7)

S

wT

BS.

6).

TYVARBALS

45°

OEMS

eels,

3)

Bice

DtNUEEREERT

3.

4.7

-

THETFORD

7).

PLAYE—

FCI

F—--F-F

MTT-M2e#TStKE

%.

BAT

FRCF-FOA-NARMOCLESRATS.

8).

A-VLTWSHSIZ,

HEN

y

FOMSEAXN-Y

CHE

Lik,

4)

RcR0tnNUKREHEHRT

AS,

2-3.

U-Ibs

hIVD

(122MK

Iil,1172RMK

Il,172MK

II)

LFIAFT

YT

Oh

RDF

YY

ary

1).

Aey

be

h7-2x-F

(MTT-8111)

SBBL,

PLAY

€-—

F

(112RMK

ld,

FWD/PLAY€—-

F)

2

LT

hab

Je

A-POBWERE.

HNOHSHBSUHOML

TS)

RARE

ls

FEC OIE

Y

2).

1IZRMK

Did,

BRIA

be

hI)

X-F7

(MTT-

8121)

HBL.

REV/PLAY€—

FUTHWFZ

+

X-

9

OIE

0

FAITFTIS*

bNMZ

:25~65

ge-cm

NyIFvY

say

:122MKI,

112RMKI

;6~10

g-cm

112MK

I;

2~

6

g*cm

2.

F.FWD/REW

hibZ

Atty

he

bFZ-X-H

(MTT-8242)

SHIAL.

FFWDH

TEE

LU

REW

SEO

b

V7

EENSCHHET

So

F.FWD/REW

ha7

:80

g>cmuk

2-4.

7

-TRE

(122MK

IIl,112RMK

11,112MK

I)

1,

B2-8D4

512,

ARRAY

Y

SERS

S.

2.7

Ab

+

F-7T

MIT-lLIINERSS

SQ

3.

PLAYE-—FC++7APY-S-F

EBS.

VA-

lv

TI

VTFSERBIZ,

DIK

EHIFMTOFEKLTS<

©

4.

PITCH

CONT

A4

»

FE

OFFS.

5.

FA

bh

SF

-TOPMREBE

L,

ARRAY

YY

fA

3000

£5

Hzit%Sk5tc

P.CONT

PCBOWBICIE

R1

(2-9)

ZBETS.

6.

PITCH

CONT

24

y

F#ONIZL,

PITCH

CONT

32

HE

Rize

7

bo

S.

,

7.

FA

SF

—TOPMMEGA

L.

ABBA

Dv

¥

D182

3000

+5

HzicwSk5lz

P.CONT

PCBOMEIEIH

R2

(W2-9)

2B

S.

\

9.

Confirm

that

the

frequency

is

2700

Hz

or

less

when

the

PITCH

CONT

knob

is

set

to

minimum

with

the

PITCH

CONT

switch

ON

and

3300

Hz

or

more

when

the

PITCH

CONT

knob

is

set

to

maximum.

Frequency

Counter

Wow

&

Flutter

Meter

DECK

under

test

OUTPUT

2

Fig.

2-8

2-5.

Wow

and

flutter

(122MK

Ill,

112RMK

HI,

112MK

#)

Note

:

Measurements

should

be

made

in

PLAY

mode

at

the

beginning,

middle

and end

of

the

tape,

respectively.

(However,

avoid

the

first

graduation

on

the

cassette

shell

for

the

beginning

and

end

of

the

tape.)

J.

As

shown

in

Fig.

2-8,

connect

the

wow

&

flutter

meter

to

the

deck.

2.

Play

back

the

test

tape

MTT-111N.

3.

Measure

the

wow-

flutter

value.

The

standard

range

is

as

follows:

within

0.06%

(WRMS)

2-6.

Adjusting

the

quick

reverse

voltage

(112RMK

Il)

1.

Connect

the

DC

voltmeter

between

TP2

(Fig.

2-10)

on

the

CONT

S

PCB

and

GND.

2.

When

blank

tape

MTT-5512

is

played

back

in

the

REV

/PLAY

mode,

adjust

R26

(Fig.

2-10)

on

the

CONT

S

PCB

so

that

the

voltage

at

TP2

reads

2.5

V.

CONT

S

PCB

t

ES

Fig.

2-10

TEAC-00347

/

DRUCK

1

|

122MkK0/112RMKI/112MKI

8.

ABR.

F-TSORRDLSRD

OT,

FacOseonser

&

EHTS

So

TRE

Wa

:

3000445

Hz

ee

:30

HzLA

9,

PITCH

CONT

A4

y

FONG.

PITCH

CONTDESER/

LES

2Z700HZWK,

MARLEE

3300HzUETHS

tte

P.

CONT

PCB

Fig.

2-9

2-5.99

*VIvIF

(122MK

Iil,172RMK

II

,112MK

II)

ER

:

MEUBERICKLYN,

F-TFORBO,

PHB.

SRD

OD

CENENTH

TCR

SU.

GEL,

WEY

bes

-

TOAD

teed)

O1

BBY

itR<)

1.

B2-8DE5K,

IDTV

GV

It

2A

-PEF

v

FEET

SZ.

2FAh+*F-PMTT-LLINABETS,

399°

75

yFEMET

S.

BHBIKOW).

0.06

%LLA

(WRMS)

2-6.974

997°

UN-ABERE

(112RMK

II)

1.

CONT

S

PCBOTP2

(Mi2-10)

&

GND

DCBHHEE

BEF

So

2.

REV/PLAY€~-

FG,

F747

*F-TF

MTT-905

SB

LEE,

TP2OREM

25ViITMSKIGI

CONT

S

PCBO

R26

(Bj2-10)

HET

S.

3.

AMPLIFIER

SECTION

CHECKS

AND

ADJUSTMENTS

FVYPRORRLBES

TAPE

:

MTT-256

(dB)

+3

)

0

-3

ee

er

ee

63

315

10k

(Hz)

Fig.

3-1

Playback

frequency

BE

AiR

(4B)

+1 +1

a

aaa

-3

(a

ee

20

400

20k

(Hz)

Fig.

3-2

Monitor

frequency

response

E=Y

—

ARSE

——

DOLBY

NA:

IN

»«-

DOLBY

NR:

OUT

63

400

12.5k

14k

vee

(Hz)

T12MK

11

|

122K

ill

112RMK

It

Fig.

3-3

Overall

frequency

response

SARS

10

Tascam 122MKIII Manual de usuario

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