Sony M-727V User manual

SERVICE

MANUAL

were

|

.

&

bd

id

i

Ge

5

=e

COUNTER

TAPE

j

Model

Name

Using

Similar

Mechanism

Tape

Transport

Mechanism

Type

M-I21V

US

Model

Canadian

Model

AEP

Model

E

Model

Tourist

Model

NEW

MZ-627V-14

SPECIFICATIONS

Tape

CMIEROCASSETTE)™

(normal

position

type)

Recording

system

2-track

1-channel

monaural

Speaker

Approx.

3.6

cm

(1s

in.)

dia.

Tape

speed

2.4

cm/s

(‘%o

ips),

1.2

cm/s

(‘2

ips)

Frequency

range

250

—

4,000

Hz

Input

Microphone

input

jack

(minijack/PLUG

IN

POWER)

sensitivity

0.24

mV

for

3

kilohms

or

lower

impedance

microphone

Output

Earphone

jack

(minijack)

for

8

-

300

ohms

earphone

Power

output

160

mW

(at

10%

harmonic

distortion)

Battery

life

(recording)

SONY

SUM-3

(NS)

5.5H

SONY

ALKALINE

AM3

(N)

14H

Power

requirements

*

Two

R6

(size

AA)

batteries:

3

V

DC

*

Sony

AC-E30M

AC

power

adaptor

(not

supplied):

220

V

AC,

50

Hz

(European

model)

120/220

V

AC,

50/60

Hz

(model

for

other

countries)

*

Sony

DCC-E130L

car

battery

cord

(not

supplied):

12

V

car

battery

Dimensions

(w/h/d)

Approx.

66.7

x

120.8

x

25

mm

incl.

projecting

parts

and

controls

Mass

Approx.

180

g

incl.

batteries

Supplied

accessories

Microcassette

tape

MC-30

(1)

(AEP,

Tourist)

Carrying

case

(1)

(AEP,

Tourist)

R6

(size

AA)

batteries

(2)

(AEP

Tourist)

ERPHONE

(1)

(Tourist)

Design

and

specifications

are

subject

to

change

without

notice.

MICROCASSETTE®CORDER

SONY.

SERVICING

NOTE

Flexible

Circuit

Board

Repatring

©

Keep

the

temperature

of

the

soldering

iron

around

270

°C

during

repairing.

e

Do

not

touch

the

soldering

iron

on

the

same

conductor

of

the

circuit

board

(within

3

times).

@

Be

careful

not

to

apply

force

on

the

conductor

when

soldering

or

unsoldering.

Notes

on

chip

component

replacement

e@

Never

reuse

a

disconnected

chip

component.

@

Notice

that

the

minus

side

of

a

tantalum

capacitor

may

be

damaged

by

heat.

SECTION

1

This

section

is

extracted

from

e

Parts

Identification

EAR

FAST

PB

TAPE

SPEED»

TAPE

COUNTER

instruction

manual.

GENERAL

MIC

(PLUG

IN

POWER)

MICROPHONE

REC/BATT

CUE

MARKER

@

tte

PAUSE

44

CUE/REVIEW

>>

mA

VOR

SECTION

2

DISASSEMBLY

Note:

Follow

the

disassembly

procedure

in

the

numerical

order

given.

CASSETTE

AND

BATTERY

LIDS

®

Stop

the

cassette

lid

(C)

halfway.

lid

(C)

precision

Screwdriver

or

cassette

equivalent

lid

(C)

precision

screwdriver

or

equivalent

CABINET

two

claws

a=

ae

~~

battery

terminal

(a)

Ohl)

Ss

-

battery

coil

spring

(c)

y

battery

coil

G

spring

(b)

@

BTP1.7

x

12

5]

oral

knob

Pree

2)

by

abies

inside

t

side.

cabine

Be.

rom

inside

to

out

side

fee

ae

exe

LYS”

5

—_—

SS

mete

es

SAXQ

Sec

Ax

b&b

\\

&

Pa

Au

eee

.

:

=k

SST

@

knob

(FR)

MECHANISM

DECK

cabinet

(front

c)

speaker

(3.6cm)

©

&

knob

spacer

bracket

(microphone)

M2Z-627V-14

button

(REC)

oN.

(s

MIC901

cushion

(microphone)

@ @

BTP1.7x3

main

board

@

screw

KNOB

torsion

spring

(toggle)

arm

(EJECT-B)

torsion

spring

(toggle)

Remove

claw

from

inside.

A

SN

2,

knob

OR)

ARM

(EJECT)

FITTING

torsion

spring

Hung

it

on

(toggle)

shaft

Put

it

through

the

hole.

Move

the

spring

twice

or

three

times.

CASSETTE

LID

(C)

FITTING

cassette

lid

(c)

cassette

lid

(c)

Hold

shaft

up

by

pushing

stop

button.

Put

the

stopper

portion

in

the

hole.

SECTION

3

ADJUSTMENTS

2-1.

MECHANICAL

ADJUSTMENTS

AND

MEASUREMENT

PRECAUTION

1.

Clean

the

following

parts

with

a

denatured-alcohol-moistened

swab:

record/playback/erase

head

_

pinch

roller

rubber

belts

capstan

2.

Demagnetize

the

record/playback

head

with

a

head

demagentizer.

Do

not

use

a

magnetized

screwdriver

for

the

adjustments.

4.

The

adjustments

should

be

performed

with

the

rated

power

supply

voltage

unless

otherwise

noted.

Power

supply

voltage

:

3

Vdc

TAPE

SPEED

switch

:

2.4cm

w&

Torque

Measurement

wr on

Tape

Tension

Measurement

Meter

|

Meter

Reading

more

than

30

g

CQ-403M

(more

than

0.42

02)

2-2.

ELECTRICAL

ADJUSTMENTS

5~13g

*cm

(0.07

—

0.1800z

«

inch)

more

than

15

g*

cm

(more

than

0.210z

¢

inch)

Test

Tape

[om

[eee

[ee

PR

3

kHz,

—

10

dB

WS-24

2.4

$-2-A030

|

3

kHz,

—

20

dB

|}

Head

Azimuth

Adjustment

Record/Playback

Head

Azimuth

Adjustment

Tape

Speed

Adjustment

setting:

VOLUME

control

:

mechanical

mid

TAPE

SPEED

switch

:

2.4cm/s

VOR

switch

:

OFF

Procedure:

1.

Mode:

playback

test

tape

S-2-A030

(3

kHz,

—

20

dB)

—

set

|

earphone

jack

2.

Turn

the

adjustment

screw

to

obtain

the

maximum

reading

on.

VTVM.

Note:

Several

peaks

may

appear,

but

the

maximum.

Adjustment

Location:

First

remove

the

cover

(azimuth).

bs

head

azimuth

adjustment

screw

Tape

Speed

adjustment

Setting:

VOLUME

control

:

mechanical

mid

VOR

switch

:

OFF

Procedure:

®@

Reform

2.4

cm

/s

speed

adjustment

before

1.2

cm/s

speed

adjustment

mode

:

playback

speed

checker

LFM-30

test

tape

or

WS-24:

tape

speed

2.4

cm

frequency

counter

WS-12:

tape

speed

1.2

cm

(3

kHz,

—

10dB)

earphone

jack

Tape

Speed

checker

requency

counter

3,000

+

90

Hz

Frequency

difference

between

the

beginning

and

the

end

of

the

tape

should

be

within

0.5%.

2.4cm/s

(15

Hz)

1.2

cm/s

(15

Hz)

Adjustment

Location:

RV601

1.20m

speed

adjustable

resistors

M-727V

SECTION

4

DIAGRAMS

e

Semiconductor

e

Semiconductor

Lead

Layouts

Location

7

4-1.

PRINTED

WIRING

BOARD

red

12

43

14 45

7

19

20

24

22

23

D101

D-12

XN4601

188335

i

—

4

__|

17

_

48

—

D-13

J102

D-11

DC

IN

3V

J-5

oS

5102

aide

$104

ee

ox

rs

[44__

FAST

PB]

[TAPE

SPEED]

S

CATHODE

[2.4cm|—>[1.2cm]

6-13

(MAIN

BOARD]

PB

aa

—

a

D-10

J103

E-10

F-10

J-9

DRY

BATTERY

K-10

XN4501

GL-8PR42

D

—

SIZE

"AA"

K-9

IEC

DES

GNATION

R6)

K-20

K-17

7

SPEAKER

K-19

G-14

E

L-18

J101

“

;

i

(PLUG

IN

POWER)

3

6 F

2

1

ANODE

CATHODE

jt

RED

6

wico0i

Ql

DA204U

|_|

ov

anode,

cathode

anode

H

MOTOR

|

RVIOL

cathode

anode

;

N.C.

\

4

J

HEAD

Note

on

Schematic

Diagram:

.

Ly

FLEXIBLE

e

All

capacitors

are

in

uF

unless

otherwise

noted.

pF:

ppyF

BOARD

50

WV

or

less

are

not

indicated

except

for

electrolytics

K

and

tantalums.

e

All

resistors

are

in

Q

and

%

W

or

less

unless

otherwise

|

specified.

e

—e+

:

printed

resistor.

7

{0}

e

:

B+

Line.

S103

e

({___]:

panel

designation.

vor]

e

[~~]

:

adjustment

for

repair.

M

®

Total

current

is

measured

with

no

cassette

installed.

EN

gE

lad

@

Power

voltage

is

dc

3

V

and

fed

with

regulated

dc

power

supply

I

from

external

power

voltage

jack.

@

Voltages

are

dc

with

respect

to

ground

under

no-signal

N

conditions.

|_|

no

mark:

PLAY

e

IC

Block

Diagrams

¢

):

REC

®

Voltages

are

taken

with

a

VOM

(10

MQ/V).

2

;

LAS521M

NJM2072M

Voltage

variations

may

be

noted

due

to

normal

production

eines

:

=

CONT

NC

VS

GND

INPUT

CG)

Vcc

e@

Signal

path.

(8)

@)

6)

)

x

:

PB

x»

:

REC

L

GAIN

CONT)

(7)

OUTPUT

2

Note

on

Printed

Wiring

Board:

AMP

OUT

@)

OUTPUT

|

®

o——:;

parts

extracted

from

the

component

side.

e

@

:

Through

hole.

Gye

e

:

Pattern

from

the

side

which

enables

seeing.

o

GNO@)

©)

TIME

CAP

®

©€----

;

Pattern

of

the

rear

side.

N

ce

e

{._]

:

printed

resistor

of

the

rear

side.

M-727V

4-2.

SCHEMATIC

DIAGRAM

1

2

3

4

=)

6

7

8

g

10

11

12 13

14

[B+]

5101

I

TP2

(POWER)

$

3.0V

O

\

R102

R103

RI29

fy

Sy

RON

,

sis

68

820

100

£102

ay

mdb

102

TP

re

0.047

PRE

AMP

9

J102

B

MIC9O1

po

>

3

rear

{ac

IN

3V

MIC

cit

°

oe

Ho

0.901

1P18

R104 R106

Fo]

gay

aneneay

Jt!

i

a

Ioe

ae

wn

1C1

01

“Ls

SIZE"AA"

wie

:

POWER

AMP

=

(IEC

DESIGNATION)

(PLUG

IN

POWER)

2PCS

3V

C10}

0.0047

C

B

121

Fae

ee

7

a

=

es

etl

ose

cz

‘

recrra

me

OTT

=

2

favy

ais

|

Lo]

O

Wy

het

o

[EAR]

HCB901

4

MEME

=

R119

0.001

|

wae

Ree

47

fl

TPS

me

{>

ERASE

xX

a:

Ho}

1-0

¢

Bay

S102

4/4

D

3

2st2412K

yy

oly

Y)reg

(CHASSIS)

nal

1P22

AGC

v_y¥

+—[o4

SP901

-

a701

PB—>

REC

1P7

ee

(|

“ee

ws

R

HEAD

VOR/CUE

MARKER

=

Fo]

SPEAKE

FLEX

|

BLE

SWITCHING

Q401,

702

LEO

DRIVE

BOARD

rs

+

M01

D401

MOTOR

GL8PR42

22

REC/BATT]

°:3¥

THP602

210/2700ppm/C

TPS

[2.4cn}—~[1.

Zen]

1

Q703

|

2501819A

1

SERVO

_|

SWITCHING

2.3

|

a401

(272)

1

XN4312

LL

Q302,

303

CUE

MARKER

SWITCHING

mo

Oo

&-

aso2

7a}

|

TP30

ft

XN4S14

I

F

$104

1/2)

'

:

TAPE

SPEED

2

I

4

o

$301

:

ag

CUE]

4,

13!

=

gi

2.9

(0)

FR

1C601

R306

FS)

,

0303

mo

LAS521M

roo

I

2saiaiaa

cats

R305

2

R307

0.1

47k

Bs

1

IC601|

.

MOTOR SERVO

er

aait

Q301

(2/2)

:

x01

|

TAPE

SPEED

cz04

+t

2.6

(0)

4.7

AV

Q301

MULTI

VIBRATOR

Q302

(2/2)

XN4514

Q304

VOR

SWITCHING

RV601,

602

[SPEED

ABJ.]

eo

ae

—10—

NOTE:

@

-XX

and

-X

mean

standardized

parts,

so

they

may

have

some

difference

from

the

original

one.

@

Color

Indication

of

Appearance

Example:

KNOB,

BALANCE

(WHITE)...

(RED)

* t

Parts

Color

(1)

GENERAL

SECTION

Parts

Cabinet’s

Color

SECTION

5

EXPLODED

VIEWS

®

Items

marked

“+”

are

not

stocked

since

they

are

seldom

required

for

routine

service.

Some

delay

should

be

anticipated

when

ordering

these

items.

@

The

mechanical

parts

with

no

reference

number

in

the

exploded

views

are

not

supplied.

Hardware

(#

mark)

list

and

accessories

and

packing

materials

are

given

in

the

last

of

the

electrical

parts

list.

20

Ref.

No.

Cm

GN

eH

Part

No.

3-318-203-51

3-914-944-01

3-914-945-01

3-318-203-72

3~914-938-01

3~914-950-01

3-914-930-01

3-831-441-XX

3-914-948-11

3-914-947-11

3-914-946~11

3-328-319-11

3-669-481-07

3-914-934-01

3-914~933-01

3~914-932-01

3-914-879-01

SP901

MIC901

Description

Remark

CABINET

(FRONT)

(C1)

ASSY

SPRING

(TOGGLE),

TORSION

ARM

(EJECT-B)

LID

(CO)

ASSY,

CASSETTE

KNOB

(F~PB)

(FAST

PB)

COVER

(AZIMUTH)

BRACKET

(MICROPHONE)

CUSHION

(MICROPHONE)

SCREW

(1.

7X3),

TAPPING

A-3016-595~-A

MAIN

BOARD,

COMPLETE

6

Description

Remark

Ref.

No.

Part

No.

SCREW

(B1.

7X12),

TAPPING

18

X-3368-595-1

BUTTON

(CUE)

19

3-914~-931-01

KNOB

(PAUSE~-B)

(PAUSE)

20

3-914-936-01

SCREW

(B1.

7X5),

TAPPING

21

X-3368-592-1

KNOB

(FR)

22

3-914-878-01

LID,

BATTERY

CASE

23

3-914-952-01

CUSHION

(BATTERY

CASE

LID)

*

24

3-914-949-0601

SPACER,

KNOB

*

25

3-914-937-01

BUTTON

(REC)

26

3~318-382-31

BUTTON

(PLAY)

*

27

BUTTON

(STOP)

28

3-342-156-51

STRAP,

HAND

29

3-914-929-01

(DIA.

1X10),

PARALLEL

*

30

3-914-958-31

SPRING

(B),

BATTERY

COIL

31

3-358-363-11

TERMINAL

(A),

BATTERY

MICSQ1

1-542-136-11

SPRING

(C),

KNOB

(VOR)

BATTERY

COIL

SPS01

1-344-657~12

SCREW

PAPER,

SHIELD

CABINET

(REAR)

PLATE,

BLIND

MICROPHONE,

ELECTRET

CONDENSER

SPEAKER

(3.

6CM)

(2)

MECHANISM

SECTION

(MZ-627V-14)

&

SESS

67

oe

>

RZ.

ae

p

va

ee

eee

a

ay

M901

Ref.

No.

Part

No.

Description

Remark

Ref.

No.

Part

No.

Description

Remark

51

3-704-243-11

SCREW

(P1.

7X2.

0)

68

3-704-245-42

SCREW

(P1.

4X3.

0)

*

52

3-914-920-01

PLATE

(FR),

LOCK

69

3-378-792-01

SPRING,

COMPRESSION

*

53

3-914-919-01

SLIDER

(FR)

70

3-914-914-01

GUIDE,

TAPE

54

3-377-420-11

BELT

*

71

3-914-913-01

LEVER

(PLAY)

55

X-3368-702-1

FLYWHEEL

(1.3)

ASSY

72

X-3368-585-1

PINCH

LEVER

ASSY

56

3-914-903-01

SPRING

(FR),

TORSION

73

3-350-945-11

WASHER

*

57

X-3368-486-1

LEVER

(STOP)

ASSY

74

3-914-902-01

SPRING

(P),

TORSION

58

3-914-906-01

SPRING

(S.

OFF),

TORSION

75

3-914-904-01

SPRING

(PFR),

TORSION

59

3-914-915-01

ARM

(S.

OFF)

76

X-3368-584-1

ARM

(MIDWAY

GEAR)

ASSY

60

X-3368-582-1

REEL

ASSY,

T

77

3-331-007-21

WASHER

61

3-343-948-01

BELT

78

3-914-916-01

ARM

(CKAW

DETECTION)

62

1-548-579-21

COUNTER,

TAPE

(SMALL

TYPE)

79

X-3368-587-1

REEL

ASSY,

S

*

6§3

3-914-923-01

COVER,

MD

80

3-914-907-01

SPRING

(MIDWAY

GEAR),

TORSION

64

3-366-892-11

SCREW

(M1.

4X1.

4)

*

81

X-3368-701-1

CHASSIS

(COMP.)

ASSY

(C),

MECH

65

3-914-908-01

SPRING

(REC

LOCK),

TENSION

HCB901

1-500-135-11

HEAD,

MAGNETIC

(REC/PB/ERASE)

*

66

X-3368-583-1

LEVER

(REC)

ASSY

M901

1-698-384-11

MOTOR,

DC

67

3-703-816-82

SCREW

(M1.

4X6.0),

SPECIAL

HEAD

—12—

Sony M-727V User manual

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