Panasonic Rq-j20x User manual

ORDER

NO.

ARD82080186C2-09

Service

Manual

Mini

Cassette

World's

First

dbx

-Equipped

RQ-J2

OX

Stereo

Cassette

Player

(Dark

Gray)

This

is

the

Service

Manual

for

the

following

areas.

sage

aaa

For

all

European

areas.

RQ-2720

MECHANISM

SERIES

Specifications

Power

requirements:

AC;

with

optional

AC

adaptor

RP-31

Battery;

3V

(two

R6

size

dry

batteries)

Rechargeable

battery;

with

optional

rechargeable

battery

pack

RP-009

Track

system:

4-track

2-channel

stereo

playback

with

included

stereo

headphones

Tape

speed:

4.8cm/s

Dynamic

range:

More

than

97

dB

(at

1kHz),

with

dbx

in

Signal-to-noise

ratio:

dbx

in;

81dB

dbx

out;

56dB

(A

weighted,

3%

THD

at

1

kHz)

Fast

forward

and

rewind

time:

Approx.

120

seconds

with

C-60

cassette

tape

Input:

DC

in;

3V

Output:

Headphones;

output

level

630

mV

(162)/CH

Head:

1

LH

head

for

stereo

playback

Dimensions:

88.0mm(W)

X

138.0mm(H)

x

27.1mm(D)

Weight:

340

g,

without

batteries

Specifications

are

subject

to

change

without

notice

*

The

term

dbx

is

a

registered

trademark

of

dbx

Inc.

Pas)

a *

5

Panasonic

Metab

Sects

hatyee

te

nL

OLN

10>

CONTENTS

ITEM

PAGE

ITEM

PAGE

LOCATION

OF

CONTROLS

AND

COMPONENTS

:--

2

SCHEMATIC

DIAGRAM

cvrresserrereeeceeeceeeectete

reece

ones

9

DISASSEMBLY

INSTRUCTIONS

-=-+++-++*+--+++-+++++<-

2

CIRCUIT

BOARDS

AND

WIRING

CHIP

PARTS

REPAIR

PROCEDURE

<-*:-:***eeeeeee+*

el

CONNEGTION

DIAGRAM

cjsecssessesseeonsesmrsce

mn

ccene

11

MEASUREMENT

AND

ADJUSTMENT

MECHANICAL

PARTS

LOCATION

c-r-rerereereeeer

teres

15

MAE

TOUS

ese

ee

toc

cSt

oneteiacdansuweievesseuenasents

4

SPRING

LOCATION

Si

Gecteee-essssicstansessssenenacsvviees

17

ELECTRICAL

PARTS

LOCATION

srrrereeeeeeeeeeteeeeees

6

CABINET

PARTS

LOCATION

2i-ce0tGeiersdectectasccss

18

BOC

DING

RING

oats

ete

neccarsicesnoneonscncsances

7

LOCATION

OF

CONTROLS

AND

COMPONENTS

@

dbx

IN/OUT

switch

@

Playback

button

@®

Fast

forward/cue

button

@®

Rewind/review

button

®

Stop/eject

button

©

Built-in

microphone

@

Battery-check

lamp

@®

Headphones

jack

@

Tape

selector

(Metal

L/Metal

H,

Normal

L/

Normal

H)

Pause/mic

on

switch

@

Volume

control

@

Cassette

compartment

cover

@®

Battery

cover

DC

IN

jack

DISASSEMBLY

INSTRUCTIONS

Bottom

case

y

24assembly

ROQ-J20X

is

I

|

Fr

1

(IW

Epc!

Cassette

_"—_———

_

compartment

T

eat

SO

eel

|

Fig.

4

Procedure

To

remove

——

Remove

——

Shown

in

fig.

——

.

-

Battery

cover

1

+

2

screws

1

+

3

black

screws

2

-

As

shown

in

fig.

1,

push

the

claw

in

the

direction

of

arrow

©,

then

lift

bottom

case

assembly

in

the

direction

of

arrow

@).

Bottom

case

assembly

+

2

screws

*

1

red

screw

-

First,

press

the

stop/eject

button,

and

open

the

cassette

compartment

cover.

Main

case

assembly

Press

the

playback

button,

and

push

the

mechanical

assembly

up

in

the

direction

of

arrow

@)

while

pulling

portion

@)

in

the

direction

of

arrow

@),

as

shown

in

Fig.

3.

Then,

the

main

case

assembly

can

be

removed.

>

1

red

screw

+

2

screws

+

2

black

screws

-

Unsolder

the

soldered

portion

of

the

brush

holder

assembly

CHIP

PARTS

REPAIR

PROCEDURE

(transistor,

diode,

resistor

and

capacitor,

etc.)

Main

circuit

board

and

motor

governor

circuit

board

A.

Removal

1.

Remove

all

solder

from

both

ends

of

chip

using

a

solder

sucker

(RP8062)

or

desoldering

wick.

Tweezers

2.

While

the

chip

is

hot

remove

it

by

turning

with

tweezers,

as

shown

in

fig.

1.

*

Make

sure

that

the

unit

is

turned

OFF

when

checking

the

resistance

and

polarity

of

a

chip.

Soldering

iron

Unsolder

B.

Mounting

Place

solder

on

the

foil

chip

mounting,

and

solder

the

chip

while

applying

Soldering

iron

the

soldering

iron

in

the

direction

of

the

arrow,

as

shown

in

the

diagram

y

&

(point

must

(fig.

2).

be

clean)

Fig.

2

Solder

C.

Precautions

in

mounting

the

chip

1.

Do

not

heat

the

chip

beyond

3

seconds.

2.

Do

not

rub the

electrode.

3.

Use

tweezers

to

prevent

any

damage

to

the

surface.

4.

It

is

recommended

that

a

pencil-type

soldering

iron

be

used.

5.

Maintain

temperature

control

under

260°C

(500°F)

when

soldering.

*

Chip

resistance

(of

not

more

than

100Q)

may

vary

greatly

with

the

direction

of

mounting;

therefore,

mount

the

white

side

on

the

pattern

side.

6.

Do

not

re-use

the

tantalum

capacitors

or

ceramic

capacitors

after

removal

(use

new

components).

7.

Do

not

subject

the

components

(chips)

to

excessive

stress.

ok,

3

—

RO-J20X

MEASUREMENT

AND

ADJUSTMENT

METHODS

Condition:

Equipment:

*

VTVM

*

Stereo

M3

Tape

speed

adjustment

Condition:

Equipment:

*

Test

tape-

*

Stereo

M3

adjustment

Condition:

Equipment:

*

VTVM

*

Test

tape

-

Head

azimuth

adjustment

*

Playback

mode

*

Test

tape

(azimuth)

*

Resistor

(16Q)

*

Playback

mode

*

Digital

electronic

counter

or

frequency

counter

++

QZZCWAT

*

Resistor

(16Q)

Attack

recovery

time

*

Playback

mode

«+

QZZCFM

NOTES:

@

Make

sure

head

is

clean.

@

Make

sure

capstan

and

pressure

roller

are

clean.

e

Judgeable

room

temperature:

20£5°C

(68+9°F)

ITEM

MEASUREMENT

&

ADJUSTMENT

L-CH/R-CH

output

balance

adjustment

1.

Make

connections

as

shown

in

fig.

1

and

2.

Playback

the

8

kHz

signal

from

the

test

tape

(QZZCFM).

Adjust

screw

(B)

in

fig.

3

for

maximum

output

L-CH

and

R-CH

levels.

When

the

output

levels

of

L-CH

and

R-CH

are

not

at

maximum

at

the

same

time,

readjust

as

follows.

Turn

the

screw

shown

in

fig.

3

to

find

angles

A

and

C

(points

where

peak

output

levels

for

left

and

right

channels

are

obtained).

Then,

locate

the

angle

B

between

angles

A

and

C,

i.e.,

a

point

where

L-CH

and

R-CH

output

levels

come

together

at

maximum

(Refer

to

figs.

3

and

4).

*

Oscilloscope

+++

QZZCFM

plug

L-CH/R-CH

phase

adjustment

4.

Make

connections

as

shown

in

fig.

2

and

5.

and

a

waveform

as

illustrated

in

fig.

6

is

obtained

on

L-CH

peak

level

R-CH

peak

level

accuracy

Tape

speed

accuracy

1.

Test

equipment

connection

is

shown

in

fig.

2

and

7.

2,

playback

signal

to

frequency

counter.

3.

Take

measurement

at

middle

section

of

test

tape.

4.

Measure

this

frequency.

5

f—3,000

3,000

where,

f

=measured

value

“e

Tape

speed

accuracy

=

Standard

value:

+2.5%

.

If

measured

value

is

not

within

standard,

adjust

tape

location),

so

that

frequency

becomes

3,000

Hz.

Test

equipment

connection

is

shown

in

fig.

8.

Set

dbx

switch

to

IN.

Playback

the

test

tape

(QZZCFM:

315Hz/0

dB).

Read

voltage

on

VTVM.

PWN

Reference

value:

15+0.5mvV

Playback

head

UNIT

Dummy

\y

2

load

(16.2)

iB

Sees

-

r

S

eee

Insert

A

Dummy

i i

load

(160)

Shield

wire’

Black

R-CH

5.

Playback

the

8kHz

signal

from

the

test

tape

(QZZCFM).

(B)

shown

in

fig.

3

so

that

pointers

of

the

two

VTVMs

swing

to

maximum

Playback

test

tape

(QZZCWAT

3,000Hz),

and

supply

.

On

the

basis

of

3,000Hz,

determine

value

by

following

formula:

X

100

(%)

e

Volume

control:

Maximum

©

Tape

select

switch:

Normal

(Hi)

@

Pause

switch:

OFF

©

dbx

switch:

OUT

Headphones

jack

Es

ee

16

Playback

mode

Fig.

1

a

“VIVM

Oseilloscope

Shield

wire

L-CH

Fig.

2

c

Playback

head

\

Adjust

screw

A

Screw

(B)

Fig.

3

the

oscilloscope.

jack

Playback

mode

Digital

electronic

counter

Fig.

7

speed

adjustment

VR

(shown

in

electrical

parts

ITEM

MEASUREMENT

&

ADJUSTMENT

Level

difference

adjustment

for

pre-amp

and

dbx

IC

(AN6291)

1.

Test

equipment

connection

is

shown

in

fig.

9.

2.

Set

volume

control

(VR2)

to

maximum

and

dbx

switch

to

IN.

3.

Playback

the

test

tape

(QZZCFM:

315Hz/O

dB),

and

using

VTVM

measure

the

output

level.

Channel

balance

adjustment

Condition:

*

Playback

mode

Equipment:

+

VTVM

*

Test

tape

---

VR2-1

(L-CH)

—O-

Ground

—_

VR2-2

QZZCFM

<©—

<9

(R-CH)

"y

.

Perform

measurement

for

both

channels.

.

Check

that

the

measured

values

for

both

channels

are

in

a

range

of

22.4mV

(—33dB)

to

31.6mV

(—30<B),

and

that

the

level

difference

between

channels

is

3

dB

or

:

less.

Fig.

9

.

lf

the

measured

values

do

not

meet

the

above

requirements,

the

following

adjustment

is

required.

The

playback

output

and

level

difference

between

channels

of

the

RQ-J20X

can

be

adjusted

by

control-

ling

the

playback

gain

of

the

pre-amp.

Procedure:

L-CH

and

R-CH

playback

gains

change

as

shown

in

table

1

according

to

open/short

circuit

at

connection

points

®),

©,

©

and

@

on

the

main

circuit

board

(fig.

10).

For

level

difference

adjustment,

open

or

short

the

connection

points

by

soldering

so

that

the

output

level

difference

between

L-CH

and

R-CH

is

minimal.

Connection

point

Connection

point

©

Connection

point

©

Open

Short

Open

Short

—_—_}—__

Open

Short

Open

R-CH

output

level

2dB

up

4dB

up

6

dB

up

9dB

up

Connection

point

©

Open

SEER

Connection

point

©

Connection

point

@

L-CH

output

level

Open

Short

Open

Short

Open

Short

Open

2

dB

up

4dB

up

6

dB

up

9dB

up

Table

1

we

(Se

GD

omc

point

©

R

|

oe

re

we

Se

Connection

point

©.

Connection

point

©)

Main

circuit

board

(back

side)

Connection

point

@)

Connection

point

©

Connection

point

Connection

point

©

Fig.

10

Level

difference

adjustment

for

headphones-amp

.

Test

equipment

connection

is

shown

in

fig.

1

and

2.

.

Set

volume

control

to

5,

tape

selection

switch

to

normal

(Hi)

and

dbx

switch

to

OUT.

.

Playback

frequency

response

test

tape

(QZZCFM),

and

using

VTVM

measure

the

output

level

at

headphones

jack.

.

Make

measurement

for

both

channels.

.

Check

output

if

level

difference

between

L-CH

and

R-CH

is

within

2

dB.

L-CH

output

level

—

R-CH

output

level

=

+2dB

If

the

measurement

value

do

not

meet

the

standard

value

range,

adjust

as

described

below.

.

L+CH

and

R-CH

playback

output

balance

adjustment

of

RQ-J20X

is

done

by

adjusting

the

gain

of

the

L-CH

and

R-CH

headphones

amplifier.

Procedure:

L-CH

and

R-CH

output

level

changes

as

shown

in

table

2

by

opening

or

shorting

connection

points

@)

and

©

on

the

main

circuit

board

(fig.

10)

by

soldering.

So

open

or

short

the

connection

points

so

that

the

output

level

difference

between

L-CH

and

R-CH

is

minimized.

Channel

balance

adjustment

Condition:

*

Playback

mode

Equipment:

*

VTVM

*

Oscilloscope

*

Test

tape

---

QZZCFM

*

Stereo

M3

plug

*

Resistor

(16Q)

Connection

point

@

R-CH

output

level

Connection

point

@)

L-CH

output

level

Open

Up

Open

Up

t t

Short

Table

2

Confirmation

of

dbx

decode

effect

Condition:

*

Playback

mode

Equipment:

*VTVM

*

ATT

*

AF

oscillator

*

Stereo

M3

plug

.

Supply

315

Hz

signal

from

AF

oscillator

through

4

estilator

.

Remove

three

lead

wires

of

head

by

desoldering.

.

Test

equipment

connection

is

shown

in

fig.

2

and

11.

.

Set

dbx

switch

to

IN.

.

Load

a

cassette

tape

(to

defeat

auto-stop

function),

and

set

the

unit

to

playback

mode.

=

ATT

(for

—78dB

attenuation)

to

head

lead

wire

terminal

(on

FPC)

(for

both

channels)

as

shown

Head

lead

wire

terminal

Headphones

jack

Playback

mode

*

Resistor

(16.Q)

in

fig.

12.

control

(VR2).

signals

are

inputted.

.

At

this

time,

measure

output

level,

and

adjust

measured

value

to

50

mV

by

adjusting

volume

.

Next,

attenuate

315

Hz

signal

by

—66dB

and

—86

dB,

and

measure

output

levels

when

these

.

Perform

measurement

for

both

channels.

.

Check

that

the

measured

values

meet

the

requirements

in

the

dbx

decode

eftect

table.

dbx

decode

effect

table

Input

signal

|

Measured

value

~76dB

(315Hz)

|

OdB

(50

mV)

—66

dB

(315Hz)

|

+2043

dB

(500mvV)

—86

dB

(315Hz)

ELECTRICAL

PARTS

LOCATION

REPLACEMENT

PARTS

LIST

Part

Name

&

Description

ELECTRICAL

PARTS

E1

QWY4142Y

Playback

Head

E2

QES1533

Brush

Holder

Assembly

E3

WM034BZ103

Condenser

Microphone

E4

QKJ0502

Microphone

Holder

E5

QKJ0501

Holder

E6

QGT1562

Switch

Knob

(for

Pause)

E7

QYTO639W

Volume

Knob

E8

QQC1735

Shelter

EQ

QTS1590

Shield

Plate

E

10

QBHO0081

Insulating

Sheet

Et

QTD1258

Lug

Terminal

E

12

XQN16+A3FZ

Screw

@1.6x3

E13

XQN16

+

A35FR

Screw

@1.6x3.5

E14

XQN16+C4FY

Screw

@1.6x4

E15

XTNQI6C4FFR

Screw

@1.6x4

E16

QHQ1320

Step

Screw

E17

-

QBH0180

Protection

Sheet

E

18

QYT0654

Switch

Knob

(for

dbx)

E19

XTNQ16C28F

Tapping

Screw

@1.6x2.8

E

20

XTNQ16A3F

Screw

@1.6x3

E21

QTW1242

Insulating

Sheet

—20+3dB

(5mV)

E20

E5

£19

6002

Main

circuit

board

(back

side)

Fig.

12

Ett

‘E13

E18

E12

E15

E9

EA,

E16

Tape

speed

adjustment

VR

BLOCK

DIAGRAM

B+ B+

(2.8V)

(28V)

DE

EMPHASIS

(dbx)

$62

S71

i

=

z

Output

level

O

contro!

CR

BETWEES

CR

NETWORK

:

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ad

=

=>

==

ON:

|

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RMSIN

[TIMING

|CCAIN

|caP1

cAP2

v

ouT

OFF

I

TIME

ENCODE

RMS

‘aA

4

DETECTOR

CONNECTION

POINTS

C)

|

MUTING

(FORCHANNEL

BALANCE

—

(iii

E

Of

Le

EH

HH

(FOR

P.B

ADJUSTMENT)

=

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Logic

out)

a7,8

PLAYBACK

HEAD

P.BEQ

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til

$7-3

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VR

v-0

v=

|

Output

level

CONNECTION

POINTS

Jey

Control

(FOR

CHANNEL

BALANCE

ADJUSTMENT)

De

EMPHASIS

(Gon)

;

|

1

=

ly

4

+

———

|

(2.8V)

[=e

Sa

ul

i

eS

SS

te

i

sw

7

D

!

ELECTRET

CONDENSER

CONNECTION

POINT

(H)

MICROPHONE

i]

[J]

a

Qi0

+

gies

MICROPHONE

MUTING

(FOR

P.B

OUT)

Qn

POWER

ON/OFF

(FOR

MOTOR)

J

MOTOR

GOVERNOR

CIRCUIT

MOTOR

WITH

MOTOR

GOVERNOR

CIRCUIT

BOARD

\C3

AN6257

AUTO

STOP

CONTROL

(FOR

CHANNEL

BALANCE

ADJUSTMENT)

“AN

WD

POWER

STAGE

1C2

BAF5204

POWER

AMP

HEADPHONES

JACK

fae

Ns

W\—{1DConnecrion

Point

(1)

(FOR

CHANNEL

BALANCE

ADJUSTMENT)

O

OC

IN

JACK

O

Q——=!

“ake

mel

BATTERY

(3V)

=

Ce

ee

ro

7

NOTES:

ROTARY

SWITCH

(ROTATING

DETECTION).

PLAYBACK

SWITCH

(shown

in

OFF

position).

.-FAST

FORWARD/REWIND

SWITCH

(shown

in

OFF

position).

..POWER

ON/OFF

SWITCH

(shown

in

OFF

position).

..

TAPE

SELECT

SWITCH

((1)

Normal

Hi,

(2)

Normal

Low:

Metal

Hi,

(3)

Metal

Low).

..dbx

IN/OUT

SWITCH

(shown

in

IN

position:

(4)

OUT,

(6)

IN).

PAUSE

&

MIC

SWITCH

(shown

in

OFF

position).

(

==>)

this

arrow

indicates

the

flow

of

the

playback

signal.

(

---B

)

this

arrow

indicates

the

flow

of

the

control

signal.

—-7-—

S2

$3.

S4.

$5.

S6.

ROQ-J20X

NOTES:

RESISTORS

CAPACITORS

ERD...Carbon

EGBA:

<<

i.33

Ceramic

ECEON

ERG...Metal-oxide

ECGD......

Ceramic

ECOS

2...

Polystyrene

ERS

...Metal-oxide

ECKD......Ceramic

ECSO......Tantalum

ERO...Metal-film

ECCBe..03.

Ceramic

QCS

sis.

Tantalum

ERX

...Metal-film

EGED

5.22

Ceramic

CHIP

RESISTORS

ERQ...Fuse

type

metallic

ECQM......Polyester

film

RRD

......

Carbon

ERC...Solid

ECOQE

......Polyester

film

CHIP

CAPACITORS

ERF

...Cement

ECOQF

......Polypropylene

QCUD......

Ceramic

ECEO......Electrolytic

ECSE

......Tantalum

REPLACEMENT

PARTS

LIST

reine

[penne

|

woe

|

Part

No.

Ref

No.

...Non

polar

electrolytic

Part

No.

TERMINATIONS

RESISTORS

|

VARIABLE

RESISTORS

j

C55

ECEA1CK100

fa?

a

arama

(011.

ECEAOGK221

R1,2

RRD18XJ273

VR

1

QVM42TB2228A

|

C

57

ECEAOGK470

R3,

4

RRD18XJ564

VR2

QVBL1HC03A24

|

C58

ECEA0GK221

R5,6

RRD18XJ153

©

59,60

ECEAQJK220

R7,8

RRD18XJ102

CAPACITORS

cé1

ECEA1CK100

RQ,

10

RRD18XJ471

=...

C62

ECEAQJV471

R11,12

RRD18XJ271

Cae

ECSF1VM474

C63

ECEA0GK221

R13,14

RRD18XJ121

C3,

4

QCUT1H102MRL

|

C

64

QCUT1H102MRL

A

R15,16

RRD18XJ124

C5,6

QCUT1H471MRL|

C

65

QCUT1H332MRL

|

Anode

O—Pt—O

Cathode

R17,18

RRD18XJ564

C7,8

ECEA1HKR47

R19,20

RRD18XJ332

C9,

10

QCUX1E333KRX

TRANSISTORS

D4

R21,22

RRD18XJ152

C

11,12

ECEA1HKR33

dad

Mee

R

23,24

RRD18XJ472

C13

ECSF1CM474

Q

1,

2, 3,

4,

5,

6,

7,

8,

10

Chip

Resistor

R25,26

RRD18XJ123

C14

ECEA1HKR47

2802412

R

27,28

RRD18XJ560

C

15,16

QCUX1E333JRX

|

Q11

2SA1037

Black

R

29,30

RRD18XJ561

C

17,18

ECEA16z10

Q

12

2802412

R31,32

RRD18XJ102

C

19,20

ECEAOGK470

Q13

2SA1037

1

|

R

33,34

RRD18XJ103

C

21,22

QCUTIH472JRL

|

Q

14

2802412

R35,

36

©

RRD18XJ163

C

23,24

QCUTIE223JRL

|

Q

15,16

2SA1037

—\M—

R

37,38

RRDI8XJ151

C

25,26

ECSFICM474

R

39,40

RRD18XU472

C

27,28

QCUT1H152MRL|

DIODES

&

RECTIFIERS

|

R41,42

RRD18XJ163

C

29,30

ECEAOGK470

ee

Chip

Capacitor

R

43,44

RRD18XJ122

C

31,32

ECEAOGK101

D1

SLR34UR

Ceramic

R45,46

RRD18XJ121

©

33,34.

QCUT1H103MRL}

D

2,3

DAN202TB

Bown

R

47,48

RRD18XJ680

C

35,36

QCUT1H102MRL|

D4

SM112

7

>

R

49,50

RRD18XJ332

C

37,38

=

_ECEAOGK470

KZ]

R

53,54

RRD18XJ822

C

39,40

QCUT1H102MRL|

INTEGRATED

CIRCUITS

Qi—8.

10,

|

Q11,

13,

R55,56

RRDI8XK4R7

C50

QCUT1E104ZFL

|

SSS

42.14 15.16

te

R59,60

RRDI8XJ102

C

51,52

ECEAOGK101

IC

1

AN6291S

: ’

R70

RRD18XJ222

C53

ECEA0JK220

IC

2

BAF5204LN

R71

RRD18XJ102

ECEA1HK010

IC

3

AN6257S

R72

RRD18XJ121

SPECIFICATIONS

R73

RRD18XJ104

R74

RRD18XJ820

ame

R75

RRD18XJ273

—

dbx

OUT

—

R76

RRD18XJ153

:

R77

RRD18XJ102

SWITCHES

315H2:

0dB

(30mV)

R78

RRD18XJ391

oe

beeoieas

125Hz:

—0.5+2dB

R79

RRD18XJ820

refer

to

:

+

oT

aed

epee

C

asiceiea

Gis

Playback

frequency

response

|

8kH7z:

0.5+3dB

R81

RRD18XJ331

(Rotary

Detector)

*

Use

test

tape

—

dbx

IN—

R

83

RRD18XJ471

$

2,3,4

QSB0274

Leaf

Switch

++

QZZCFM

R

84

RRD18XJ820

(Play,

FF/REW,

Power

ON/OFF)

315Hz:

OdB

(3mV)

R85

RRD18XJ102

$5,6

QSS2302

Slide

Switch

125Hz:

—1+3dB

R

86

RRD18XJ822

(Tape

Setector,

dbx

IN/OUT)

Zz

-—

R

87

RRD18XK330

S7

Qss4214

Slide

Switch

8kHz:

9+5dB

R

88

RRD18XJ123

(Pause/Mic

ON)

R89

RRD18XJ104

R

90

RRD18XJ682

JACKS

Playback

gain

R91

RRD18XJ102

R

92

RRD18XJ222

QJA0173

M3

Jack

*

Use

test

tape

Greater

than

0.64

V

R93

ERD25FJ3R7

QUA0164

DC

IN

Jack

+++

QZZCFM

(315Hz/0dB)

NOTES

.

SSA

cnscaseetraran

Rotary

detection

switch.

Headphones

jack

©:

S25

tarcuawnerarcanie

Playback

ON/OFF

switch

(shown

in

OFF

position).

FF/REW

ON/OFF

switch

(shown

in

OFF

position).

iv

...Power

ON/OFF

switch

(Shown

in

OFF

position).

85245

S5

2

iciicensies

Tape

select

switch

(shown

in

NORMAL

(Hi)

position).

(1)...Normal

(Hi)

(2)...Normal

(Low)

&

Metal

(Hi)

(3)...Metal

(Low)

SOisisnsewtigavicuarsy

dbx

IN/OUT

switch

(shown

in

OUT

position).

$7-1—S7-4

......

PAUSE/MIC

ON/OFF

switch

(shown

in

OFF

position).

METT

semtacattexcinnd

Attack

recovery

time

adjustment

VR.

VR24

252:

cawcirs

Volume

controls.

Connection

points

(B),

(C), (D),

(E),

(F),

(G)...For

channel balance

adjustment

points.

Connection

points

(H),

(I)...For

output

balance

adjustment

points.

Resistance

are

in

ohms

(82),

1/8

watt

unless

specified

otherwise.

1K

=

1,000(2),

1M

=

1,000

K(é2).

Capacity

are

in

microfarads

(uF)

unless

specified

otherwise.

P

=

Pico-farads.

All

voltage

values

shown

in

circuitry

are

under

nosignal

condition

and

volume

control

at

minimum

position.

Unless

otherwise

specified,

voltage

measurement

conditions

are

that

tape

travels

is

at

PLAY,

tape

mode

at

NORMAL

(Hi),

and

dbx

switch

at

OUT.

NO

MARK

.Voltage

at

playback

mode.

(

WY

Sy

shacgons

Voltage

value

at

IN

(dbx

switch)

mode.

(

[=>

)

this

arrow

indicates

the

flow

of

the

playback

signal.

(

E>

)

this

arrow

indicates

the

flow

of

the

talk

signal.

(

tp

)

this

arrow

indicates

the

flow

of

the

playback

and

talk

signal

in

combination.

—s-

Playback

head

162

Playback

mode

Fig.

1

Dummy

Shield

wire

L-CH

load

(16.2)

Dummy

peers

=

White

Insert

Shield

wire

load

(160)

Black

R-CH

Fig.

2

©

Described

in

schematic

diagram

are

two

types

of

numbers;

the

supply

parts

number

and

production

parts

number

for

transistors

and

diodes.

One

type

number

is

used

for

supply

parts

number

and

production

parts

number

which

they

are

identical.

eg.

Q1

2SC2412LN(R,S,E)——Production

parts

number

[28C2412]

Supply

parts

number

¢

The

supply

parts

number

is

described

alone

in

the

replacement

parts

list.

¢

This

schematic

diagram

may

be

modified

at

any

time

with

the

development

of

new

technology.

PLAYBACK

HEAD

L-CH

>

|

a

(QWY4142Y)

PLAYBACK

HEAD

R-CH

>

|

ELECTRET

CONDENSER

MICROPHONE

(Red)

1

SCHEMATIC

DIAGRAM

2

SS

0

Qi,

2

Qi0

Q3,

4,

5,

6

2SC2412LN

28C2412

2SC2412

(R,

S, E)

(R,

S)

(R,

S)

[2802412]

[2sc2412]

_[28C2412]

B+

2.7V

IE

—S

vw

4

RIS

120K

27K

C64

Co

onnection

70.001

Connection\

Point

(F)

age

Point

(G)

\

[A]

Connection

Point

(E)

R70

2.2K

RE

15K

_

R4_

560K

Wak

C2

57

aii

35V0.47

=>

in

0.26V%7

Q4

|s00V

~

J

R16

120K

eee

9

Se

9

SD

4

5

eS

8

6

ES

8

IC1

Q7,

8

AN6291S

28C2412

36-2

(R,

S)

Connection\

Connection

R20.

3.3K

i

Point

(C)

Point

(D)

i

(C)

ae

Connection

Point

(B)

:

R24

4.7K

¢50

0.1

sis

R43

1.2K

[2802412]

I

C27

0.0015

4V220)

pas

120

R46

120

$5-2

Yov

Qs

ne

R78

390

$7-2

—-———_

<

a

bdo

MOTOR

GOVERNOR

CIRCUIT

,

Vec

O

o>

C2

©

b

.

8

s

OY

=

a

ccna

Se

eee

CY

Y 1

Ica

1

+@%

‘(De

ey

2

O—O

7

OVE

Tape

speed

.

Det

‘

adjustment

VR

}

GND

|

O

°°

eS

SS

A

MOTOR

ASS’Y

(with

Motor

Governor

Circuit)

[MHE3S3RB]

|

C66

0.00!

it

$1

<<

_

67

0,00

Li

Cathode

Resistor

‘apacitor

‘amic

own

tH-

x

OUT

—

OdB

(30

mV)

—05+2dB

0.5+3dB

lbx

IN

—

0dB

(3mV)

—1+43dB

9+5dB

than

0.64

V

oscope

oH

Dummy

Bioad

(160)

Dummy

load

(160)

CH

3;

the

supply

and

diodes.

duction

parts

iment

parts

t

any

time

SCHEMATIC

DIAGRAM

Q1,2

Qi0

Q3,

4,

5,

6

Qi1

A

2SC2412LN

28C2412

2802412

2SA1037

H

(R,

S,

E)

(R,

S)

(R,

S)

(R,

S)

[2802412]

[282412]

[28C2412]

[2SA1037]

B+

2.5V

:

B+

2.7V

R72

120

Cll

R31

50V0.33

1K

cl

ci3

PLAYBACK

HEAD

350,47

16V0.47

O——->

7

;

L-CH

—>

kp

*

|

(QWY4142Y)

B

a

R7S

RIS

RI

2K

|

KS

4702

270

ico

rani

Connection

T2033

gig

:

Connection\

Point

(F)

3.3K

oe

Point

(G)

®

Connection

Ray

Lok

Point

(E)

M—®Q

©

R23.

47K

GY

g5-1

R70

2.2K

C

cig

R32

1K

50V0.47

F

“*

"R34

10K

PLAYBACK

HEAD

aeuear

O—aa>

ee

R-CH

—>

kb

©

D

;

Connection

i

Point

(C

Point

(D)

:

(C)

eomeisk

Connection

Point

(B)

Q®

©

;

R26

47K

Gy

55-9

ELECTRET

CONDENSER

MICROPHONE

$50

E

F

MOTOR

ASS’Y

(with

Motor

Governor

Circuit)

[MHE3S3RB]

1C1

AN6291S

MOTOR

GOVERNOR

CIRCUIT

Tape

speed

adjustment

VR

Q7,

8

Q16

2802412 2SA1037

(R,

S)

(R,

S)

[2802412] [2SA1037]

C66

0.0015

C67

0.0015

©

VR2-1

20K

(A)

©

LTO

N

20K

(A)

C.

AN6257S

|

ccameaeneamesenil

Ty

vii

)

@)

(2)

@)

4)

wr

R80

220

=@)

POWER

ON

RESET

(3)

D2,

3

Q13

Ic2

Q12,

14

DAN202TB

2SA1037.

+—-

BAF5204LN

~—s-_-

282412

(R,

S)

[28A1037]

(R,

S)

[2802412]

R54

8.2K

R53

8.2K

R50.

3.3K

wi

Qi5

2SA1037

(R,

S)

[2SA1037]

C62

6V470

+

Fes

ayero

|

4v220

R86

8.2K

R49

3.3K

oo

C61

+

16V10

R89

100K

a30V

D4

1SR35200

[SM112]

Connection

Point

(1)

C40

==

0,001

C65

0.0033

Connection

Point

(H)

5

—~,

3)

eae

ae

1)

039

Jt:

0.001

PHONES

J2:

,

DC

IN

(3V)

RECHARG|EABLE

BATTERY,

BATTERIY

(3.0V)

©

8

1

6

(©

bre

p40)

Game

»

{

©

bw

4

OD

4

5

CIRCUIT

BOARDS

AND

WIRING

CONNECTION

DIAGRAM

BACK

SIDE

VIEW

MOTOR

GOVERNOR

=

CIRCUIT

BOARD

ea

Sol

Ujs0SeFA8

e|

V8.8

{I

d|

Ve.l

s

€

ny

ro

ero

sro

ero

yeorAes

srasdes

yeorAes

srasdes

[vo.e

[8]

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vv.s

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vo.e

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BATTERY

TERMINAL

(—

BATTERY

BOX

TL

RECHARGEABLE

BATTERY

|

TERMINAL

fee

ee

aij

Connection

Point

(1)

Connection

Point

(H)

Example

Components

on

Back

of

P.B

“ar”

Back

P.B

pattern

Components

on

front

of

P.B

Front

P.B

pattern

—l-—

—ti-

a

%

Neh

Peale)!

BE

o)

)

wetter

7°!

ae

+

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No

et

en

a

1\

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Sone

E

|

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HEAD

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We

r9w04:

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Ul

yeorAes

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|8|

NOTES:

¢

The

circuit

shown

in

Be

on

the

conductor

indicates

printed

circuit

on

the

back

side

of

the

printed

circuit

board.

©

The

circuit

shown

in

|)

on

the

conductor

indicates

printed

circuit

on

the

front

side

of

the

circuit

board,

which

is

put

the

mechanism

unit.

©

Components

on

back

of

P.B

are

identified

by

black

symbols.

©

Components

on

front

of

P.B

are

identified

by

blue

symbols.

e

The

symbols

(@)

snown

in

the

circuit

board

indicate

connection

points

between

conductors

on

the

front

side

and

back

side

of

the

circuit

board.

©

Voltage

values

shown

in

[___]

are

measured

values

at

the

front

pattern

side

of

the

printed

circuit

board.

°

Values

indicates

in

[___]

are

DC

voltage

betwdeen

the

chassis

and

electrical

parts.

¢

All

voltage

values

shown

in

circuitry

are

under

nosignal

condition

and

playback

mode

with

volume

control

at

minimum

position.

For

measurement,

use

VTVM.

e(

)...

Voltage

value

at

IN

(dbx

switch)

mode.

¢

This

circuit

board

diagram

may

be

modified

at

any

time

with

the

development

of

new

technology.

|

MAIN

CIRCUIT

BOARD

(FPC)

/

EI

reO

NN

ll

&

3

8

YO

srasoes

On

ee

ar.

3

¢

4

An

4

re

ae

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rol

2resavA

(VS.0)

Vat.S

|

SI

V8.S

{I

V8.S

|

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vo

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(VE.I)

VO

[MM

V

28.0

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ed!

2evesanA

I

VE

S

é

VI

8

2

ea

tera

vel

BEK

ess

Black

BL

....5:

Blue

BRN......

Brown

GRY......

Gray

GRN

Green

oro

L.

BLU...Light

Blue

Srasoes

ee

No

Color

Mark

[vo

[a]

ORG

...Orange

PNK......Pink

RED......Red

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Wire

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EEL

8

1

6

5

4

3

2

1

MECHANICAL

PARTS

LOCATION

(Rear

View)

(Top

View)

Pressure

Roller

ew

76

Playback

Head

Arm

Assembly

A

Head

Base

Plate

Assembly

Clamper.

M33

M74

(MOTOR

WITH

MOTOR

GOVERNOR

B

CIRCUIT

BOARD)

Upper

Base

Plate

Assembly}

Lower

Base

Plate

Assembly

ere

|

E

M4:

Switch

Rod

Adjust

the

timing

M53:

Head

Base

:

Plate

Assembly

In

FF/REW

mode,

the

ON

timing

of

the

FF/REW

switch

(S3)

is

slightly

delayed

(compared

with

gear

engagement

timming)

to

prevent

generation

of

M73

Eject

Lever

Spring

mechanical

noise.

When

the

limiter

plate

(M47)

is

replaced,

adjust

the

timing

as

shown

in

the

figure.

M47:

Limitter

Plate

REPLACEMENT

PARTS

LIST

SPECIFICATIONS

T

i;

Ref

No.

Part

Name

&

Description

Ref

No.

Part

No.

Part

Name

&

Description

Ref

No.

Part

No.

l

Part

Name

&

Description

Ref

No.

Part

No.

Part

Name

&

Description

Ref No.

Part

No.

Part

Name

&

Description

;

+30

E

No.

|

Part Name

&

Deseristion

|

Pressure

of

pressure

roller

220%

408

MECHANICAL

PARTS

M

17

QBN1863

Switch

Rod

Spring

M

34

XTNQI6C4JFY

Tapping

Screw

@1.6x4

M

52

QTD1302

Wire

Clamper

M

69

QXRO0863

Fast

Forward

Rod

Assembly

M

18

QBN1864

Switch

Arm

Spring

M

35

XTSQI6A4JFC

Tapping

Screw

@1.6x4

M

53

QXK2546

Head

Base

Plate

Assembly

|M

70

QMA4333

Mechanism

Holding

Plate-C

Tak

tone)

M1

QMK1940

Chassis

Cover

M

19

QBN1865

Auto-Stop

Detection

Lever

M

36

XTNQ16C3J

—-

Tapping

Screw

@1.6x3

M54

QXF0185N

Flywheel

Assembly

M71

QMR1967

Changing

Rod

€up

tension

M2

QmR1962

Stop

Rod-2

Spring

M37

QHQ1293

Head

Adjustment

Screw

M55

QXK2547

Rod

Base

Plate

Assembly

|M72

QMF2233

Stopper

*

Use

cassette

torque

meter

35+10g-cm

M3

QXR0789

Eject

Rod

Assembly

M

20

QBN1866

Brake

Arm

Spring

M

38

QBW2030

Nylon

Washer

M

56

QXR0781

Control

Rod

Assembly

M

73

QBT1953

Eject

Lever

Spring

*+*

QZZSRKCT

M4

QMR1968

Switch

Rod

M

39

QBW2010

Poly

Washer

M

57

QXL1279N

Takeup

Gear

Lever

Assembly

|M

74

MHE3S3RB

Motor

Assembly

M5

QMR1970

Lock

Rod

M

21

QBN1867

Cue

Lever

Spring

M

40

QBW2012

Poly

Washer

M

58

QXL1508

Fast

Wind

Gear

Lever

(with

Motor

Governor

P.C.B)

i

6

M6

QML3836

Fast

Wind

Control

Rod

M22

QBN1876

Changing

Rod

Return

Spring

|M41

—

QXK2544

Lower

Base

Plate

Assembly

M75

QBG1676

Motor

Rubber

Wow

and

flutter:

JIS

Less

than

0.4%

M7

QBP1937

Cassette

Retainer

Spring

M

23

QBT1950

Control

Lever

Spring

M

59

Qmb0022

Auto-Stop

Cam

M

76

QHQ1302

Step

Screw

*

Use

test

tape

---

QZZCWAT

(RMS)

M8

QXA1198

Counter

Angle

Assembly

M

24

QBT1951

Rod

Spring

M

42

QDB0315

Flywheel

Belt

M

60

QXL1510

Lock

Release

Lever

Assembly

|

M

77

QXA1200

Motor

Holding

Plate

Assembly

M9

QXR0784

Playback

Rod

Assembly

M

25

QBT1952

Lock

Release

Lever

Spring

M

43

QMG0108

Tape

Guide

M

61

QXG1064

Main

Gear

Assembly

M

78

QXP0631

Pulley

M

10

QMA4381

Cassette

Holding

Angle

M

26

QBT1954

Playback

Rod

Spring

M

44

QBC1339

Head

Adjustment

Spring

M

79

QBW2102

Washer

M

27

QXL1511

Pressure

Roller

Arm

Assembly]

M

45

QBN1861

Playback

Spring

M

62

QxD0128

Takeup

Reel

Table

Assembly

|M

80

QMA4507

Switch

Angle

1M

11

QML3844

Switch

Arm

M

29

QTW1274

Insulating

Sheet

M

46

QBN1862

Pressure

Roller

Spring

M

63

QXD0134

Supply

Reel

Table

Assembly

|M

81

XQS16+3

Screw

@1.6x3

M

12

QML3451

Auto-Stop

Detection

Lever

M

30

XQN164+C3FY

Screw

@1.6x3

M

47

QZM0048

Limitter

Plate

M

64

QXR0861

Stop

Rod

Assembly

M

13

QXL1509

Brake

Arm

Assembly

M

31

XQN16+C5FY

Screw

@1.6x5

M

48

QBW2008

Poly

Washer

M

65

QMA4331

Mechanism

Holding

Plate-A

M

82

XTNQ16A3F

Tapping

Screw

@1.6x3

M

14

QGO1957W

Playback

Button

M

49

XSN24+4

Screw

@2x4

M

66

QMA4308

Switch

Angle

M

83

QHQ1333

Step

Screw

F

M

15

QBC1403

Flywheel

Spring

M

32

QHQ1320

Step

Screw

M

50

XQS16

+

A18FC

Screw

@1.6x

1.8

M

67

QXRO0862

Rewind

Rod

Assembly

M

84

QTD1258

Lug

Terminal

M

16

QBC1404

Back

Tension

Spring

M

33

XTNQ16C3F

Tapping

Screw

@1.6x3

M

51

XQN16

+

C1I8FY

Screw

@1.6x

1.8

M

68

QMA4332

Mechanism

Holding

Plate-B

|M

85

QBW2101

Poly

Washer

aes

Se

a

ee

—15—

a

16

=

aie

OX

nO

OX

MECHANICAL

PARTS

LOCATION

CABINET

PARTS

LOCATION

M57

—-

M62

G2

g

G8

D1

(LED)

E3

SPRING

LOCATION

M10

Cassette

Holding

Angle

M7

Cassette

Retainer

Spring

M25

Lock

Release

Lever

Spring

M41

Lower

Base

Plate

Assembly

o)

M20

Brake

Part

Name

&

Description

Arm

Spring

CABINET

PARTS

G5

XQN16+A3FZ

Screw

@1.6x3

M6

Fast

Wind

G6

XTN2+8JFZ

Tapping

Screw

@2x8

Control

Rod

G1

QYM0853K

Main

Case

Assembly

M23

Control

G

1-1

QBM1301

Cushion

G7

XQS16+A4FZ

Screw

@1.6x4

Mie

ute

StOR

Lever

Spring

G1-2

QJB0109

Battery

Terminal-A

G8

XQN16

+

A22FZ

Screw

@1.6x

2.2

:

G

1-3

QJB0142

Battery

Terminal-C

LM17

Switen

G

1-4

QJB0160

Battery

Terminal-B

ACCESSORIES

Maa

Head

lod

Spring

M24

Rod

Spring

G3-7

G15

QJBO0161

Rechargeable

Battery

Terminal

a

justment

Spring

woe

Ser

M4

Switch

Rodm

:

G16

XTN2+6B

Tapping

Screw

@2x6

Al

RP9529XP

Stereo

Headphones

Assembly

M18

Switch

M3

Eject

Rod

G2

QKM1553K

Bottom

Case

Assembly

A2

QFK0192

Carrying

Bag

IT

Arm

Spring

Assembly,

G3

QYF0572H

Cassette

Lid

Assembly

A3

Qzc0020

Shoulder

Belt

M24

Rod

Spring

G31

QXA1237

Cassette

Holder

A4

QQT3366

Instruction

Book

.

G3-2

QKC1091K

Hinge-A

PACKINGS

M53

Head

Base

=

G33

QKC1092K

Hinge-B

Plate

Assembly

r

G34

QMN8031

Cassette

Lid

Shaft

P41

QPN4368

Inside

Carton

M

M24

Rod

Spring

|

M26

Playback

|

G35

QBN7012K

Cassette

Lid

Spring

P2

QPA0649

Cushion

Playback:

Hod

Assembly

Rod

Spring}

G36

XQN16+A16FN

Screw

@1.6x

1.6

P3

QPS0604

Pad

X

Y

21

Cue

Lever

Sprin

Mg

Playback

Rod!

<3

|

G37

XQS16+A4FZ

Screw

@1.6x4

P4

QPC0083

Poly

Sheet

Me

ue

Leven

oping:

NGS

Hod

Base

Assembly

1

M24_

°F

°M73

Eject

|

G38

QkKJ0524

Collar

XZB14X25A02

Poly

Bag

(for

UNIT)

2S

sf

|

Rod

Spring

lever

|

a4

QKF4046K

Battery

Cover

SS

a

ARD

—17—

—

18—

Printed

in

Japan

H.M

Panasonic RQ-J20X User manual

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