JVC RC-636L User manual

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MODEL

RC-636L/LB

FM-SW-MW-LW

4-BAND

RADIO

STEREO

CASSETTE

RECORDER

No.

1372

July

1978

RC-636L/LB

Contents

Page

SpecihiCations:

cose

eb

Ft

OSs

seo

eee

ad

See

bale

Senso

e

Ae

rea

sees

aaa

2

Main: Parts

Mocation

sn.

see

ee

Siw

ele

era

aaa

bd

ia

Sa

ee

Re

es

I

Ds

eran

dod

Oe

eo

3

Disassembly

&

Replacement

...

0.0.0.0

ce

ee

ee

eee

eee

ee

eens

3

Tuner

Alignment

=:

2.

sinccs

sete

ce

gic

cde

secs

sete

Rid

Gna

Reet

s!

wo

HR

SSG

caval

wag

Dee

aie

EN

Tele

BS

eRe

ra

eae

sata

Se

45

Adjusting

Recording

Bias

.... 0...

0.

ee

ee

ee

eee

nee

nett

ees

8

Adjusting

Head

Azimuth...

as

6

s:scn

eae

ee

le

eee

Sad

Ce

ws

et

eek

e

Deo

the

wae

MA

Pen

8

How

to.

Fit:

Dial

Gord:

2.2

foe

akc

eteee

CE

oe

0

ee

Weare

re

eb

Rew

Selo

Baad

BER

ene

Wie

eneene

Conant

es

9

Adjustment

of

Cassette

Mechanism

.........0

00

eee

eee

ee

ee

ee

ee

eee

eee

ee

ees

10,11

Block:

Didgrart:..62si6

ice

eden

aie

iene

eS

hohe

BRA

ae

ea

Se

aie

al

aa ee Be ea

ewe

Bil

te

oea

oe

aaah

12

Wiring

Connections

6.o.6c3.6

occ

bee

ie

es

ee

a

id

oe

DE

OE

WR

a

ea

ee

Hew

Ee

13

Schematic

Diagram

of

RC-636L/LB

(Tuner)

.......

2-0-0

cece

ee

ee

ee

tee

eens

14

Schematic

Diagram

of

RC-636L/LB

(Amplifier)...

2.0...

eee

ee

eee

ees

15

Tuner

Circuit

Board

Ass’y

1.2...

0...

ee

ee

ee

ee

ee

eee

eee

eee

eee

ee

ees

16,17

Amplifier

Circuit

Board

Ass’y

..

0.0.0...

--

cece

ee

eee

ee

eee eee

eee

tee

eee

ees

18,19

Exploded

View

of

Cassette

Mechanism

.......-.

20

0c

eee

eee

eee

eee

ee

nee

tee

ete

20

List

of

Cassette

Mechanism

........

00.

cee

eee

ee

ee

ee

eee

eee

eee

eee

21

Control

Circuit

Board

Ass’y

..

2.2...

eee

ee

ee

ee

eee

ee

ee

eee

ee

eee

22

Power

Supply

Circuit

Board

Ass’y

(RC-636L)

........

0.

eee

ee

ee

ee

ee

eee

22

Exploded

View

of

Chassis

Ass’y

..........---

seh

dole

coord

sasaice

Wein:

apa

ate

an

coher

eyise

sheen

ine

padre

ae

a

aero

23,24,25

Exploded

View

of

Front

Cabinet...

2...

2.

ce

ec

ee

ee

ete

es

26,27

Exploded

View

of

Rear

Cabinet

(RC-636L)

..

0.2.2...

ce

eee

tet

28

Final

Packing

Ass’y

(RC-G36L)

2.0.0...

.

ec

ee

ee

eee

eee

eee

29

Accessories

(RC-636L)..

0...

ccc

ee

ee

ee ee

ere

ee

ete

eee

eee

eee

29

Difference

of

Model

RC-636LB

........

0.0...

eee

ee

eee

ees

29

Wiring

Connection

of

RC-63GLB

(Part)

2.2...

0c.

eee

ee

eee

teenies

29

Power

Supply

Circuit

Board

Ass’y

(RC-G36LB)

2.2...

ee

ees

30

Exploded

View

of

Rear

Cabinet

(RC-636LB)

...

20...

00

ccc

cece

ee

ee

ee

eee

eee

30

Final

Packing

Ass’y

(RC-636LB)

...

0.0.0.0...

cece

ee

eee

eee

eee

31

Accessories

(RC-G3GLB)

cies

sie

ae

ae

ieee

eek

ee

es

ER

we

ee

a

eee

ee

See

aetna

wae

aa

31

Specifications

DIMENSIONS:

26.4cm(H)

x

47.0cm(W)

x

12.3cm(D)

WEIGHT:

Approx.

6.0kg

(with

batteries)

10-3/8"

x

18-1/2”

x

4-7/8"

13.2

Ibs.

Frequency

Ranges

>:

FM

88~108MHz

AMPLIFIER

SECTION

SW

6~18MHz

Speakers

16cm(6-1/2’")

x

2,40

MW

540~1600kHz

Power

Output

Max.

9

(4.5

+

4.5)

W

(DC)

LW

150~350kHz

Input

Jacks

MIC

x

2

(0.8mV,

low

imp.)

Intermediate

Frequencies

:

FM

10.7MHz

Output

Jacks

Ext.

Speaker

x

2

(402)

SW/MW/LW

455kHz

Headphones

x

1

(822)

RECORDER

SECTION

Tape

Speed

Track

System

Recording

System

Erasing

System

S/N

Ratio

Fast

Forward

Time

Rewinding

Time

Wow

&

Flutter

No.

1372

Input/Output

Jack

>:

DIN

POWER

CONSUMPTION

:

15W

(at

RMS

power

output:

636L

seams

Haye)

14W

(at

10%

THD:

636LB)

4-track

2-channel

stereo

re

SEMICONDUCTORS

=

AC

Erasing

Transistors

:

19

More

than

45dB

at

1kHz

Biodas

:

18

Within

90

sec.

(C-60

cassette)

BoweR

SOURCE

Within

90

sec.

(C-60

cassette)

pe

:

12V.8

"R20"

or

“U2”

cells

or

0.14%

(WRMS)

equivalent

AC

110/220/240V,

50/60Hz

Fuse

1AT

ray

RC-636L/LB

Main

Parts

Location

5G)

VY

Fig.

1

Fig.

2

Parts

No.

Parts

Name

Description

VXQ4001-001

Knob

(Lever)

Rec

Mute,

Mode,

Function,

Tape

VXS4005-001

(Slide)

Volume

(L,R),

Tone

VXKM520-30011

Fine

Tuning

*VXL4021-002

Tuning

*VXQ3007-002

(Lever)

STOP/EJECT

*¥X03007-001

)

RECORD

*V¥XQ3007-003

REVIEW,

PLAY,

CUE,

PAUSE

*VJT3019-00A

Cassette

Door

*VJD3118-002

Head

Cover

*VYH1107-001

Chassis

2

Circuit

Board

Ass’y

Tuner

Control

Amplifier

COON

OORWNH

=

——_-

Cassette

Mechanism

Ass’y

*EAS16P127SC

Speaker

16cm(6-1/2"),

42

*VDM5043-002-004

Connector

&

Wire

Ass‘y

CN404S

for

Fine

Tuning

*VDM5043-003-001

CN401S

for

Tuner

*VDM5043-002-002

CN402S

for

Speakers

Note:

1,

Asterisked

parts

(*)

show

“NEW

PARTS”.

Other

parts

are

all

“CURRENT

PARTS”;

therefore,

check

your

inventory

and

order

situation

before

placing

new

order

to

avoid

making

extra

stock.

2.

The

circuit

board

assemblies

and

whole

assembly

of

cassette

mechanism

in

this

model

will

not

be

available

as

spare

parts.

3.

The

parts

marked

/\

are

the

important

parts

for

safety

assurance.

Use

the

specified

part,

when

replacing

the

safety

assurance

part,

never

use

an

equivalent

one.

Sa:

No.

1372

RC

636L/LB

Disassembly

&

Replacement

A.

Head

Cover

Draw

the

right

or

left

lower

ridge

of

the

head

cover

by

a

finger

tip.

Note:

The

head

azimuth

can

be

adjusted

by

removing

the

head

cover.

Fig.

5

Sn

aE

eases

nn

D.

Amplifier

&

Control

Circuit

Boards

1.

Take

off

the

tone

and

volume

control

knobs.

Fig.

3

2.

Disconnect

2

connectors

(B)

&

(E).

3.

Release

the

wires

by

straightening

the

wire

clamp

(D).

4.

Remove

7

screws

(11)~(17):

SBSB3014Z.

5.

N

B.

Rear

Cabinet

Pull

up

the

circuit

board

straightly

from

the

cabinet.

1.

Remove

7

screws

(1)~(3):

SDBP3012RS

and

(4)~(7):

ote:

1.

Engage

the

projection

of

function

switch

lever

V43899-1.

and

the

slider

(F)

in

place,

when

mounting

the

2.

Disconnect

3

connectors

from

rod

antenna

and

power

circuit

board

on

the

chassis.

supply

section.

2.

When

separating

the

control

circuit

board

from

the

amplifier

circuit

board,

remove

2

screws

on

the

control

circuit

board.

Fig.

4

Fig.

6

C.

Tuner

Circuit

Board

1.

Set

the

tuning

dial

to

the

minimum

frequency.

2.

Disconnect

2

connectors

from

the

fine

tuning

section

(A)

and

from

the

amplifier

circuit

board

(B).

3.

Remove

3

screws

(8)~(10):

SBSB3010Z.

4.

Draw

the

circuit

board

downward

with

slightly

lifting

its

lower

edge

upwards.

Note:

Fit

the

arm

of

variable

capacitor

and

the

dial

drum

when

mounting

the

circuit

board

on

the

chassis.

For

details

refer

to

page

9.

No.

1372

Avaes

RC-636L/LB

E.

LED

Circuit

Board

Press

2

projections

of

chassis

to

the

arrow

direction

as

shown

in

Fig.

7,

after

removing

the

tuner

circuit

board.

Fig.

7

.

Fig.

9

F.

Chassis

Assembly

1.

Take

off

the

tone,

volume,

fine

tuning

and

tuning

knobs.

:

2.

Disconnect

the

connector

(E).

H.

Power

Supply

Section

3.

Press

the

STOP/EJECT

button

to

disengaging

the

Remove

2

screws

(30)

&

(31):

SBSB4020C.

internal

cassette

door

opening

mechanism.

4.

Remove

7

screws

(18)~(22):

SBSB3014C

and

(23)

&

(24):

SBSB3025C.

Fig.

10

1.

Parts

of

Cassette

Mechanism

The

mechanism

of

RC-636

is

essentially

the

same

as

of

RC-525

or

RC-323.

Refer

to

the

service

manual

of

RC-525

or

RC-323.

Fig.

8

G.

Cassette

Mechanism

Assembly

1.

Take

the

chassis

assembly

out

of

the

cabinet

as

following

the

previous

item

F.

2.

Remove

5

screws

(25)~(29):

SBSB3010Z

and

the

screw

(15)

as

shown

in

Fig.

6.

_5_

No.

1372

RC-636L/LB

|

Tuner

Alignment

Output

Measuring:

Speaker

terminal

(Impedance

=42),

output

level

5|OmW

(0.45V/40}

AM

IF

&

RF

Alignment

Input

(SSG)

Modulation

400Hz,

Modulated

to

30%

Input

Signal

Place

to

be

Set

the

V.

Given

to

aligned

Capacitor

to

Repeat

the

Step

1,

and

adjust

for

no

further

improvement.

Loop

Antenna

—

105

Frequency

Band

Repeat

the

Steps

9

&

10.

600kHz

rere

600kHz

Signal

1400kHz

sci

paaieatey

TC6

1400kHz

Signal

Repeat

the

Steps

12

&

13,

and

adjust

for

no

further

improvement.

[email protected]

|

__Dummy

Antenne

TB

Repeat

the

Steps

15

&

16.

6.0MHz

Rod

Antenna

through

6.0MHz

Signal

18.0MHz

Dummy

Antenna

TC3

18.0MHz

Signal

Repeat

the

Steps

18

&

19,

and

adjust

for

no

further

improvement.

FM

IF

&

Discriminator

Alignment

1.

Connect

a

sweep

generator

to

the

test

point

TP4.

2.

Connect

a

oscilloscope

across

the

test

points

TP6

(Hot)

and

TP9.

3.

Align

the

T3

so

that

the

S-curve

will

become

symmetrical

and

the

noise

become

minimum.

Note:

1.

Align

after

mounting

the

tuner

circuit

board

in

the

cabinet

to

avoid

affection

of

leakage

flux

of

the

speaker.

2.

After

alignment,

demagnetize

the

coils

L10

and

T3

by

a

head

demagnetizer

to

decrease

possible

modulation

hum

due

to

leakage

flux

of

the

speaker.

FM

RF

Alignment

Input

(SSG):

Use

75Q

terminal,

modulation

400Hz

modulated

to

22.5kHz

deviation.

Connect

Hot

side

to

TP1

and

Cold

side

to

TP2.

Place

to

be

Set

the

V.

Frequency

aligned

Capacitor

to

109MH2

F

Frequency

M

Repeat

the

Steps

1

&

2.

SOF

nal

TP1

&

TP2

9OMHz

ious

106MHz

106MHz

Signal

Repeat

the

Steps

4

&

5,

and

adjust

for

no

further

improvement.

RC-636L/LB

FM

MPX

Alignment

Dummy

Antenna

A.

Regular

Method

1.

Connect

a

frequency

counter

to

the

test

point

TP8

through

50kQ.

2.

Ground

the

test

point

TP5.

o

3.

Adjust

the

variable

resistor

VR1

so

that

the

frequency

R

1

R

-,

GC

|

becomes

19kHz

+

100Hz.

1

|

B.

Simplified

Method

1.

Tune

to

a

FM

stereo

broadcast.

'

|

2.

Set

the

variable

resistor

VR1

to

a

center

position

of

the

—d

range

where

the

stereo

indicator

keeps

lighting.

™m

Mi

Bie

pa

ee

te

Beh

A

|

R1+R2=

8002

C

=

10pF

R1

:

Output

impedance

of

S.S.G.

Fig.

11

Parts

Arrangement

for

Alignment

=o

No.

1372

RC-636L/LB

Adjusting

Recording

Bias

Bias

Frequency

Bias

Current

1.

Connect

a

frequency

counter

across

TP201

(Hot)

and

1.

Connect

a

V.T.V.M.

across

TP201

—

TP202

and

TP301

TP202

(Cold).

—

TP302.

2.

Set

the

BEAT

CUT

switch

to

lower

position.

2.

Adjust

the

variable

resistor

VR203

(L)

and

VR303

(R)

3.

Adjust

the

oscillator

coil

L402

so

that

the

counter

indicates

68kHz.

so

that

the

voltage

becomes

4.5mV

(450uA/10Q).

Fig.

13

Adjusting

Head

Azimuth

.

Connect

a

V.T.V.M.

across

the

speaker

terminal.

.

Set

the

MODE

switch

to

MONO.

.

Playback

the

test

cassette

for

azimuth

adjustment.

.

Adjust

the

head

angle

for

maximum

output.

Note:

The

output

voltage

shows

three

peaks

while

adjusting

head

angle

as

illustrated

on

the

right,

adjust

for

maximum

peak.

5.

Check

that

the

output

difference

between

MONO

and

STEREO

is

within

3dB.

PWN

=

No.

1372

Output

—pe

Angie

Fig.

14

RC-636L/LB

How

to

Fit

Dial

Cord

1.

Dial

Cord

Material:

Tetoron

(braided

sheath)

and

Kevlar

(inside

filament),

coated

with

Teflon

Diameter

of

cord:

0.5mm

(20

mil)

Whole

length

of

cord:

1300mm

(51-3/16”)

2.

Remove

the

dial

scale

by

loosening

2

screws.

3.

Turn

the

dial

drum

fully

counterclockwise.

4,

Fit

the

cord

in

numerical

order

as

shown

in

Fig.

15.

5.

If

the

tuner

circuit

board

has

been

removed

from

the

chassis,

engage

the

projection

of

arm

which

is

mounted

on

the

shaft

of

variable

capacitor

with

the

slot

of

lever

which

is

positioned

opposite

side

of

dial

drum

as

shown

in

Fig.

16.

‘<

a

Fig.

15

Dial

Drum

Chassis

“TITTLE

cK

tH,

Lever

—,_

Arm

Circuit

Board

i

Variable

Capacitor

| |

Fig.

16

No.

1372

RC-636L/LB

Adjustment

of

Cassette

Mechanism

Play

Timing

1.

2.

No.

1372

In

the

playback

mode,

the

clearance

(A)

between

the

pinch

roller

arm

and

the

stopper

of

head

base

should

be

within

0.2

to

0.3

mm.

If

the

clearance

is

beyond

the

limits,

bend

the

part

(B)

of

pinch

roller

arm

to

adjust

the

clearance

as

shown

in

Fig.

17.

Pinch

Roller

Arm

Stopper

(Head

Base)

Fig.

17

Check

to

see

that

the

take-up

idler

turns

at

the

same

time

as

the

pinch

roller

or

the

take-up

idler

turns

first

and

then

the

pinch

roller

turns,

when

the

PLAY

button

is

pressed.

a.

If

the

pinch

roller

turns

very

later

than

the

take-up

idler,

bend

the

part

(C)

of

head

base

which

is

contacted

with

the

take-up

idler

by

the

part

(D)

to

the

(E)

direction

as

shown

in

Fig.

18.

b.

{f

the

take-up

idler

turns

later

than

the

pinch

roller,

bend

the

part

(C)

to

(F)

direction.

Head

base

Take-up

Idler

Fig.

18

Cue

&

Review

Mechanism

1.

Timing

of

Cue

Action

a.

In

the

playback

mode,

check

to

see

that

the

take-up

reel

disk

stops

turning

after

the

pinch

roller

has

stopped

turning

or

stops

at

the

same

time

and

then

the

mechanism

becomes

fast

forwarding

mode

when

the

CUE

button

has

been

pressed.

b.

If

the

timing

is

out

of

order,

adjust

it

as

following

the

item

2

of

“Play

Timing”.

2.

Timing

of

Review

Action

a.

In

the

playback

mode,

check

to

see

that

the

take-up

reel

disk

stops

turning

after

the

pinch

roller

has

stopped

or

stops

at

the

same

time

and

then

the

mechanism

becomes

rewinding

mode,

when

the

REVIEW

button

has

been

pressed.

b.

If

the

timing

is

out

of

order,

adjust

it

as

following

the

item

2

of

“Play

Timing”.

Pause

Timing

In

the

playback

mode,

check

that

the

PAUSE

button

is

locked

and

the

mechanism

temporarily

becomes

stop

mode

when

the

PAUSE

button

has

been

pressed,

and

that

the

button

is

released

and

the

mechanism

becomes

playback

mode

when

the

button

has

been

pressed

again.

If

the

mechanism

becomes

fast

forwarding

mode,

when

the

PAUSE

button

has

been

gradually

pressed,

bend

the

part

(G)

of

pinch

roller

arm

to

the

arrow

direction

to

adjust

that

the

take-up

reel

and

the

pinch

roller

stops

at

the

same

time

as

shown

in

Fig.

19.

Pause

Bar

Pinch

Roller

Arm

Fig.

19