JVC RC-636L Bedienungsanleitung

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

OSs

seo

eee

See

bale

Senso

rea

sees

aaa

Main: Parts

Mocation

sn.

see

Siw

ele

era

aaa

eran

dod

Disassembly

Replacement

...

0.0.0.0

eee

eens

Tuner

Alignment

sinccs

sete

gic

cde

secs

sete

Rid

Gna

Reet

SSG

caval

wag

Dee

aie

Tele

eRe

eae

sata

Adjusting

Recording

Bias

.... 0...

eee

nee

nett

ees

Adjusting

Head

Azimuth...

s:scn

eae

eee

Sad

eek

Deo

the

wae

Pen

How

to.

Fit:

Dial

Gord:

2.2

foe

akc

eteee

Weare

Rew

Selo

Baad

BER

ene

Wie

eneene

Conant

Adjustment

Cassette

Mechanism

.........0

eee

ees

10,11

Block:

Didgrart:..62si6

ice

eden

aie

iene

hohe

BRA

aie

aa ee Be ea

ewe

Bil

oea

aaah

Wiring

Connections

6.o.6c3.6

occ

bee

Hew

Schematic

Diagram

RC-636L/LB

(Tuner)

.......

2-0-0

cece

tee

eens

Schematic

Diagram

RC-636L/LB

(Amplifier)...

2.0...

eee

ees

Tuner

Circuit

Board

Ass’y

1.2...

0...

eee

ees

16,17

Amplifier

Circuit

Board

Ass’y

0.0.0...

cece

eee

eee eee

eee

tee

eee

ees

18,19

Exploded

View

Cassette

Mechanism

.......-.

eee

nee

tee

ete

List

Cassette

Mechanism

........

00.

cee

eee

Control

Circuit

Board

Ass’y

2.2...

eee

Power

Supply

Circuit

Board

Ass’y

(RC-636L)

........

eee

Exploded

View

Chassis

Ass’y

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

seh

dole

coord

sasaice

Wein:

apa

ate

coher

eyise

sheen

ine

padre

aero

23,24,25

Exploded

View

Front

Cabinet...

2...

ete

26,27

Exploded

View

Rear

Cabinet

(RC-636L)

0.2.2...

eee

tet

Final

Packing

Ass’y

(RC-G36L)

2.0.0...

eee

Accessories

(RC-636L)..

0...

ccc

ee ee

ere

ete

eee

Difference

Model

RC-636LB

........

0.0...

eee

ees

Wiring

Connection

RC-63GLB

(Part)

2.2...

0c.

eee

teenies

Power

Supply

Circuit

Board

Ass’y

(RC-G36LB)

2.2...

ees

Exploded

View

Rear

Cabinet

(RC-636LB)

...

20...

ccc

cece

eee

Final

Packing

Ass’y

(RC-636LB)

...

0.0.0.0...

cece

eee

Accessories

(RC-G3GLB)

cies

sie

ieee

eek

eee

See

aetna

wae

Specifications

DIMENSIONS:

26.4cm(H)

47.0cm(W)

12.3cm(D)

WEIGHT:

Approx.

6.0kg

(with

batteries)

10-3/8"

18-1/2”

4-7/8"

13.2

Ibs.

Frequency

Ranges

88~108MHz

AMPLIFIER

SECTION

6~18MHz

Speakers

16cm(6-1/2’")

2,40

540~1600kHz

Power

Output

Max.

(4.5

4.5)

(DC)

150~350kHz

Input

Jacks

MIC

(0.8mV,

low

imp.)

Intermediate

Frequencies

10.7MHz

Output

Jacks

Ext.

Speaker

(402)

SW/MW/LW

455kHz

Headphones

(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

SEMICONDUCTORS

Erasing

Transistors

than

45dB

1kHz

Biodas

Within

sec.

(C-60

cassette)

BoweR

SOURCE

Within

sec.

(C-60

cassette)

12V.8

"R20"

“U2”

cells

0.14%

(WRMS)

equivalent

110/220/240V,

50/60Hz

Fuse

1AT

ray

RC-636L/LB

Main

Parts

Location

5G)

Fig.

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

Circuit

Board

Ass’y

Tuner

Control

Amplifier

COON

OORWNH

——_-

Cassette

Mechanism

Ass’y

*EAS16P127SC

Speaker

16cm(6-1/2"),

*VDM5043-002-004

Connector

Wire

Ass‘y

CN404S

for

Fine

Tuning

*VDM5043-003-001

CN401S

for

Tuner

*VDM5043-002-002

CN402S

for

Speakers

Note:

Asterisked

parts

(*)

show

“NEW

PARTS”.

Other

parts

are

all

“CURRENT

PARTS”;

therefore,

check

your

inventory

and

order

situation

before

placing

new

order

avoid

making

extra

stock.

The

circuit

board

assemblies

and

whole

assembly

cassette

mechanism

this

model

will

not

available

spare

parts.

The

parts

marked

are

the

important

parts

for

safety

assurance.

Use

the

specified

part,

when

replacing

the

safety

assurance

part,

never

use

equivalent

one.

Sa:

No.

1372

636L/LB

Disassembly

Replacement

Head

Cover

Draw

the

right

left

lower

ridge

the

head

cover

finger

tip.

Note:

The

head

azimuth

can

adjusted

removing

the

head

cover.

Fig.

eases

Amplifier

Control

Circuit

Boards

Take

off

the

tone

and

volume

control

knobs.

Fig.

Disconnect

connectors

(B)

(E).

Release

the

wires

straightening

the

wire

clamp

(D).

Remove

screws

(11)~(17):

SBSB3014Z.

Rear

Cabinet

Pull

the

circuit

board

straightly

from

the

cabinet.

Remove

screws

(1)~(3):

SDBP3012RS

and

(4)~(7):

ote:

Engage

the

projection

function

switch

lever

V43899-1.

and

the

slider

(F)

place,

when

mounting

the

Disconnect

connectors

from

rod

antenna

and

power

circuit

board

the

chassis.

supply

section.

When

separating

the

control

circuit

board

from

the

amplifier

circuit

board,

remove

screws

the

control

circuit

board.

Fig.

Tuner

Circuit

Board

Set

the

tuning

dial

the

minimum

frequency.

Disconnect

connectors

from

the

fine

tuning

section

(A)

and

from

the

amplifier

circuit

board

(B).

Remove

screws

(8)~(10):

SBSB3010Z.

Draw

the

circuit

board

downward

with

slightly

lifting

its

lower

edge

upwards.

Note:

Fit

the

arm

variable

capacitor

and

the

dial

drum

when

mounting

the

circuit

board

the

chassis.

For

details

refer

page

No.

1372

Avaes

RC-636L/LB

LED

Circuit

Board

Press

projections

chassis

the

arrow

direction

shown

Fig.

after

removing

the

tuner

circuit

board.

Fig.

Chassis

Assembly

Take

off

the

tone,

volume,

fine

tuning

and

tuning

knobs.

Disconnect

the

connector

(E).

Power

Supply

Section

Press

the

STOP/EJECT

button

disengaging

the

Remove

screws

(30)

(31):

SBSB4020C.

internal

cassette

door

opening

mechanism.

Remove

screws

(18)~(22):

SBSB3014C

and

(23)

(24):

SBSB3025C.

Fig.

Parts

Cassette

Mechanism

The

mechanism

RC-636

essentially

the

same

RC-525

RC-323.

Refer

the

service

manual

RC-525

RC-323.

Fig.

Cassette

Mechanism

Assembly

Take

the

chassis

assembly

out

the

cabinet

following

the

item

Remove

screws

(25)~(29):

SBSB3010Z

and

the

screw

(15)

shown

Fig.

_5_

No.

1372

RC-636L/LB

Tuner

Alignment

Output

Measuring:

Speaker

terminal

(Impedance

=42),

output

level

5|OmW

(0.45V/40}

Alignment

Input

(SSG)

Modulation

400Hz,

Modulated

30%

Input

Signal

Place

Set

the

Given

aligned

Capacitor

Repeat

the

Step

and

adjust

for

further

improvement.

Loop

Antenna

—

105

Frequency

Band

Repeat

the

Steps

10.

600kHz

rere

600kHz

Signal

1400kHz

sci

paaieatey

TC6

1400kHz

Signal

Repeat

the

Steps

13,

and

adjust

for

further

improvement.

[email protected]

__Dummy

Antenne

Repeat

the

Steps

16.

6.0MHz

Rod

Antenna

through

6.0MHz

Signal

18.0MHz

Dummy

Antenna

TC3

18.0MHz

Signal

Repeat

the

Steps

19,

and

adjust

for

further

improvement.

Discriminator

Alignment

Connect

sweep

generator

the

test

point

TP4.

Connect

oscilloscope

across

the

test

points

TP6

(Hot)

and

TP9.

Align

the

that

the

S-curve

will

become

symmetrical

and

the

noise

become

minimum.

Note:

Align

after

mounting

the

tuner

circuit

board

the

cabinet

avoid

affection

leakage

flux

the

speaker.

After

alignment,

demagnetize

the

coils

L10

and

head

demagnetizer

decrease

possible

modulation

hum

due

leakage

flux

the

speaker.

Alignment

Input

(SSG):

Use

75Q

terminal,

modulation

400Hz

modulated

22.5kHz

deviation.

Connect

Hot

side

TP1

and

Cold

side

TP2.

Place

Set

the

Frequency

aligned

Capacitor

109MH2

Frequency

Repeat

the

Steps

SOF

nal

TP1

TP2

9OMHz

ious

106MHz

Signal

Repeat

the

Steps

and

adjust

for

further

improvement.

RC-636L/LB

MPX

Alignment

Dummy

Antenna

Regular

Method

Connect

frequency

counter

the

test

point

TP8

through

50kQ.

Ground

the

test

point

TP5.

Adjust

the

variable

resistor

VR1

that

the

frequency

becomes

19kHz

100Hz.

Simplified

Method

Tune

stereo

broadcast.

Set

the

variable

resistor

VR1

center

position

the

—d

range

where

the

stereo

indicator

keeps

lighting.

™m

Bie

Beh

R1+R2=

8002

10pF

Output

impedance

S.S.G.

Fig.

Parts

Arrangement

for

Alignment

No.

1372

RC-636L/LB

Adjusting

Recording

Bias

Frequency

Bias

Current

Connect

frequency

counter

across

TP201

(Hot)

and

Connect

V.T.V.M.

across

TP201

—

TP202

and

TP301

TP202

(Cold).

—

TP302.

Set

the

BEAT

CUT

switch

lower

position.

Adjust

the

variable

resistor

VR203

(L)

and

VR303

(R)

Adjust

the

oscillator

coil

L402

that

the

counter

indicates

68kHz.

that

the

voltage

becomes

4.5mV

(450uA/10Q).

Fig.

Adjusting

Head

Azimuth

Connect

V.T.V.M.

across

the

speaker

terminal.

Set

the

MODE

switch

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

illustrated

the

right,

adjust

for

maximum

peak.

Check

that

the

output

difference

between

MONO

and

STEREO

within

3dB.

PWN

No.

1372

Output

—pe

Angie

Fig.

RC-636L/LB

How

Fit

Dial

Cord

Dial

Cord

Material:

Tetoron

(braided

sheath)

and

Kevlar

(inside

filament),

coated

with

Teflon

Diameter

cord:

0.5mm

(20

mil)

Whole

length

cord:

1300mm

(51-3/16”)

Remove

the

dial

scale

loosening

screws.

Turn

the

dial

drum

fully

counterclockwise.

Fit

the

cord

numerical

order

shown

Fig.

15.

the

tuner

circuit

board

has

been

removed

from

the

chassis,

engage

the

projection

arm

which

mounted

the

shaft

variable

capacitor

with

the

slot

lever

which

positioned

opposite

side

dial

drum

shown

Fig.

16.

‘<

Fig.

Dial

Drum

Chassis

“TITTLE

tH,

Lever

—,_

Arm

Circuit

Board

Variable

Capacitor

| |

Fig.

No.

1372

RC-636L/LB

Adjustment

Cassette

Mechanism

Play

Timing

No.

1372

the

playback

mode,

the

clearance

(A)

between

the

pinch

roller

arm

and

the

stopper

head

base

should

within

0.2

0.3

mm.

the

clearance

beyond

the

limits,

bend

the

part

(B)

pinch

roller

arm

adjust

the

clearance

shown

Fig.

17.

Pinch

Roller

Arm

Stopper

(Head

Base)

Fig.

Check

see

that

the

take-up

idler

turns

the

same

time

the

pinch

roller

the

take-up

idler

turns

first

and

then

the

pinch

roller

turns,

when

the

PLAY

button

pressed.

the

pinch

roller

turns

very

later

than

the

take-up

idler,

bend

the

part

(C)

head

base

which

contacted

with

the

take-up

idler

the

part

(D)

the

(E)

direction

shown

Fig.

18.

the

take-up

idler

turns

later

than

the

pinch

roller,

bend

the

part

(C)

(F)

direction.

Head

base

Take-up

Idler

Fig.

Cue

Review

Mechanism

Timing

Cue

Action

the

playback

mode,

check

see

that

the

take-up

reel

disk

stops

turning

after

the

pinch

roller

has

stopped

turning

stops

the

same

time

and

then

the

mechanism

becomes

fast

forwarding

mode

when

the

CUE

button

has

been

pressed.

the

timing

out

order,

adjust

following

the

item

“Play

Timing”.

Timing

Review

Action

the

playback

mode,

check

see

that

the

take-up

reel

disk

stops

turning

after

the

pinch

roller

has

stopped

stops

the

same

time

and

then

the

mechanism

becomes

rewinding

mode,

when

the

REVIEW

button

has

been

pressed.

the

timing

out

order,

adjust

following

the

item

“Play

Timing”.

Pause

Timing

the

playback

mode,

check

that

the

PAUSE

button

locked

and

the

mechanism

temporarily

becomes

stop

mode

when

the

PAUSE

button

has

been

pressed,

and

that

the

button

released

and

the

mechanism

becomes

playback

mode

when

the

button

has

been

pressed

again.

the

mechanism

becomes

fast

forwarding

mode,

when

the

PAUSE

button

has

been

gradually

pressed,

bend

the

part

(G)

pinch

roller

arm

the

arrow

direction

adjust

that

the

take-up

reel

and

the

pinch

roller

stops

the

same

time

shown

Fig.

19.

Pause

Bar

Pinch

Roller

Arm

Fig.

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