Jvc Rc-250l User manual

MODEL

RC-250L/LB

FM-MW-LW

3-BAND

RADIO

CASSETTE

RECORDER

No.

1409

April

1980

RC-250L/LB

Contents

Page

Specifications:

..

5.22

oes

Secon

Pavel

en

Pe

ee

Ie

gs

lee

aal

Seer

ead

eal

bah

a

ON

el

ae

DRE

ee

2

Main:-Patts

Gocation:

<3

oe¢ecetecterstetien

gece

et

lenses

le

8s

ee

eee

STELE

whe

veh

wie

ee

Carte

Se

BGG

eg

a,

as

oh

el

aun

aed

Geet

a

ea

letiod

3

Disassembly.

&:

Replacement:

«s,s

<capane

acs.

or

po

dea

iec

nae

G1

S

Vie eae

g

Srl

Bae

a

woe

Se

4

Be

sie

SN,

Selene

hare

4

Juner

Alignment:

2.92240

Seed

oe

Oe

ee

Se

eae

AE

ted

otha

a

eens

Wk

ane

nae

FAO

5,6

Adjustment

of

Cassette

Mechanism

........

2...

0

ce

ee

eee

ee

6,7

Block:

Diagrams...

ccs

iets

oA

Eek

OSB

eB

ie

ee Se

a

ee

Ba

dad

dk

eae

Reece

ha

Ie

eae

8

Wiring:

COnMeCCtION

se:

c.6

200

eens

eed

Socata

ae

Ba

iene

we

ne

Sk

es

beg

eee

ig

WS

gig

daa

as

hs

ow

Gd

BI

gestae

AAS

4 A

9

Schematic

Diagram

of

RC-250L/LB

«1.1...

ee

eee

ee

10

Switch

Circuit

Board

Ass’y

..

0.02.

ee

eee

ee

eee

11

Main:Circuit:

Board!

Ass’

y*

cee

ch

bose

ee

arte

ecdnatie

eee

8

Sow

Sans

Pe

eer

ASE

anal

dete

ana

Bach

Sud

aa

a

12,

13

Exploded

View

of

Cassette

Mechanism

..

0...

0.0

ee

eee

eens

14

List-of

Cassette:

Mechanism.

...i.o055

6-ihe

a

eee

ee

ea

aR

Se

eee

EEE

DAY

EM

Se

ee

bem

ee

15

Exploded

View

of

Main

Circuit

Board

Ass’y

........0.

00.

cece

ee

ne

eee

ne

eee

16

Exploded

View

of

Rear

Cabinet

...

20...

2...

eee

ee

eee

eens

16

Exploded

View

of

Front

Cabinet

(1)

2.0.0...

eee

ee

eee eee nee

eens

17

Exploded

View

of

Front

Cabinet

(2)

2.0.0...

ccc

ee

ened

teen

eee

nen

neee

18,19

Final

Packing

Ass’y

(RC-250L)

..

2...

0.

ee

eet

eee

teen

en

yennes

20

Accessories:(RO:2500)

w36

o654

oy

aah

at

eset

bees

PA

oa

ate

Siete

base

Paden

Ste

ag

ale

ee

oe

20

Final

Packing

Ass’y

(RC-250LB)

....

2.0.0...

0c

cece

ee

eee

ee

eee

eee nnn

eennnees

21

Accessories

(RC-250LB)

2...

cc

ee

eee

nate

eee

nn

en

eee

eta

e

ener

enennnne

21

Specification

DIMENSIONS:

29.8

cm(W)

x

18

cm(H)

x

8.2

cm(D)

WEIGHT:

Approx.

2.2

kg/4.8

lbs

(with

batteries)

11-3/4""

(W)

x

7-1/8"

(H)

x

3-1/4”

(D)

1.9

kg/4.2

Ibs

(without

batteries)

TUNER

SECTION

AMPLIFIER

SECTION

:

Frequency

Ranges

>

FM

88

~

108

MHz

Speakers

>

9cem

(3%),

3.2

2

MW

540

~

1600

kHz

Power

Output

:

Max.

1.3

W

We

a0!

S00

Sz

POWER

SOURCE

Antennas

PEBIBOO

aneepia

DC

:6

V,4

R20-cells

or

equivalent

MW/LW;

Ferrite

core

antenna

AC

:

240/220/110

V,

50/60

Hz

RECORDER

Sel

POWER

CONSUMPTION

:

4

W

Tape

Speed

:

4.8

cm/s

(1-7/8

ips)

Track

System

:

2-track

monaural

Recording

System

:

DC

bias

Erasing

System

:

DC

erasing

Fast

Forward

Time

:

Within

110

sec

(C-60

cassette)

Rewind

Time

:

Within

110

sec

(C-60

cassette)

Wow

&

Flutter

:

0.15%

(WRMS)

No.

1499

RC-250L/LB

Main

Parts

Location

Fig.

2

Ref.

No.

fi

Parts

No.

ai

Parts

Name

ale

Description

O’ty

4

—

4

1

*VXL4100-001

Knob

TONE

1

2

*VXL4100-001

is

VOLUME

1

3

*VXL4098-00B

Knob

Ass'y

Tuning

1

4

*VJT3048-00A

Cassette

Door

Ass’y

1

ee

5

VQB012B-304

|

Bar

Antenna

Ass’y

|

L5,6

1

6

Circuit

Board

Ass’y

‘l

Cassette

Mechanism

Ass‘y

8

A\*VTP41N2-60C

Power

Transformer

for

RC-250L

1

or

VTP41N2-60CBS

ied

for

RC-250LB

1

9

/\*QSS2325-109

Slide

Switch

S5-1,-2

for

RC-250L

1

or

QSS2325-109BS

5

for

RC-250LB

1

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

eguivalant

one.

No.

1409

RC-250L/LB

Disassembly

&

Replacement

Rear

Cabinet

(Refer

to

Fig.

3.)

Cassette

Mechanism

Assembly

(Refer

to

Fig.

5.)

1.

Remove

4

screws

(1)

~(4):

SBSF30402Z.

1.

Remove

4

screws

(11)~

(14):

SBSF3010C.

2.

Disconnect

the

connecting

wire

from

the

rod

antenna

2.

By

pressing

the

STOP/EJECT

button

open

the

cassette

terminal

(white).

door

to

disengage

the

mechanism.

Fig.

3

(13)

(14)

Circuit

Board

(Refer

to

Fig.

4.)

1.

Take

off

the

TONE

and

VOLUME

knobs.

2.

Remove

5

screws

(5):

VKZ4131-002

and

(6)

~

(9):

SBSF-

3010C,

3.

Loosen

the

screw

(10):

SBSF30102.

Fig.

4

No.

1409

'

RC-250L/LB

Tuner

Alignment

Output

Measuring:

Speaker

terminal

(Impedance

=

3.202),

output

level

50

mW

(0.4

V/3.2

92)

AM

IF

&

RF

Alignment

Input

(SSG):

Modulation

400

Hz,

Modulated

to

30%

r

Input

Signal

|

Step

ore

Place

to

be

aligned

Set

the

V.

Capacitor

to

an

Frequency

455 kHz

Repeat

the

Step

1,

and

adjust

for

no

further

improvement.

=

|

145

kHz

L8

Maximum

r

Loop

Antenna

360

kHz

TC5

|

Minimum

Repeat

the

Steps

3

&

4.

LW

160

kHz

|

350

kHz

Repeat

the

Steps

6

&

7,

and

adjust

for

no

further

improvement.

520kHz

|

L7

Maximum

Loop

Antenna

LL

1650

kHz

TC6

hire

Minimum

Given

to

Loop

Antenna

T2,4,7

Minimum

MW

(IF)

r

L5

160

kHz

Signal

Loop

Antenna

|

TC4

350

kHz

Signal

Fle

E

lL

11

sa

Repeat

the

Steps

9

&

10.

12

600

kHz

L6

600

kHz

Signal

t————

Loop

Antenna

13

1400

kHz

TC3

1400

kHz

Signal

14

Repeat

the

Steps

12

&

13,

and

adjust

for

no

further

improvement.

FM

IF

&

Discriminator

Alignment

1.

Connect

the

sweep

generator

to

the

test

point

TP-2

(Refer

to

Fig.

7).

2.

Connect

the

oscilloscope

to

the

test

point

TP-5

(Hot)

&

TP-7

(Earth)

(Refer

to

Fig.

7).

3.

Align

the

T6

so

that

the

wave

mode

will

be

appeared

on

either

side

of

the

flyback

tine

(Refer

to

Figs.

6-A

&

B).

4.

Align

the

T1,

3

&

5

so

that

the

maximum

sensitivity

and

symmetrical

wave

mode

will

be

obtained

setting

the

marker

10.7

MHz

on

the

peak

(Refer

to

Fig.

6-B).

5.

Align

the

TS

&

6

so

that

the

symmetrical

‘’S’’

curve

will

be

obtained

setting

the

marker

10.7

MHz

on

the

center

of

the

“S"

curve

(Refer

to

Fig.

6-C).

Fig.

6-A

Fig.

6-B

Fig.

6-C

No.

1409

RC-250L/LB

FM

RF

Alignment

Input

(SSG):

Use

75

9

terminal,

modulation

400

Hz,

modulated

to

22.5

kHz

deviation.

ae

Input

Signal

Step

Frequency

Place

to

be

aligned

Set

the

V.

Capacitor

to

Band

Frequency

Given

to

—

=

|

1

87.5

MHz

Rod

Antenna

LL

L3

_

Maximum

2

109

MHz

Terminal

TC-2

Minimum

p=

|

a

_

3

au

Repeat

the

Steps

1

&

2.

4

90

MHz

Ie

een

eine

1

[

90

MHz

Signal

5

106

MHz

Terminal

TC-1

106

MHz

Signal

6

Repeat

the

Steps

4

&

5,

and

adjust

for

no

further

improvement.

Parts

Arrangement

for

Alignment

TP

uty

be

creas

[7

a

TP2@-|1c2__

On

tea_}

=

C2

|

Tl

3

TC5

TC6

T3ypgIP5

|

1P7

$

TS

t7L]LIT6

Fig.

7

Adjustment

of

Cassette

Mechanism

Playback

Torque

1.

The

playback

torque should

be

within

45

to

70

g-cm.

2.

If

the

torque

is

less

than

45

g-cm,

set

the

two-flat

clutch

spring

plate

of

the

take-up

reel

disk

to

the

4

position.

If

the

torque

exceeds

70

g-cm,

set

the

spring

plate

to

the

2

position.

Note:

Before

adjusting

the

torque

wipe

off

the

surface

of

rubber

parts

and

rotating

parts,

if

the

torque

is

not

sufficient.

No.

1409

Fast

Forward

&

Rewind

Torque

1.

Fast

Forward

Torque

In

the

fast

forward

mode,

check

that

the

F.F.

torque

is

within

60

to

130

g-cm

by

applying

the

torque

gauge

to

the

take-up

reel.

2.

Rewind

Torque

In

the

rewind

mode,

check

that

the

rewind

torque

is

within

60

to

130

g-cm

by

applying

the

torque

gauge

to

the

supply

reel.

Thrust

of

Flywheel

The

clearance

between

the

top

of

flywheel

spindle

and

the

flywheel

bracket

should

be

within

0.1

to

0.3

mm.

If

the

clearance

is

out

of

limits,

adjust

the

adjusting

screw

for

normal

value.

Note:

After

adjustment,

fix

the

screw

with

lock

adhesive.

Adjusting

Screw

0.1

~0.3

mm

Fig.

9

Location

of

Heads

The

play/record

and

erase

heads

should

be

positioned

as

shown

below

in

the

playback

mode.

Rec/Play

Head

Erase

Head

Guide

Fig.

10

RC-250L/LB

Pressure

of

Pinch

Roller

1.

Setting

the

mechanism

vertically

in

the

playback

mode,

the

pinch

roller

should

stop

turning

at

the

pressure

of

380~450

g

when

the

pinch

rcller

arm

has

been

pulled

upwards

by

tension

gauge

as

shown

in

Fig.

11.

2.

If

the

pressure

is

out

of

limit,

change

the

pinch

roller

spring.

Note:

If

the

pressure

is

excessively

high,

it

may

cause

the

noise

from

the

pinch

roller

bearing

and

defec-

tive

in

wow

and

flutter.

If

the

pressure

is

defective-

ly

low,

it

may

cause

defective

in

auto

stop

motion

and

in

wow

and

flutter.

Tension

Gauge

Pinch

Roller

Arm

Capstan

Pinch

Roller

Fig.

11

TAPE

SPEED

1.

The

tape

speed

should

be

within

2940

Hz

(—2%)

to

3090

Hz

(+3%)

by

reference

tape.

2.

If

the

speed

is

out

of

limit,

adjust

it

by

inserting

the

small

screw-driver

into

the

adjusting

hole

of

motor.

a.

If

the

speed

is

less

than

--2%

turn

the

driver

clock-

wise.

b.

If

the

speed

is

over

+3%,

turn

the

driver

counter-

clockwise.

©)

O

Adjusting

Hole

Fig.

12

No.

1409

RC-250L/LB

Block

Diagram

Playback

&

Radio

Reception

Mode

X1

2501342

X2

281342

FM

RF

CONVERTER

X3

2SC460

FM

IF/AM

CONVERTER/

EQUALIZER

DETECTOR

X6

2SC458

EQUALIZER

POWER

AMP

Fig.

13

Recording

Mode

X1-2SC1342

X2.

28C1342

X4

=

28C460

X5

2S5C460

FM

RF

FM/AM

IF

FM/AM

IF

V

CONVERTER

DESCRIMINA-

TOR

D6

pag

INS4A

DETECTOR

6

re

wo

F?

2

X3

2SC460

FM

IF/AM

CONVERTER

/

PRE

AMP

25C458

X6

PRE

AMP

1C-1

BA527

POWER

RECORDING

X7

2SC458

ALC

Fig.

14

No.

1409

RC-250L/LB

Wiring

Connection

ROD

ANT.

MECHA.

ASS'Y

R/P

HEAD

LEAF

SW.

No.

1409

RC-250L/LB

Schematic

Diagram

of

RC-250L/LB

rT”

OY Oe

———

ar

———

are

ezED>

=D

eS

Sa

se

al

ne

ce

a

A

CT

|

=e

eee

Siesta

=m

ER

=

ON

ae

=a

|

cecum

anal

ral

—_——_

ee

el

X1

25C1342(B)

FM

CONY]

x2

2S¢1342(8)

yA

0460(C)

DEANE

7e

C4600)

R20

220K

‘|

|

TP]

FM

RF.

C8),

8P

C9

,,5P

Pe

7

|

TA

1

FM

(ay)

5.0%)

eg

|

DI

HV80

i

C40

0.022u

C29

0.06

C10

1000P

L5_

DISHYB0

TC3

wt

—{—

—

IG

ri

MW)

if

Ri2

1000.

R13

330:

LAAA-]

10E1x4

D1)

or

WO3Bx4

C83

0.022u

D9

mene

rc

ere

C82

0.022u

C8l

0.022u

Se

dd

E

D12

C84

0.022u

C85

4700P

C0265-006

ees

KR

X3

2S5C460(C)

M

IE

AM

CONV

PRE

AMP]

VMME62N

i

O

C49

0.022y

PLAYBACK

C50

33p

10V

Lanna

cS

x=

£3.

RECORD

ee

-015

R54

150N

OO

Om

O

S

C65

220P

L9

MMI6FEMK

O

T41572-001

2@

1»

R36

22K

R55_33K

470y

10V

vono2n-002

|

2

Ss

PT

g

5

eo

ie

SPKR

ple

ee

ale

:

a(|

8

X6

25C458(D)

PRE

AMP

C55

220P

EAS9P71S

C72

,,

3900P

X7

Ré1_z700

25c458(0)

ALC]

0a‘

rave0

——

CTR?

15K

_|

NOTES

1{SW.

NO|PARTS

NO.

FUNCTION

POSITION

2

VOLTAGES

ARE

MEASURED

WITH

NO

SIGNAL

USING

Biss

S2

V.TV.M

AT

FM-PLAY.

(

)VALUES

AT

MW-RECORD.

Mw

ol

«PLAYBACK

3

SYMBOL

MARKS

CIRCLED

OF

RESISTORS

ARE

’

PRINTED

CARBON

RESISTORS.

§

ao

-

RECORD

LWo

Play

Rec

TAPE

0

¥

Shaded

parts

show

safety

assurance

parts.

Fig.

16

No.

1409

A40=

JVC RC-250L User manual

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