JVC RC-250L Bedienungsanleitung

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

lee

aal

Seer

ead

eal

bah

DRE

Main:-Patts

Gocation:

oe¢ecetecterstetien

gece

lenses

eee

STELE

whe

veh

wie

Carte

BGG

aun

aed

Geet

letiod

Disassembly.

Replacement:

«s,s

<capane

acs.

dea

iec

nae

Vie eae

Srl

Bae

woe

sie

SN,

Selene

hare

Juner

Alignment:

2.92240

Seed

eae

ted

otha

eens

ane

nae

FAO

5,6

Adjustment

Cassette

Mechanism

........

2...

eee

6,7

Block:

Diagrams...

ccs

iets

Eek

OSB

ee Se

dad

eae

Reece

eae

Wiring:

COnMeCCtION

se:

c.6

200

eens

eed

Socata

iene

beg

eee

gig

daa

gestae

AAS

4 A

Schematic

Diagram

RC-250L/LB

«1.1...

eee

Switch

Circuit

Board

Ass’y

0.02.

eee

Main:Circuit:

Board!

Ass’

cee

bose

arte

ecdnatie

eee

Sow

Sans

eer

ASE

anal

dete

ana

Bach

Sud

12,

Exploded

View

Cassette

Mechanism

0...

0.0

eee

eens

List-of

Cassette:

Mechanism.

...i.o055

6-ihe

eee

EEE

DAY

bem

Exploded

View

Main

Circuit

Board

Ass’y

........0.

00.

cece

eee

Exploded

View

Rear

Cabinet

...

20...

2...

eee

eens

Exploded

View

Front

Cabinet

(1)

2.0.0...

eee

eee eee nee

eens

Exploded

View

Front

Cabinet

(2)

2.0.0...

ccc

ened

teen

eee

nen

neee

18,19

Final

Packing

Ass’y

(RC-250L)

2...

eet

eee

teen

yennes

Accessories:(RO:2500)

w36

o654

aah

eset

bees

ate

Siete

base

Paden

Ste

ale

Final

Packing

Ass’y

(RC-250LB)

....

2.0.0...

cece

eee

eee nnn

eennnees

Accessories

(RC-250LB)

2...

eee

nate

eee

eta

ener

enennnne

Specification

DIMENSIONS:

29.8

cm(W)

cm(H)

8.2

cm(D)

WEIGHT:

Approx.

2.2

kg/4.8

lbs

(with

batteries)

11-3/4""

(W)

7-1/8"

(H)

3-1/4”

(D)

1.9

kg/4.2

Ibs

(without

batteries)

TUNER

SECTION

AMPLIFIER

SECTION

Frequency

Ranges

108

MHz

Speakers

9cem

(3%),

3.2

540

1600

kHz

Power

Output

Max.

1.3

a0!

S00

POWER

SOURCE

Antennas

PEBIBOO

aneepia

V,4

R20-cells

equivalent

MW/LW;

Ferrite

core

antenna

240/220/110

50/60

RECORDER

Sel

POWER

CONSUMPTION

Tape

Speed

4.8

cm/s

(1-7/8

ips)

Track

System

2-track

monaural

Recording

System

bias

Erasing

System

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.

Ref.

No.

Parts

No.

Parts

Name

ale

Description

O’ty

—

*VXL4100-001

Knob

TONE

*VXL4100-001

VOLUME

*VXL4098-00B

Knob

Ass'y

Tuning

*VJT3048-00A

Cassette

Door

Ass’y

VQB012B-304

Bar

Antenna

Ass’y

L5,6

Circuit

Board

Ass’y

‘l

Cassette

Mechanism

Ass‘y

A\*VTP41N2-60C

Power

Transformer

for

RC-250L

VTP41N2-60CBS

ied

for

RC-250LB

/\*QSS2325-109

Slide

Switch

S5-1,-2

for

RC-250L

QSS2325-109BS

for

RC-250LB

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

eguivalant

one.

No.

1409

RC-250L/LB

Disassembly

Replacement

Rear

Cabinet

(Refer

Fig.

3.)

Cassette

Mechanism

Assembly

(Refer

Fig.

5.)

Remove

screws

(1)

~(4):

SBSF30402Z.

Remove

screws

(11)~

(14):

SBSF3010C.

Disconnect

the

connecting

wire

from

the

rod

antenna

pressing

the

STOP/EJECT

button

open

the

cassette

terminal

(white).

door

disengage

the

mechanism.

Fig.

(13)

(14)

Circuit

Board

(Refer

Fig.

4.)

Take

off

the

TONE

and

VOLUME

knobs.

Remove

screws

(5):

VKZ4131-002

and

(6)

(9):

SBSF-

3010C,

Loosen

the

screw

(10):

SBSF30102.

Fig.

No.

1409

RC-250L/LB

Tuner

Alignment

Output

Measuring:

Speaker

terminal

(Impedance

3.202),

output

level

(0.4

V/3.2

92)

Alignment

Input

(SSG):

Modulation

400

Hz,

Modulated

30%

Input

Signal

Step

ore

Place

aligned

Set

the

Capacitor

Frequency

455 kHz

Repeat

the

Step

and

adjust

for

further

improvement.

145

kHz

Maximum

Loop

Antenna

360

kHz

TC5

Minimum

Repeat

the

Steps

160

kHz

350

kHz

Repeat

the

Steps

and

adjust

for

further

improvement.

520kHz

Maximum

Loop

Antenna

1650

kHz

TC6

hire

Minimum

Given

Loop

Antenna

T2,4,7

Minimum

(IF)

160

kHz

Signal

Loop

Antenna

TC4

350

kHz

Signal

Fle

Repeat

the

Steps

10.

600

kHz

600

kHz

Signal

t————

Loop

Antenna

1400

kHz

TC3

1400

kHz

Signal

Repeat

the

Steps

13,

and

adjust

for

further

improvement.

Discriminator

Alignment

Connect

the

sweep

generator

the

test

point

TP-2

(Refer

Fig.

7).

Connect

the

oscilloscope

the

test

point

TP-5

(Hot)

TP-7

(Earth)

(Refer

Fig.

7).

Align

the

that

the

wave

mode

will

appeared

either

side

the

flyback

tine

(Refer

Figs.

6-A

B).

Align

the

T1,

that

the

maximum

sensitivity

and

symmetrical

wave

mode

will

obtained

setting

the

marker

10.7

MHz

the

peak

(Refer

Fig.

6-B).

Align

the

that

the

symmetrical

‘’S’’

curve

will

obtained

setting

the

marker

10.7

MHz

the

center

the

“S"

curve

(Refer

Fig.

6-C).

Fig.

6-A

Fig.

6-B

Fig.

6-C

No.

1409

RC-250L/LB

Alignment

Input

(SSG):

Use

terminal,

modulation

400

Hz,

modulated

22.5

kHz

deviation.

Input

Signal

Step

Frequency

Place

aligned

Set

the

Capacitor

Band

Frequency

Given

—

87.5

MHz

Rod

Antenna

Maximum

109

MHz

Terminal

TC-2

Minimum

Repeat

the

Steps

MHz

een

eine

[

MHz

Signal

106

MHz

Terminal

TC-1

106

MHz

Signal

Repeat

the

Steps

and

adjust

for

further

improvement.

Parts

Arrangement

for

Alignment

uty

creas

TP2@-|1c2__

tea_}

TC5

TC6

T3ypgIP5

1P7

t7L]LIT6

Fig.

Adjustment

Cassette

Mechanism

Playback

Torque

The

playback

torque should

within

g-cm.

the

torque

less

than

g-cm,

set

the

two-flat

clutch

spring

plate

the

take-up

reel

disk

the

position.

the

torque

exceeds

g-cm,

set

the

spring

plate

the

position.

Note:

Before

adjusting

the

torque

wipe

off

the

surface

rubber

parts

and

rotating

parts,

the

torque

not

sufficient.

No.

1409

Fast

Forward

Rewind

Torque

Fast

Forward

Torque

the

fast

forward

mode,

check

that

the

F.F.

torque

within

130

g-cm

applying

the

torque

gauge

the

take-up

reel.

Rewind

Torque

the

rewind

mode,

check

that

the

rewind

torque

within

130

g-cm

applying

the

torque

gauge

the

supply

reel.

Thrust

Flywheel

The

clearance

between

the

top

flywheel

spindle

and

the

flywheel

bracket

should

within

0.1

0.3

mm.

the

clearance

out

limits,

adjust

the

adjusting

screw

for

normal

value.

Note:

After

adjustment,

fix

the

screw

with

lock

adhesive.

Adjusting

Screw

0.1

~0.3

Fig.

Location

Heads

The

play/record

and

erase

heads

should

positioned

shown

below

the

playback

mode.

Rec/Play

Head

Erase

Head

Guide

Fig.

RC-250L/LB

Pressure

Pinch

Roller

Setting

the

mechanism

vertically

the

playback

mode,

the

pinch

roller

should

stop

turning

the

pressure

380~450

when

the

pinch

rcller

arm

has

been

pulled

upwards

tension

gauge

shown

Fig.

11.

the

pressure

out

limit,

change

the

pinch

roller

spring.

Note:

the

pressure

excessively

high,

may

cause

the

noise

from

the

pinch

roller

bearing

and

defec-

tive

wow

and

flutter.

the

pressure

defective-

low,

may

cause

defective

auto

stop

motion

and

wow

and

flutter.

Tension

Gauge

Pinch

Roller

Arm

Capstan

Pinch

Roller

Fig.

TAPE

SPEED

The

tape

speed

should

within

2940

(—2%)

3090

(+3%)

reference

tape.

the

speed

out

limit,

adjust

inserting

the

small

screw-driver

into

the

adjusting

hole

motor.

the

speed

less

than

--2%

turn

the

driver

clock-

wise.

the

speed

over

+3%,

turn

the

driver

counter-

clockwise.

©)

Adjusting

Hole

Fig.

No.

1409

RC-250L/LB

Block

Diagram

Playback

Radio

Reception

Mode

2501342

281342

CONVERTER

2SC460

IF/AM

CONVERTER/

EQUALIZER

DETECTOR

2SC458

EQUALIZER

POWER

AMP

Fig.

Recording

Mode

X1-2SC1342

X2.

28C1342

28C460

2S5C460

FM/AM

CONVERTER

DESCRIMINA-

TOR

pag

INS4A

DETECTOR

2SC460

IF/AM

CONVERTER

PRE

AMP

25C458

PRE

AMP

1C-1

BA527

POWER

RECORDING

2SC458

ALC

Fig.

No.

1409

RC-250L/LB

Wiring

Connection

ROD

ANT.

MECHA.

ASS'Y

R/P

HEAD

LEAF

SW.

No.

1409

RC-250L/LB

Schematic

Diagram

RC-250L/LB

rT”

OY Oe

———

are

ezED>

eee

Siesta

cecum

anal

ral

—_——_

25C1342(B)

CONY]

2S¢1342(8)

0460(C)

DEANE

C4600)

R20

220K

‘|

TP]

RF.

C8),

,,5P

(ay)

5.0%)

HV80

C40

0.022u

C29

0.06

C10

1000P

L5_

DISHYB0

TC3

—{—

—

MW)

Ri2

1000.

R13

330:

LAAA-]

10E1x4

D1)

WO3Bx4

C83

0.022u

mene

ere

C82

0.022u

C8l

0.022u

D12

C84

0.022u

C85

4700P

C0265-006

ees

2S5C460(C)

CONV

PRE

AMP]

VMME62N

C49

0.022y

PLAYBACK

C50

33p

10V

Lanna

£3.

RECORD

-015

R54

150N

C65

220P

MMI6FEMK

T41572-001

1»

R36

22K

R55_33K

470y

10V

vono2n-002

SPKR

ple

ale

a(|

25C458(D)

PRE

AMP

C55

220P

EAS9P71S

C72

3900P

Ré1_z700

25c458(0)

ALC]

0a‘

rave0

——

CTR?

15K

NOTES

1{SW.

NO|PARTS

NO.

FUNCTION

POSITION

VOLTAGES

ARE

MEASURED

WITH

SIGNAL

USING

Biss

V.TV.M

FM-PLAY.

(

)VALUES

MW-RECORD.

«PLAYBACK

SYMBOL

MARKS

CIRCLED

RESISTORS

ARE

’

PRINTED

CARBON

RESISTORS.

RECORD

LWo

Play

Rec

TAPE

Shaded

parts

show

safety

assurance

parts.

Fig.

No.

1409

A40=

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