Lenco R25 User manual

Lenco

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AM/FM

STEREO

RECEIVER

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eEmMCco

Stereo

Receiver

R25

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Correct

Ordering

of

Spare

Parts

When

ordering

spare

parts

please

specify

the

complete

name,

part

number,

and

the

relevant

page

number

of

the

service

manual

for

each

required

part.

By

this

method

you

will

be

sure

to

obtain

the

required

part.

Contents

U

>

a

Technical

Data

General

Troubleshooting

Chart

FM

Alignment

Procedure

|

AM

Alignment

Procedure

Protection

Circuit

Transistor

Views

Dial

Cord

Stringing

Description

of

Exploded

View

Exploded

View

Block

Diagram

P.C.B.

and

Parts

List

Schematic

Diagram

—s

N

=

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Lenco

R25

The

R

25

receiver

conforms

to

the

most

recent

technical

de-

velopments.

Its

functional

design

includes

arrangement

of

all

operating

controls

for

convenient

operation.

Technical

Data

Amplifier

Section

Nominal

Power,

8

Distortion

at

1

KHz

with

output

from

both

channels,

19

W

Frequency

Response

Power

Bandwidth

Sensitivity,

Phono

Equalization,

Phono

Sensitivity,

Microphone

Sensitivity,

AUX,

TAPE

Treble

Control

Bass

Control

Loudness

Weighted

S/N

Ratio,

to

DIN

—

Phono

—

AUX,

TAPE

Cross

Talk

2x19W

0.5

%o

10—40,000

Hz

20—20,000

Hz

2.5

mV

/

50

k22

RIAA

+

1.5dB

2.5

mV

/50

kQ2

160

mV/50kQ2

+10dBat

10kHz

*+10dBat100

Hz

+

7dBat100

Hz

+

4dBat

10kHz

=>

60

dB

>

62

dB

=

52dB

at

1kHz

>

33

dB

at

10

kHz

General

Troubleshooting

Chart

lf{the

set

is

otherwise

operating

satisfactorily,

the

more

com-

mon

causes

of

trouble

may

be

generally

attributed

to

the

fol-

lowing:

1.

Incorrect

connections

or

loose

terminal

contacts.

Check

the

connection

of

speaker,

record

player,

tape

recorder,

antenna

and

power

cord.

FM

Section

Antenna

Connections

Tuning

Range

Sensitivity

(mono,

60

Q

input,

26

dB

S/N

A

f

=

40

kHz)

Limiting

level

Distortion,

mono

S/N

Ratio

(mono,

input

1

mV)

Capture

Ratio

IF

Rejection

Image

Rejection

Frequency

Response

Channel

Separation

Stereo

switching

level

AM

Section

Frequency

Range

MW

Sensitivity

(S/N

20

dB)

Distortion

240—300

22

Sym.

60—

75

Q

Asym.

87.5—108

MHz

1.8

vV

1.5

nV

0.2

%

>

55

dB

1.5

dB

=

90

dB

=

80dB

20—15,000

Hz

=

40

dB

5

uv

525—1650

kHz

30

uV

(ant.

input)

2

%o

Image

Rejection

=

45

dB

S/N

Ratio

=

45

dB

General

Data

Power

Consumption

150

W

max.

Dimensions

490

x

390

X

132

mm

Weight

11

kg

2.

Improper

operation.

Before

operating

any

audio

com-

ponent,

be

sure

to

read

the

manufacturer's

instructions.

3.

Improper

location

of

audio

components.

The

proper

posi-

tioning

of

components,

such

as

speakers

and

turntable,

is

vital

to

stereo.

4.

Defective

audio

components.

The

following

are

some

other

common

causes

of

mailfunction

and

what

to

do

about

them.

Program

Sympton

Probable

cause

What

to

do

AM,

FM,

1.

Constant

or

intermittent

1.

Discharge

or

oscillation

caused

by

__1.

Attach

a

noise

limiter

to

the

electical

MPX

noise

heard

at

times

or

electrical

appliances,

such

as

appliance

causing

the

noise,

or

io

the

reception

in

a

certain

area

fluorescent

lamp,

TV

set,

D.C.

motor

amplifiers

power

sources

rectifier

or

oscillator

2.

Install

an

outdoor

antenna

and

ground

the

2.

Natural

phenomena,

such

as

set

to

raise

the

signal-to-noise

ratio

atmospheric

static

or

thunderbolts

3.

Reverse

the

power

cord

plug

3.

Insufficient

antenna

input

due

to

4.

If

the

noise

occurs

at

a

certain

flequency,

ferroconcrete

wall

or

long

distance

attach

a

wave

trap

to

the

antenna

input

from

the

station

5.

Keep

the

set

ata

proper

distancs

from

4.

Interference

from

other

electrical

other

electrical

appliances

2.

The

needle

of

the

signal

1.

The

set

is

located

in

a

weak

signal

1.

Place

the

set

to

receive

maximun

signal

and

tuning

meter

does

area

strength

not

move

very

much

2.

An

FM

or

TV

broadcasting

station

2.

Ground

the

set

to

the

earth

is

near

at

hand

3.

The

zero

point

of

the

1.

Regional

difference

in

field

intensity

1.

The

unit

is

not

at

fault

meter

not

stable

AM

1.

Noise heard

at

a

particular

1.

Due

to

the

nature

of

AM

broadcast

1.

In

some

cases,

the

noise

can

be

reception

time

of

a

day

in

a

certain

eliminated

by

grounding

the

setor

area

of

any

part

of

dial

2.

High-frequency

noise

1.

Adjacent

channel

interference

or

beat

interference

2.

TV

set

too

close

to

audio

system

3.

Broadcasting

interference

1.Antenna’s

input

sensitivity

is

too

strong

i

A

1.

reversing

the

power

cord

plug-rceptacile

connections

Although

such

noise

cannot

bedi

minated

by

the

set,

itis

advisable

to

adjut

the

TREBLE

control

from

midpoint

>

lett

and

switch

on

the

HIGH

FILTER

2.

Keep

the

TV

set

at

a

proper

distrace

1.

from

the

audio

system

Connect

resistor

(1K-10K)

in

serezs

to

antenna

terminal

Note:

FM

reception

is

affected

considerably

by

transmission

condition

Probable

cause

1.

Poor

noise

limiting

effect

or

too

low

S/N

ratio

due

to

insufficient

antenna

input

of

station

power

and

antenna

efficiency.

As

a

result,

you

may

receive

one

station

quite

well

while

receiving

another

station

poorly

1.

Ignition

noise

caused

by

an

automobile

engine

1.

This

results

from

the

nature

of

the

FM

reception.

As

the

station

signal

becomes

weak,

the

noise

limiter

effect

is

decreased

and

the

amplification

of

the

limiter,

in

turn,

is

enlarged

generating

noise

Program

Sympton

FM

1.

Noisy

reception

2.

Noise

heard

like

scratching

3.

Tuning

noise

between

Stations

FM/MPX

1.

Noise

heard

during

reception

FM/MPX

reception

while

not

heard

during

FM

mono

reception

2,

Clearness

of

channel

separation

decreases

during

reception

-

3.

The

stereo

indicator

blinks

on

and

off

Record

1.

Hum

or

howling

playing

or

tape

playback

2.

Surface

noise

All

stereo

BALANCE

control

is

not

at

programs

midpoint

when

equal

sound

comes

from

left

and

right

channels

—

.

Weaker

signal

because

the

service

area

of

the

FM/MPX

broadcast

is

only

half

that

of

the

FM

mono

broadcast

—

.

Excess

heat

in

IC

—

.

Interference

Too

weak

RF

signal

.

Record

player

placed

too

close

to

speaker

.

Wire

other

than

shielded

wire

used

Loose

terminal

contact

.

Shielded

wire

too

close

to

line

cord,

fluorescent

lamp

or

other

electrical

appliances

5.

Nearby

amateur

radio

station

or

TV

transmission

antenna

1.

Worn

or

old

record

2.

Worn

stylus

3.

Stylus

dusty

4.

Improper

needle

pressure

—]

NM

oD

It

is

important

to

adjust

for

equal

sound

comes

from

both

channels.

It

should

not

always

be

set

to

the

midpoint

What

to

do

1.

Install

the

antenna

for

maximum

signal

strength

2.

lf

this

does

not

prove

effective,

use

an

outdoor

antenna

designed

exclusively

for

FM.

When

you

use

a

TV

antenna

for

both

TV

and

FM

with

a

divider

make

sure

TV

reception

is

not

affected

3.

An

exclusively

long

antenna

may

cause

noise

.

Install

the

antenna

and

its

lead-in

wire

in

proper

distance

from

the

road

or

raise

the

antenna

input

as

described

above

.

Turn

the

MUTING

switch

on.

It

reduces

the

sensitivity,

and

therefore

it

should

be

used

sparingly

—t

hk

—s

.

install

the

antenna

for

maximum

antenna

Input

2.

Switch

on

the

high

filter

and/or

turn

the

TREBLE

control

from

midpoint

to

left

3.

Switch

to

mono

.

Circulation

of

air

is

important

to

the

set.

Be

sure

that

air

is

flowing

under

the

set

.

Switch

of

for

a

time

.

The

indicator

is

not

at

fault,

adjust

VR

101

.

Switch

to

mono

.

Place

a

cushion

between

the

player

and

the

speaker

or

place

them

further

away

from

each

other

2.

The

connecting

shielded

wire

should

be

as

short

as

possible

3.

Switch

on

the

LOW

FILTER

and

adjust

the

BASS

control

from

midpoint

to

left

4.

Consult

the

nearest

Radio

Regulatory

Bureau

.

Recondition

the

playback

head

of

the

tape

recorder

or

the

stylus

of

the

record

player

2.

Adjust

the

TREBLE

control

3.

HIGH

FILTER

on

set

the

MODE

switch

to

mono

and

then

set

the

BALANCE

control

to

a

position

where

equal

sound

comes

from

both

channels

—s

—/

ND

—/

AO

—

oor

aah

Lisette

Lint

aa

these

Ma

ll

tas

i

alba

t

$

H

Hi

4

i

3

a

‘

i

‘

4

a

*

&

i

a

F

&

¥

5

FM

Alignment

Procedure

Step

Align

Generator

Dial

setting

Adjust

for

1.

OIF

Front

end

!F

Maximum

noise

output

2.

Discriminator

1)

Sweep

generator

FM

detector

T101

Maximum

S

curve

top

and

bottom

core

2)

98

MHz

400

Hz

T101

Center

meter

98

MHz

Center

position

Top

core

T101

Minimum

distortion

Front

end

IF

Minimum

distortion

i

3.

OSC

88

MHz

400

Hz

88

MHz

Front

end

Lo

Maximum

75

kHz

deviation

4.

OSC

108

MHz

400

Hz

108

MHz

Front

end

Tco

Maximum

75

kHz

deviation

ni

ee

00.

5.

Reiterate

3

and

4

6.

High-frequency

§

90

MHz

400

Hz

90

MHz

Front

end

Maximum

Amp.

circuit

75

kHz

deviation

LR1,LR2,LA

7.

High-frequency

106

MHz

400

Hz

106

MHz

Front

end

Maximum

Amp.

circuit

75

kHz

deviation

TCR1,

TCR2,

TCA

8.

Reiterate

6

and7

9.

FM

Stereo

lamp

VR101

19

kHz

setting

with

frequency

counter

connected

to

P123

10.

Stereo

separation

98

MHz

400

Hz

98

MHz

VR102

Maximum

output

difference

75

kHz

deviation

between

P119,

P12)

output

one

channel

only

from

L

output

andthat

from

R

output

of

SSG

a

Note:

To

align,

connect

the

output

of

FM

SSG

to

75

ohm

an-

tenna

terminal

and

connect

the

FM

output

P119

or

P120

to

VTVM

or

oscilloscope

to

indicate

output.

AM

Alignment

Procedure

Step

Align

SSG

Dial

setting

Adjust

for

1.

IF

455

kHz+30

kHz

IFT1

TOO3

Best

IF

curve

1FT2

TO04

Maximum

2.

OSC

535

kHz

535

kHz

OSC

TO02

Maximum

400

Hz

30

%

modulation

3.

OSC

1600

kHz

1,600

kHz

OSC

trimmer

Maximum

400

Hz

Front

end

AM2

30

%o

modulation

Sa

i

ee

SS

ee

4,

Reiterate

2and3

5.

RF

AMP

600

kHz

600

kHz

RF

coil

T001

Maximum

400

Hz

30

°%

modulation

6.

.

Antenna

—

1,400

kHz

~

1,400

kHz

Frontend

|

Maximum

Circuit

400

Hz

AM1,

AM3

|

30

%o

modulation

nn

Note:

To

align,

connect

AM

S.S.G.

to

AM

antenna

terminal

and

connect

oscilloscope

and

VTVM

to

P008

to

indicate

out-

put.

fae

ae

eee

LAPT

pi

i

1

she

PLA

Git

:

&

i

4

3

i

'

i

¥

i

4

g

a

j

2

*

i

Protection

Circuit

Current

Limiter

‘L’

This

circuit

is

designed

as

a

protection

circuit

to

protect

the

speakers

and

power

transistors

from

damage

when

the

out-

put

current

increases

due

to

an

output

short

or

overload.

if

the

current

through

R520

and

R521

gives

a

voltage

drop

across

the

resistors

which

is

greater

than

the

turn

on

voltage

of

Q506

and

Q508,

then

Q506

and

Q508

are

turned

on

and

the

input

to

Q504

and

Q509

is

shunted.

Hence

this

circuit

protects

the

power

transistors

and

speakers

from

damage

by

limiting

the

current.

Transistor

Views

E

2SC

828

B

C

E

25C

1166

2SA

661

B

C

E

2SA

841

2SC

733

2SA

561

2SC

734

2SC

374

2SC

1681

28C

381

2SC

732

R-25

DIAL

CORD

STRINGING

DIAL

PULLEY

2SC

789

Ys

ti—“‘“ONCCCOUN

—————

8

>

C

ha

E

2SA

794

Description

of

Exploded

View

.

Handle

Knob

.

Felt

(lever

switch)

.

Bezel

(push

switch)

10.

Bracket,

phone

jack

11.

Bracket,

power

switch

12.

Front

frame

13.

Power

switch

14.

Phone

jack

15.

Speaker

switch

16.

Pivot

17.

Roller

18.

Push

switch

19.

Roller

20.

Scale

21.

LED,

LED

holder

22.

Meter

(tuning,

signal)

23.

Dia!

pointer

24.

Acryl

reflector

25.

Bracket,

lamp

holder

OONDARONS

.

Lamp,

grommet

.

Bracket,

left

side

.

Cover,

left

side

.

Cover

upper

.

Main

frame

.

Elect.

cap.

4700

uF/35

wV

.

Power

transformer

.

Heat

sink

.

P.C.B.

pre-amp.

.

Bracket,

right

side

.

P.C.B.

switch

.

Tuning

mechanism

assy

.

Front

end

.

Bottom

cover

.

Rubber

foot

.

Cover,

right

side

.

AC

socket

.

Rear

frame

.

Socket

protector

.

Antenna

terminal

.

Speaker

terminal

.

AC

cord

with

plug

.

Voltage

selector

.

AM

antenna

assy

i

§

4

i

;

{

;

$

i

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LENCO R25 User manual

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