Sherwood RV-4050R Manual de usuario

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SERV.

A455

SERVICE

MANUAL

|

RV-4050R

AUDIO/VIDEO

PRO-LOGIC

RECEIVER

Qsherwood

DTeMLIMNE

M

AUDIO.

VIDEO

MECEIVER

Rv

40508

=»

CONTE

Safety

PrecautiOnS--------+-s

see

ee

2

Specifications

A

3

Wirtng

Diagram

LULL.

7

Block

Diagram

BO

9

Circuit

Description

---------e

rt

11

Alignment

Procedures

=

2...

7

Troubleshooting

-----:---.--e

ester

20

G

Sherwood

NTSs

Mechanical

Parslist

=

=

==

=

=

=

==

28

Exploded

View...

cect

25

Printed

Circuit

BoardS-----t

27

Electrical

Parts

List

<=

32

IC'S

Lead

Identifications

&

Internal

Diagram

---38

Transistors

Lead

Identification

--------

43

Schematuc

Dieagramsti

[1

il)

45

SAFELY

PHEULAYU

LIVINDS

WARNING

Before

servicing

this

unit,

familiarize

yourself

with

the

following

precautions:

-

1.

N

Many

electrical

and

mechanical

parts

in

this

chassis

have

special

safety

characteristics

that

often

pass

unnoticed

and

the

protection

afforded

by

them

cannot

necessarily

be

obtained

by

using

replacement

components

rated

for

higher

voltge,

wattage,

etc.

Replacement

parts

that

have

these

special

safety

characteristics

are

identified

in

this

manual

and

its

supplements:

electrical

components

having

such

features

are

identified

by

-t.

in

the

schematic

diagram

and

the

parts

list.

Before

replacing

any

of

these

components,

read

the

parts

list

in

this

manual

carefully.

The

use

of

substitute

replacement

parts

that

do

not

have

the

same

safety

characteristics

as

specified

in

the

parts

list

may

create

shock,

fire,

or

other

hazards.

.

Before

returning

the

set

to

the

customer,

always

do

an

AC

teakage

current

check

on

the

exposed

metal

parts

of

the

cabinet,

such

as

terminals,

screw

heads,

and

metal

overlays,

to

be

sure

the

set

is

safe

to

operate

danger

of

electrical

shock.

Plug

the

AC

line

cord

directly

into

a

120

V

AC

outlet

(120

V

AC

version

only).

(Do

not

use

a

line

isolation

transformer

during

this

check.)

Be

sure

your

AC

voltmeter

has

a

sensitivity

of

5000

<2

per

volt

or

greater.

Then

connect

a

1500

{2

10

watt

resistor,

paralleled

by

a

0.15

pF

150

V

AC

capacitor,

between

a

known

good

earth

ground

(such

as

a

water

pipe,

or

conduit)

and

the

exposed

metalic

is

parts,

one

at

a

time.

Measure

the

AC

voltage

across

the

combination

of

a

1500

Q2

resistor

and

a

0.15

pF

capacitor.

Reverse

the

AC

plug

at

the

AC

outlet

and

repeat

AC

voltage

measurements

for

each

exposed

metalic

part.

Voltage

measured

must

not

exceed

0.75V

RMS.

This

corresponds

to

0.2

mA

AC.

Any

value

exceeding

this

limit:

constitutes

a

potential

shock

hazard

and

must

be

corrected

immediately.

At

5000

2

per

voit

or

greater

sensitivity

,

the

reading

should

not

exceed

0.75

V.

AC

Voltmeter

Good

earth

ground,

such

as

@

water

pipe

or

Conduit.

0.15

~F

1S0V

AC

Place

the

probe

on

each

exposed

metalic

part.

,|

Audio

Section-Front(Mode

:

Dolby-logic)

SPECIFICATIONS

Audio

Section-Front

(Mode:

Normal)

RMS

output

power

:

at

distortion

below

0.3

%

50

Hz

both

channels

driven

at

8

Q

at

distortion

below

0.3

%

1

kHz

both

channels

driven

at

8

Q

inter-modulation

distortion

at

80

W

output

60

Hz:

7

kHz

=4:

1

SMPTE

Harmonic

distortion

at

45

W

output

:

40

Hz

1

kHz

20

kHz

Frequency

response

at

AUX

8

Q

load,

1

W

output

20

Hz

-

40

kHz

Input

sensitivity

for

50

W

output

:

CD/AUX

Tone

control

BASS,

100

Hz

TREBLE

10

kHz

Channel

separation

with

4.7

kQ

shorted

at

AUX

input

1

kHz

10

kHz

Signal

to

noise

ratio,

input

shorted

with

IHF-A

CD,

TV/AUX,

TAPE(MONI)

(Condition

:

input

VCR,

input

level

1

kHz

350mV

vol.

level)

RMS

output

power

at

distortion

below

0.9%

1

kHz,

8

Q

Signal

to

noise

ratio,

input

shorted

with

IHF

“A*

(Dolby

prologic,

3

Stereo)

Frequency

response

8

Q

load,

1

watt

output

at

-3

dB

(Dolby

prologic)

Audio

Section-Center

40~20000

50~20000

RMS

output

power

at

distortion

below

0.9%

1

kHz,

8

2

Signal

to

noise

ratio,

input

shorted

:

;

dB

2

78

=

73

with

JHF "A*

(Dolby

prologic,

3

Stereo)

Frequency

response

8

Q

load,

1

watt

output

[Normal

|

Hz _|

at

-3

dB

(Dolby

proiogic)

[Wide

|

Hz

Audio

Section-Rear

=

RMS

output

power

at

distortion

below

0.9

%

1

kHz,

16

Q

100-17000

Signal

to

noise

ratio

input

shorted

with

IHF

°A*

(Dolby

prologic)

Delay

20

ms

Frequency

response

8

Q

toad,

1

watt

output

h

80-7000

|

100-6000

at

-3

dB

(Dolby

prologic)

FM

Section

Tuning

coverage

for

USA

/

Canada

Tuning

coverage

for

Europe

Usable

sensitivity

at

noise

&

distortion,

S/N

30

dB

75

ohm

input

Image

rejection

at

106

MHz

IF

rejection

at

90

MHz

Full

limiting

at

-3

dB

50

dB

quieting

sensitivity

at

98

MHz:

MONO

STEREO

Distortion

at

1

mV

input:

MONO

STEREO

Signal

to

noise

(S/N)

ratio

at

1

mV

input

MONO

STEREO

De-emphasis

at

100-12,000

Hz

AM

rejection

ratio

at

100

uV-20

mV

input

Search

level

at

98

MHz

Output

voltage

at

75

kHz

dev.

:

MONO

1

kHz

mod.,

1

mV

input

STEREO

Muting

threshold

at

98

MHz

Overload

THD

at

98

MHz,

100

%

mod.

at

100

mV

RF

input

Spurious

response

at

98

MHz

antenna

input

3

pV,

1/21F,

2x1/21F

Capture

ratio

at

1

mV

input

Alternate

channel

selectivity

at

0.1

mV.input

Stereo

separation

:

at

100

%

mod.,

1

mV

input

1

kHz

10

kHz

Distortion

:

at

100

%

mod.,

1

mV

input

through

IHF

Filter

MONO

STEREO

Automatic

stereo

threshold

AM

Section

Tuning

coverage

for

USA

/

Canada

Tuning

coverage

for

Europe

Usable

sensitivity

600

kHz,

1010

kHz,

1400

kHz

(603

kHz,

1008

kHz,

1404

kHz

for

Europe)

at

400

Hz,

30

%

mod.,

S/N=-20

dB

Image

rejection

at

1400

kHz

(1404

kHz

for

Europe)

IF

rejection

at

600

kHz

(603

kHz

for

Europe)

AGC

figure

of

merit

from

100

mV/m

at

1010

kHz

(1008

kHz

for

Europe)

Distortion

at

400

Hz,

30

%

mod.,

5

mV/m

input

IF

bandwidth

at

6

dB

down,

350

2

V/m

input

Output

voltage

at

400

Hz,

30

%

mod.,

5

mV/m

input

Audio

response

at

5

mV/m

input

1

kHz

0

dB,

1010

kHz

(1008

kHz

for

Europe),

-6

dB

Selectivity

at

10

kHz

350

4V/m

input

Signal

to

noise(S/N)

ratio

at

1010

kHz

(1008

kHz

for

Europe)

with

antenna

input

5

mV/m

RF

overload

400

Hz

80

%

mod.,

100

mV

input

Search

level

MHz

MHz

kHz

kHz

puV/m

dB

dB

d8

%

kHz

mV

Hz

dB

dB

%

pV/m

87.5-107.9

87.50-108.00

43

30

0.35

0.5

6

520-1710

522-1611

Limit

2.0

5-12

200+50

70-1.8000

20

35

-

10

800

+60B

General

Speaker

load

impedance

Power

consumption

:

Ne

load,

(No

sig

mall

i

sicoesce

2i250.

15

Mec

tatecet

aa

ds

shed

te

toa

hes

thea

res

cance

N

Neti

2a

Stee

an

ceans

ately

1/8

Pmax.

Pmax.

(Undistorted

output)

--

Pmax.

(THD

10%)

Pmax.

(Undistorted)

with

outlet

--

Dimensions

(W

x

H

x

D)

440

x

110

x

280

mm

(17-5/16

x

4-11/16

x

11

inch)

Weight

(Net)

(16.5

Ibs)

Power

Requirment

A:

120

V,

60

Hz

for

American/Canadian

Version

‘

B:

120/220

V,

60/50

Hz

for

muit-voltage

version

(switchable)

D:

230

V,

50

Hz

German/Gerneral

European

version

E:

240

V,

50

Hz

for

UK/Austalian

version

oa

G:

220

V,

50

Hz

for

Other

Area

;

Notes

:

1.

Norminal

specs

represent

the

design

specs.

All

unit

should

be

able

to

approximate

these

some

will

exceed

and

some

may

drop

slight

below

these

specs.

Limit

specs

represent

the

absolute

worst

condition

that

still

might

be

considered

acceptabie;

in

no

case

should

a

unit

fail

to

meet

limit

specs.

2.

This

manual

is

based

on

the

General

European(D)

standard,

and

provieds

information

on

regional

circuit

modification

through

the

use

of

alternate

schematic

diagrams

or

wiring

diagram,

and

information

on

regional

component

variations

through

the

use

of

parts

lists.

Design

and

specifications

subject

to

change

without

notice.

WIRING

DIAGRAM

TUNER

B'D

4001001010

SPPI

PRUs!

Prins

POWER

B'D

4005011500

MAIN

B'D

4001000900

4001001000

POWER

S/W

B'D

4001000910

VOLUME

8'D

4001001020

Model

No.

:

RV-4050R

BLOCK

DIAGRAM

Model

No.

:

RV-405

PL

Torrey

MATFT

-

CF

AUS

CF

aaa

N/

bL

Littta

as

Fu

|

O

ANT

am

|

©

UATA

Cur.

ce

TUNED

ONO

FM

———=

1c402

“INPUT

PARTS

i

1

t

'

an

REGULATCR

:

Sv

GULATOR

.

;

?

1-SURROUND

PARTS

Re

ae

oR

(VERSION:A,0.xS)

a

|

/

hea

MUTE

»

f

1Sv

1sv

=

mall

as10

TES

PART

;

-15v

-15v

1

\

'

1

i

{

Lao2

1403

Crao3

-POWER

SUPPL

PARTS;

FRONT

AMP

sce,

eee

ais

fa

pes

eae

mae

a

ee

ce

CENTER

AMP

y

AC

INPUT

REAR

AMP

©

IC101

eee

psccme

1

:

o7

oO

Of

PRO-LOGIC

OFF

10103

1

1

ELECT.

vO.

IC

(

BALANCE

VOL.

I1¢104

MAIN

VOL

as

MAIN

V

'

t

T/M

OFF

'

‘

Sela)

Stee

rout)

ree

TAPE

MON

1

'

PRO-LOGIC/

2408

3

STEREO

“©

io

!

f

wee

cies

1

PROGECT

ELECT

a

a

vou

ae

CENTES

:

1208

1608

aA

;

~~

-

6

O

;

Tc202

i

;

ME

—©)

‘

=

Piney

ace03

1C108

1¢205

eee

NEMS

DOLBY

PRO-LOGIC

'

ot

;

TA

ee

ere

le

r

)

vou

us

1208

1608

MUTE

{

)

iis

4

SURROUND

see

3208

DIGITAL

DELAY

NUUS7TC

1

9

10

CIRCUIT

DESCRIPTION

1C501:

CXP50116-5720

(4-bit

CMOS

Microprocessor}

1.

Pin

Configuration

TEST

MODE

3

CONTROL

-—>

TEST

MODE

2

CONTROL

>

TEST

MODE

1

CONTROL

a

—>

CENTER

MODE

2

CONTROL

r=)

ST/BY

CONTROL

ST/BY

LED

TUNER

MUTE

FM/AM

STEP

2

OPTION

=0—

FM/AM

STEP

1

OPTION

£)—e

CENTER

MODE

1

CONTROL

S—

2)

—~»

Q\—-

Cy

—e»

Da

rd

ey

G)—

TUNER

TUNE

G3-——

STEREO

§2-<——

MASTER

VOLUME

NJUS701

CHIP

ENABLE

PRO-LOGIC

MODE

CONTROL

FIP

3

6f—e

CENTER

MUTE

DRIVE

SEGMENT

58

9

6$—e

MAIN

MUTE

CXP-50116-5720

}—»

M7001

CHIP

ENABLE

CONTROL

IC

DATA

CONTROL

IC

CLOCK

C7821

DATA

MUTE

«—({)

I—e

LOGIC

DECK

PLAY/PAUSE

CONTROL

DIGI-LINK

HEADPHONE

REMOCON

PROTECTION

4)

VIDEO

1

=~

1

2.

Key

Matrix

3.

Block

Diagram

KSCAN

0

|

KSCAN

1

|

KSCAN

2

|

KSCAN

3

|

KSCAN

4

|

KSCANS5

|

KSCAN8

PIN

28

PIN

27

PIN

26

PIN

25

PIN

24

PIN

23

PIN

22

KEY

INO

TUNING

VCR

2

MEMORY

PIN

35

KEY

IN

1

SURROUND

TREBLE

TV/AUX

VCR

2

TAPE

PIN

36

MODE

MONITOR

KEY

IN

2

ALANCE

PIN

37

@-@

@-©@

S-®

SEGMENT

SEGMENT

adieas

MO;

FORT

SIGNAL

siGNAL

_A/O

@-@

@-@ @-®

@-@

B-@

6-@

Hs"

Boss

RAH

}

Sino

Je

eS

u

[

goat's

|

wore

[rot

¢

|

roar]

ponte

[rer

r

[vont

o

[pont

w

|

port]

~

teu.

frees

see

se_frer.

Sts

REGISTER

[PROGRAMMABLE

=

8:

4.

Pin

Functions

|

Symbol

_|

Description

16-51

Segment

SON

EE

NE

et

Output

for

FIP.

[Mute

signal

output

ta

LOvO94

SSCS

|

18

DOLBY

Output

for

driving

DOLBY

LED.

|

19

|

3-ST

Output

for

driving

3-STEREO

LED.

|

20-21

|

NC

|

Not

used!

(NC

pins

are

always

connected

to

Vdd).

|

22-28

|

|

T?~TO

__|

Grid

signal

output

for

FIP.

|

29.

|

INT

_|

Data

input

of

Ko~Ks

for

key

scan.

|

30-31

|

=

NC____|_Notused!

Data

input

of

Ko~Ke

for

key

scan.

|

38

|

EVC.MU.

_|

Mute

signal

output

to

prevent

click

noise

when

operating

electronic

VOL.

39/40

VIDIMID2

Control

data

output

for

selecting

VCR1

or

VCR2

video

signal.

According

to

each

mode,

data

output

is

as

follows.

[Mobe

[vib

|

vio2

|

REMARKS

Weng

etc

tes

al

Poruers

|

a

|

a

|

ai

Previous

state

%

Last

memory

function

is

available.

Emitial

settings

|

41

|

M.VOL.IN1

42

CH.

MODE

input

for

main

volume.

Port

for

settings

of

PRO-LOGIC

and

3-STEREO

mode.

According

to

each

mode,

data

output

is

as

follows.

OTHERS

rockers

=u.

SEGMENT

®©-@

|

accumuLaTor

|

Se

QuT

Pur

:

448

|

MEMORY

Fs

x4

=

SEGME

NT

®-e

STS

eS

ID,

ouTPUT

=

BIT

DATA

TIMER

(8)

KS

g

Se-Stt

MEMORY

TIMER

COUNTER

8

:

el

Ee

ee

OO

SERIAL

1/O

(@)

12288

x8

BIT

MEMORY

TIMER

Gaxa

[timer

|

rene]

DISPLAY

MEMOR

96X46

BIT

FL

TUBE

a

EXTAL@)

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12

|

43

|

NCC

Notused!

44

PROT.

Signal

input

for

protection.

When

"L"

is

input,

it

is

changed

to

STAND

BY.

(But

for

first

3

second,

PROTECTION

Is

not

checked.)

45

RMC

Input

for

remocon

data.

(At

"L",

it

is

active.)

46

H/P_IN

When

inserting

headphone,

“H"

is

input.

47

D.

LINK

Input/output

for

controlling

DIGI-LINK.

|

49-50

|

CLK/DATA

|

CLOCK/DATA

output

for

TDA7300,

TC9154,

LC7821,

NJU9701

and

LM7001.

51

CE1

Chip

enable

output

for

LM7001.

|

52

|

_CE2_

_|

Chip

enable

output

for

TDA7300.

|

53

|

CE3

Chip

enable

output

for

TC9154.

ae

54

CE4

Chip

enable

output

for

LC7821.

55

H/P

MUTE

Output

for

headphone

mute.

“H’

is

outputed

under

the

following

conditions.

1.

When

the

power

is

on

or

off.

2.

When

selecting

the

input

function.

3.

When

“H"

is

input

to

H/P

input.

4.

When

"L"

is

input

to

“PROT”

of

CPU.

5.

"-co

"mute

signal

is

transferred

from

the

commander.

13

Symbol

MAIN

MUTE

Description

Output

for

main

mute.

"H”

is

outputed

under

the

following

conditions.

1.

When

the

power

is

on

or

off.

2.

When

“H"

is

inputted

to

H/P

input.

3.

When

°L"

is

inputed

to

"PROT"

of

CPU.

4.

“-co

"

mute

signal

is

transferred

from

the

commander.

Output

for

SURR.

mute.

“H"

is

outputed

under

the

following

conditions.

1.

When

the

power

is

on

or

off.

2.

When

selecting

surround

mode.

3.

When

the

test

tone

mode

is

on

or

off

or

When

the

channel

is

change

in

the

test

tone

mode.

4.

When

°H"

is

inputed

to

H/P

input.

5.

When

°L°

is

inputed

to

"PROT"

of

CPU.

6.*-c

“

mute

signal

is

transferred

from

the

commander.

Output

for

center

mute.

"H"

is

outputed

under

the

following

conditions.

1.

When

the

power

is

on

or

off.

2.

When

the

center

mode

is

on

or

off.

3.

When

selecting

center

mode.

4,

When

the

test

tone

mode

is

on

or

off

or

When

the

channel

is

change

in

the

test

tone

mode.

5.

When

"L"

is

inputed

to

"PROT"

of

CPU.

6,

“-co

_“

mute

signal

is

transferred

from

the

commander.

Output

for

controlling

in

the

surround

mode.

-

SURROUND

MODE

PRO

1

PRO-LOGIC,

3-STEREO

SURR.

OFF

L

|

60

|

_CE5__|

Chip

enable

output

for

NJU9701.

|

61

|

PD

__|

Input

for

power

down.

(At

“L’,

it

is

active.)

62

M.

VOL.

IN2

Input

for

main

volume

up/down.

57

SURR.

MUTE

58

CENTER

MUTE

59

PRO

VOL.

DOWN

VOL

UP

ea

Sine

IN2

~

STEREO

input

for

lighting

the

"STEREO"

Indicator.

{At

"L",

it

is

active.)

TUNED

input

for

detecting

station

during

tuning.

If

“L"

is

inputed

during

tuning,

tuning

stops

at

that

frequency.

14

[

Pin.No.

|

Symbot___|

Description

ASTEP/F.STEP

|

According

to

region,

input

for

selecting

the

frequency

bands

and

steps

of

FM

and

AM.

Setting

are

as

follows.

|

REGION

|

FREQUENCY

STEPS

AMERICA

|

FM:

87.5~107.9

MHZ

AM:

520-1710

kHz

EUROPE

|

FM:

87.5~108

MHz

AM:

522~1611

kHz

KOREA

FM:

87.5~107.5

MHz

|

200

kHz

AM:

522~1611

kHz

9

kHz

T.MUTE

Output

for

tuner

mute.

Output

for

driving

STAND

BY

LED.

(At

"H',

it

is

active).

69/70

CM1/CM2

Contro!

data

output

for

center

mode

in

the

DOLBY

PRO-LOGIC

and

3-STEREO

mode.

Setting

are

as

follows.

we

a

This

pin

prevides

the

ground

potential.

Output

pin

serve

for

connecting

a

clock

oscillator

crystal.

7

Vss

XTAL

~

NS

73

|

NC

Not

used

!

74

EXTAL

Input

pin

serve

for

connecting

a

clock

oscillator

crystal.

NC

Vieo

This

is

the

power

supply

pin

of

the

FL

controller.

NS3~NS1

Control

data

output

for

selecting

channel

in

the

test

tone

mode.

says

77~79

Setting

are

as

follows.

SELECTION

NS1

NS2

NS3

TEST

TONE

OFF

4

:

previous

state

STAND

BY

When

the

power

is

on,

control

data

output

is

“H”.

When

the

power

is

off,

contro!

data

output

is

“L”.

{and

last

memory

function

is

activated.)

18

5.

Digital

Tuning

System

Description

FM

FRONT-END

PACK

2

Se

em

mony

!

I

|

|

I

'

1

'

I

I

i

'

!

i

1

i

&

!

I

4

16

mz,

FM

PLL

Loop

<==]

AM

PLL

Loop

Low

Pass

Filter

Q417,

0418

PLL

Prescaler

FM

IN

1C404

AM

IN

FL

Display

1.

Equipment

Required

¢

AM

signal

generator

«

Oscilloscope

*

AC

voltmeter

«

FM

signal

generator

¢

Stereo

modulator

ALIGNMENT

PROCEDURES

+

Audio

generator

«

Distortion

meter

-+

OC

voltmeter

«

Frequency

counter

Note:

Remove

line

cord

antenna

from

FM

externa!

antenna

terminal

when

aligning.

2.

Alignment

and

Test

Points

(Tuner

P.C.

Board)

3.

AM

IF

and

RF

Alignment

Preparation

g

2

Y

=

y?

;

Se

1.

Output

of

Signai

Generator

should

not

be

higher

than

necessary

to

obtain

an

optimum

output

reading.

2.

Signal

Generator

Modulation

:

30%

3.

Switch

:

Press

to

AM.

Signal

Generator

Frequency

Step

450

kHz

{400

Hz,

Mod.}

600

kHz

{400

Hz,

Mod.}

1400

kHz

(400

Hz,

Mod.)

1000

kHz

(400

Hz,

Mod.)

Receiver

Frequency

on

the

Display

|

Place

at

a

non-

interference

spot

|

around

600

kHz

|

600

kHz

1400

kHz

|

1000

kHz

Equipment

Connection

!

Adjustment

i

Point

for

AC

voltmeter

|

L402

Maximum

to

TAPE

OUT

,

(IFT)

reading

jack.

|

|

L405

Same

as

|

Same

as

Step

1.

i

{ANT

Coil)

--

Step

1

{

Same

as

TC401

Same

as

Step

1.

{ANT

Trimmer)

Step

1

17

|

VR403

Indication

on

|

(AM

ADJ)

receiver

with

:

output

of

500

pV/m

4.

FM

IF

Alignment

Preparation

1.

Signal

Generator

output

should

be

no

higher

than

necessary

to

obtain

an

optimum

output

reading.

2.

Switch

:

Press

to

FM.

3.

Signal

generator

deviation

:

75

kHz.

4.

Be

sure

to

disconnect

FM

line

cord

antenna

during

alignment.

Signat

Generator

Frequency

98.1

MHz

(1

kHz,

Mod.)

98.1

MHz

(1

kHz,

Mod.)

Receiver

Frequency

on

the

Dispiay

Equipment

Connection

Distortion

L403

meter

to

(FM

IFT)

TAPE

OUT

jack

Minimum

distortion

Zero

reading

on

AC

voltmeter

5.

MPX

Alignment

FM

Antenna

Terminal

(3000)

FM

Dummy

with

SSG

output

level

of

6

pV

Tape

out

AM

*

Signal

Generator

Front-End

FE401

AM

Signal

Generator

Direct

Coupling

AM

Alignment

Connection

as

1250

(112.59)

=

O

Zin

=500

(750)

®

3

Z

out=3002

(Balanced)

O

1502

FM

Dummy

Antenna

to

3002

Antenna

terminal

of

receiver

FM

Dummy

Antenna

18

FM

RAIF

and

MPX

Alignment

Connection

Preparation

1.

Switch

:

Press

to

FM.

2.

Tune

for

98

MHz

on

band.

3.

Signal

Generator

output

level:

1000

pV.

4.

Deviation

:

75

kHz,

at

100%

modulation

of

composite

signal.

5.

Connect

Signal

Generator

to

FM

antenna

terminal

through

FM

dummy

antenna

(300

22).

19

kHz

Signal

Output

.

Step

|

Modulation

Generator

indicator

pein

Level

Frequency

Connection

Setting

VR401

(SEP

ADJ)

AC

voltmeter

reading

should

be

at

least

33

dB

below.

AC

voltmeter

to

TAPE

OUT

jack

of

R

channel

Composite

to

channel

1

kHz

“L"

CH.

8%

Mod.

VR401

(SEP

ADJ)

AC

voltmeter

to

Same

as

Step

3.

TAPE

OUT

jack

of

L

channel

Composite

to

channel

1

kHz

“"R®

CH.

8%

Mod.

if

you

could

not

obtain

-35

dB

readings

in

Steps

3

and

4

(compared

with

Step

2),

readjust

VR401

until

you

obtain

-33

dB

readings

for

both

Steps

3

and

4.

Nominal

is

-43

dB.

19