Technics Quartz ST-G7 Manuel utilisateur

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ORDER

NO.

HAD84062801C9

Service

Manual

Tuner

CYUARTZ

Synthesizer

ST-G

A

FM/AM

Stereo

Tuner

eaten

|

(K)

...Black

Type

(S)...Silver

Type

SPECIFICATIONS

(DIN

45

500)

@

FM

TUNER

SECTION

87.50~108.00

MHz

87.525~108.025

MHz

(+25

kHz

shift)

Frequency

range

Sensitivity

1.2

uV

(IHF,

usable)

S/N

30

dB

1.1

pV

(75Q)

S/N

26

dB

1.0

pV

(75Q)

S/N

20

dB

0.9

wV

(75Q)

IHF

46

dB

stereo

quieting

sensitivity

28

pV/75Q

Total

harmonic

distortion

MONO

0.01%

STEREO

0.02%

Dynamic

range

116

dB

Frequency

response

4

Hz~18

kHz,

+0.2

dB~

—0.5

dB

Alternate

channel

selectivity

normal

+400

kHz

55

dB

super

narrow

+200

kHz

25

dB

Capture

ratio

1.0

dB

Image

rejection

at

98

MHz

105

dB

IF

rejection

at

98

MHz

110

dB

Spurious

response

rejection

at

98

MHz

110

dB

AM

suppression

70

dB

Stereo

separation

1

kHz

65

dB

10

kHz

50

dB

Carrier

leak

19

kHz —70

dB

38

kHz

—70

dB

Channel

balance

(250

Hz~6,300

Hz)

+1.0

dB

Limiting

point

0.75

pV

Technics

..

Scandinavia

and

Switzerland

...United

Kingdom

..

southeast

Asia,

Oceania,

Africa,

Middle

Near

East

and

Central

South

America

(K)(S)

|

[XL]

...Australia

(K)(S)

|

[EH]

...Holland

(K)(S)

|

[EB]

...Belgium

(K)(S)

|

[EF]

...France

(K)(S)

|

[PC]

...European

Audio

Club

(K)(S)

|

[PA]

...Far

East

PX

(K)(S)

|

[PE]

...European

Military

(K)(S)

|

[EGA]...F.R.

Germany

Bandwidth

IF

amplifier

180

kHz

FM

demodulator

1000

kHz

Antenna

terminals

75Q

(unbalanced)

@

AM

TUNER

SECTION

Frequency

range

(For

Europe,

South

Africa

and

Australia)

522~1629

kHz

(9

kHz-step)

530~1620

kHz

(10

kHz-step)

(For

Saudi

Arabia

and

others)

531~1620

kHz

(9

kHz-step)

530~1620

kHz

(10

kHz-step)

Sensitivity

(S/N

20

dB)

20

pV,

290

uV/m

Selectivity

(£9

kHz)

55

dB

Image

rejection

at

999

kHz

AO

dB

IF

rejection

at

999

kHz

65

dB

@

GENERAL

Output

voltage

0.6V

Power

consumption

11W

AC

50

Hz/60

Hz,

110V/120V/220V

/240V

430

xX

97

X

76mm

(16-15/16"

X

3-13/16”

x

1-7/8")

Weight

4.1

ky

@

Ib.)

Power

supply

Dimensions

(WxXHXD)

¢

Specifications

are

subject

to

change

without

noice

for

further

improvement.

*

Weights

and

dimensions

shown

are

approximate.

Panasonic

Tokyo

Matsushita

Electric

Industrial

Co.,

Ltd.

1-2,

1-chome,

Shibakoen,

Minato-ku,

Tokyo

105

Japan

Matsushita

Electric

Tradng

Co.,

Ltd.

P.O.

Box

288,

Centry

Osaka

Japan

m@

CONTENTS

Page

Page

SAFETY

PRECAUTION

..........

000

ee

eee

eee

2

FUNCTION

OF

LIQUID

CRYSTAL

PANEL............

16

FEATURES.

core

fe

Scobie:

Sa

a

heh

ay

eines

WTA

Eel

a

She BUA

he

2

WAVEFORMS:

2.2555.

cose

gi

5

BG

a

ok

Fhe

eG

wae

ws

Shei

ts

17

LOCATION

OF

CONTROLS............0+

00

eee

3,4

BLOCK

DIAGRAM

..........

02

e

eee

eee

18,19

HOW

TOOPERATE...........-02.-0

22

ee

eeeee

4~6

CIRCUIT

BOARDS

AND

WIRING

CONNECTION

BEFORE

REPAIR

AND

ADJUSTMENTS

.............

7

DIAGRAM

22.

ieie

8

fee

8

es

Ei

ea

ee

20

~

22

DISASSEMBLY

INSTRUCTIONS

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

7~9

SCHEMATIC

DIAGRAM

..........0

000

eee

23

~

28

HOW

TO

USE

THE

AMLOOP

ANTENNA

.............

10

TERMINAL

GUIDE

OF

TRANSISTORS,

IC’S

AND

MEASUREMENTS

AND

ADJUSTMENTS

.........

10

~

13

DIODES

5

i.e.

200

kee

eS

era

eh

ag

te

tera

Bee

aS

29,

30

FUNCTION

OF

TERMINAL

(MPX

IC301

-AN7471S)......

14

RESISTORS

AND

CAPACITORS

..............

29

~

31

FUNCTION

OF

TERMINAL

(PLL

CONTROLLER

IC902.

REPLACEMENT

PARTS

LIST..............245

31~

33

MIN

12919)

cece

seh

a

oe

oS

eee

ww

ee

Sse

st

eb

ees

eS

ete

14

EXPLODED

VIEW...

1.2...

ee

tt

te

es

33,

34

FUNCTION

OF

TERMINAL

(MICRO

COMPUTOR

!C903

-

MN1554STD)...

2.2...

2-0-0

eee

ee

15

m@

SAFETY

PRECAUTION

.

Before

servicing,

unplug

the

power

cord

to

prevent

an

electric

shock.

.

When

replacing

parts,

use

only

manufacturer’s

recommended

components

for

safety.

.

Check

the

condition

of

the

power

cord.

Replace

if

wear

or

damage

is

evident.

After

servicing,

be

sure

to

restore

the

lead

dress,

insulation

barriers,

insulation

papers,

shields,

etc.

.

Before

returning

the

serviced

equipment

to

the

customer,

be

sure to

make

the

following

insulation

resistance

test

to

prevent

the

customer

from

being

exposed

to

a

shock

hazard.

ORWNH

e

INSULATION

RESISTANCE

TEST

1.

Unplug

the

power

cord

and

short

the

two

prongs

of

the

plug

with

a

jumper

wire.

2.

Turn

on

the

power

switch.

3.

Measure

the

resistance

value

with

onmmeter

between

the

jumpered

AC

plug

and

each

exposed

metal

cabinet

part,

such

as

screwheads

antenna,

contro!

shafts,

handle

brackets,

etc.

Equipment

with

antenna

terminals

should

read

between

3MQ2

and

5.2MQ

to

all

exposed

parts.

(Fig.

A)

Equipment

without

antenna

terminals

should

read

approximately

infinity

to

all

exposed

parts.

(Fig.

B)

Note:

Some

exposed

parts

may

be

isolated

from

the

chassis

by

design.

These

will

read

infinity.

Antenna

terminal

Exposed

Exposed

metal

metal

part

part

Ohmmeter

Ohmmeter

(Fig.

A)

(Fig.

B)

Resistance

=

3MQ2—5.2MQ

Resistance

=

Approx

oo

4.

If

the

measurement

is

outside

the

specified

limits,

there

is

a

possibility

of

a

shock

hazard.

The

equipment

should

be

repaired

and

rechecked

before

it

is

returned

to

the

customer.

@

FEATURES

@

Newly

developed

LS!

successfully

incorporating

both

®@

Self-computing

RF

tuning

circuit

capable

of

receiving

digital

(signal

control)

and

analog

(linear

&

signal

trans-

desired

station

under

the

best

conditions.

Mission)

circuits

in

one

body.

@

FM-IF

automatic

IF

band

selecting

function.

@

Extra-wide

dynamic

range

of

116

dB

(1

kHz),

low

dis-

@

|nput/output

terminal

for

personal

computer

con

nection.

tortion

of

0.01%

{1

kHz),

and

stereo

separation

of

@

Multi-function

LCD

intensive

display.

65

dB

(1

kHz).

@

Reference

signal

0.33

kHz

record

checking

signa

!

Output

@

Linear

detector

and

linear

demodulation

digital

detector

Circuits,

function,

m

LOCATION

OF

CONTROLS

e

Front

Panel

Memory

indicator

Channel

display

Quartz-lock

/FM

muting

off

indicator

FM

stereo

indicator

Power

(

stand-by

-m

on)

©

Recording

level

check

FM

signal-strength

indicator

FM

IF

band

selector

@

FM

muting

off/scan

level

selector

FM

mode

selector

@

FM

IF

band

indicators

(FM

auto

IF)

normal

/a\:

This

indicator

will

illuminate

if

the

signal

is

strong

and

there

is

little

effect

from

interference.

super

narrow

/a\:

This

indicator

will

iluminate

if

the

signal

is

weak

and/or

there

is

interference.

The

illumination

of

the

left

and/or

right

parts

of

the

indicator

indicates

that

interference

waves

are

present

within

+300

kHz

(left:

-,

right:

+)

of

the

tuned

frequency.

@

FM

muting

off/scan

level

selector

(muting)

This

selector

is

used

when

releasing

the

FM

broadcast

muting

function

and

when

setting

the

scan

level

for

FM

broadcasts.

¢

Releasing

the

muting

function

(off)

In

mountainous

areas,

etc.,

where

broadcast

waves

are

weak,

breakup

in

the

sound

can

be

lessened

by

lightly

pressing

the

button.

When

this

is

done,

the

function

is

released

only

for

the

statin

being

received.

However,

when

a

tuning

button

is

pressed

to

begin

scanning,

the

former

scan

level

will

be

used.

©

Setting

the

scan

level

(scan

level)

This

level

setting

is

effective

only

for

the

automatic

preset

memory

and

auto

tuning.

When

the

button

is

held

down,

“dB”

will

be

displayed

and

the

numbers

30, 40,

and

50

will

be

displayed

in

order.

When

the

desired

level

is

reached,

release

the

button.

The

higher

the

level,

the

more

noise

is

reduced.

Stations

with

good

reception

can

use

“

a

high

level”,

but

stations

below

the

set

level

cannot

be

received.

In

order

to

receive

these

station,

the

level

has

to

be

reset.

no]

®

N

—

—

ae

2

c

®

E

o.

o

2%

.

nw

c

Ss

BS

1

~

a

=

oO

n

Station

Preset

tuning

(1

~

16)

(FM)

iaie

Band

selectors

Control

panel

door

release

©

Band

selectors

(band

selector)

FM:

Press

this

button

to

listen

to

an

FM

broadcast.

+25

kHz:

The

displayed

FM

frequency

can

be

shifted

by

+0.025

MHz

(+25 kHz)

in

order

to

precisely

align

with

the

frequency

of

the

FM

broadcast

station.

lf

the

FM

button

is

pressed

until

the

final

digit

of

the

frequency

display

is

a

small

“5”,

the

FM

frequency

will

shift

+0.025

MHz

(+25

kHz).

To

return

to

the

original

indication,

press

until

the

final

small

“5”

digit

disappears.

AM:

Press

this

button

to

listen

to

an

AM

broadcast.

allocation:

A

frequency

step

of

either

AM

9

kHz

or

AM

10

kHz

can

be

selected.

Set

to

the

appropriate

position

for

your

locality.

When

the

AM

button

is

pressed

slightly

longer

and

then

released

when

the

AL10”

indication

illuminates,

the

AM

frequency

“step”

will

change

to

10

kHz.

To

return

to

the

original

9

kHz,

press

the

AM

button

slightly

longer,

and

then

release

it

when

the

“AL9”

indication

illuminates.

©

Recording-level

check

button

(rec

level)

This

button

is

to

be

used

for

adjustment

of

the

recording

level

when

recording

an

FM

broadcast.

When

this

button

is

pressed,

the

microcomputer

functions

to

emit

a

reference

signal

of

precisely

333

Hz

from

the

output

terminals

of

this

unit.

The

word

“CAL”

(calibration)

and

then,

soon

thereafter,

“0.33

kHz”

will

be

shown

by

the

digital

display.

Adjustment

of

the

recording

level

Use

the

input-level

control(s)

of

the

tape

deck

to

make

the

adjustment

while

watching

the

recording-level

meters.

e

For

VU

meters

and

level

meters:

Adjust

so

that

the

indication

is

about

+2

VU

or

+2

dB.

e

For

peak-level

meters:

Adjust

so

that

the

indication

is

about

—2

dB.

Notes:

1)

Because

the

ideal

recording

level

is

apt

to

vary

depending

upon

the

program

source

and

the

characteristics

of

the

tape

deck,

the

adjustment

should

be

made

by

also

considering

those

factors.

2)

Don't

press

the

operation

buttons

of

this

unit

during

a

recording.

If

they

are

pressed,

the

recorded

soundmay

be

disturbed.

e

Rear

Panel

Control

input

terminal

Output

terminal

r—Computer

control

terminal

Voltage

selector

(AC

110/120/220/240V)

AC

inlet

(Except

[EGA,

XA]

areas)

Main

power

(Moff,

-mon)

AM

loop

antenna

terminal

AM

antenna

terminal

FM

antenna

terminal

(750,

coaxial)

m

HOW

TO

OPERATE

e

Listening

to

radio

broadcasts

Important!

This

antenna

must

be

installed

ifj

i

isteni

to

receive

AM

broadcasts.

Turn

the

amplifier

on,

and

prepare

it

for

listening

to

radio

AM

Isopcantenia

broadcasts.

Station

selection

by

using

the

tuning

buttons:

@

Press

either

“FM”

or

“AM”:

@

Press

the

left

button

to

change

the

frequency

downward,

and

press

the

right

button

to

change

the

frequency

upward.

&

Adjustment

to

FM

broadcast

signal

e

Auto

tuning

strength

is

possible

for

automatic

Press

the

button.

When

the

i

fre

indication

begi

tuning.

bes!

requency

eginsto

Press

and

hold

the

button

change,

release

the

button

(a

(Will

change

to

dB

indication

}

broadcasting

station

will

be

Release

the

button

when

the

desired

selected

automatically).

.

scan

level

indication

(30,

40

or

50

dB)

Repeat

this

operation

until

the

is

displayed

desired

station

is

found.

(When

the

scan

level

is

set,

it

will

return

e

Manual

tuning

to

frequency

display.)

Press

the

button

momentarily

wv

(the

frequency

will

change

«((

each

time

the

button

is

pressed)

and

tune

to

the

desired

station.

YS

Power:

“on”

(am

)

Technics

(uw

sytnesize

FMAM

Stereo

Tuner

87-07

;

+

stereo

quarts

oon

/FAt

mating

oft

“

He

tina

satector

|b

ae

|

FO

|

i

i

—————

|

own

wo

a

Bang

ee

mernory

C=

Station

selection

by

using

preset

tuning

buttons:

©

To

select

the

front

channels

(CH

1~8):

*°

To

select

the

back

channels

(CH

9~16):

Press

Frequency

stored

in

the

Press

momentarily.

memory

and

channel

number

slightly

longer.

are

displayed.

A

|

Frequency

stored

in

the

memory

and

channel

number

are

displayed.

e

How

to

preset

radio

broadcast

frequencies

Important!

This

antenna

must

be

installed

to

receive

AM

broadcasts.

AM

loop

antenna

e

Manual

memory

presetting

Stations

can

be

freely

preset

to

any

desired

channel.

This

unit

is

used

to

preset

as

many

as

16

radio

broadcast

frequencies:

FM/AM

random

presetting.

After

broadcast

fre-

@

Before

memory

presetting

Each

button

is

used

to

preset

two

stations.

quencies

have

been

preset

as

described

below,

any

desired

station

can

be

quickly

and

easily

selected

by

simply

touching

one

button.

Presetting

front

channels

(CH

1~8)

@

Memory

presetting

at

There

are

two

types

of

memory

presetting:

automatic

and

¢

Press

manual.

Select

whichever

is

preferred.

momentarily.

e

Automatic

memory

presetting

Beginning

at

the

frequency

indicated

by

the

digital

display,

the

FM

broadcasting

stations

and

AM

broadcasting

stations

will

be

automatically

preset

to

“channels”

1

through

16

for

FM

and

9

through

16

for

AM,

respectively.

Note

that

in

mountainous

or

remote

areas,

broadcasting

stations

which

have

weak

broadcasting

signals

cannot

be

Q

Press

the

appropriate

tuning

button

to

tune

to

the

desired

broadcast:

Presetting

back

channels

(CH

9~16)

Press

slightly

e

Auto

tuning

Press

the

button.

When

the

frequency

indication

begins

to

change,

release

the

button

(a

broadcasting

station

will

be

selected

automatically).

Repeat

this

e

Manuai

tuning

wt

Press

the

button

momentarily

and

tune

to

u(

the

desired

station

(the

frequency

will

change

each

time

the

button

is

pressed).

operation

until

the

desired

station

is

found.

Adjustment

to

FM

broadcast

signal

strength

is

possible

for

automatic

tuning.

Press

and

hold

the

button.

(Will

change

to

dB

indication.)

Release

the

buiton

when

the

desired

scan

level

indication

(30,

40

or

50

dB)

is

displayed.

(When

the

scan

level

is

set,

it

will

return

to

frequency

automatically

preset

into

the

memory.

a

Power:

“on”

(

B--m=

)

Adjustment

to

FM

broadcast

signal

strength

is

possible.

Press

and

hold

the

button.

(Will

change

to

dB

indication.)

Release

the

button

when

the

desired

scan

level

indication

(30,

40

or

50

dB)

is

displayed.

(When

the

scan

level

is

set,

it

will

return

to

frequency

display.)

A

broadcast

signal

stronger

than

the

set

level

is

memorized.

@

Press

the

“FM”

or

“AM”

button:

To

change

the

AM

frequency

by

10

kHz:

Press

the

“AM”

button

slightly

longer

and

release

the

button

when

the

“AL

10”

is

displayed.

wo

PM/AM

random

ch

preset

tuning

:

a

display.)

Power:

“on”

(

Bm

)

@

Press

the

“FM”

or

“AM”

button.

To

change

the

AM

frequency

by

10

kHz:

Press

the

“AM”

button

slightly

longer

and

release

the

button

when

the

“AL

10”

is

displayed.

Memory

indicator

|

Casein:

Syrtnemiver

FM/AM

Stereo

Tuner

8-4

ert

cK/F

MM

mang

off

ni

me

ci

Cy

-_

FM/AM

fandom

i6ch

praset

tuning

~

digest

Ate

oe

16

aid

%

=

or)

Confirm

the

names

(call

signs,

etc.)

of

the

broadcasting

stations

which

are

preset

to

each

channel,

and

enter

them

on

the

station

memory

file

sheet.

To

check

the

front

channels

(CH

1~8):

Press

Frequency

stored

in

the

momentarily.

memory

and

channel

number

ley

Press.

When

the

frequency

indication

begins

to

change,

release.

While

the

memory

indicator

is

illuminated,

press

the

button

of

the

desired

channel.

Press

momentarily,

and

then

release.

(The

memory

indicator

will

beg

are

displayed.

A

To

check

the

back

channels

(CH

9~16):

Frequency

stored

in

the

order.

Press

slightly

longer.

memory

and

channel

number

are

displayed.

(The

frequency

will

change

upward,

and

the

automatic

presetting

will

begin

with

the

broadcasting

station

of

the

lowest

frequency

and

will

continue

in

Note

that

the

channel

display

illuminates

each

time

a

broadcast

station

is

preset

in

the

memory,

thus

indicating

which

“channel”

has

been

preset.)

7

t

D2

on]

My

(4)

©

To

preset

FM

broadcasting

stations:

Set

to

87.50

MHz.

®

Topreset

AM

broadcasting

stations:

Set

to

522

kHz

(or

530

kHz).

@

Press

the

button

and

hold

slightly

(frequency

will

change

continuously).

@

Release

it

at

87.50

MHz

for

FM

or

522

kHz

(or

530

kHz)

for

AM,

and

then

press

the

button

again

momentarily

(frequency

change

will

stop).

@

Press

the

button

momentarily

(frequency

will

change

each

time

the

button

is

pressed),

and

tune

to

one

of

the

above

frequencies.

©

To

preset

channels

1

through

8:

x

Press

the

button

momentarily,

and

then

Ci

release.

(Preset

channel

number

is

displayed

on

the

channel

display.)

©

To

preset

channels

9

through

16:

-

ae

Press

the

button

slightly

longer,

and

then

release.

(Preset

channel

number

is

displayed

on

the

channel

display.)

When

the

button

is

pressed,

the

memory

indicator

illumination

will

stop,

and

the

presetting

is

complete.

Note:

1.

If

the

memory

indication

illumination

stops

before

you

press

the

button,

once

again

repeat

step

(5)

and

then

step

(6).

2.

If

a

new

broadcasting

station

is

preset

into

a

channel,

the

broadcasting

station

which

was

previously

entered

in

that

channel

will

be

automatically

erased.

illuminate

for

approximately

4

seconds.)

4

A

Note:

If

the

button

is

pressed

continuously,

the

frequency

will

begin

to

change,

and

the

memory

will

be

preset

automatically.

To

stop

the

automatic

memory

presetting,

once

again

press

either

the

“up”

button

or

the

“down”

button.

7)

Enter

the

name

(call

sign,

etc.)

of

the

preset

broad-

casting

station

on

the

station

memory

file

sheet.

This

completes

the

procedures

for

presetting

radio

broad-

cast

frequencies.

The

other

preset-tuning

butfons

can

be

preset

in

the

same

way

by

following

steps

(2)

through

(7).

ST-G7

ST-G7

m

BEFORE

REPAIR

AND

ADJUSTMENT

The

power

switch

of

this

unit

is

located

on

the

secondary

side

of

power

transformer.

So,

be

sure

to

disconnect

the

power

cord

from

the

socket

before

starting

the

repair

work.

Also,

when

repairing

the

digital

circuit,

discon-

nect

the

power

cord

and

then

short-circuit

across

the

gold

capacitors

(C920,

C921,

2.3

V

3.3F)

with

a

resistor

(10

ohms,

about

1

W)

to

discharge

the

voltage.

m

DISASSEMBLY

INSTRUCTIONS

ee]

How

to

remove

the

cabinet

|

How

to

remove

the

bottom

board

Procedure

2

@

Remove

the

11

setscrews.

(Q@~

@)

Front

pane}

Cabinet

Rear

panel

1.

Pull

out

the

5

connectors.

(J8,

J9,

J11

and

2

lamp

con-

nectors)

2.

Remove

the

7

setscrews.

(Q@~

@)

3

Procedure

1=3

Connector

terminals

(J8,

J9,

J11)

as

viewed

from

above

with

cabinet

removed,

Lamp

connectors

for

LCD

J11\,

3g

|

\

\

im)

9

A

ay

7)

Front

panel

Bottom

board

@

Remove

the

8

setscrews.

(Q@~

@)

ae

No.

How

to

remove

the

sub

panel

Procedure

1=>3=p4

1.

Remove

the

2

setscrews.

(@,

@)

2.

Remove

the

lamp

case

and

liquid

crystal

panel

P.C.B.

Front

panel

Liquid

crystal

panel

P.C.B.

:

Z

|

Liquid

crystal!

|

panel

P.C.B.

Procedure

1939495

1.

Remove

the

ornament.

2.

Remove

the

4

setscrews.

(Q@~

@)

3.

Remove

the

3

setscrews.

(@

~

@)

Switch

P.C.B.

Selector

button

Ref.

No.

6

How

to

remove

the

LCD

panel

@

Remove

the

1

setscrew.

(@)

Procedure

1—>3m>6

1,

Remove

the

2

setscrews

(@

,@)

3)

LCD

panel

receptacle

2.

Remove

the

lamp

case

and

liquid

crystal

panel

P.C.B.

Filter

Front

panel

Bracket

Lamp

a

Oe

ay

Liquid

crystal

panel

P.C.B.

@

Remove

the

diffusion

plate

and

liquid

crystal

panel

ins

How

to

remove

the

glass

door

P.C.B.

from

the

LCD

panel

receptacle.

Flat-head

screwdriver

LCD

panel

Procedure

a

LCD

panel

1.

Remove

the

4

setscrews.

(@~@)

receptacle

1=> 3

=>7

conalive

rubber

2.

Turn

the

glass

door

hinge

counter-

clockwise

((

).

3.

When

disassembling

or

assembling

the

movable

bodies

A

&

B,

apply

GREASE

6

to

the

parts

shown

in

@

~@.

Liquid

crystal

panei

P.C,B,

Conductive

rubber

Diffusion

plate

Front

panel

Caution:

Never

touch

the

LCD

panel,

electrode,

conductive

rubber

and

liquid

crystal

panel

P.C.B.

electrode

with

bare

hand.

(Movable

body

8)

@

Apply

GREASE

6

to

these

parts.

@

Apply

GREASE

6

to

these

parts.

m

HOW

TO

USE

THE

AM

LOOP

ANTENNA

Find

the

best

reception

position

for

the

FM

antenna,

and

then

fix

2.

When

attaching

the

antenna

to

the

rack.

it

in

place

ona

wail,

the

rack,

or

the

unit.

AM

antenna

holder

(A)

(included)

Pay

attention

to

the

following

points

when

attaching

the

antenna.

1)

Find

the

height

and

direction

of

the

antenna

where

reception

is

best

and

then

fix

it

vertically

to

the

wail,

rack,

etc.

2)Do

not

attach

it

horizontally

(to

do

so

would

impair

reception).

3)

Do

not

attach

it

close

to

meta!

surfaces,

power

cords,

or

speaker

wires

(to

do

so

would

result

in

noise).

4)

Do

not

attach

it

close

to

a

tape

deck

(when

the

tape

deck

is

being

used,

chirping

or

beeping

sounds

may

be

received).

3.

When

attaching

the

antenna

to

the

unit.

AM

antenna

holder

(B)

(included)

a

CK

Rear

panel

AM

loop

antenna

1.

When

attaching

the

antenna

to

a

wall,

column.

of

the

unit

<~

(included)

AM

loop

antenna

(included)

4.

If

a

hook

is

used

(if

the

holder

can’t

be

attached

by

screws)

Hook

(option)

AM

antenna

holder

(A)

(included)

AM

loop

antenna

(included)

m

MEASUREMENTS

AND

ADJUSTMENTS

AM

ADJUSTMENT

*

Setting

and

Equipment

used

1.

ACelectronic

voltmeters

(EVM).

5.

Output

of

signal

generator

should

be

no

higher

than

necessary.

2.

AMsignal

generator

(AM-SG).

to

obtain

an

output

reading.

3.

Set

Band

selector

to

‘AM

(allocation

9

kHz)’’

position.

6.

Use

a

non-metal

screwdriver

for

the

adjustment.

4.

Maintain

line

voltage

at

rated

voltage.

AM

SIGNAL

GENERATOR

DISPLAY

FREQUENCY

PREPARATIONS

PARTS

ADJUSTED

ADJUSTING

PR

OCEDURE

CONNECTION

FREQUENCY

Step

No.

AM-IF

ADJUSTMENT

Connect

AM-SG

to

AM

antenna

terminal

*

Adjust

the

input

frequency

through

200pF

aoe

is

Prequeniey

of

|

Connect

AC

EVM

or

T7201

(AM

1

st

IFT)

and

adjustment

points

so

:

%

Mod,

non-inter-

scope

to

“OUTPUT

capacitor.

Common

to

with

400

Hz)

ference

terminals

that

the

output

becomes

1

chassis.

(Powerful

input)

:

maximum,

(Refer

to

Fig.

1)

AM-RF

ADJUSTMENT

|

Except

[XA]

area

522

kHz

eating

[XA]

Connect

AC

EVM

or

1.

Adjust

for

max

imum

output,

2

[XA]

area

522

kHz

scope

to

“OUTPUT”

L203

(ANT

Coil)

2.

Adjust

core

of

L203

by

531

kHz

terminals.

screwdriver.

(30%

Mod,

Lees

Connect

AM-SG

to

with

400

Hz)

|

991

zl

i

oeoeee

612

kHz

Connect

AC

EVM

or

1,

Adjust

for

max

imum

output.

3

eapscny

Caomimon'to

(30%

Mod.

612

kHz

scope

to

“OUTPUT”

L202

(ANT

Coil)

2.

Adjust

core

of

L202

by

chassis

(Weak

input)

with

400

Hz)

terminals.

screwdriver,

(Refer

to

Fig.

1)

1.

Adjust

for

max

imum

output.

1503

kHz

Connect

AC

EVM

or

cT201

2,

Repeat

steps

(2,

3)

and

(4)

4

(30%

Mod.

1503

kHz

scope

to

“OUTPUT”

(ANT

Trimmer)

until

the

frequency

correctly

with

400

Hz)

terminals.

matches

the

frequency

display.

adjustment.

[FM

ADJUSTMENT

*

Setting

and

Equipment

used.

*

Preparation

of

FM

signal

generator

(FM-SG)

1.

FM

signal

generator

(FM-SG),

1.

The

standard

input

of

the

set

is

60

dB

(1

mV),

400

Hz,

100%

2.

Distortion

analyser.

modulation

(Because

of

attenuation,

using

coaxial

cables,

SG

3.

Oscilloscope

output

must

be

6

GB

plus,

That

is,

when

input

60

dB

SG

4.

AC

and

DC

electronic

voltmeters

(EVM).

output

is

to

be

66

dB.)

5.

Frequency

counter

(19

kHz

and 108

MHz

measurable).

6.

Set

band

selector

to

‘‘FM"

position.

7.

Set

FM

mode

selector

to

““mono”

position.

*

When

the

frequency

is

changed,

muting

is

automatically

turned

on.

8.

Other

setting

are

the

same

as

in

AM

adjustment.

So,

be

sure

to

turn

it

off

by

the

FM

muting

off/scan

level

selector

switch,

9.

Set

IF

band

selector

to:

‘‘normal”

position.

Also,

make

sure

that

the

FM

IF

band

is

at

“‘normal’’.

=

FM

SIGNAL

GENERATOR

DISPLAY

PREPARATIONS

PARTS

ADJUSTED

ADJUSTING

PROCEDURE

CONNECTION

FREQUENCY

|

FREQUENCY

rbd

FM

MONO

DISTORTION

ADJUSTMENT

100.10

MHz

Connect

DC

VEM

1.

Adjust

T101

core

so

that

m

between

PGA

and

set

tile

voltage

measured

in

signal

5

pirates

100.10

MHz

through

choke

T101

{Discri.

IFT)

mode

is

0

mV

in

300

mV

wilt

#

coil.

(Refer

to

Fig.

2)

range.

Connect

FM-SG

to

100.10

MHz

i

|

Connect

AC

EVM

1.

Adjust

for

maximum

output.

,

a

:

Bi)

martene

carried.

Oe

Me

|

doasianare:

«|

Poteet

MMMM

2m

Irie

Sea

fray

|

abet

care

ch

102

ty

antenna

terminal.)

(Refer

to

Fig.

3)

Connect

DC

VEM

1.

Adjust

VR102

so

that

100.10

MHz

VR102

:

7

(0%

Mod.

100.10

MHz__|

Petween

(Pulse

count

duty

voltage

measured

in

with

400

Hz)

and

ground,

adj.)

signal

mode

isO

mV

in

(Refer

to

Fig,

4.)

J.

300

mV

range.

Short-circuit

between

MGW

and

by

jumper

wire

only

during

FM-RF

adjustment,

FM-RF

ADJUSTMENT

and

be

sure

to

open

the

circuit

during

adjustment

other

than

FM-RF.

1,

Scat

sc

Rey

5

EGET

and

bE

by

Seem,

|

areata

brow

ve

Bos

8

referririg

to’

Eid:

5

(100%

Mod,

87.50

MHz

2.

Connect

DC

EVM

L6

(OSC

Coil)

reading

on

DC

EVM.

19

g.

©.

with

400

Hz)

between

fiGAI

(+)

(Weak

input)

and

Ground.

LIOANT

Coil}

|

1+

Adel

woak

input

ee

that

90.10

MHz

L1

(ANT

Coil

cm

|

(100%

Mod.

|

90.10MHz

|

sgcyepysrserminals,

|

L3.

(ANT

Coil)

apd

auicald

acl

g

|

Connect

FM-SG

to

with

400

Hz)

erminals.

|

1a

(ANT

Coil)

2.

Make

the

adjustment

so

that

antenna

terminal

T1

(FM

1st

IFT)

the

output

wave

form

is

ver-

referring

to

Fig.

6.

tically

symmetrical.

(Fig.

7).

(Weak

input)

Tea

+

3.

Hepes!

ihestps

(8),

(9}

and

:

2

10)

until

the

frequency

cor-

10

(100%

Mod.

106.10

MHz

Tent

ea

CT1

(OSC

Trimmer)

rectly

matches

the

frequency

with

400

Hz)

‘

display.

PILOT

CANCEL

ADJUSTMENT

Connect

FM-SG

to

FM

antenna

terminal

100.10

MHz

: :

Make

the

adjustments

so

that

‘ :

Connect

scope

L301

(Pilot

filter)

F

11

referring

to

Fig.

8.

(0%

Mod.

:

the

output

waveform

is

(Apply

60

dB

to

with

400

Hz)

100.10

MHz

between

and

VR103

(Pilot

Cancel)

|

i

pelscring

se

antenna

terminal.)

(L+R)

Ground.

Fig.

9.

(Pilot

10%

Mod.

stereo

signal.)

L

ess

+

STEREO

DISTORTION

ADJUSTMENT

Connect

FM-SG

to

T

FM

antenna

terminal

100.10

MHz

Connect

distortion

refferring

to

Fig.

10.

(90%

Mod

analyser

to

“OUTPUT”

FE

Adjust

T1

and

T103

core

so

that

12

(Apply

60

dB

to

ith

ps

Hj

)

100.10

MHz

terminals

of

the

set

EM

clea

distortion

of

right

and

left

antenna

terminal.)

iL

or

R

mites

through

low-pass

filter.

7

channels

are

minimized.

(Pilot

10%

Mod.

(fc

=

15

kHz~19

kHz)

stereo

signal.)

ST-G7 ST-G7

Note:

FM

IFT

(2nd)

[T102],

FM

2

nd

IF

filter

[T104,

T105]

and

FM

DET

filter

[L302,

L303]

have

been

already

adjusted,

and

require

no

FM

SIGNAL

GENERATOR

:

EHeQUENCcY

|

PREPARATIONS

||

PARTS

ADJUSTED

|

ADJUSTING

PROCEDURE

2.3.

CONNECTION

FREQUENCY

FM

Signal

gene

tep

=

No.

SEPARATION

ADJUSTMENT

KS

Connect

EM-SG

to

1.

Adjust

VR303

so

that

R

:

output

is

minimized

when

(750)

Bete

aay

100.10

MHz

Sd

eac

ta

sede

stereo

modulator

is

in

L

e

OO

pone

(90%

Mod.

VR303,

VR304

(L

ch.

modulation)

mode,

13

{Apply

60

dB

to

antenna

f

100.10

MHz

of

the

set

through

: °

ermine

with

1

kHz)

lowe-bese

titer

(Separation)

2.

Adjust

VR304

so

that

L

(Pilot

10%

Mod

Reta

rupae!

(fo

=

15

kHz

~19

kHz)

SutoMs

etnies

Wien

stereo

signal.)

stereo

modulator

is

in

:

R

(R

ch

modulation)

mode.

SIGNAL

STRENGTH

LEVEL

ADJUSTMENT

1

1.

Change

LCD

display

from

.

ee

frequency

to

dB

by

pressing

onnect

-SG

to

the

FM

signal

button,

:

FM

antenna

terminal.

100.10

MHz

VR101

2.

Adjust

VR101

so

that

50

dB

FM

Signal

gener

14

(Apply

50

dB

to

(30%

Mod,

100.10

MHz

(Signal

strength

<

indicated

antenna

terminal.)

with

400

Hz)

level)

3.

Make

sure

that

the

signal

bh

strength

level

is

22

~

38

dB

when

the

input

is

30

dB.

(750)

ff

e

OO

e

Adjustment

points

612

kHz

1503

kHz

19

kHz

R—-L

L-R

FM

AM

ANT

AM

ANT

Filter

separation

separation

discri.

IFT

coil

trimmer

FM

Signal

gene

L301]

R304]

[VR303]

Computer

Control

Output

|

AM

ANT

control

input

terminal),

"

EXT

AC

inlet

terminal

terminal

——,

{|

Loop

L302

NO

ADJUSTMENT

L303

NO

ADJUSTMENT

ADJUSTMENT

T1085

NO

TPI03

Ground

point

450

kHz

FM

ANT

(75Q)

[vRI03

[ti03]

[vrioi}]

[t2o]

[ctr]

19

kHz

Pulse

count

FM

IFT

Signal

strength

AMIFT

FM

1st

FM

1

st

cancel

adj.

duty

adj.

(3

rd)

level

adj.

(1

st)

Osc.

OSC

coil

trimmer

AM

Signal

generator

(AM-SG)

r

oO

O'

0

°

OC

AM

antenna

terminal

7

Output

aad

terminal

Capacitor

(200pF)

[Fig.

1]

[Abb.

1]

Oscilloscope

me

FM

ANT

@

S

coil

{

L10

|

‘iz

|

|

AM

RF

coil

L203}

522kHz

FM

ANT

coil

T

coil

T

coil

FM

Signal

gener:

BR

'

adjusted,

and

require

no

|,

400

Hz,

100%

axial

cables.

SG

t60dB

SG

omatically

turned

on.

ff/scan

level

selector

switch.

ormal’’.

\DJUSTING

PROCEDURE

Adjust

T101

core

so

that

voltage

measured

in

signal

mode

is

O

mV

in

300

mV

range.

Adjust

for

maximum

output.

Adjust

core

of

T103

by

screwdriver.

Adjust

VR102

so

that

voltage

measured

in

signal

mode

is

O

mV

in

300

mV

range.

Adjust

L6

for

3.0V

reading

on

DC

EVM.

Add

weak

input

so

that

noise

is

included

in

the

output

wave

form,

Make

the

adjustment

so

that

the

output

wave

form

is

ver-

tically

symmetrical.

(Fig.

7).

Repeat

the

steps

(8),

(9)

and

(10)

until

the

frequency

cor-

rectly

matches

the

frequency

display.

ike

the

adjustments

so

that

>

output

waveform

is

nimum

referring

to

y.

9,

just

T1

and

T103

core

so

that

tortion

of

right

and

left

annels

are

minimized,

Step

No.

13

14

Control

Output

|

AM

ANT

/FM

ANT

input

terminal

Loop

EXT

(75)

terminal

-—

—

=

FM

ANT

@

S

coil

a

mzsr|

|

AM

RF

coil

L302

NO

ADJUSTMENT

Oa

lak

L203]

522kHz

Z)

L303

NO

FM

ANT

coil

ADJUSTMENT

Computer

control

AC

inlet

terminal

T105

NO

ADJUSTMENT

ADJUSTMENT

Mae

Ground

point

450

kHz

|

T201

19

kHz

Pulse

count

FM

IFT

Signal

strength

AM

IFT

FM

1

st

FM

1

st

cancel

adj,

duty

adj.

(3rd)

level

adj.

(1

st)

OSC.

OSC

coil

trimmer

AM

Signal

generator

(AM-SG)

Oscilloscope

AM

antenna

terminal

¢

Output

oe

terminal

Capacitor

{200pF)

[Fig.

1]

[Abb.

1]

DC

EVM

i

FM

SIGNAL

GENERATOR

DISPLAY

Cc

Oscilloscope

FREQUENCY

PREPARATIONS

PARTS

ADJUSTED

ADJUSTING

PROCEDURE

—

CONNECTION

FREQUENCY

FM

Signal

generator

(FM-SG)

“6

ae

SEPARATION

ADJUSTMENT

TEK

I

=

1.

Adjust

VR303

so

that

R

Connect

FM-SG

to

te

Te

at

ae

|

FM

antenna

terminal

Connect

AC

EVM

to

output

is

minimized

when

i730)

:

:

100.10

MHz

i

i

:

stereo

modulator

is

in

L

referring

to

Fig.

11.

(90%

Mod.

erat

Pit

oe

ena

u

G04

(L

ch.

modulation)

mode.

(Apply

Poe

RMEPNE

|

nthe

KHz)

Pa

ee

(Separation)

2.

Adjust

VR304

so

that

L

4-68

sees

tees

oe

Mod.

(L

or

R

mode)

(fe

=

15

kHz

~19

kHz}

ee

FEM

antenna

_(SLOx10!-20)

FM

antenna

terminal

(750)

stereo

signal.)

R

(R

ch

modulation)

mode

terminal

(750)

Fig.

3

Abb.

3

as

ls

:

[Fig.

2]

[Abb.

2]

[Fig.

3]

[ ]

SIGNAL

STRENGTH

LEVEL

ADJUSTMENT

1.

Change

LCD

display

from

DC

EVM

frequency

to

dB

by

pressing

pra

Connect

FM-SG

to

the

FM

signal

button.

.

EM

antenna

terminal.

aaa

ree

i

cee

2.

Adjust

VR101

so

that

50dB|

FM

Signal

generator

(FM-SG)

FM

Signal

generator

(FM-SG)

(Apply

0

dB

to

oa

aed

Hz)

3

‘eet

g

is

indicated.

©

antenna

terminal.)

3.

Make

sure

that

the

signal

strength

level

is

22

~

38

dB

TP302

&

ee

ee

|

ees

when

the

input

is

30

dB.

Z

Ground

Ground

‘eae

eee

FM

antenna

terminal

(75)

on

antenna

terminal

Q)

Adjustment

points

[Fig.

4]

[Abb.

4]

612

kHz

1503

kHz

{Fig.5]

[Abb.

5]

19

kHz

R-L

L-—R

FM

AM

ANT

AM

ANT

Filter

separation

separation

discri.

IFT

coil

trimmer

FM

Signal

generator

(FM-SG)

.

Noise

Tior

|

L202]

[er201

Oscilloscope

kar

ee

Output

goo

dO:

terminal

FM

antnna

terminal

(752)

[Fig.

6]

[Abb.

6]

Noise

AF

output

wave

form

[Fig.

7]

[Abb.

7]

Oscilloscope

FM

Signal

generator

(FM-SG)

pee

agett

[Fig.

9]

[Abb.

9]

FM

antenna

terminal

(750)

[Fig.

8]

[Abb.

8]

FM

Signal

generator

(FM-SG)

Distortion

analyser

Output

B

O°

OD

terminal

FM

antenna

terminal

(752)

[Fig.

10]

[Abb.

10]

Low

pass

filter

FM

Signal

generator

(FM-SG)

ACEVM

ACEVM

FM

antenna

terminal

(7522)

[Fig.

11]

[Abb.

11]