Panasonic Technics SA-800 Manuale utente

ORDER

NO.

$D7804-1349

Service

Manual

FM/AM

STEREO

RECEIVER

7

SA-800

(FE),

(ES)

-800

*

The

model

SA-800

(FE)

is

availabie

in

far

East

PX

only

*

The

model

SA-800

(ES)

is

available

in

European

Militaly

_-.wiue

Manual

for

Model

No.

SA-800

(M,

MC).

For

additional

information,

please

refer

to

Notes:

*

This

service

manual

included

only

the

change

of

the

SA-800

(M,

MC)

service

manual

(ORDER

NO.

SD7801-1295).

*

When

servicing

model

SA-800

(FE,

ES),

this

service

manual

and

SA-800

(M,

MC)

(ORDER

NO.

SD7801-1295)

service

manual

should

be

used

together.

m=

SUPPLEMENTARY

OPERATION

RECORDING/PLAYBACK(DIN)

SOCKET

VOLTAGE

ADJUSTER

@

TECHNICAL

SPECIFICATIONS

SA-800

(M),

(MC)

SA-800

(FE),

(ES)

PHONO

—_2.5mV/47

kilohms

Poe

On

ents

a

AUX

150mV/47

kilohms

mags

Lop

er

Rens

Input

sensitivity

PLAYBACK

(TAPE

1,

2)

«

PLAYBACK

(TAPE

1)

180mV/47

kilohms

and

impedance

150mV/47

kilos

PLAYBACK

(TAPE

2)

150mV/47

kilohms

REC/PLAY

180mV/47

kilohms

one

PRE

OUT

PRE

OUT

rated

1V,

maximum

3V

rated

1V,

maximum

3V

REC

OUT

(TAPE

1,

2)

150mV

REC

OUT

(TAPE

1,2)

150mvV

REC/PLAY

30mV

Output

voltage

Power

consumption

330W

(only

for

America)

600VA

(only

for

Canada)

oa

AC

120V

(60

Hz)

AC

110V/120V/220V/240V

(50/60Hz)

Power

supply

Ti

e

Panasonic

Tokyo

Matsushita

Electric

Trading

Co.,

Ltd.

Matsushita

Electric

Trading

Co.,

Ltd.

17-15,

6-chome,

Shinbashi,

Minato-ku,

Tokyo

105

Japan

P.O.Box

288,

Central

Osaka

Japan

byPanasonic

SA-800

m

REPLACEMENT

PARTS

LIST

Change

of

Part

No.

|

Remarks

$A-300

>

Ae

Part

Name

&

Description

netuerks

(M),

(MC)

(FE),

(ES)

TRANSISTORS

TR501,502

|

2SA720-R

|

2SA902S-F

[AF

Amplifier

(Use

in

ranks

ForG)

@|

2

TRANSFORMER

SLT5R29

|

SLT5S25

[

Transformer,

Power

Source

RESISTORS

R533,

534

ERD28TJ102

ERO25CKF2201_

|

Metallic,

2.2kQ,

1/4W,

+1%

ERD251J274

Carbon,

270k,

1/4W,

+5%

ERD25TJ184

ERD25TJ683

Carbon,

68k,

1/4W,

+5%

ERD25TJ124

ERD25TJ823

Carbon,

82kQ,,

1/4W,

+5%

R613,

614

ERD25TJ183

ERD25TJ562

Carbon,

5.6k2,

1/4W,

+5%

R702

ERD18FAJ2R2

Deletion

R1001,

1002

=

ERD25TJ394

Carbon,

390k,

1/4W,

+5%

R1003,

1004

-

|

_ERD25TJ104

Carbon,

100k,

1/4W,

+5%

R1005

~

1008

=

[

_ERD25TJ472

Carbon,

4.7kQ,

1/4W,

+5%

CAPACITORS

NEM

TN

C521,

522

ECEASOMR68R

ECEASOM4A7R

|

Electrolytic,

4.7¢F,

50V

C551,

552

ECEASOM1R

ECEA50M4R7R

Electrolytic,

4.7KF,

50V

C607,

608

ECCD2HO70D

ECCD2H120K

Ceramic,

12pF,

500V,

+10%

C613,

614

ECCD2H820K

Ceramic,

82pF,

500V,

+

10%

ECCD1H100K

ECQU1A103MD

M

C1002,

1003

”

ECQU1A103MD

Polyester,

0.01K#F,

125VAC,

+20%

ECQU1A103MC

(MC)

XBA1F80NU14

XBA2E80NS5

Fuse,

8A

(250V)

Fe

te

F2

XBA1F20NU14

XBA1E20NS5

Fuse,

2A

(125V)

ee

|

F3

XBA1F16NU14

XBA1E16NS5

Fuse,

1.6A

(125V)

F4

-

XBA2E40NS5

Fuse,

4A

(250V)

SWITCHES

SSL15

|

Switch,

Power

Source

SSR53S

Switch,

Voltage

Adjuster

CABINET

and

CHASSIS

PARTS

SGP1110A

|

SGP1110B

RJA10A

SJA83

AC

Cord

RJS31-1

Socket,

DIN

(Tape

REC/PLAY)

XWC3BFZ

Washer

XTB3+8BFZ

Screw,

DIN

Socket

M'tg

XSB3+6BFZ

Screw,

Voltage

Adjuster

Switch

M'tg

»

ACCESSORIES

RJP74-1

Piug

Adapter,

Power

Source

RJP75

Plug

Adapter,

Power

Source

PACKING

PARTS

SGP1110-1A

Rear

Panel

SPS1387

SPS1385

SPS1383

SPS1381

SPG1345

SPG1347

SQF1755

SQF1757

SPS1521

Pad,

Right

Side

SPS1519

Pad,

Left

Side

SPG1377

Carton

Box

SQF1831

Instructions

Book,

Printed

Matter

m

EXPLODED

VIEWS

XTN3+8BFZ

‘§7)SJV1401-1

ee

§4)

SHO3X1F

Part

No.

GOR

XSB3+6BFZ

J

aad

oe

RJS31-1

g

co

QBSIAB3

|

HR1i1

Bar

Antenna

Mounting

(With

Bar

Antenna)

i

SJSA66-1

Bar

Antenna(L201)

C2

ain

Vi

Bar

Antenna

Mounting

2

(With

Bar

Antenna)

XSN3+14BNS

67)SJF8003

Part

Name

&

Description

XWC3BFZ

SNE55

XTN3+8B

SHD3XIF

SDR1

SMM23

SJV1401-1

XWA3BFN

XSN3+14BNS

SJF4411

SJF4411-1

SJF3421

SIF

3223

SDZ051-2

SDSA4121

SDD53

SJF8003

SGP1110-1A

XTN3+8BFZ

SHR401-1

XCJ6P21B

SJSA66-1

RHR111

SJA83

SBM41

SBM9007

SJP9205-1

SGX763

SHP641

SJP9205-1

RJS31-1

XWC3BFZ

XTB3+8BFZ

XSB3+6BFZ

Washer,

Fuse

Circuit

Board

Screw

Lug,

Ground

Screw,

Meter

Bracket

M’tg

Shaft,

Pulley

Pulley,

Dial

Bracket,

Meter

Socket,

Power

Transistors

Washer,

Power

Transistors

Screw

Screw,

Power

Transistors

M’tg

Terminal,

Speakers

(Left)

Terminal,

Speakers

(Right)

Terminla,

Pre

Out-Main

In

Terminal,

4CH

Max

Out

and

AM

Stereo

Out

Cord,

Dial

86-9/16"

(220cm)

Spring,

Dial

Cord

Drum,

Dial

Cord

Terminal,

Input

and

Antenna

Rear

Panel

Screw,

Terminal

and

Rear

Panel

M‘tg

Lock

Pin,

Terminal

M’tg

Jack,

Headphones

Socket,

AC

Outlet

Bushing,

AC

Cord

AC

Cord

Magnet,

Relay

Bracket,

Magnet

Short

pin,

Pre

&

Main

Amp

Connection

Mirror,

Dial

Scate

Shading,

Cloth

Short

Pin,

Pre

&

Main

Amplifier

Socket,

DIN

(Tape

REC/PLAY)

Washer

Screw,

DIN

Socket

M‘tg

Screw,

Voltage

Adjuster

M'tg

SHR401-1

XTN34+8BFZ

69

XTN3

+

8BFZ

68)

SGP1110-1A

Per

set

|

[

BOP

WW

2

BaNougsooaa

NNNANWSENANH=

SA-800

m

SCHEMATIC

DIAGRAMS

@

Power

source

f

UNSWITCHED

AC

LINE

"|

Cd

120

(60Hz)

S16

—_o-—-B-

C1003

0,01

/

R702,

F3

1.64

6

C1002

0,01

SWITCHED

7

S18-1,S18-2

|

Voltage

adjuster

switch

in

“110”

position,

@110V-+@

120V-+@

220V-"@

240V

C1003

0.01

AC

LINE

110/

120/220/240V

(50/60Hz

)

£1008

00!

SWITCHED

UNSWITCHED

AC

OUTLETS

REC

OUT

R1007

47K

“PLAY

BACK

Wv

-REC

OUT

7

PLAY

BACK

5

-REC

OUT

Ri008

47K

'~PLAYBACK

(O

>-REC

OUT

TAPE

2

—PLAYBACK

(O

REC/PLAY

R1005

47K

@

Tape

deck

connection

terminal

p-REC

OUT

“PLAYBACK

REC

OUT

LPLAYBACK

(Q-——-___5

change

REC

OUT

PLAYBACK

REC

OUT

“PLAYBACK

R1003

100K

Printed

in

Japan

[4]

78040560

@

ORDER

NO.

SD7801-1295

Service

Manual

FM/AM

STEREO

RECEIVER

SA-800

(M),

(MC)

e

The

model

SA-800

(M)

is

available

in

America

only.

e

The

model

SA-800

(MC)

is

available

in

Canada

only.

Simulated

wood

cabinet

TECHNICAL

SPECIFICATIONS

(Specifications

are

subject

to

change

without

notice

for

further

improvement.)

POWER

AMPLIFIER

SECTION

Rated

minimum

sine

wave

RMS

power

output

20Hz

~

20kHz

both

channels

driven

0.04%

total

harmonic

distortion

125W

per

channel

(8

ohms

and

4

ohms)

1kHz

continuous

power

output

both

channels

driven

0.04%

total

harmonic

distortion

Output

voltage

PRE

OUT

REC

OUT

(TAPE1,

2)

Acoustic

controls

(at

tone

“0”

position)

LOW

boost

HIGH

boost

FM

TUNER

SECTION

Frequency

range

Sensitivity

rated

1V,

maximum

3V

150mV

100Hz,

+6dB

10kHz,

+6dB

88

~108MHz

10.3dBf

Technics

135W

per

channel

(8

ohms

and

4

ohms)

Total

harmonic

distortion

0.04%

at

rated

power

(20Hz

~

20kHz),

8

ohms

and

4

ohms

0.015%

at

half

power

(20Hz

~

20kHz),

8

ohms

0.025%

at

half

power

(20Hz

~

20kHz),

4

ohms

0.005%

at

half

power

(1kHz),

8

ohms

and

4

ohms

intermodulation

distortion

0.04%

SHz

~

90kHz,

“dB

112dB

0.4mV

50

(8

ohms),

25

(4

ohms)

1V/100

kilohms

4 ~

16

ohms

8

~

16

ohms

Frequency

response

S/N

(IHF,

A)

Residual!

hum

and

noise

Damping

factor

Input

sensitivity

and

impedance

Load

impedance

MAIN

or

REMOTE

MAIN

+

REMOTE

PREAMPLIFIER

SECTION

input

sensitivity

and

impedance

PHONO

AUX

PLAYBACK

(TAPE

1,

2}

PHONO

maximum

input

voltage

(1kHz,

RMS)

S/N

(IHF,

A)

PHONO

AUX

Frequency

response

PHONO

AUX

2.5mV

/47

kilohms

150mV/47

kilohms

150mV/47

kilohms

200mV

83dB

97dB

RIAA

standard

curve

+0.2dB

+0

20Hz

~

20k

Hz,_

9308

+0,

_798

10Hz

~

40

kHz,

Tone

controls

BASS

MIDDLE

TREBLE

Loudness

control

(volume

at

—30dB)

High

filter

Low

filter

Muting

50Hz,

+12dB

~

—12dB

1kHz,+7dB

~—7dB

20k

Hz,

+12dB

~

—12dB

50Hz,

+9dB

7kHz,

—6dB/oct.

100Hz,

—6dB/oct.

—20dB

Panasonic

Company

Corporation

of

America

One

Panasonic

Way,

Secaucus,

by

Panasonic

New

Jersey

07094

Division

of

Matsushita

Electric

320

Waiakamilo

Road,

Honolulu,

Hawaii

96817

1.8uV

(IH

F

‘58)

50

dB

quieting

sensitivity

MONO

STEREO

Total

harmonic

distortion

MONO

STEREO

S/N

MONO

STEREO

Frequency

response

13.2dBf,

(2.5uV

'H

F

58)

36.2dBf,

(35.4yV

iH

F

‘58)

100Hz

0.15%,

1kHz

0.1%,

6KHz 0.3%

100Hz

0.3%.

1kHz

0.2%.

6kHz

0.4%

7748

73dB

20Hz

~

18kHz,

*

0-208

80dB

1.00B

85dB

40008

400dB

60dB

Alternate

channel

selectivity

Capture

ratio

Image

rejection

at

98MHz

{F

rejection

at

9SMHz

Spurious

response

rejection

at

9IIMHz

AM

suppression

Stereo

separation

1kHz

10kHz

Leak

carrier

Antenna

terminals

45dB

35dB

—70

dB

(19kHz),

-50

dB(38kHz)

30),

750

AM

TUNER

SECTION

525

~

BOSkHz

30uV,

SOKV/m

35dB

50dB

45dB

Frequency

range

Sensitivity

Selectivity

Image

rejection

at

1000

kHz

IF

rejection

at

1000

kHz

GENERAL

Power

consumption

330W

(only

for

&m

erica)

600VA

(only

forCa

nada)

AC

12(V

60Hz

222%"

x

B4"x

155%"

(582

x

177

x

193)mm

41.9

tk

(

19kg)

Power

supply

Dimensions

(W

x

H

x

D)

Weight

Weights

and

dimensions

shown

are

approximate.

Matsushita

Electric

of

Hawaii,

Inc.

Matsushita

Electric

¢

Ccanada

Ltd.

40

Ronson

Drive,

Redale,

Ontario,

Canada

MYWV

1B5

m

LOCATION

OF

CONTROLS

POWER

DISPLAY

RANGE

(

a=

XO.1

Mi

X1)

POWER

DISPLAY

(=

OFF

MLON)

FM

MPX

FILTER

(1

OUT

=

INCREC

))

FM

HI-BLEND

(

f

OFF

.=

ON)

SIGNAL

STRENGTH

METER

FM

TUNING

METER

ey

a

et

(AM/FM

AUTO/PHONO/AUX)

TAPE

MONITOR

(TAPE

1/SOURCE/TAPE

2)

REC

MODE

(TAPE

1»2/SOURCE/TAPE

2»

1)

FM

MUTING

(ON/OFF)

(BOOST/OFF/FILTER)

LOW

MODE

(STEREO/MONO)

(BOOST/OFF/FILTER)

HIGH

(OFF/ON)

ACOUSTIC

CONTROL

(0dB/—20dB)

AUDIO

MUTING

BALANCE

LOUDNESS

(OFF/ON)

POWER

LEVEL

INDICATOR

LEFT

RIGHT

.

AM

BAR

ANTENNA

PRE

AMP

OUTPUT

MAIN

AMP

INPUT

AC

OUTLETS

AM

STEREO

OUT

4CH

MPX

OUTPUT

AM

ANTENNA

FM

ANTENNA

(75Q)

MAIN

Es

SPEAKER

REMOTE

©

SPEAKER

PLAYBACK

REC

OUT

FM

ANTENNA

(3009)

TAPE

DECK

1

GROUND

PHONO

INPUT

PLAYBACK

TAPE

DECK

2

AUX

INPUT

REC

OUT

SA-800

POWER

AMP

DRIVE/PROTECTION

CIRCUIT

POWER

TRANSISTORS

TRANSFORMER

TAP

SELECTION

CIRCUIT

&

FUSES

FM

RF

CIRCUIT

VARIABLE

CAPACITOR

FM

IF

AMP/AM

CONV.

RELAY

(PROTECTION/

FM

IF

AMP

FM

MPX

LOGARITHM

MPX

FILTER

COMPRESSOR

CIRCUIT

TECHNICAL

GUIDE

™@

AUTOMATIC

SELECTION

CIRCUITRY

FOR

MAIN

AMPLIFIER

POWER

VOLTAGE.

(TRANSFORMER

COIL

TAP)

This

circuitry

functions

to

maintain

the

main

amplifier

in

a

stabilized

operating

condition

by

detecting

the

DC

resistance

of

the

speakers

connected

to

this

unit,

and

then

making

the

changeover

to

the

high-voltage

power

trans-

former

coil

tap

if

the

load

is

80

or

more,

or

to

the

low-voltage

tap

if

the

load

is

61

or

less.

MAIN

(SPEAKER)

AC

120V

o—{1)

REMOTE

|

{

—¢-0--0—{R)

MAIN

i

(SPEAKER)

|

ro

SPEAKER

DC

RESISTANCE

o—(R)

REMOTE

DETECTION

CIRCUIT

|

i

|

RELAY DRIVE

CIRCUITRY

BY

|

I

|

D903

Fig.

1

Operation

principles

1.

If

speakers

with

an

impedance

of

62

or

less

are

to

be

con-

ea

nected

to

the

left

and

right

“MAIN”

or

“REMOTE”

speaker

9

terminals

(Fig.

2).

-—+-

COMPARATOR

$

After

the

speakers

are

connected

to

this

unit,

turn

on

the

power

switch.

The

muting

circuitry

of

this

unit

will

function

6V

for

about

5

seconds,

until

output

from

the

main

amplifier

.

appears

at

the

speaker,

thus

maintaining

the

muting

relay

1c301

3

aiveor

(RLY601)

in

the

condition

shown

in

figure

1.

Speaker

impe-

teaon

dance

is

detected

during

this

interval.

With

RLY601

in

the

:

2

3]

condition

shown

in

figure

1,

the

speakers

will

be

connected

in

hr

parallel

to

point

@)

of

the

speaker

DC

resistance-detection

circuitry,

and

the

voltage

at

point

(b)

will

decrease.

With

a

reference

voltage

of

1.5V

applied

to

terminal

@

of

the

Fig.

2

comparator

(IC901),

a

voltage

of

6V

will

appear

at

terminal

@

when

the

voltage

of

terminal

@

becomes

lower

than

that

of

terminal

@.

In

other

words,

the

output

voltage

of

terminal

8)

activates

TR902

and

TR901

of

the

relay-drive

circuitry,

and

the

tap-selection

relay

(RLY701)

switches

over

to

the

low-voltage

tap.

When

80

speakers

are

connected

to

the

“MAIN”

and

“REMOTE”

speaker

terminals

and

both

speaker

switches

are

on,

total

impedance

becomes

422,

and

operation

becomes

the

same

as

when

speakers

of

6

or

less

are

connected.

2.

lf

speakers

with

an

impedance

of

89

or

more

are

to

be

connected

to

the

left

and

right

‘“MAIN”

or

“REMOTE”

speaker

terminals

(Fig.

3).

COMPARATOR

The

detection

method

is

the

same

as

when

Speakers

with

an

impedance

of

6

or

less

are

connected.

In

this

instance,

however,

the

voltage

of

terminal

@

of

the

comparator

becomes

higher

than

the

reference

voltage

of

terminal

@),

and

no

output

appears

at

terminal

8)

.

AS

a

result,

q

because

the

relay-drive

circuitry

does

not

operate,

the

relay

(RLY701)

remains

switched

to

the

high-voltage

tap.

Fig.

3

.

If

a

speaker

with

an

impedance

of

8

is

connected

to

the

left

“MAIN”

or

‘“REMOTE”

speaker

terminal,

and

a

40

speaker

is

connected

to

the

right

terminal.

The

detection

method

is

the

same

as

when

speakers

with

an

impedance

of

82

or

less

are

connected.

In

this

instance,

however,

the

6V

voltage

can

be

obtained

only

from

terminal

3)

of

the

right

channel

comparator

(1C902).

This

voltage

is

applied

to

terminal

@)

of

the

left

channel

comparator

(1C901),

and

then,

because

the

voltage

of

terminal

@

of

1C901

becomes

high,

it

can

be

seen

that

the

voltage

of

terminal

@

of

1C901

becomes

equivalently

low.

As

a

result,

a

6V

voltage

can

be

obtained

at

terminal

B)

of

1C901,

and

the

relay

(RLY

701)

switches

the

power

trans-

former

over

to

the

low-voltage

tap.

This

operation

is

the

same

as

when

a

42

speaker

is

connected

to

the

left

speaker

terminal

and

an

8Q

speaker

is

connected

to

the

right

terminal.

Operation

principles

1,

2

and

3

above

are

an

explanation

of

the

circuitry

which

detects

speaker

impedance

after

the

power

is

turned

on

and

until

the

main

amplifier

output

is

emitted

to

the

speakers.

The

following

is

an

explanation

of

the

circuitry

which

detects

impedance

when

the

output

is

being

emitted.

4.

Trigger-pulse-generation

circuitry

MAIN

AMP

Let>

RELAY

B

oe,

EN

reea

:

2.

~”

OLEFT

SPEAKER

This

is

circuitry

which

gene-

°

OOFF

PULSE

OUT

ere

rates

a

positive

pulse

when

a

$13

@1

(s13)

speaker

switch

is

switched

1

OON

C913

D909

from

off

to

on

while

this

unit

ie

tt

+

®

is

operating,

and

generates

a

Baie

bss

fra

negative

pulse

when

the

+Bo

WWW

1

+¢

©

6)

switched

from

on

to

off

(Fig.

4).

ool

freus

@

When

the

speaker

switch

(S13)

is

on,

positive

vol-

Fig.

4

tage

(+B)

is

charged

to

C912

and

C913.

(@)

When

the

speaker

switch

is

switched

from

on

to

off,

the

charge

applied

to

C912

is

suddenly

discharged,

D908

becomes

forward

biased,

and

a

negative

pulse

can

be

obtained

from

in

figure

4.

@

When

the

switch

is

switched

from

off

to

on,

a

positive

voltage

(+B)

is

suddenly

charged

to

C913.

D909

becomes

forward

biased,

and

a

positive

pulse

can

be

obtained

from

@

in

figure

4.

5,

When

a

speaker

switch

is

switched

from

off

to

+B

on.

D906

In

this

instance,

as

explained

in

item

4,

a

posi-

re

7

tive

pulse

is

generated

from

the

trigger-pulse-

generation

circuitry.

This

pulse

is

applied

to

O3sec

the

mono-stable

multivibrator

shown

in

figure

5.

TR905

of

this

circuitry

is

usually

maintain-

me

to

ON

ed

in

the

“off’’

condition,

and

TR906

in

the

“on”

condition.

When

a

positive

pulse

is

applied

to

the

base

of

TR905,

it

becomes

on,

and

the

collector

becomes

ground

potential.

Fig.

5

However,

because

this

transistor

becomes

on

only

at

the

instant

that

the

positive

pulse

is

applied,

the

collector

also

returns

to

positive

potential

about

0.3

second

later.

During

this

interval

of

about

0.3

second,

the

TR907

muting-relay-drive

transistor

becomes

off,

and

RLY601

becomes

in

the

condition

shown

in

figure

1.

Then

speaker

impedance

is

detected

as

described

in

items

1,

2

and

3,

and

the

tap-selection

circuitry

is

activated.

RLY601

to

OFF

.

When

a

speaker

switch

is

switched

from

on

to

off

In

this

instance,

as

explained

in

item

4,

a

negative

pulse

is

generated

from

the

trigger-pulse-generation

circuitry.

This

pulse

is

applied

to

the

mono-stable

multivibrator

shown

in

figure

6.

TR903

of

this

circuitry

is

usually

main-

tained

in

the

“on”

condition,

and

TR904

in

the

“off”

condition.

TR903

becomes

off

only

at

the

instant

when

a

negative

pulse

is

applied

to

its

base,

and

positive

voltage

appears

at

the

collector.

C909

is

charged

by

this

voltage,

and,

at

the

same

time,

TR904

becomes

on.

When

TR904

becomes

on,

the

collector

becomes

ground

potential,

and,

in

the

same

way

as

explained

in

item

5,

this

circuitry

also

returns

to

the

“off”

condition

after

about

0.15

second.

In

this

way,

the

TR904

collector

and

the

impedance

detection

circuitry

are

connected

by

way

of

D903.

During

the

time

that

the

TR904

collector

is

ground

potential,

D903

becomes

forward

biased,

and,

therefore,

the

comparator

function

is

simultaneously

reset

when

TR902

of

the

tap-selection

relay-drive

circuitry

becomes

off.

In

addition,

the

collector

potential

of

TR903

also

returns

to

ground

potential

after

about

0.3

second.

At

this

time,

the

charge

until

now

applied

to

C909

is

discharged,

and

the

negative

pulse

here

generated

is

applied

to

the

base

of

TR906.

Then

TR906

becomes

off,

and,

as

explained

in

item

5,

the

collector

of

TR905

becomes

ground

potential,

and

the

negative

pulse

turns

off

the

TR407

muting-relay-drive

transistor

for

about

0.3

second.

During

this

interval,

the

Operation

of

the

speaker

DC

resistance-detection

circuitry

is

as

already

explained

in

items

1,

2

and

3.

Note

that,

as

shown

in

figure

6,

time

delays

occur

in

each

of

the

pulses.

oe

FROM

4

aN

ae

=

SPEAKER

SWITCH

OV

|

ay

015

oi

Ss

RESET

PULSE

2Sec

ov-—-

\

he1015sec

+—~—

C909

RESET

PULSE

ov

CHARGE

PULSE

am

D903

ov

o—p

+

0.i5sec

i

TR9O6

eae

INPUT

PULSE

-

RLY601

OV

OFF

PULSE

03sec

O3sec

[RELAY

PULSE

|

PULSE

Fig.

6

@

POWER-INDICATION

CIRCUITRY

fe)

0

POWER

AMP

Lr

aaa

Y

¥

Wr

The

power

amplifier

output

signal

is

attenuated

by

the

sensitivity

selector,

and

is

applied

to

the

logarithmic-compression

circuitry.

In

this

cir-

cuitry,

as

shown

in

figure

7,

the

output

chara-

forte

Sencetn

cteristics

change

logarithmically

in

relation

to

CIRCUITRY

input,

and

the

output

is

applied

to

the

window

Fig.

7

comparator

IC.

Here,

the

pulse

waveform

-—

becomes

as

shown

in

figure

8,

and

the

indicator

illuminates

according

to

the

input

of

the

IC

INPUT

(the

output

of

the

power

amplifier).

WINDOW

COMPARATOR;

LOGARITHM

COMPRESSOR

WINDOW

COMPARATOR

IC

(paxtals

e

LIGHT

UP

PULSE

Fig.

8

_

(Low)

a

.

oes

1,2

SOM

FICT

m@

TONE-CONTROL

CIRCUITRY

ee

>

‘

on

(TONE)

TREBLE

i

gee

Configuration

is

as

shown

in

figure

9.

Bass

and

(HIGH)

Y]

treble

are

the

BAX

type

of

control

circuitry,

=

a=

im

~~]

and

a

bandpass

filter

is

used

for

control

of

intermediate

frequencies.

If

the

middle

control

(eabet

is

moved

in

direction

A,

a

valley-like

charac-

AAI

S

crenteioe

teristic

can

be

obtained.

If

it

is

moved

in

TY]

>

direction

B,

a

peak-like

characteristic

can

be

obtained.

Note

that

the

input

signal

will

bypass

the

tone-control

circuitry

if

the

acoustic

cont-

Fig.

9

rol

(“TONE”)

is

set

to

the

“OFF”

position.

BAND PASS

FILTER

B

PROTECTION

CIRCUITRY

When

DC

voltage

appears

at

the

speaker

terminals

of

this

unit,

there

is

protection

circuitry

to

shut

off

the

speaker

relays

and

thus

protect

the

speakers

from

damage,

as

well

as

protection

circuitry

which

short-circuits

the

input

and

prevents

the

signal

from

being

applied

to

the

main

amplifier,

thus

protecting

the

power

amplifier

from

damage

caused

by

overload

or

short-circuitry

of

the

speaker

terminals.

Sisinecitais

sieinatsescias

bt

M@

POWER

TRANSISTOR PROTECTION

CIRCUITRY

When

speaker

terminals

are

shorted

or an

overload

voltage

is

applied

to

the

power

transistor,

the

emitter

resistance

voltage

of

the

power

transistor

is

applied

to

terminals

2

and

3

and

to

terminals

13

and

14

of

IC903.

This

voltage

actuates

the

switching

circuitry

of

|C903,

and

positive

voltage

from

terminal

4

turns

on

TR909.

When

this

happens,

the

TR909

collector

becomes

ground

potential

and

TR916

becomes

off,

thus

causing

the

safety

indica-

tor

connected

to

TR916

to

extinguish.

In

addition,

positive

voltage

also

appears

at

terminals

9

and

10

of

IC903;

TR910

and

TR911

become

on;

and

the

main

amplifier

input

is

shorted.

Note

that,

once

the

prote-

ction

circuitry

has

operated,

the

circuitry

will

remain

in

the

“hold’’

condition

even

though

the

abnormality

is

corrected.

Thus,

if

the

safety

indicator

goes

out,

the

power

should

be

turned

off,

and

not

turned

on

again

until

first

it

is

confirmed

that

there

is

no

abnormality.

(DRIVER)

(POWER)

TREO!

+B

TREIS

$-—

OUTPUT

TR611

TR616

AW

=B

Wi

+B

ae

==

(C903

3

(DRIVER)

(POWER)

|

TR610,

+B

HOLD

A

TR61S

—foerecrork

CIRCUITRY

|

Co

fence]

|

OUIEUL

|

TR612,

|

swITCHING

L$

[SWITCHING

|

-B;

TRE2

|

ge

=

|

oe

k-

prtaien

mn

Osied

a

To

Safety

+B

ae

TRSI6

SUPPLY

Indicator-

!

TR909

Input

ftch-

s

Line

(Reh,

DC

PROTECTION

TR910

TRON

Relay

"CIRCUITRY

Fig.

10

mw

ALIGNMENT

INSTRUCTIONS

......

Main

Amplifier

Circuitry

¢

Main

amplifier

(ICQ)

alignment

1.

The

“ICO”

adjustment

should

be

started

about

5

minutes

after

setting

the

power

switch

to

the

ON

position.

2.

Speakers

switch

to

‘‘push”

position.

3.

Connect

DC

voltmeter

between

TP601

and

(+)

speaker

termi-

nal

of

right

channel.

4.

Adjust

VR602

to

13

mV

on

DC

voltmeter

indication.

5.

Connect

DC

voltmeter

between

Emitter

(TR613)

and

@)

speaker

terminal

of

left

channel.

6.

Adjust

VR601

to

13

mV

on

DC

voltmeter

indication.

¢

Power

level

indication

alignment

1.

Connect

AC

VTVM

to

speakers

terminal.

(Left

and

Right

channels)

2.

Power

display

switch

to

“ON”

position

and

display

range

switch

to

“XO.

1”

position.

.

Selector

switch

to

“AUX”

position.

.

Apply

a

1kHz

signal

to

“AUX”

terminal.

.

Adjust

supply

signal

level

to

12.6V

~

12.7V

output

voltage.

3

4

5.

Volume

control

to

maximum

position

of

set.

6

7

.

Adjust

VR801

until

“200W”’

indicator

lights

up.

e¢

Power

transformer

tap

selection

circuitry

alignment

Notes:

o

Resistors

connected

to

speaker

terminals

should

be

of

low

tolerance

(1%

~

+2%).

o

Each

channel

to

be

adjusted

separately.

1.

Set

volume

control

to

minimum

position

and

speaker

switch

to

‘‘on”’

position.

2.

Connect

oscilloscope

between

TP1

and

chassis

for

left

channel,

and

between

TP3

and

chassis

for

right

channel.

(Set

to

voltage

measurement

range.)

3.

Connect

6.50

resistor

(or

12Q

and

152

coil

resistors

in

parallel)

to

left

channel

speaker

terminal.

4.

Short

TP2

and

TP4

to

chassis.

5.

Adjust

VR901

and

VRQ02

so

that

TP3

output

voltage

is

from

about

OV

to

about

6V.

6.

Connect

6.529

to

right

channel,

and

adjust

VR903

and

V

R904

so

that

TP1

output

voltage

is

from

about

OV

to

about

6V.

(Left

and

Right

channels)

(Left

channel)

and

VR802

(Right

channel)

[SPEAKER

TERMINAL]

DC

Voltmeter

ze

.

et

ro

rant

©

2

VREO2

=

TP601

I<

MAIN

AMP

VR601

Emitter

of

TR613

nae

Ls

u——7

7

MAIN

REMOTE.

DISPI

~

(ON)

{SPEAKERS

TERMINAL

|

(LEFT)

ale

20

ALcon)

LAY

RANGE

om

(X01)

OSCILLOSCOPE

iS)

150

4)

0,00)

eo

|

Ase

‘ite

|

RaCHASSIS

'

frria¢,

|

TP3

[vRs02

TR4

j

i

SX

TP2

CHASSIS

R

[vR903"

———

[vega]

DC

VOLTMETER

TTY

@

Zaller

fetes

(Vy

7.

After

adjustment,

remove

6.50

and

wire

shorting

TP2

and

TP4.

8.

Measure

TR613

collector

voltage

when

8

speakers

are

connected

to

speaker

terminals.

9.

Next,

connect

60

speakers

to

speaker

terminals,

and

confirm

that

TR613

collector

voltage

is

about

10V

lower

than

voltage

measured

in

item

8.

[7]

m@

ALIGNMENT

INSTRUCTIONS

......

FM/AM

Tuner

Circuitry

Notes:

1.

Muting

switch

........

OFF

5.

Mode

switch..........

MONO

2.

Band

selector

switch

.....

AM/FM

AUTO

(FM,

RF

FM.-IF)

6.

Maintain

tine

voltage

at

120

volts.

3.

FM

muting

switch.....

..,

OFF

7.

3002

FMdummy

antenna.........

Refer

to

fig.

1

4.

Speaker

switch..........0N

8.

Output

of

signa!

generator

should

be

no

higher

than

necessary

to

obtain

an

output

reading.

INDICATOR

(AC

VTVM

or

SCOPE)

(DISTORTION

METER)

AM

ALIGNMENT

SIGNAL

GENERATOR

DIAL

SETTING

CONNECTION

|

FREQUENCY

ADJUSTMENT

POINTS

REMARKS

Plat

side

shrovan

T2010

tase

iF)

(A)

1

0.0014F

to

AM

antenna

455k

Hz

Point

of

non-

Connect

VTVM

or

scope

7201

(1st

JET)

(8)

Adjust

for

maximum

trimmer

terminal.

(30%

Mod.

inter-ference

to

TP201.

through

0.

1KF

E

output.

Common

to

chassis.

with

400Hz)

T202

(2nd

IFT)

Move

L201

as

shown

Fashion

loop

of

several!

in

‘alignment

points”

turns

of

wire

and

radiate

GOOKH2

Connect

VTVM

or

Scope

L202

(OSC

Coil)

Adjust

for

maximum

#

cghalinto

leap

of

rece!

os

Med

|

O0OKr

2

lorspeaker

tenmirrals

L201

(ANT

Coil)

output,

Adjust

ferrite

signal

into

loop

of

receiver

with

400Hz}

Of

receiver:

put,

Adj

core

of

L201

by

screw

driver.

Adjust

for

maximum

Fashion

loop

of

several

1500k

Hz

Connect

VTVM

or

scope

:

3]

turns

of

wire

and

radiate

(30%

Mod.)

1500k

Hz

to

speaker

terminals

aes

at

SUA

ad

ablaaa

steps

(2)

and

(3)

signal

into

loop

of

receiver

with

400Hz}

of

receiver.

Pp

.

{|

es

_L

FM-IF

ALIGNMENT

2

Point

of

non-

T102

(DISCRI

IFT)

(A)

|

Adjust

for

center

3

No

Signal

inter-ference

Tuning

meter

of

set

a

Orange

Core

|

position

of

tuning

meter.

FM-RF

ALIGNMENT

L7

(OSC

Coil)

: :

Connect

to

FM

3000.

9O0MHz

Connect

scope

to

L5

(RE-DET

Coil)

Adjust

for

maximum

5]

antenna

terminal

through

(100%

Mod.

QOMHz

speaker

terminals

of

L2

(RE-DET

Coil)

amplitude

and

sym-

FM

dummy

antenna.

with

400H.z)

receiver.

L1

(ANT

Coil)

metrical

curve.

T101

(FM

IFT)

(Refer

to

fig.

4)

Connect

to

FM

300

106MHz

Connect

scope

to

CT4

(OSC

Trimmer)

Adjust

for

maximum

am-

6]

antenna

termina!

through

(100%

Mod

106MHz

speaker

terminals

of

CT3(RF

DET

Trimmer)

pusige

and

symmetrical

FM

dummy

antenna.

with

400Hz)

receiver.

CT2

(RF

DET

Trimmer)

Repeat

steps

(5}

and

(6).

CT1

(ANT

Trimmer)

FM

MONO

DISTORTION

ALIGNMENT

Connect

to

FM

300Q

1OQMHz

Connect

distortion

meter

T102(DISCRI

IFT)

(B)

Adjust

for

minimum

7]

antenna

terminal

through

(100%

Mod.

1OOMHz

to

speaker

terminals

Green

Cot

distortion

meter

,

FM

dummy

antenna

with

400H

2)

of

receiver

eer

&

indication

4

Apply

60

dB

to

set.

FM

MUTING

LEVEL

ALIGNMENT

FM

muting

switch

to

"ON".

M103

Adjust

to

that

output

can

be

obtained.

Connect

to

FM

3002)

1OOMH2

antenna

terminal

through

(100%

Mod

100MHz

FM

dummy

antenna.

with

4007)

Apply

16dB

(6.3uV)

to

set

Connect

VTVM

or

scope

to

speaker

terminals.

FM

SIGNAL

METER

ALIGNMENT

1

Apply

100MHz

FM

signa!

of

100d8

(400Hz

30%

modulation)

3

Adjust

VR102

for

about

4.7

point

of

signal

meter

indication.

to

FM

3002

antenna

terminal

through

FM

dummy

antenna

2

Tuning

at

1OOMHz.

FM

MPX

PILOT

ALIGNMENT

Using

a

frequency

counter

Using

alternate

system

{

j

1

98MHz

Non-modulated

mono

signal

applied

to

set

1

Apply

stereo

signa!

from

generator

or

stereo

station

to

receiver

10]

2

Muting

switch

to

"ON".

2

Adjust

VR301

until

stereo

indicator

lights

up.

Cement

arm

of

3

Connect

frequency

counter

to

TP302

through

resistor

(100k)

VR301

as

shown

in

fig.

2.

4

Adjust

VR301

to

19kHz,

+30Hz

Notes:

1.

Stereo

modulator

*

Connect

stereo

modulator

output

to

EXT

MOD

terminal

of

signal

generator.

¢

Pilot

signal

modulation

to

‘10%’

2.

FM

signal

generator

*

Frequency

approximatery

100MHz/Output

level

to

'’72dB

(HF}”

e

Modulation

mode

to

“FM”

3.

Selector

switch

to

“FM

AUTO”

4.

Mode

switch

to

“STEREO”

———

BEcae

on

STEREO

MODULATOR

INDICATOR

ADJUSTMENT

pena?

CONNECTION

MODE

&

MOD.

RATE

(AC

VTVM}

|

POINTS

FM

MPX

PILOT

CANCEL

ALIGNMENT

A

Tuning

at

1OOMHz

FM

3002.

antenna

19kHz(Pilot)

signal

|

Connect

AC

VTVM

or

.

:

eit

11]

terminals

through

FM

10%

ae

scope

to

speaker

a

*¢

FM

Muting

switch

to

“ON

dummy

antenna.

terminals.

¢

Make

adjustment

to

bring

the

output

to

minimum.

FM

MPX

FILTER

ALIGNMENT

¢

Tuning

at

1OOMHz

FM

3002

antenna

38kHz

100%

Connect

AC

VTVM

or

°FM

Muting

switch

to

“ON”

.

72)

terminals

through

FM

Modulation

scope

to

speaker

an

eFM

Hi-blend

switch

to

‘OFF

dummy

antenna.

{External

Modulation)

terminals.

¢

FM

MPxX

Filt

switch

to

“IN

¢

Make

adjustment

to

bring

the

i

output

to

minimum,

FM

STEREO

SEPARATION

ALIGNEMNT

i

|

*

Tuning

at

1OOMHz

i

FM

300f

antenna

(1kHz

30%

Modulation)

|

Connect

VTVM

to

speaker

¢

Make

adjustment

so

that,

when

i

13]

terminals

through

FM

MODE

L

(and

R})

terminals

through

low

pass

VR303

the

antenna

input

is

subjected

to

t

dummy

antenna.

Pilot

signal

to

"ON"

filter.

.

L

modulation

{or

R

modulation),

(Refer

to

fig.

3)

R

channel

output

(or

L

channel

output)

becomes

minimum.

Sma

tte

ton

ain

ttt

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