Panasonic RS-790S Manuel utilisateur

PRDER

NO.

ARD-711034

MODEL

Hay

Hue

ool

SOLID

STATE

4-TRACK

STEREO

TAPE

RECORDER

move.

RS-790S

SPECIFICATIONS

Power

Source:

AC:

117

volts

cps

Frequency

Response:

40~18,000

cps

7-1/2

ips

Power

Consumption:

Approx.

40~10,000

cps

3-3/4

ips

Music

Power

Output:

BWx2

_—

eres

;

ose

“

Transistor:

288

346

(4)

175A

(4)

peat

Output

LINE”

1OKQ

GOdB

(2)

ape

‘

Diode

Rectifier:

(2)

FR-1M

(1)

25F

(1)

“EXT.

SP”

(2)

Recording

System:

bias

“HEADPHONE”

8©

(1)

Erasure

System:

erase

Program

Time:

hours

for

7”

150%

tape

Reel

Size:

7”

max.

;

1-7/8

ips

Track

System:

track

stereo

system

Recording

Level

Indicator:

meter

‘ 1

‘nd

a”

Tape

Speed:

speeds,

7-1/2,

3-3/4

and

Built-in

Speaker

7”

x5”

dynamic

speaker

(

1-7/8

ips

Dimensions:

16-11/16”

(W)

17-3/167

(H)

9”

(D)

Weight:

Approx.

38-1/4

MATSUSHITA

ELECTRIC

CORP.

AMERICA

Pan-Am

Tiv'g.,

200

Park

Ave.,

New

York,

N.Y.

10017

HAWAII/MATSUSHITA

ELECTRIC

HAWAII

INC.,

205

Kalihi

St.

Honolulu,

Hawaii

96819

CANADA/MATSUSHITA

ELECTRIC

CANADA

LTD.,

1054

Kipling

Ave.

North,

Rexdale,

Ont,

©@OOOGO9OO8

OHO

LOCATION

PARTS

@®

®@

©®

Fig.

Speed

Selector

Switch

Reflector

for

Channe!

Speaker

Right

Reel

Tape

Counter

Function

Lever

Stereo/Monaural

Selector

Switch

Stereo

Headphone

Jack

Channel

Volume

Control

and

Power

ON/OFF

Switch

Channel

Tone

Control

and

Monitor

Switch:

Meters

Channel

Tone

Control

and

Monitor

Switch

Channel

Volume

Control

”

Record

Buttons

®28

8809

ene

Fig.

heer

[ett

aie

[ss

—

Pause

Lever

Direction

Push

Buttons

(Forward

and

Reverse)

Left

Reel

Reflector

for

Channel

Speaker

Channel

Microphone

Jack

Channel

Microphone

Jack

Chennel

Auxiliary

Jack

Channel

Auxiliary

Jack

Channel

Line

Output

Jack

Channel

Line

Output

Jack

Channel

External

Speaker

Jack

Channel

External

Speaker

Jack

Speaker

ON/OFF

Switch

Sensing

Pole

for

Automatic

Reverse

Left

Pressure

Roller

Left

Capstan

Record/Playback

Head

for

Reverse

Operation

Erase

Head

for

Reverse

Operation

Tape

Shifter

Erase

Head

for

Forward

Operation

Record/Playback

Head

for

Forward

Operation

Right

Capstan

Right

Pressuré

Roller

Automatic

Shut-off

Switch

Sensing

Pole

for

Automatic

Re-reverse

nee

SUSE

BLOCK

DIAGRAM

ELECTRICAL

CIRCUITS

RECORDING

CIRCUIT

“(F)

RECORD

¥y

EQUALIZATION

HEAD

HW:

(RIO

oxo

(113)

ERASE

(F)

lhe

AK)

HEAD

ajo

SHS

OSCILLATOR

(RrO

Sian)

eu]

‘gt

EQUALIZATION

(t2)

Gri)

—

pe)

RECTIFICATION

(M)

“We

CONSTANT

VOLTAGE

Fig.

FORWARD

PLAYBACK

(Fr

HEAD

(R)

FORWARD

REVERSE

PLAYBACK

HEAD

PLAYBACK

HEAD

tp:

ik)

}

{

REWIND

PLAYBACK

HEAD

Fig.

HOW

REMOVE

(E)

PANEL

foe

(G)

;

(F)

(G)

(C)

ran

Fig.

;

Remove

the

Head

Cover

(A).

Remove

the

Speed

Selector

Knob

(E).

Remove

the

Volume

Controls

and

Tone

Controls

(B)

Remove

Setscrews

(F)

the

center.

Controls).

Remove

Setscrews

(G)

the

Panel,

and

draw

out

Remove

the

Function

Lever

Knob

(C).

the

Panel

Slowly.

Remove

the

Pause

Lever

Knob

(D).

HOW

REMOVE

BODY

CASE

Fig.

First

remove

the

Panel.

Remove

the

Body

Case

slowly

lifting

it.

Remove

Setscrews

(H)

the

Mechanism

Chassis.

Lead

Wire

the

Speaker

can

separated

the

Turn

the

set

upside

down,

and

remove

Setscrews

Ccnnector

removed.

Rubber

Feet.

TAPE

TRANSPORT

OPERATIONS

GENERAL

OPERATING

INSTRUCTIONS

RS-790S

operated

with

3-Position

Lever.

When

this

Lever

set

PLAY,

the

unit

placed

into

the

playback

mode.

and

the

Tape

{Ss

forwarded

the

right

left

constant

speed.

When

the

Lever

set

PLAY

while

pressing

the

Record

Button,

the

unit

placed

into

the

recording

mode.

When

the

Lever

set

FAST

WIND,

the

Tape

forwarded

rapidly

the

right

left.

When

the

Lever

set

STOP

thereby

releasing

all

the

mechanisms,

the

Tape

stops

running

while

the

Motor keeps

rotating.

POWER

SUPPL

The

Channel

Volume

Control

Knob

used

for

switch-

ing

the

power

source

and

OFF.

When

the

Tape

finishes

during

recording.

playback

fast

forwarding.

the

Tension

Arm

switches

off

the

power

source

the

Automatic

Shut-Off

Mechanism

functions.

THREADING

TAPE

The

Tape

can

threaded

only

when

the

Operating

Lever

set

STOP.

When

set

other

position

than

STOP,

the

Shut-Off

Arm

rises

out

that

the

Tape

cannot

threaded.

PLAYBACK

Set

the

Operating

Lever

PLAY.

Select

the

direction

Tape

the

Direction

Buttons.

Tracks

and

are

played

back

the

normal

forward

mode,

while

Tracks

and

the

reversing

mode.

The

Sound

Reflectors

are

opened

that

the

best

results

will

obtained.

RECORDING

Depress

the

Record

Button

(both

Buttons

the

case

Stereo)

the

Channel

which

you

desire

make

recording.

Set

the

Operating

Lever

PLAY.

Select

the

direction

Tape

the

Direction

Button.

Tracks

and

can

recorded

the

normal

forward

mode,

while

Tracks

and

the

reversing

mode.

FAST

FORWARD

When

the

Operating

Lever

set

FAST

WIND,

the

Tape

forwarded

fast

the

right

left.

Select

the

di-

rection

the

Tape

the

Direction

Button

before

turn-

ing

the

Operating

Lefer.

When

changing

the

direction

fast

forwarding,

the

Operating

Lever

should

set

STOP.

SELECTION

TAPE

SPEED

Tape

speed

can

selected

only

while

the

motor

rotating

(only

while

the

power

supplied).

the

Speed

Selector

Lever

moved

with

the

power

source

switched:

~~~"

OFF,

the

Belt

may

get

entangled

with

the

Motor

Pulley

when

the

power

source

switched

on.

AUTOMATIC

RECIPROCATION

you

attach

Sensing

Tape

(Metal

Sensing

Foil)

both

ends

the

Tape,

continuous

playback

available

be-

tween

them

until

the

Tape

stops.

the

case

re-

cording,

after

reciprocal

recording,

the

Tape

does

not

reverse

for

the

2nd

reciprocation,

but

taken

onto

the

Left

Reel

regardless

the

Sensing

Tape.

This

order

prevent

re-recording

the.

once

recorded

Tape.

Sent

TREO

PLAYBACK

Idler.

Off

Lever

;

(Right

Capstan}

Right

Pressure

Roller

Brake

Off

Lever

aie

NeoD)

Main

Cam

Plate

{———5

Left

Pressure

‘Slide

Plate)

//Right

Pressure

Play

Lever

Roller

Lever

;

Roller

Lever

Left

Click

Plate

Right

Click

Plate

Left

Capstan}

Pressure

Roller

Fig.

‘(See

Figs.

7~9.

The

numerals

parentheses

correspond

moves

the

Idler

Operating

Belt

(5),

and

slant

the

Idler

Ref.

Nos.

inthe

figure.)

Lever

(7),

thereby

pressing

the

Right

Idler

against

the

Bes

;

When

the

Operating

Lever

set

PLAY,

the

following

Motor

Pulley

and

Right

Reel

Table

Friction

Pulley

(7).

actions

‘occur

simultaneously,

and

the

Tape

forward:

the

same

time,

the

motor

pulley

rotation

makes

the

Right

the

right

left

constant

speed.

(The

direction

Reel

Table

(8)

turn

take

the

Tape

through

the

“|

the

Tape

selected

the

Direction

Button.)

Right

Idler

(6).

the

Operating

Lever

turned,

the

Main

Cam

Plate

The

motor

pulley

rotation

transmitted

the

Capstan

moves

(1),

and

the

Play

Lever

pushed

down

(2).

The

Belt

(4)

and

turn

the

Right

and

Left

Flywheel,

thereby

Play

Lever

Pushes

the

Slide

Plate

(3),

and

the

Right

forwarding

Tape

constant

speed

the

Right

and

Left

Paw

Plates

connected

with

pushes

the

Right

Left

Capstan

Shafts

(9).

this

time

the

P.M.

the

and

Left

Pressure

Roller

Levers

(4,

6).

The

Pressure

Capstan

Shaft

the

tape

takeup

side

little

Roller

Levers

press

the

Pressure

Rollers

the

Right

and

than

that

the

Capstan

the

reverse

side

due

Left

Capstan

Shafts,

respectively

(7).

The

pressure

reduction

the

actual

flywheel

diameter

the

belt

the

Pressure

Roller

against

the

Capstan

made

tension,

and

therefore

the

Tape

between

both

Capstans

Spring

(5),

and

uniform.

maintains

its

tension.

the

other

hand,

the

Brake-Off

Lever

moved

the

The

same

applies

the

reverse

forward.

The

Plunger

Main

Cam

releases

both

Reel

Table

Brakes

(11),

and

performs

selection

motor

polarity

and

change

the

same

time

moves

the

Idler-Off

Lever.

thereby

making

Heads,

and

the

Tape

forwarded

the

left

thr

ough

the

Idler

move

freely

(9,10).

During

the

normal

for-

same

actions

the

normal

forward.

ward,

the

motor

pulley

rotation

(counterclockwise)

(4)

{

}

{

Motor

Pulley

Left

Reel

Table};

Plunger

Lever

‘Left

Capstan

(Left

Flywheel}

“~

(EF

Brake

Arm

Head

Switch

Arm

Capstan

Belt

Idler

Operating

Belt

Right

Idler

Right

Reel

Table

Right

Capstan

Right

Flywheel

Idler

Lever

RECORDING

When

the

Record

Button

depressed,

the

Record/Play-

back

Selector

Switch

the

Printed

Base

Plate

placed

into

the

recording

mode.

When

the

Operating

Lever

turned

PLAY,

the

Tape

moves

through

the

same

actions

playback,

and

carries.on

recording.

AUER!

ASTOR

eee

FAST

FORWARD

Idler

Lever

Slide

Plate

—

WLLL

LIZZ

When

the

Operating

Lever

set

FAST

WIND,

the

Main

Left

Idler

against

the

Reel

Table

and

Motor

Pulley.

(Since

Cam

Plate

moves

the

Play

Lever

bring

down

the

Slide

the

Idler

pushed

upward

mentioned

above,

Plate.

(See

(1)

and

(2)

Fig.

10)

The

Paw

the

slide

pressed

against

the

Reel

Table

instead

the

Friction

plate

end.

pulls

the

Fast

Forward

Lever,

thereby

pushing

Pulley.)

(See

Fig.

12)

Through

the

Idler,

the

motor

pulley

the

Idler

Lever.

(See

Fig.

11)

the

motor

rotates,

rotation

makes

either

the

Right

Left

Reel

Table

turn

the

Operating

Belt

works

press

either

the

Right

fast,

thereby

taking

the

Tape.

Fig.

INSTANT

STOP

(PAUSE

CONTROL)

(See

Fig.

13)

Tape

Shifter

Lever

Fig.

When

the

Pause

Lever

depressed

during

playback

recording,

the

following

actions

occur

simultaneously

and

the

Tape

stops.

When

the

Pause

Lever

turned

down,

the

Inst.

Lever

(3)

moves

the

Right

and

Left

Pressure

Roller

Levers,

thereby

separating

the

Pressure

Roller

from

the

Capstan.

the

same

time,

turns

down

the

Tape

Shifter

Lever,

thereby

separating

the

Head

Pad

from.

the

‘head,

and

the

Tape

from

the

head

surface.

Also.

the

Inst.

Lever

pulls

the

Brake

Rod,

thereby

putting

the

Reel

Table

Brakes.

The

Pause

Lever

locked

the

Spring.

Either

one

the

Pause

Lever

and

Operating

Lever

can

‘be

operated

first.

MECHANICAL

ADJUSTMENTS

PRESSURE

ROLLER

Fig.

(Pressure

Roller

Lever

Spring

)

Slide

Plate

Assembly

Right

Capstan

(Left

Capstan

Left

Pressure

Roller)

(Right

Pressure

Roller

Fig.

Specified

Value:

1.4~1.9kg

The

difference

pressure

between

the

Right

and

Left

Pressure

Rollers

should

less

than

0.25

kg.

Measuring

Method:

Use

spring

scale

full

scale.

During

the

playback,

pull

the.

spring

scale

the

line

ocamnaacucanseanscunes:

between

the

center

the

Capstan

and

that

the

Pressure

Roller

the

separating

direction,

and

take

the

reading

the

spring

scale

when

the

Tape

stops.

(See

Fig.

14)

Adjusting

Method:

eas

Make

the

adjustment

use

elongation

and

contrac-

tion

the

Pressure

Roller

Lever

Spring.

(See

Fig.

15)

Head

Pad

Spring

(Bend

)(

Head

Pad

Spring

(Bend

))

Increase}

Fig.

Specified

Value:

(Erase

Head)

mat

’

(Record/Playback

Head)

Measuring

Method:

Measure

the

force

separating

the

Pad

from

the

Head

above

the

center

the

Pad

Plate

use

tension

5~10g

10~15¢g

gauge.

(See

Fig.

16)

Adjusting

Method:

Make

the

adjustment

use

bending

the

Head

Pad

Spring.

(See

Fig.

17)

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