Panasonic Rs-736us User manual

AIO

ER

NO.

ARD-7007062

MODEL

RS-736US

h

tn

i"

ail

|

ft

wail

ll

lout

Tu

il

hin

4

TRACK

STEREO

TAPE

DECK

WITH

3

HEADS

AND

WIDE

FREQUENCY

RESPONSE

SPECIFICATIONS

Power

Source:

AC

:

120

volts

60

Hz

MODEL

RS-736US

Frequency

Response:

20~32,000

Hz

at

15

ips

Power

Consumption:

Approx.

50

W

Sosa

oo

ae

im

saa

ie

Motor:

4

poles

synchronous

with

center

floating

Wow

&

Flutter:

Below

0.09%

at

15

ips

motor

Recording

System:

AC

bias

200

kHz

Below

0.09%

at

7-1/2

ips

Below

0.13%

at

3-3/4

ips

Erasing

System:

Track

System:

Tape

Speeds:

Maximum

Reel

Size:

Signal-Noise

Ratio:

Fast

Forward

Time:

Rewind

Time:

AC

Inputs:

2

“MIC”

inputs

20KQ

plese

2

"PHONO-1”

inputs

1MQ

4

track

2

channel

system

2

“PHONO-2”

inputs

47

KQ

2 2

:

2

“AUX-1”

inputs

250

KQ

aie

15,

7-1/2

and

3-3/4

ips

2

“AUX-2”

inputs

50KO

7

Outputs:

2

“LINE

OUT-1”

outputs

1V

53

dB

or

mo

2

“LINE

OUT-2”

outputs

lV

ae

7

1

“HEADPHONE”

output

55

mV

Less

than

150

seconds

for

7"

standard

Record/Playback

tape

(1200

ft)

Connector:

CES

standard

Less

than

175

seconds

for

7”

standard

Dimensions:

17”

(W)

x

8-1/2”

(H)

x

18-1/2”

(D)

tape

(1200

ft)

Weight:

33

Ibs

MATSUSHITA

ELECTRIC

CORP.

OF

AMERICA

Pan-Am

Bidg.,

200

Park

Ave.,

New

York,

N.Y.

10017

320

Waiakamilo

Road

Honolulu,

Hawaii

96817

40

Ronson

Drive,

Rexdale,

Ont.

MATSUSHITA

ELECTRIC

OF

HAWAII,

INC.

MATSUSHITA

ELECTRIC

OF

CANADA

LTD.

LOCATION

OF

PARTS

®@®

®®©

©

@®

Supply

Reel

Table

@

Head

Cover

@®

Tape

Speed

Selector

knob

@®

Capstan

®

Takeup

Reel

Table

®

Pressure

Roller

@

Right

Tension

Arm

Cue

Lever

®

Function

knob

Output

Adjustment

Controls

@

NFD

Switch

@

Tape

Selector

@)

Monitor

Changeover

Switches

Power

Switch

@

Echo

Switch

Sound-on-Sound

Channel

Changeover

Switch

@

Sound-on-Sound

Switch

Sound-on-Sound

&

Echo

Adjustment

Control

Equalizer

Changeover

Switch

UX-2

Input

Level

Adjustment

Control

UX-1

Input

Level

Adjustment

Control

IC

(Phono)

Input

Level

Adjustment

ontrol

put

Changeover

Switch

icrophone

Jacks

eadphone

Jack

ecording

Input

Indicator

Lamps

U

Meter

Zero-point

Adjustment

Screws

U

Meters

Recording

Level

Controls

Record

Buttons

6)

Tape

Counter

&

Reset

Button

Guide

Roller

83)

Left

Tension

Arm

6)

Phono-1

(X’TAL)

Input

Jacks

@)

Phono-2

(MAG)

Input

Jacks

AUX-1

Input

Jacks

@)

AUX-2

Input

Jacks

68

Line

Out-1

(FIX)

Jacks

@)

Line

Out-2

(VAR)

Jacks

Record/Playback

Connector

@

Ground

Terminal

@

Power

Socket-A

@

Power

Socket-B

@

Power

Cord

(120

V,

60Hz)

@

Tape

Guides

a)

Tape

Cleaner

4)

Shut-off

Lever

@)

Erase

Head

@

Recording

Head

6)

Tape

Shifter

Fig.

1

6)

Playback

Head

PANASDNIG:

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8®

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2 ©

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@

(=

DISASSEMBLY

INSTRUCTIONS

HOW

TO

REMOVE

PANEL

(A)

(G)

(H)

(I)

(B)

(1)

1.

Remove

Tape

Speed

Selector

Knob

(A),

4

Control

and

Function

Knob

(H).

Knobs

(B)

and

6

Knobs

(C).

3.

Remove

8

Pane!

Holding

Screws

(1)

and

take

out

2.

Remove

3

Jack

Holding

Nuts

(D),

Guide

Roller

(E),

2

Panel.

Head

Cover

Holding

Screws

(F),

Pressure

Roller

(G)

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HOW

TO

REMOVE

BODY

CASE

1.

Remove

8

Body

Case

Holding

Screws

(J).

|

2.

Remove

the

Body

Case

slowly

lifting

it.

MECHANICAL

PRESSURE

OF

PRESSURE

ROLLER

As

the

Pressure

Roller

is

pressed

against

the

Capstan,

the

Capstan

rotation

is

transmitted

to

the

Tape

between

Pressure

Roller

and

Capstan.

But

when

pressure

of

the

Pressure

Roller

against

the

Capstan

is

insufficient,

slip-

ping

occurs

and

the

Capstan

rotation

is

not

conveyed

smoothly.

Therefore,

this

pressure

should

always

be

kept

moderate.

Given

hereunder

are

the

measurement

and

adjustment

methods.

Measuring

Method:

Instruments

Required:

Spring

Scale,

Strong

Thread

1.

Thread

the

Tape

and

place

the

set

into

the

Playback

mode.

2.

Make

a

loop

of

the

thread

and

hook

the

Pressure

Roller

Shaft

to

the

Spring

Scale

with

it.

3.

Pull

the

Spring

Scale

slowly

along

the

straight

line

between

the

Pressure

Roller

Shaft

and

the

Capstan

2kg

Full

Scale,

Spring

Scale

NOTE:

Pull

it

along

the

extension

of

a-o

ADJUSTMENTS

Shaft,

and

read

the

value

on

the

Spring

Scale

when

the

Tape

stops

running

or

when

the

Pressure

Roller

moves

away

from

the

Capstan.

4.

The

standard

pressure

(value

on

the

Spring

Scale)

is:

(1.3~1.7

kg)

NOTE:

The

Capstan

and

the

Pressure

Roller

should

be

in

parallel.

If

they

are

not

in

parailel,

the

Tape

moves

up

and

down

between

the

Pressure

Roller

and

the

Capstan,

or

only

a

side

of

the

Tape

is

tensioned.

The

adjustment

is

made

by

correct-

ing

the

bent

Pressure

Roller

Shaft.

Adjusting

Method:

Make

the

adjustment

by

use

of

elongation

and

contrac-

tion

of

the

Pressure

Roller

Lever

Spring.

Measure

pressure

of

the

Pressure

Roller

and

check

if

it

satisfies

the

specified

value.

(Fig.

4)

Pressure

Roller

Fig.

4

Make

the

adjustment

by

use

of

elongation

and

contraction

|

of

the

Pressure

Roller

Lever

Spring.

(Fig.

5)

(Playback

Head)

(Capstan

Shaft)

|

Tape

Shifter

|

L

Pressure

Roller

Lo

|

H

(Record

Head)

(Erase

Head)

—~U

Bend

the

Angle

of

the

Spring

Hook

and

effect

the

adjustment

Record

Pad

(Pressure

Roller

Lever)

Playback

Pad

Fig.

5

(nudaunaneedunsanvensspuaeeneneseenepenussueneasennsauascesnsaenneausnnaeKenasenauneessnnesndunsuWunernsenasenanessaesmmenausuuegenaaneneanNnuORnnnneNuuserennnecusonenursnunennanaenumannannunusenenencuunmnanaunuaarensanKNaaneoneseuaeny

TAKEUP

TENSION

DURING

RECORD/PLAYBACK

OR

FAST

FORWARD

Though

the

Capstan

rotates

and

the

Tape

runs,

the

Tape

3.

Place

the

set

into

the

Playback

mode.

(If

the

Takeup

is

not

taken

up

if

takeup

torque

is

too

small.

Especially

Tension

of

Fast

Forward

is

to

be

measured,

place

the

when

this

torque

is

small,

the

Tape

loosens

and

when

set

into

the

Fast

Forward

mode.)

Allow

the

Gauge

too

big,

the

Tape

is

elongated

or

broken.

Therefore,

to

follow

the

taking

up

force.

When

the

value

on

takeup

torque

should

be

controlled

suitably.

the

Tension

Gauge

becomes

constant,

read

the

graduation.

Repeat

this

procedure

several

times

and

take

an

average.

Measuring

Method:

4.

Conduct

the

measurement

with

the

Tape

fully

wound

Instruments

Required:

Tension

Gauge,

Splicing

tape

on

the

7”

Reel.

The

standard

Takeup

Tension

should

1.

Place

a

full

reel

of

7”

Tape

on

the

Takeup

Reel

Table

be:

and

make

a

loop

of

the

Tape

end

by

using

Splicing

Takeup

Tension

during

Recording/Playback

Tape.

(25~35

gr)

2.

Hook

the

Tension

Gauge

to

the

loop

of

Tape

end

and

Takeup

Tension

during

Fast

Forward

unreel

about

30”

of

Tape.

(more

than

140

gr)

i

In

Normal

Forward

:

Operation

|

Splicing

Tape

Fig.

6

Takeup

Reel

Table)

~—-(Takeup

Reel

Table

Pulley

(2))

Reel

Table

Felt

:

|

(Takeup

Reel

Table

Pulley

(1)

(Friction

Spring

prt

|

Ged

iA

te

pa

YA

Ye

LOT

gg

2

Fig.

7

Friction

Spring

—_—

Fig.

8

Adjusting

Method:

For

Recording/Playback,

adjustment

is

done

by

using

the

Friction

Spring

which

is

under

the

Takeup

Reel

Table

Pulley.

For

too

strong

Takeup

Tension

.........

Turn

the

Friction

Spring

counter-clockwise

(viewed

from

below)

to

de-

crease

the

tension.

For

too

weak

Takeup

Tension

.........

Turn

the

Spring

POPE

CEES

TTL

EE

TELL

LLL

Leet

tite

Oo

ELLE

iE

a

nia

a

iid

BRAKE

POWER

ADJUSTMENT

Left

Reel

Weak

Power

|

Direction

;

Right

Reel

Fig.

9

clockwise

to

increases

the

tension.

The

takeup

tension

may

increase

or

decrease

when

the

Reel

Table

Shaft

is

out

of

oil

or

the

Friction

Washer

gets

stained

with

oil.

In

Fast

Forward

the

Felt

between

the

Reel

Table

Pulleys

may

get

stained

with

oil

or

dust,

lowering

the

takeup

tension.

The

standard

conditions

are

obtained

by

wiping

off

the

stains

completely.

Strong

Power

Direction

Abnormal

tension

may

sometimes

be

applied

to

the

tape

if

the

brake

fails

in

timing.

It

is,

of

cource,

necessary

to

provide

sufficient

brake

power

to

stop

the

tape,

but

it

is

all

the

more

necessary

to

pay

attention

to

the

timing.

Specified

Value:

Strong

Power

Direction

100~250g8

Weak

Power

Direction

40~70¢g

The

difference

in

brake

power

between

the

strong

power

direction

and

weak

power

direction

should

be

more

than

100

g.

(One

side

Strong

Power

Direc-

tion,

and

the

other

side

Weak

Power

Direction)

Measuring

Method:

Instruments

Required:

Tension

Gauge,

Splicing

Tape

Suspend

a

tension

gauge

from

the

end

of

the

7”

Reel

Tape

in

the

stop

mode,

pull

it

and

read

the

average

value

for

a

turn

of

the

Reel.

(Fig.

9)

Brake

power

differs

according

to

the

reel

table

rotating

direction,

viz.,

either

clockwise

or

counter-clockwise.

Therefore,

the

measurement

should

be

taken

in

both

cases.

Left

Reel

Table

Brake

Rod(1)

Fig.

10

Right

Reel

Table

Pulley(1)

Adjusting

Method:

Make

the

adjustment

by

use

of

elongation

and

contrac-

tion

of

the

Right

and

Left

Brake

Springs.

(Fig.

10)

Brake

Timing:

During

FF

or

PLAY

mode,

brake

should

be

SA

een

ee

a

nee

deen

nme

RGRER

AREA

SORA

RERR

Re

nRHER

AHR

ARN

ON

RON

SRETORNOR

ESE

REN

ARR

ead

eon

Ree

ERRE

NORE

ROSRHOEReEsREAeedEenensonnen:

applied

earlier

on

the

Supply

Ree!

side

than

the

Takeup

Ree!

side.

The

reverse

applies

during

the

REW

or

REVERSE

mode.

non

RonaDa

SE

seRnnenuenennsessenneensasuaunnnESennnennaaesansnaennnnnenenn

eke

nODRGRRGESRRARHAHREOEESEMERMAnannnenneanons

BACK

TENSION

DURING

RECORD/PLAYBACK

OR

FAST

FORWARD

Back

Tension

has

a

relation

to

Tape

Driving

Power

of

the

Capstan.

Too

high

or

too

low

Back

Tension

exerts

bad

effect

on

tape

speed

and

increases

wow

and

flutter,

preventing

the

Tape

from

running

smoothly.

Back

Ten-

sion

should

therefore

be

adjusted

carefully.

Measuring

Method:

Instruments

Required:

Tension

Gauge,

Splicing

Tape

1.

Place

a

full

reel

of

7”

Tape

on

the

Supply

Reel

Table.

While

unreeling

theTape,

make

the

measurement

in

the

same

way

as

for

measurement

of

takeup

tension

during

Recording

Playback.

2.

When

the

Tape

is

fully

wound

on

the

7”

Reel,

the

standard

Back

Tension

is:

Back

Tensien

during

Recording/Playback

:

10~25

ger

Back

Tension

during

Fast

Forward:

10~25

gr

Adjusting

Method:

1.

If

Back

Tension

is

high:

The

Supply

Reel

Table

Shaft

is

dirty

or

is

out

of

oil

or

stain.

2.

|f

Back

Tension

is

low:

The

tension

of

Rewind

Belt

or

of

Counter

Belt

is

too

low.

Therefore,

it

should

be

replaced.

TAKEUP

TENSION

AND

BACK

TENSION

DURING

REWIND

Instruments

Required:

Tension

Gauge,

Splicing

Tape

1.

In

order

to

measure

the

Takeup

Tension,

place

a

Tull

reel

of

7”

Tape

on

the

Supply

Reel

Table

and

place

the

set

into

the

Rewind

mode.

Then

measure

it

in

the

same

way

as

for

measurement

Takeup

Tension

during

Record/Playback.

2.

In

order

to

measure

the

Back

Tension,

place

a

Tull

reel

of

7”

Tape

on

the

Right

Reel

Table

and

place

the

set

into

the

Rewind

mode.

Then

measure

it

in

the

same

way

as

for

measurement

during

Record/Play-

back.

3.

Tekeup

Tension

and

Back

Tension

during

Rewind,

when

the

Tape

is

fully

wound

on

the

7”

Reel,

are

as

follows:

PAD

PRESSURE

An

excess

of

Pad

Pressure

exerts

a

subtle

influence

on

tape

speed

wow

and

flutter,

and

abrasion

of

head.

On

the

contrary,

too

low

pad

pressure

brings

about

bad

Mesuring

Method:

Instrument

Required:

Tension

Gauge

1.

Place

the

set

into

the

Playback

mode

without

loading

the

Tape.

2.

Apply

the

Tension

Gauge

to

the

center

of

the

Pad

and

move

the

Pad

away

from

the

Head

slowly.

Read

the

value

when

it

first

separates.

3.

The

standard

Pad

Pressure

is:

Pad

Pressure

during

Recording/Playback:

20~30

gr

Pad

Pressure

for

Erasing:

15~25

gr

Adjusting

Method:

Adjust

the

Pad

Spring

(in

order

to

increase

the

Pad

Pressure)

Takeup

Tension

during

Rewind:

more

than

100

gr

Back

Tension

during

Rewind:

5~12

gr

As

amatter

of

course,

the

Tape

Reel

must

be

of

the

maximum

diameter

applicable

to

the

set.

Adjusting

Method:

If

the

Takeup

Tension

is

too

low,

the

causes

might

be

either

low

Rewind

Belt

tension

insufficient

Rewind

Pulley

pressure,

lack

of

oil

on

the

Supply

Reel

Table

Shaft,

oil

on

the

Belt

and

the

Motor

Pulley,

etc.

It

the

Back

Tension

is

abnormal,

the

causes

might

be

either

that

the

Spring

under

the

Takeup

Reel

Table

Shaft

is

dirty

or

needs

oil.

A

nPaneneneeeu

penne

Deennennanssanepas

ee ne

nnnHeauananansrsounsneueuneuesunonsnanasaunRERaaDan

Denn

xUnuuaueraeesernanenens

contact

between

Head

and

Tape,

and

also

deteriorates

sensitivity

and

frequency

response.

Attention

should

therefore

be

paid

to

this

Pad

Pressure.

(Tape

Pad)

Pad

Pull

it

t

upward

ay

Bend

it

\

Pad

Spring

(In

order

to

lower

the

Pad

Pressure)

Pull

it

downward

Fig.

13

HEAD

ADJUSTMENTS

ADJUSTING

ORDER

Head

Height

|

Sus

|

Playback

Head

Azimath

|

4

|

Record

Head

Azimath

HEAD

HEIGHT

Erase

Record/Playback

Head

Slit

for

;

0.015~0.24

(0~0.01)

+0

6.25

——»

(6.22)

Tape

Guide

3

(HET)

@

o

Fig.

15

1.

Regarding

the

rerative

positions

of

Head

and

Tape,

the

Record

and

Playback

Heads

so

that

they

become

the

Erase

Head

Core

should

be

so

adjusted

as

to

ca.

O~0.01

interior

from

the

tape.

come

out

about

0.015~0.24mm

from

the

Tape.

2.

The

adjustments

are

effected

with

Screws

@~®@.

This

is

usually

conducted

by

use

of

transparent

tape

The

Screw

@

should

be

mainly

used

for

the

purpose.

and

observing

with

the

named

eye.

Likewise

adjust

AZIMATH

ADJUSTMENT

PLAYBACK

HEAD

1;

Connect

a

VTVM

to

the

LINE

OUT

terminal

of

each

channel.

.

By

using

an

Angle

Adjusting

Standard

Tape

(7-1/2

ips,

7

kHz),

playback

7

KHz

signals

at

7-1/2

ips

tape

speed

and

turn

the

Adjusting

Screws

@

and

@

shown

in

Fig.

15

so

that

the

max.

output

is

obtained

at

both

channels.

In

case

it

is

difficult

to

adjust

the

slit

angle

between

CH-1

and

CH-2,

seek

for

the

middle

point.

(The

measuring

circuit

is

shown

in

Fig.

16)

RECORD

HEAD

AS

Adjust

its

angle

after

adjusting

the

Playback

Head

Angle.

.

Connect

a

Standard

Oscillator

to

the

AUX

IN

terminal

of

each

channel

and

a

VTVM

to

the

LINE

OUT

terminal.

.

Keep

the

oscillation

frequency

at

15~20kHz

and

the

recording

level

lower

by

10

dB

than

the

standard

recording

level,

and

place

the

unit

in

the

RECORD

mode.

.

Record

the

specified

signal

with

the

Record

Head

while

playing

it

back

with

the

Playback

Head,

and

Playback

Amplifier

adjust

the

Record

Head

Adjusting

Screws

©

and

©

so

that

each

output

becomes

maximum.

NOTE:

At

this

time,

do

not

adjust

the

Playback

Head.

(The

measuring

circuit

is

shown

in

Fig.

17)

Cautions

in

Measurement:

Move

finely

the

Adjustment

Screws

@

and

©,

@®

and

@

alternately.

*

After

the

adjustment,

lock

the

screw

heads

with

lacquer.

Recording

Amplifier

Playback

\

b-—=

Amplifier}

(VTVM

AMPLIFIER

ADJUSTMENTS

After

adjusting

the

head,

adjust

the

amplifier

section

according

to

the

following

procedure,

and

then

adjust

the

overall

frequency

response

with

the

tape

speed

set

at

3-3/4

ips

and

then

again

at

15

ips.

Especially

when

the

head,

the

recording

equalizer/playback

equalizer

adjustment

volume

and

coil,

etc.

are

replaced,

make

the

general

adjustments

listed

below.

ADJUSTMENT

ORDER

Playback

Line

Out

Playback

Frequency

Oscillation

Frequency

Adjustment

Response

Adjustment

Measurement

Bias

Current

Erase

Current

Recording

Level

Adjustment

Measurement

Adjustment

Overall

Frequency

Overall

Frequency

Recording

Level

Response

Adjustment(1)

Response

Adjustment(2)

Adjustment

Recording

Monitor

Adjustment

VU

Meter

Adjustment

ANKUR

R

NEMEC

Nees

een

ERC

RENNER

NEESER

NOSE

UCN

MU

NESTE

ESEORONONUCU

UN

SHESSEEDERESeauenesSCEECESCCERCKUDCURSSSEREAEEUarsceunsENeoeHGDENOaedereussenscraranexenscausenessesenssencauecssecanvacucanssauessnuenncannvendecdcvcsensanecnreresse

PLAYBACK

LINE

OUTPUT

Playback

Head

Amplifier

Fig.

19

Instruments

required:

VTVM,

standard

tape

Playback

the

Ampex

standard

tape

with

a

max.

frequency

of

700

Hz

and

adjust

the

semi-fixed

volume

resistors

TAPE/SOURCE

selector

switch

set

to

TAPE.

ous

VR23

and

VR24

until

the

LINE-1

output

becomes

1

V.

(Set

the

speed

selector

knob

to

7-1/2

ips.)

Keep

the

10

PLAYBACK

FREQUENCY

RESPONSE

ADJUSTMENT

AT

7-1/2

ips,

3-3/4

ips

TAPE

SPEED

instruments

required:

VTVM,

Ampex

standard

tape

for

STANDARD:

100Hz~10

kHz

......

Deviation

3

dB

frequency

response

test.

50

Hz~12

kt

......

Deviation

5

dB

1.

Make

the

connections

shown

in

Fig.

19.

4.

Playback

the

Ampex

standard

tape

at

3-3/4

ips

tape

; j

he

high

frequency

response

(5

kHz

2.

Playback

the

Ampex

standard

tape

at

7-1/2

ips

tape

speed,

adjust

u

speed,

and

adjust

the

high

frequency

response

and

7.5

kHz)

with

VR17

(CH-1)

and

VR18

(CH-2),

(7.5

KHz,

10

kHz

and

12

kHz)

with

VR19

(CH-1)

and

VR20

(CH-2),

thereby

keeping

the

deviation’

within

3

dB.

thereby keeping

the

deviation

within

3

dB.

_

After

the

adjustment,

assure

that

the

following

con-

ditions

are

satisfied.

-

3.

After

the

adjustment,

assure

that

the

following

con-

STANDARD:

100

Hz~

5

kHz

......

Deviation

ditions

are

satisfied.

50

Hz~

12

kHz

......

Deviation

aD"

OSC

output

1V

constant

Fig.

20

Instruments

required:

VTVM,

oscillator,

attenuator

3.

Change

the

input

signal

to

10

kHz,

and

adjust

the

Due

to

lack

of

a

test

tape

for

15

ips,

adjust

the

fre-

attenuator

until

the

Line

Out

output

becomes

1

V.

quency

response

of

the

playback

amplifier

when

the

4.

Read

the

difference

between

the

attenuator

indica-

tape

speed

is

15

ips.

tions.

1.

Make

the

connections

shown

in

Fig.

20.

STANDARD:

10kHz

—11.5+0.5

dB

2.

Remove

the

playback

head,

supply

a

1

kHz

signal

to

(1

kHz

at

a

level

of

0

dB)

both

ends

of

the

amplifier

input

line,

and

adjust

the

5.

If

the

value

read

is

not

within

the

standard

range,

attenuator

until

the

Line

Out

output

becomes

1

V.

adjust

VR21

and

VR22.

At

this

time,

set

the

playback

volume

to

maximum.

WavencueneanneenhanAREUOOSMannennss

(RESUEESMOAEEM

REG

EEREAARARAMGRAAKRAAEAR

RESORT

SOMRAARAGEARORESERSEESURNOARERRO

MEAS

ADAORSEOAAGRAGSAKOACARERESORESAESREREDARESERSANARA

AOC

EDOENORKSAaanasaanaupannencausaanssaaasennannasaeanaananasauaenann

BIAS

OSCILLATOR

FREQUENCY

Record

Head

|

Fig.

21

Instruments

required:

Audio

frequency

oscillator,

oscil-

joscope,

100Q

resistor

1.

Remove

the

ground

lead

wire

connected

to

the

re-

cording

head,

and

attach

a

100Q.

resistor

in

series.

2.

Connect

the

AF

oscillator

and

the

oscilloscope

to

both

ends

of

the

100Q

resistor.

3.

Place

the

set

in

the

recording

mode.

4.

Adjust

the

audio

frequency

oscillator

to

obtain

the

frequency

of

bias

oscillation

which

will

be

noted

by

resonance.

5.

The

resonance

point

is

where

the

Lissajous’

figure

becomes

stationary,

and

the

oscillation

frequency

is

indicated

on

the

scale

of

the

audio

frequency

oscil-

lator.

6.

The

standard

oscillation

frequency

is

170~190

kHz.

BIAS

OSCILLATOR

CURRENT

&

BIAS

TRAP

ADJUSTMENT

Instruments

required:

VTVM,

10Q

resistor

1.

Remove

the

lead

wire

(which

is

on

ground

when

ADJUST

recording)

connected

to

the

recording

head,

and

attach

a

10Q,

resistor

in

series.

2.

Connect

a

VTVM

to

both

ends

of

the

109

re-

VR31,

VR32

(Record

Head

sistor,

and

measure

the

voltage.

OM

O14

Voltage

value

C121,

oR

Blas

current=

Resistance

value

(10.Q)

C122

3.

The

standard

bias

current

is

1.5~2.3

mA.

Record

Mode

100

|

VTVM

Fig.

22

ADJUST

TRIO

2SC644(RS)

TRI2

2SC828(RS)

BIAS

LEAKAGE

CHECK

Fig.

23

Adjustment

method:

1.

Place

the

unit

in

the

stereo

recording

mode

and

adjust

the

peaking

coils,

L5

and

L6,

to

minimize

bias

leakage.

(Check

points:

collector

terminals

of

Tr12

and

Tr25)

2.

Adjust

VR31

and

VR32

until

the

bias

current

shows

the

standard

value.

ov

pee

ane

psermnnnnsessaeeuanen

scene

sues

ee

RE

reuaunnebennee

Rees

eUEnSEE

SEER

SERSSENDSRER

SESS

DAM

ERS

PENA

SEER NEON

AR

NES

ESS

SPEER

READER

ES

SARE

HSE

EES

OES

ESESEN

EASE

ASME

NEON

AED

ERPS

ESSERE

SEERASSOUNSR

RAHN

NESE

ERE

ESEREODEDUNESOPE

EERE

RAARKNH

ENR

RANRER

EAE

ERASE

CURRENT

Instruments

required:

VTVM,

10Q

resistor.

1.

Remove

the

ground

lead

wire

connected

to

the

erase

head,

and

attach

a

10Q.

resistor

in

series.

2.

Connect

a

VTVM

to

both

ends

of

the

10Q.

re-

sistor,

and

measure

the

voltage

value.

|

Voltage

value

Resistance

value

(10Q)

3.

The

standard

erasing

current

is

55~75

mA.

Erase

current

=

Fig.

24

12

RECORDING

LEVEL

ADJUSTMENT

&

VU

METER

ADJUSTMENT

Recording

Playback

Amplifier

Fig.

25

Instruments

required:

Oscillator,

attenuator,

VTVM

VU

meter

adjustment:

Recording

level

adjustment:

1.

In

this

condition,

set

the

tape/source

selector

switch

recording

mode,

and

make

a

recording

by

supplying

meter

deflects

around

0

VU.

a

—20

cB

(1

kHz)

to

the

Aux-2

input

terminal.

Recording

monitor

level

adjustment:

2.

Set

the

tape/source

selector

switch

to

TAPE,

and

1.

Jn

the

same

condition

as

above,

move

the

selector

adjust

VRQ

(CH-1)

and

VR10

(CH-2)

until

the

output

switch

to

SOURCE

and

adjust

VR11

and

VR12

until

of

Line

Out-1

becomes

1.0

V.

the

output

of

Line

Out-1

becomes

1

V.

OVERALL

FREQUENCY

RESPONSE

ADJUSTMENT

(1)

Instruments

required:

Oscillator,

attenuator,

VTVM

(see

3-3/4

ips

60HZ~7.5

kHz

......

Deviation

3

dB

Fig.

25)

30

Hz~

12

kHz......

Deviation

5

dB

15

ips

100

Hz~

10

kHz

......

Deviation

3dB

30

Hz~

30

kHz

......

Deviation

10

dB

For

3-3/4

ips

tape

speed:

For

7-1/2

ips

tape

speed:

1.

Supply

an

input

signal

of

—35

dB

to

Aux-2,

and,

after

recording

and

playback,

re-adjust

the

bias

current

until

the

10

kHz

output

becomes

the

same

level

as

Record

30Hz~12

kHz

at

a

—35

dB

level

to

Aux-2

in

the

output

of

Line

Out-1

at

1

kHz.

(Adjustment

the

same

way

as

for

the

7-1/2

ips

tape

speed

adjust-

points:

VR31,

VR32)

ment,

and

adjust

VR13

and

VR14

until

the

frequency

response

during

playback

conforms

to

the

standard.

For

15

ips

tape

speed:

Record

30

Hz~30

kHz,

and

adjust

L3

and

L4

Gntil

the

frequency

response

during

playback

conforms

to

the

2.

Record

30

Hz

~

25

kHz

signals,

and

adjust

the

pea-

king

coils,

L1

and

L2,

until

the

frequency

response

during

playback

conforms

to

the

standard.

STANDARD

standard.

7-1/2

ips

200

Hz~

10

kHz

......

Deviation

3

dB

For

frequency

response

about

30

kHz,

adjust

VR15

and

30

Hz~

23

kt

......

Deviation

9

dB

VR16.

wun

sd

naeeaaunameemasenacenanasaventaneeaennnsanennenaransanasannnecncensnacananannesecaseneescanvensdadacersuarsnenaansdecsaeasanerensaanneessrnsenncesecerseseuasenenaccnnansseeaerennrensreeeecpseceanacenesuroausanensannsnasaeencasensaasans

RECORDING

LEVEL

RE-ADJUSTMENT

When

the

bias

current

is

adjusted

during

the

overall

frequency

response

adjustment,

re-adjust

the

recording

level.

13

A

CAUTIONS

WHEN

MOUNTING

HEAD

AFTER

REPLACEMENT

Record

head

Head

holding

screw.

Fig.

26

Playback

head

Pad

holding

screw

Please

read

the

following

very

carefully

before

adjusting

the

head

height

and

azimuth.

1.

Make

sure

that

the

tape

properly

contacts

the

head.

‘When

mounting

the

head

to

the

head

base

plate,

use

care

with

the

following:

1-1.

Position

relationship

between

the

head,

tape

and

pad:

1-2.

Mounted

head

angle

adjustments:

a)

Adjust

the

position

of

the

head

(recrod

head,

playback

head)

until

ZA

and

7B,

shown

in

Fig.

27,

and

equal.

ZA=

ZB

b)

The

felt

contacts,

the

pad

plate,

and

the

most

protruding

part

of

the

head

front

are

at

a

right

angle,

as

described

in

1-2

a

above,

and

in

the

surface

contact,

as

shown

in

Fig.

28.

Fig.

27

Proper

contact

Improper

contact

Fig.

28

14

15

2.

Electrical

confirmation

of

the

condition

of

the

mo-

unted

head:

Make

the

following

adjustments

in

addition

to

those

listed

in

the

mechanism

head

adjustment

spec-

ifications.

2-1.

If

the-head

output

voltage

exceeds

1

dB

when

the

pad

plate

is

pressed

in

the

direction

of

the

arrow,

as

shown

in

Fig.

29,

it

is

probable

that

the

mounted

head

angle

adjustments

(1-2

aand

b)

have

not

been

properly

made,

there

is

some

positioning

deviation

between

the

most

prot-

ruding.

part

of

the

head

front

and

the

slit.

If

the

cause

is

proven

to

be

the

first,

re-adjust

1-2

a

and

b:

and

if

it

is

the

second,

adjust

the

position

according

to

the

procedure

given

below.

a)

Loosen

the

head

holdiag

screw,

shown

in

Fig.

26,

move

the

head

to

the

right

or

the

left,

as

shown

in

Fig.

30

and,

when

the

play-

back

output

is

maximum,

determine

the

head

fixing

position.

Confirm

the

conditions

of

2-1.

(including

the

back/forth

adjustment)

ATL

U\r

@

[>

<\

Head

mounting

direction

adjustment

range

Fig.

30

b)

If

method

(a)

is

difficult

or

insufficient,

lo-

osen

the

pad

holding

screws,

shown

in

Fig.

26,

and

adjust

the

pad

by

moving

it

to

the

right

or

the

left,

as

shown

in

Fig.

31,

and

confirm

the

conditions

of

2-1.

(including

the

back/forth

adjustment)

(Press

it

by

hand

Fig.

29

Pad

mounting

direction

adjustment

range

Fig.

31

CUE

SWITCH

MOUNTING

POSITION

ADJUSTMENT

Adjustment:

1.

Stop

the

mechanism.

2.

Move

the

cue

switch

angle

in

the

direction

of

arrow

C.

3.

Move

the

cue

switch

until

part

A

contacts

the

cue

lever,

and

with

the

cue

switch

lever

pressed

in

at

the

right

end

of

the

cue

lever,

mount

the

cue

switch.

4.

After

mounting

the

switch,

place

the

unit

into

the

FF

or

REW

mode,

and

make

sure

that

there

is

an

interval

of

more

than

0.5

mm

between

the

right

end

of

the

cue

lever

and

the

cue

switch

lever

when

the

cue

lever

knob

is

fully

pressed

in

the

direction

of

arrow

(Operating

shaft)

Upper

base

plate

Fig.

32

Cue

switch

angle

Slide

switch

HOW

TO

CHANGE

TAPE

SPEED

When

changing

the

tape

speed,

do

so

in

the

following

order.

The

tape

speed

of

this

unit

can

be

changed

to

either

3-3/4

ips

or

7-1/2

ips

by

simply

moving

the

tape

speed

selector.

By

mounting

the

adaptor

(included),

the

unit

can

be

used

to

record

and

playback

at

15

ips.

(Be

sure

that

the

function

lever

is

in

the

STOP

position

before

changing

the

tape

speed.)

(1)

Set

the

tape

speed

selector

to

the

desired

position.

(2)

Set

the

equalizer

changeover

switch

to

the

desired

tape

speed

(same

as

(1)

above).

How

to

install

the

15

ips

adaptor:

For

15

ips

speed,

the

pressure

roller

and

capstan

for

15

ips

must

be

used

in

addition

to

items

(1)

and

(2)

above.

16

1.

Remove

the

capstan

screw

(small).

2.

Remove

the

screw

at

the

center

of

the

pressure

roller,

remove

the

pressure

roller

cap

(large),

fiber

washer

(thick),

the

pressure

roller

(large),

and

the

fiber

washer

(thin).

3.

Remove,

from

the

adaptor

compartment

at

the

rear

of

the

unit,

the

capstan

screw

(large),

the

capstan

sleeve,

the

pressure

roller

cap

(small)

and

the

pr-

essure

roller

(small).

4.

Insert

the

capstan

sleeve

onto

the

capstan

shaft

and

tighten

with

the

capstan

screw

(large).

5.

the

fiber

washer

(thin),

pressure

roller

(small),

as

well

as

the

fiber

washer

(thick)

and

pr-

essure

roller

cap

(small)

onto

the

pressure

roller

shaft.

By

following

steps

1~5

above,

and

then

setting

the

tapé

speed

selector

to

the

7-1/2

ips

position

and

the

equalizer

changeover

switch

to

the

15

ips

position,

the

unit

can

be

used

at

the

15

ips

tape

speed.

NOTE:

The

7-1/2

ips

speed

can

also

be

used,

without

changing

the

capstan,

etc.,

by

simply

setting

the

tape

speed

selector

to

the

3-3/4

ips

position

and

the

equalizer

changeover

switch

to

the

7-1/2

ips

position.

The

capstan

screw

(small),

the

pressure

roller

(large)

and

the

pressure

roller

cap

(large)

should

be

placed

in

the

adaptor

compartment

at

the

rear

of

the

unit.

§

To

change

from

15

ips

(B)

to

7-1/2

ips

and

3-3/4

ips

(A),

reverse

the

above

steps.

A

For

3-3/4

and

7-1/2

ips

ane

Screw

Ss

—t

large)

Fiber

eo

(thic

Pressure

roller

(large)

Capstan

screw—_]

(small)

4

Fiber

‘washer

(thin)

Capstan

shaft

lis

zy

Pressure

roller

cap_

Pressure

roller

shaft

B

For

15

(7-1/2)

ips

Capstan

screw

(large)

Capstan

Pu

Capstan

>

Screw

——

Pressure

roller

cap

(small)

Fiber

washer

(thick)

Pressure

roller

iI)

pe

washer

Pressure

roller

shaft

ene,

Tape

Speed

Selector

TAPE

SPEED

3-3/4

ips

"3-3/4"

Installation

of

Pressure

Roller

and

Capstan

Equalizer

Changeover

Switch

"3.3/4"

“7-1/2”

"TAjoe

7-1/2

ips

"3-3/4"

a

eo

“7.4

/2"

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Panasonic RS-736US User manual

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