Sharp Gf-9090h User manual

GF-9090H.HB

GF-9090E

Manual

@

APSS

Auto

Program

Search

System

MODEL

GF-9O09OH

sinver

Panes

GF-9O90B#B

eeiack

Pane!

GF-9090E

In

the

interests

of

user-safety

the

set

should

be

restored

to

its

original

condition

and

only

parts

identical

to

those

specified

be

used.

SPECIFICATIONS

GENERAL

Type:

Power

source:

Power

consumption:

Speaker:

Power

output:

Semiconductors:

Dimensions:

Weight:

Input

terminals:

Output

terminals:

Portable

stereophonic

cassette

tape

re-

corder

with

built-in

LW/MW/SW/FM

4-band

radio

AC

110/220/240V,

50/60

Hz(H,

HB)

AC

240V,

50/60

Hz

(E)

DC

12V

(Eight

UM/SUM-1

batteries

or

External

DC

supply)

24

watts

16cm

(Woofer)

x

2,

Horn

type

(Twee-

ter)

x

2

MPO

8000

mW

(DIN

45

324)

(H,

HB)

MPO

11W

(E):

AC

operation

RMS

power

7000

mW

(3500

mW

+

3500

mW:

DC

operation)

5-IC

(Integrated

Circuit),

47-transistor

and

37-diode

(4

Light

Emitting

Diode)

485mm(W)

x

115mm(D)

x

240mm(H)

5.8

kg

(without

batteries)

EXT.

MIC.

600

ohms

(J201,

J202)

Remote

control

(J302)

EXT.

DC

power,

12V

(J701)

AC

input

power

(SO701)

REC/PB

DIN

socket,

2.5

mV/10K

ohms

(SO202)

FM

EXT.

Antenna

(SO1)

EXT.

speaker,

4

~

8-ohms

(SO301,

$0302)

PHONES

:

4

~~

8

ohms

(J301)

REC/PB

DIN

-

socket,

1V/50K

ohms

(SO202)

=O

MAPWNH

WN

TAPE

RECORDER

SECTION

Type:

Tape:

Tape

speed:

Recording

system:

Erasing

system:

Recording

time:

Fast

forward

or

rewind

time:

Frequency

response:

Wow

and

flutter:

S/N

ratio:

RADIO

SECTION

Frequency

range:

Intermediate

frequency:

Circuit

system:

Antenna:

4-track

stereo

cassette

tape

recorder

Philips

type

compact

cassette

tape

4.8

cm/sec.

AC

bias

DC

erasing

60

minutes

(with

C-60

tape)

120

sec.

(with

C-60

tape)

40

~

15,000

Hz

(CrO2

tape)

40

~

12,000

Hz

(Normal

tape)

0.3%

(DIN

45

511)

(H,

HB)

0.15%

(WRMS)

(E)

dB

50

LW

150

~

285

kHz

MW

520

~

1,620

kHz

SW

5.95

~

18

MHz

FM

87.6

~

108

MHz

LW/MW/SW

455

kHz

FM

10.7

MHz

4-band

superheterodyne

system

LW/MW

ferrite

core

bar

antenna

SW/FM

telescopic

antenna

FM

EXT.

antenna

SHARP

CORPORATION

OSAKA,

JAPAN

NAMES

OF

PARTS

(Refer

to

Figure

1)

Record

key

Rewind/Review

key

Playback

key

Eject

key

Fast

forward/Cue

key

ae

st

——

Function

selector

switch

Editor

switch

FM

muting

switch

Pause

key

—__----—~

AFC

switch

FM/SW

rod

antenna

Band

selector

switch

Meter

ial/Mete:

:

Dial/Meter

selector

switch

light

switch

Record

level

control

(L-ch}

(R-ch}

Loudness

switch

Stop

key

Bass

control

ALC/Manual

switch

Treble

control

Forward

Reverse

——_————

Equalizer

selector

switch

APSS

key

APSS

key

Balance

control

Bias

selector

switch

Volume

control

——..———-.

a

Mode

selector

switch

Tuning/R-ch

record

_

a

:

a

=

FM

stereo

indicator

and

playback

level

meter

Z|

Battery

condition/L-ch

record

and

playback

tevel

meter

~

|

r 7

-

--——

APSS

indicator

—

Tuning

control

Built-in

i

Built-in

microphone

preeenste

i

(R-ch)

PULL

ARO

STOP

Digital

tape

counter

Headphone

jack

|

a

-——

Cassette

holder

Remote

control

jack

External

microphone

jack

Mains

RIF

socket

Record/Play

back

switch

socket

(DIN)

External

x

DC

jack

Battery

compartment

lid

I

_____

Mains

voltage

selector

switch

(GF-9090H,HB)

Mains

Power

switch

(GF-9090E)

FM

external

antenna

socket

—

|

aan

External

speaker

socket

(R-ch)

(L-ch}

Figure

1

DISASSEMBLY

OPERATION

ON

MAINS

A->|BE={C

{DFE

|

GF-9090H,

HB

™

Before

operating

the

unit

on

mains,

check

the

pre-set

[A]

FRONT

CABINET

REMOVAL

(Refer

to

Figures

2

and

3)

1.

Pull

out

the

power

cord

plug

or

adaptor

plug

from

the

unit.

2.

Take

out

the

cassette

tape

from

the

cassette

holder.

3.

Remove

the

battery

compartment

lid

and

eight

(8)

bat-

teries

from

the

battery

compartment.

.

Remove

eight

(8)

screws

retaining

the

front

cabinet.

5.

Gently

pull

out

the

front

cabinet

and

disconnect

four

(4)

tips

(Speaker)

connected

to

the

main

P.W.

board.

-

voltage.

If

the

voltage

is

different

from

your

local

voltage,

adjust

the

voltage

as

follows:

Rotate

the

plug

of

the

voltage

selector

by

using

a

screwdriver

so

that

your

local

voltage

number

can

be

seen.

(Refer

to

Figure

6)

GF-9090E

Switch

the

mains

power

switch

to

the

“ON”

position.

®

When

the

unit

is

used

on

batteries,

pull

out

the

mains

B|

OPERATION

PANEL

REMOVAL

(Refer

to

Figure

2)

plug

from

the

unit.

Otherwise

switch

off

at

the

mains

SWITGh

1.

Remove

the

front

cabinet

as

described

in

front

cabinet

power

switch

after

use.

(Refer

to

Figure

6)

GF-

9090E

removal.

Figure

2

Figure

6

2.

Remove

six

(6)

knobs

(VOLUME,

BALANCE,

TREBLE,

DIAL

CORD

STRINGING

(Refer

to

Figure

7)

BASS

and

RECORD).

|

.

Remove

four

(4)

screws

retaining

the

operation

panel.

4.

Gently

lift

up

the

operation

panel

from

the

back

cabinet.

Ww

[(C]

DIAL

SCALE PLATE

REMOVAL

(Refer

to

Figure

3)

1.

Remove

the

operation

panel

as

described

in

operation

panel

removal.

2.

Remove

four

(4)

screws

retaining

the

dial

scale

plate.

3.

Gently

pull

out

the

dial

scale

plate

from

the

chassis.

DIAL

POINTER

PULLEY

[D]

MECHANISM

BLOCK

REMOVAL

(Refer

to

Figure

4)

1.

Remove

the

dial

scale

plate

as

described

in

dial

scale

plate

removal.

2.

Disconnect

the

tip

(Muting)

and

two

(2)

sockets

(SO2,

$0501)

connected

to

the

main

P.W.

board

and

the

motor

P.W.

board.

3.

Remove

four

(4)

screws

retaining

the

mechanism

block.

4.

Gently

pull

out

the

mechanism

block

form

the

back

cabinet.

PULLEY

[E]

CHASSIS

(P.W.B.)

REMOVAL

(Refer

to

Figure

5)

1.

Remove

the

mechanism

block

as

described

in

mechanism

block

removal.

2.

Remove

the

tuning

knob from

the

tuning

shaft.

3.

Disconnect

two

(2)

tips

(Antenna)

connected

to

the

main

TUNING

SHAFT

P.W.

board.

4.

Remove

six

(6)

screws

retaining

the

chassis

(P.W.B.).

5.

Gently

pull

out

the

chassis

(P.W.B.)

from

the

back

cabinet.

enWs

Li)

OY)

Ay

_———/

Zo

ae

=

a

Figure

5

Figure

7

DESCRIPTION

OF

APSS

is

the

abbreviation

of

Automatic

Program

Search

System

that

permits

advancing

the

tape

past

an

unwanted

selection

to

the

beginning

of

the

automati-

cally

with

one

push

of

a

key.

In

this

machine,

the

APSS

in

the

reverse

direction

is

also

realized

besides

that

in

the

forward

play.

That

is

to

say,

this

unit

is

equipped

FWD.-

APSS

key

(

<q

)

and

REV.-APSS

key

(

p>

).

In

playback

mode

when

the

FWD.-APSS

key

is

depressed

the

tape

is

fed

at

a

high

speed

and

is

slowed

down

to

a

regular

play

speed

at

the

beginning

of

the

Or,

when

the

REV.-APSS

key

is

depressed

the

tape

is

rewound

at

a

high

speed

and

is

set

to

regular

playback

mode

at

the

beginning

of

the

selected

program.

The

following

explana-

tion

refers

to

the

function

of

the

APSS.

FUNCTION

OF

APSS

When

the

FWD.-APSS

key

is

depressed

in

playback

mode

of

the

tape,

the

pinch

roller

is

cleared

from

the

flywheel

shaft

and

the

roller

assembly

meshes

with

the

gear

of

the

take-up

turntable

permitting

the

tape

to

advance

at

a

normal

fast

forward

speed.

On

the

other

hand,

when

the

@)

APSS

INDICATOR

CIRCUIT

(Refer

to

Figures

8,

9,

10

and

11)

With

the

APSS

indicator

circuit

being

given

+12V

power,

the

multi-vibrator

(Q502

and

Q501)

starts

to

oscillate

to

n

Hz

(about

2

Hz)

and

output

of

the

multi-vibrator

will

be

applied

to

the

flip-flop

circuit

(Q503

and

Q504)

to

be

1/2

divided

into

1/2n

Hz

(about

1

Hz).

These

outputs

of

the

multi-vibrator

and

flip-flop

circuit

are

to

light

up

the

light

emitting

diodes

DS13,

D512

and

D511

through

the

logical

circuit

(D501

to

D506).

Figure

10

is

a

timing

chart

concerning

the

above

operation.

In

Figure

10,

1)

and

2)

are

output

waveformes

of

the

multi-vibrator

(Q502

and

Q501),

and

3)

and

4)

are

those

of

the

flip-flop

circuit

(Q503

and

Q504).

Using

these

four

(4)

waveforms,

the

logical

circuit

is

to

further

create

waveforms

5),

6)

and

7)

to

have

the

light

emitting

diodes

light

up.

The

horizontal

axis

shown

in

Figure

10

refers

to

a

time

axis:

the

light

emitting

diodes

D513,

D512

and

D511

light

up

in

this

order

one

after

another,

respectively

at

the

periods

a,

b

and

c.

Meanwhile,

at

the

period

d,

all

the

light

emitting

diodes

are

kept

off.

The

periods

a

to

d

are

considered

one

cycle

of

the

light-up

operation

and

this

cycle

is

repeated:

the

light-up

operation

looks

as

if

it

moved

from

right

to

left.

Q505

and

Q506

are

switching

transistors.

When

the

FWD.-APSS

key

is

depressed,

the

Q505

will

be

turned

“ON”

while

the

Q506

will

do

so

when

the

REV.-APSS

key

is

depressed.

As

for

the

REV.-APSS

operation

mode,

the

light

emitting

diodes

D511,

D512

and

D513

light

up

in

this

order

one

after

another,

respectively

at

the

periods

a,

b

and

c

---

the

light-up

operation

looks

as

if

it

moved

from

left

to

right.

FWD.-APSS

key

is

depressed,

the

FWD.-APSS

switch

(SWSO1)

is

turned

“ON”

so

that

+12V

power

be

applied,

via

D509,

to

the

APSS

indicator

circuit

1)

,

muting

circuit

(2)

and

APSS

detection

circuit

@.

Playback

key

Record

key

Fast

forward

Rewind/

/Cue

key

mm.

Review

key

Pause

key

Eject

key

Forward

Reverse

APSS

key

APSS

key

(FWD-APSS)

(REV-APSS}

Stop

key

Figure

8

FUNCTION

KEY

LAYOUT

Q501~9506

ascassic)

ALY

APSS

INOKATOR,

Figure9

APSS

INDICATOR

CIRCUIT

APSS

INDICATOR

PERIOD

jee

NUE

PLLA

[

a

|

r

1

3)

$03

COLLECTOR

|

4).

0604

COLLECTOR

2)

@502

COLLECTOR

[]

I,

Sl

ie

oe

[ee

a

ce

ie

T

Telolelalelelelalalvlel

Tale

le {time

0511,0512

and

D513

OFF

Period

O5I1

ON

Period

OSI2

ON

Period

‘$13.

ON

Period

5)

D511

ANODE

Zam

pee

te

t

6)

0512

ANODE

7)

DS5t3

|

ANODE

ota

|

1

OOHOHORY

LEFT

RIGHT

Figure

10

FWD-APSS

IND.

TIMING

CHART

(2)

MUTING

CIRCUIT

(Refer

to

Figure

12)

The

current

fed

to

the

muting

circuit

turns

“ON”

the

muting

transistor

(Q302

and

Q305)

and

attenuates

the

signal

from

head

to

hold

back

the

monitor

noise.

APSS

DETECTION

CIRCUIT

(Refer

to

Figures

13,

14

and

15)

The

current

fed

to

the

APSS

detection

circuit

drives

the

tape

playback

signal

given

from

the

record/playback

head

into

the

APSS

pre-amp

(IC401)

through

the

equalizer

amp

(Q201

to

Q204)

and

APSS

mixer

(Q205),

turning

“ON”

the

Q401,

and

now

the

signal

is

amplified

to

exceed

VBE

(voltage

between

base

and

emitter)

and

charges

the

C406

up

to

+12

volts.

Next,

when

the

Q402

is

turned

“ON”,

the

Q403

is

turned

“OFF”,

and

the

potential

of

the

Q403

collector

stabi-

lizes

at

+12

volts.

Therefore

the

Q404

is

not

turned

“ON”,

in

consequence,

neither

is

the

Q405.

As

a

result,

the

plunger

is

not

actuated.

In

other

words,

as

far

as

the

tape

carries

signals

the

plunger

does

not

work,

that

is,

the

tape

is

continuously

fast

forwarded

according

to

the

mechanism

of

the

APSS.

Meanwhile,

when

there

is

no

signal

on

the

tape,

the

potential,

even

if

amplified

by

the

equalizer

amp

(Q201

to

Q204)

and

APSS

pre-amp

(IC401),

becomes

lower

than

VBE

of

Q401,

which,

therefore,

is

turned

“OFF”,

and

the

electric

charge

of

C406

(determined

by

the

value

of

R405

and

C406)

is

discharged

at

the

time

constant.

When

the

potential

of

C406

is

discharged

to

be

below

VBE

of

Q402,

the

Q402

is

turned

“OFF”

and

the

Q403

is

activated.

Therefore,

the

collector

potential

of

Q403

becomes

zero

(0)

volt

and,

consequently,

the

+12-

volt

voltage

passes

through

the

R412,

allowing

a

discharge

current

to

flow

towards

the

C407.

By

this

discharge

current

the

potential

of

the

Q404

base

drops

momentarily

to

zero

(0)

volt,

and

the

Q404

is

turned

“ON”.

tees

REV-APSS

APSS

INDICATOR

PERIOD

an

h

+)

Q501

COLLECTOR

|

MULTI-VIBRATOR]

rer

2)

0502

COLLECTOR

LI

LU

[|

padi

oe

ty

=

3)

9803

COLLECTOR

LL

—j

LN

FLIP-FLOP.

m

r

4)

Q504

COLLECTOR

_

To

5)

DSi!

ANODE

]

[|

sa

6)

D512

ANODE

|

[

]

—4$

7)

DSI3

ANODE

[|

‘|

i

F

4h;

[

Tololelalalefelatalele!

lalele|

time

--4a-,

|

DSI1,DSI2

ond

DSIS

OFF

Period

Gb)

REV)

D513

ON

Period

LEFT

RIGHT

DSI2

ON

Period

DSII

ON

Period

Figure

11

REV-APSS

IND.

TIMING

CHART

Q301,Q304

2S8C373

DIN

AMP

Q302,Q305

2SC372(Y)

MUTING

Roch

C302

R308

10/16V

wK

BUFFER

PRE.

AMP.

ae

AMP.

APSS

DET.

CIRCUIT

GROUND

°

V

R/P

SWITCH

(SW2OI-K,1)

Figure

12

MUTING

CIRCUIT

{L602)

Q201,Q203

2SCIG82IGR)

EQ

AMR:

Ra);

0202,0204

te,

>

gurren

RECORD/PLAY

BACK

Seat

HEAD

c204

APSS

DET.

CIRCUIT

28C373

MIXER

{>

BUFFER

AMP.

DOIN

SOCKET

(so202)

{L603}

Ae

Figure

13

EQ

AMP.

Accordingly,

the

potential

of

the

C407

is

permitted

to

be

stabilized

from

zero

(0)

volt

to

+12

volts.

When

the

potential

exceeds

VBE,

the

Q404

is

turned

“OFF”.

Then

the

Q404

is

turned

“ON”’,

and

+B

is

supplied

to

the

base

of

Q405

through

the

R414,

turning

“ON”

the

Q405.

Then,

an

end

of

the

plunger

is

grounded

and

+12V

is

applied

to

the

plunger,

which,

in

turn,

is

actuated.

When

the

Q404

is

turned

“OFF”,

the

Q405

is

also

turned

“OFF”’,

cutting

off

the

potential

to

the

plunger.

When

the

plunger

is

put

in

action,

the

APSS

lockplate

is

stretched

out

to

release

the

FWD-APSS

key.

Consequently,

the

FWD-APSS

switch

(SW501)

is

turned

“OFF”

and

the

pinch

roller

is

pressed

hard

against

the

flywheel

shaft.

Moreover,

the

fastforwarding

gear

is

disengaged

from

the

gear

of

the

takeup

turntable,

setting

the

unit

in

normal

playback

mode

again.

As

the

FWD-APSS

switch

(SW501)

is

turned

“OFF”,

the

light

emitting

diodes

of

D513,

D512

and

D511

stops

flickering

and

the

APSS

limiter

circuit

is

made

inactive.

Further,

the

muting

circuit

of

Q302

and

Q305

also

stops

its

function.

In

the

meantime,

when

the

REV-APSS

key

is

depressed

the

fast-forwarding

gear

meshes

with

the

gear

of

supply

turntable

and

the

REV-APSS

switch

(SW502)

is

turned

“ON”

to

set

the

tape

in

rewind

mode,

permitting

the

light

emitting

diodes

of

D511,

D512

and

D513

to

flicker.

The

successive

function

is

just

as

in

the

case

of

FWD-APSS

behavior.

This

ends

the

explanation

of

the

APSS

performance.

However,

that

the

APSS

may

malfunction

when

either

one

of

following

recordings

is

played

back,

but,

remember,

this

is

not

a

trouble.

1.

2:

a

A

prolonged

portion

of

pianissimo

in

music.

A

blank

portion

in

the

midst

of

music

(more

than

3

seconds

when

measured

in

playback).

*

In

cases

1

&

2

the

FWD-APSS

or

REV-APSS

key,

if

depressed,

resets

itself

and

regular

playback

mode

is

resumed.

.

A

too

short

interval

between

programs

(about

1

second

when

measured

in

playback).

.

Anoisy

hum

or

buzz

recorded

in

a

blank

portion.

*

In

cases

3

&

4

the

condition

doesn’t

allow

the

APSS

circuit

to

work

easily,

and

the

blank

portion

couldn’t

be

detected.

.

FWD-APSS

key

depressed

within

10

seconds

(as

measured

in

playback)

from

the

end

of

a

preceding

selection.

.

REV-APSS

key

depressed

within

10

seconds

(as

meas-

ured

in

playback)

from

the

beginning

of

a

selection.

*

In

cases

5

&

6

the

tape

runs

10

or

30

times

as

fast

as

in

playback

mode

if

the

FWD-APSS

or

REV-APSS

key

is

depressed,

therefore

the

tape

skips

a

blank

portion

while

the

key

is

being

depressed.

APSS

MIXER

MUTING

CIRCUIT

[—————~1

APSS

IND.

CIRCUIT

I+12V

f——>

PLUNGER

({SOLSOI)

R401

sepa

15K

c4or

022(Z)

\C

-40]

RH-IXO408AFZZ

Po

R40:

age

|

ex

|

Binh

2

47K

ve

©.

+

C406

04

3.3/50V(M

OMP

A

02

)

©

GROUND

Q401

2SA495(Y)

Q402,Q403

2SC372Y(Y)

Q404

2SA495(Y)

SWITCHING

Q405

2SD468(C)

PLUNGER

DRIV.

Figure

14

APSS

DETECTION

CIRCUIT

[mee

APSS

SW

sw501

|FwD.

APSS

Sw

(REV

aPSS

SW)

ON

(Sw502)|

(REV.

APSS_

SW)

OFF.

Voss

a

_

BLANK

<.

MUSIC

A

SECTION

MUSK

B

H

EQUALIZER

AMP.

(Q201-

0204)

|

]

APSS

MIXER(Q208)

| \

|

'

!

| |

APSS

PRE

AMP

(IC

401)

=e

|

TIME

CONSTANT

|

pT

(R408

,c406)

TERMINAL

os

|

VeE

VOLTAGE

|

we

:

nee

9401

=

(282L

econ}

1

Ve

|

rt

i

(

9402

)

I

COLLECTOR

|

ON

|

ne

|

Sees

OFF

|

(2403

)

:

COLLECTOR

|

=

fete

SS

fe

(sate

Laon)

i

!

it

1

=a

!

if

0403

(Vee)

! i

|

\

404(0N)}

|

!

OFF

T

tot

i

I

!

t

]

|

OFF

i

'

I

!

¥

i

TAPE

Hi

1

!

NORMAL

SPEED

|

x

10~

30

are

:

I

Refer

to

Figures

10,1!

(

0404

)

COLL

ECTOR

PLUNGER

KE

APSS

IND.

LAMP

(LEO)

Figure

715

APSS

MOVEMENT

PRINCIPLE

MECHANICAL

ADJUSTMENT

=

PLAY

ADJUSTMENT

OF

FLYWHEEL

SHAFT

THRUST

+.

(Refer

to

Figure

16)

1.

Slowly

rotate

the

flywheel

shaft

thrust

play

adjusting

screw

clockwise

until

there

will

be

no

thrust

play.

2.

Next,

rotate

the

thrust

play

adjusting

screw

about

1/4

of

its

full

turn

counter

clokwise.

(Since

1

pitch

of

the

adjusting

screw

refers

to

0.8

mm,

the

thrust

play

thus

created

becomes

0.1

mm

to

0.3

mm.)

ADJUSTMENT

SCREW

Ol

mm

0.3mm

FLYWHEEL

Figure

16

@

PINCH

ROLLER

PRESSURE

ADJUSTMENT

(Refer

to

Figure

17)

1.

Set

the

unit

in

PLAY

mode.

2.

Push

the

point

@

with

use

of

tension

gauge

(0

gr.

to

500

gr.)

to

make

the

pinch

roller

apart

from

the

fly-

wheel

shaft.

Then,

check

that

the

tension

gauge

will

read

300

gr.

to

400

gr.

when

the

pinch

roller

stops

to

rotate.

.

As

a

result

of

the

check

in

the

step

2

above,

if

the

reading

is

found

outside

the

range

of

300

gr.

to

400

gr.,

adjust

the

pressure

spring

of

pinch

roller

by

bending

it

or

replace.

WwW

PRESSURE

SPRING

Figure

17

@

OPERATION

CHECK

OF

FWD-APSS

AND

REV-APSS

MECHANISMS

(Refer

to

Figures

42

and

43,

Page

29

and

30)

Under

PLAY

mode,

slowly

push

the

FWD-APSS

key

or

REV-APSS

key

to

make

sure

that

the

pinch

roller

(090)

and

the

take-up

idler

(028)

come

off

respectively

from

the

flywheel

shaft

and

the

take-up

turntable

support

(081),

and

simultaneously

the

sub-chassis

(011)

moves

1

mm

to

1.5

mm,

and

further

that

thereafter,

the

roller

assembly

(089)

is

pressed

against

the

take-up

turntable

support

(081)

or

the

supply

turntable

support

(082).

Moreover,

when

the

FWD-APSS

key

or

REV-APSS

key

is

released

by

pushing

the

FF

(CUE)

key

or

the

REWIND

(REVIEW)

key,

make

ascertain

that

the

sub-chassis

(011)

is

reset

and

the

unit

gets

in

PLAY

mode.

=

TORQUE

MEASUREMENT

AT

PLAY,

FF

AND

REWIND

MODES

(Refer

to

Figure

18)

1.

Mount

a

torque

measuring

reel

on

the

reel

support

(that

is,

it is

placed

on

the

take-up

turntable

support

at

PLAY/

REWIND

mode

while

on

the

supply

turntable

support

at

REWIND

mode).

2.

Then

gradually

release

the

tension

gauge

and

read

it

when

the

rotational

speed

of

the

reel

support

becomes

almost

constant.

3.

Measured

torques

at

each

mode

should

be

as

tabulated

below.

Note:When

the

take-up

turntable

support

is

stopped

at

PLAY

mode,

there

should

be

no

slip

between

the

take-up

turntable

support

and

take-up

slip

roller

and/or

between

the

drive

belt

and

take-up

slip

roller.

TURN

TABLE

MEASURING

—__20(25/32")

REEL

TENSION

GAUGE

MEASURED

TORQUE

35~

60

gr.cm

70

~

100

gr.cm

70

~

100

gr.cm

REWIND

Figure

18

=

GAP

ADJUSTMENT

BETWEEN

MOTOR

SWITCH

AND

BRAKE

LEVER

(Refer

to

Figure

19)

1.

Under

each

of

PLAY,

FF,

and

REWIND

modes,

make

ascertain

that

the

motor

switch

(SW504)

is

turned

“ON”

without

fail.

2.

When

the

motor

is

in

a

stop,

check

that

the

gap

(A)

between

the

brake

lever

and

the

motor

switch

(SW504)

is

2

mm

to

3

mm.

3.

If

the

steps

1

and

2

above

are

still

insufficient

for

the

adjustment,

the

gap

can

be

adjusted

by

positionally

changing

the

two

soldered

terminals

of

motor

switch

(SW504)

located

at

the

motor

PWB

with

use

of

a

soldering

iron.

MOTOR

SWITCH

(SW504)

__

BRAKE

LEVER

OPERATION

CHECK

OF

PAUSE

MECHANISM

(Refer

to

Figure

42,

Page

29)

Set

the

unit

in

PLAY

mode

by

pushing

the

key

given

a

mark

(

<q

).

Then

slowly

push

the

PAUSE

key

and

make

ascertain

that

the

take-up

idler

(028)

and

the

pinch

roller

(090)

come

off

respectively

from

the

take-up

turntable

support

(081)

and

the

flywheel

shaft

almost

at

the

same

time

and

check

that

each

of

the

two

gaps

thus

produced

is

about

0.5

mm.

TURNTABLE

Figure

19

@

ADJUSTMENT

OF

PLUNGER

SETTING

POSITION

(Refer

to

Figure

20)

1.

Under

FF

mode,

loosen

the

plunger

retaining

screw,

hold

up

the

part

@)

of

the

plunger

by

hand

and

while

keeping

the

plunger

in

contact

with

the

lock

shaft,

retighten

the

plunger

retaining

screw.

2.

After

the

step

1,

make

sure

of

the

following.

«Check

that

each

of

the

PLAY,

FF

(CUE),

REWIND

(REVIEW)

keys

can

be

locked

smoothly.

-

Check

that

the

FWD-APSS

key

and

REV-APSS

key

can

be

locked

smoothly

and

they

further

be

released

when

the

plunger

operates.

-

Check

that

the

plunger

can

start

to

operate

smoothly

when

the

STOP

key

is

pushed

to

release

the

APSS

keys.

3.

After

the

step

2,

the

adjustments

are

not

yet

sufficient,

again

carry

out

the

step

1.

PLUNGER

ADJUST

SCREW

LOCK

SHAFT

PLUNGER

_

Figure

20

10

ELECTRICAL

MEASUREMENT

*

This

unit

operaters

on

DC

12

V.

Check

that

the

power

*

Refer

to

Figure

35.

supply

is

exactly

12

V

before

measurement.

*

Set

the

FUNCTION

switch

(SW101G)

to

“TAPE”

position.

m

RECORD

OSCILLATOR

BIAS

CURRENT

AND

BIAS

FREQUENCY

ADJUSTMENT

(Refer

to

Figure

21)

1.

Connect

the

V.T.V.M.

across

the

100

ohm

resistor

5.

As

a

result

of

the

check

in

the

step

5

above,

if

the

(R201,

R202).

reading

is

found

outside

the

53

+

1

kHz,

adjust

the

2.

Place

the

unit

in

RECORD

mode.

bias

oscillation

coil

(L601)

3.

Adjust

the

semi-variable

resistores

(VR601,

VR602)

6.

After

the

step

5,

again

make

sure

of

the

bias

current.

so

that

the

V.T.V.M.

reads

50

mV

for

the

right

channel

(R201)

and

left

channel

(R202)

respectively.

4.

Make

sure

the

record

oscillator

bias

frequency

is

53

+

1

kHz.

POSITION

A

NORMAL

AC

V.TV.M.

FREQUENCY

COUNTER

GROUND

Figure

21

m

ERASE

CURRENT

CHECK

(Refer

to

Figure

22)

1.

Connect

the

V.T.V.M.

across

the

1

ohm

resistor

(R603).

2.

Place

the

unit

in

RECORD

mode.

3.

Make

sure

the

erase

current

is

90+

20

mV.

SWITCH

POSITION

BIAS

(SW602)

NORMAL

ERASE

HEAD

AC

V.TV.M,

RECORD

mode

Figure

22

11

m

RECORD

AMPLIFIER

SENSITIVITY

CHECK

(Refer

to

Figure

23)

1.

Connect

the

V.T.V.M.

across

the

100

ohm

resistors

4.

Place

the

unit

in

RECORD

mode.

(R201,

R202).

5.

If

the

record

amplifier

sensitivity

is

normal,

the

2.

Short

circuit

the

primary

coil

of

the

oscillation

reading

on

V.T.V.M.

should

be

approximately

coil

(L601)

to

stop

bias

oscillator.

1.75

mV.

3.

Connect

the

signal

generator

to

the

EXT.

MIC

jacks

(J201,

J202)

and

apply

signals

(1000

Hz,

—78

dB)

MODE

(SW303)

STEREO

to

the

unit.

SWITCH

POSITION

VR

CONTROL

|

POSITION

ALC/MANUAL

(SW202)

|

MANUAL

RECORD

(VR201)

|

EQ

Gw203)

NORMAL

RECORD

(VR202)

rarer

BIAS

(SW602)

NORMAL

R/P

HEAD

AC

V.T.V.M.

MIC

JACK

—--

RECORD

mode

ceeea

GENERATOR

(J201,J202)

-

STOP

BIAS

OSC.

-78dB

ATTENUATER

(0

dB

=

IV)

Figure

23

m

PLAYBACK

AMPLIFIER

SENSITIVITY

CHECK

(Refer

to

Figure

24)

1.

Connect

load

resistor

(4

ohm)

to

the

EXT.

SP

sockets

(SO301,

SO302)

and

further

connect

the

V.T.V.M.

3.

Place

the

unit

in

PLAYBACK

mode.

4.

If

the

playback

amplifier

sensitivity

is

normal,

the

thereto.

reading

on

the

V.T.V.M.

should

be

approximately

2.

Connect

the

signal

generator

across

the

REC/PB

0.5

V.

head

and

apply

signals

(1000

Hz,

—80

dB)

to

the

unit.

SWITCH

POSITION

EQ

(SW203)

MODE

(SW303)

STEREO

Mechanical

TREBLE

(VR302)

ee

Center

BASS

(VR303)

R/P

HEAD

AC

V.TV.M.

EXT.

SP

*

PLAYBACK

mode

(S030!

,302)

SIGNAL

GENERATOR

lOOOHz

-80dB

ATTENUATER

O

GROUND

(OdB

=

IV)

Figure

24

12

ws

SWING

ADJUSTMENT

OF

VU

METER

(Refer

to

Figures

23

and

25)

1.

Apply

signals

(1

kHz,

—60

dB)

to

the

EXT.

MIC

jacks

(J201,

J202).

2.

Adjust

the

record

volume

controls

(VR201,

VR202)

so

that

the

V.T.V.M.

reads

3.5

mV.

3.

Rotate

the

semi-variable

resistors

(VR305,

VR306)

to

adjust

so

that

each

of

the

two

VU

meters

(ME1,

ME2)

indicates

around

“0”

VU

and

swings

to

the

same

extent

in

right

and

left

of

the

position

‘‘0”

VU.

™

RECORD/PLAYBACK

HEAD

AZIMUTH

ADJUSTMENT

(Refer

to

Figure

26.)

1.

Connect

load

resistor

(4

ohm)

to

the

EXT.

SP

sockets

(SO301,

SO302)

and

connect

outputs

of

both

the

right

and

left

channels

to

the

vertical

and

horizontal

input

terminals

of

oscilloscope.

2.

Insert

the

test

tape

(MTT-114,

10

kHz,

—10

dB

Recorded).

3.

Place

the

unit

in

PLAYBACK

mode.

4.

Adjust

the

head

azimuth

adjusting

screw

so

that

Lissajou’s

waveform

attains

the

maximum

and

the

same

phase

in

right

and

left.

Figure

25

5.

Even

without

using

the

oscilloscope,

also

adjust

the

head

azimuth

adjusting

screw

so

that

outputs

of

both

the

right

and

left

channels

attain

the

maximum

and

the

same

phase

in

right

and

left,

and

as

a

result,

the

output

won’t

be

decreased

so

much

considerably

even

when

the

MODE

switch

(SW303)

is

set

to

“MONO”.

SWITCH

POSITION

MODE

(SW303)

|

STEREO

EXT.

SP

*PLAYBACK

mode

(SO302)

AC

V.T.V.M.

VR

CONTROL

VOLUME

(VR301)

TREBLE

(VR302)

BASS

(VR303)

POSITION

Maximum

Mechanical

Center

OSCILLOSCOPE

Figure

26

13

Should

it

become

necessary

at

any

time

to

check

the

alignment

of

this

receiver,

proceed

as

follows;

1.

Set

the

volume

control

(VR301)

to

maximum.

2.

Attenuate

the

signals

from

the

generator

enough

to

swing

the

most

sensitive

range

of

the

output

meter.

3.

Use

a

non-metallic

alignment

tool.

GENERAL

ALIGNMENT

INSTRUCTION

4.

Repeat

adjustments

to

insure

good

results.

5.

Set

the

position.

THE

INSTRUCTION

OF

FREQUENCY

ADJUSTMENT

(GF-9090H,

HB)

In

order

to

comply

with

FTZ

rule:

Nr.

358/1970,

please

fix

the

low

end

of

dial

frequency

(87.5MHz)

and

the

high

end

of

dial

frequency

(107.9MHz)

on

FM

band,

by

adjust-

FUNCTION

switch

(SW101G)

to

“RADIO”

ing

oscillation

coils

(L3

and

L4)

and

oscillation

trimmer

(TC4),

respectively,

as

illustrated

in

Fugure

35.

AM

ALIGNMENT

CHART

SIGNAL

GENERATOR

RECEIVER

t

CONNECTION

TO

RECEIVER

INPUT

SIGNAL

REQUENCY

DIAL

SETTING

REMARKS

(Refer

to

Figure

35)

ADJUSTMENT

Refer

to

Figure

27

Band

Refer

to

Figure

28

Exactly

455

kHz.

(400

Hz,

30%,

AM

modulated)

Exactly

510

kHz.

(400

Hz,

30%,

AM

modulated)

Coverage

Same

as

step

2.

L

Same

as

step

2.

Exactly

1650

kHz.

(400

Hz,

30%,

AM

modulated)

High

end

of

dial.

(minimum

capa-

city)

Low

end

of

dial.

(maximum

capa-

city).

High

end

of

dial.

(minimum

capa-

city).

Adjust

for

maximum

output.

Adjust

for

maximum

output.

Exactly

600

kHz.

(400

Hz,

30%,

AM

modulated)

600

kHz.

Same

as

step

2.

Adjust

the

AM

IF

transformers

(T101)

(T102)

Adjust

the

MW

oscillation

coil

(L9).

Adjust

the

MW

oscillation

trimmer

(TC107).

Same

as

step

2.

Adjust

the

MW

antenna

coil

(L7).

(See

Note

A)

Tracking

Same

as

step

2.

Exactly

1400

kHz.

(400

Hz,

30%,

AM

modulated)

1400

kHz.

Same

as

step

2.

Adjust

the

MW

antenna

trimmer

(TC104).

(See

Note

A)

Repeat

steps

2,

3,

4,

and

5

until

no

further

improvement

can

be

made.

Same

as

step

2.

Exactly

145

kHz.

(400

Hz,

30%,

AM

modulated)

Low

end

of

dial.

(maximum

capa-

city)

Same

as

step

2.

Adjust

the

LW

oscillation

coil

(L10).

Band

Coverage

Same

as

step

2.

Exactly

295

kHz.

(400

Hz,

30%,

AM

modulated)

High

end

of

dial.

(minimum

capa-

city)

Same

as

step

2.

Adjust

the

LW

oscillation

trimmer

(TC108).

Same

as

step

2.

Exactly

160

kHz.

(400

Hz,

30%,

AM

modulated)

160

kHz.

Same

as

step

2.

Adjust

the

LW

antenna

coil

(L7).

Tracking

Same

as

step

2.

Exactly

260

kHz.

(400

Hz,

30%,

AM

modulated)

260

kHz.

Same

as

step

2.

Adjust

the

LW

antenna

trimmer

(TC105).

Repeat

steps

7, 8,

9

and

10

until

no

further

improvement

can

be

made.

Band

Refer

to

Figure

29

Exactly

5.85

MHz

(400

Hz,

30%,

AM

modulated)

Low

end

of

dial.

(maximum

capa-

city)

Same

as

step

2.

Adjust

the

SW

oscillation

coil

(L8).

Coverage

Same

as

step

12.

Exactly

18.5

MHz.

(400

Hz,

30%,

AM

modulated)

14

High

end

of

dial.

(minimum

capa-

city)

Same

as

step

2.

Adjust

the

SW

oscillation

trimmer

(TC106).

Sharp GF-9090H User manual

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