Fisher Ph 70 User manual

SERVICE

MANUA

ee

Soe

BE

ast,

THE

FIRST

NAME

IN

HIGH

FIDELITY

SPECIFICATIONS

Power

Source

Frequency

Response

(Overall)

DCS

ccsaasees

Sawin

hie

hive

aacla

deta

uerteltt

6V

Fe203

(HP

7,

Mignonzelle,

R

6)

x

4

Headphone

..................ccceeeeeeee

40

~

10,000Hz

Output

Power

SPCak

er

shi.

occkecias

edie

Sevesctetieces

200

~

6,000Hz

Headphone

.............00

0.

0ccceeecee

eee

50mW

x

2

(Max.)

Metal

Speaker

..........cccccccesceeacaceeceeeees

700mW

(Max.)

Headphone

...............c.cccceeeseeee

40

~

12,000Hz

Current

Consumption

(at

Vol.

Min.)

SPCakel

cise

Svar

oes

Benes

cndaees

200

~

6,000Hz

Record

mode

.............00.ccceeeeeeaes

220mA

Erase

Ratio

(Overall,

with

Fe2O3)

.......

more

than

50dB

Playback

mode

...............ccceceeeeee

180mA

Signal

to

Noise

Ratio

(with

Fe2Os3)

......

more

than

40dB

Fast

Forward

mode

...................00.

230mA

Crosstalk

(with

Fe2O3)

Rewind

mode

..................0ceeceeees

260mA

Track

to

Track

......c..ccecceceeceeees

...

more

than

55dB

Recording

System

.........6.....ecceeeeees

AC

Bias

Channel

Separation

(with

Fe2Oa)

.......

more

than

23dB

Erasing

System

....0..........cccceeeeeeuee

Magnet

Erasing

Harmonic

Distortion

(K3,

with

Fe2O3)

..

less

than

6%

Tape

Speed

(Normal)

...............0.008.

1-7/8ips.

+3%

Hum

&

Noise

Fast

ss

.o/c

tlic

iavpntece

veces

eSne

oie

+20%

(at

Vol.

Min.

with

AC

Adaptor)

..........

—65dBs

SOW

soo

ce

Sade

denies

Oo

osnca

band

oezbdexeuves

—10%

Terminal

Impedance

Fast

Forward

Time

............0s.0eceecees

150sec.

(with

C-60)

MICs

cos

fidsdaiteaiad

oncernotdia

oteaieeds

3.9kO

Rewind

Time

............cccccececceceeesees

150sec.

(with

C-60)

Ext.

Speaker

20.0.0...

ccccccecceeecceees

470

Torque...

;

Dimensions

(WxHxD)

.........

93(W)

x

158(H)

x

42.5(D)

mm

Playback

.....0....cccccccceeeeseeeeeeeeess

35

~

55g-cm

Weight

.........0...c0ccceeeeee

er

eree

480g

Fast

Forward

..............ccccceeeceeeees

more

than

559-cm

Frequency

Range

Rewind.....

Radel

ceeds

aenie

vide

naam

usties

more

than

55g-cm

IM.

eos

oo

0

Seed

dss

eae

Maeding

bie

adedadecet

525

~

1,605kHz

‘Wow

&

Flutter

.........

ccc

cece

eee

eeees

0.5%,

RMS

BM

iccsescties

esas

Secktewtecefeveaecaaerex

Ss

88

~

108MHz

—Specifications

subject

to

change

without

notice.—

DISASSEMBLY

INSTRUCTIONS

GENERAL

REMARKS

®

Before

disassembling

the

unit,

spread

a

soft

rubber

mat

ora

cloth

on

the

work

bench

to

avoid

scratches

and

grease

stains.

e

Donotusea

material

which

is

likely

to

cause

static

electricity

because

transistors

and

ICs

may

be

easily

damaged

by

it.

e@

Reassemble

the

unit,

noting

the

kinds

of

screws,

the

solder-

ing

and

arrangement

of

the

leads.

Refer

to

“Circuit

Diagrams

and

Exploded

Views”

for

correct

assembly.

¢

Before

disassembling

the

unit,

take

out

the

cassette

tape

and

the

batteries.

CABINET

BOTTOM

REMOVAL

1.

Remove

the

five

screws

(1

~

5)

fastening

the

Cabinet

Bottom

Select

Panel

Bottom

and

detach

the

Cabinet

Bottom

by

lifting

it.

2.

The

Select

Panel

can

be

removed

from

the

unit

by

detaching

the

Cabinet

Bottom.

3.

Reassemble

in

reverse

order.

o

O

DISASSEMBLY

INSTRUCTIONS

(continued)

P.C.BOARD

ASSEMBLY

REMOVAL

4.

Remove

the

Cabinet

Bottom

and

Select

Panel

by

following

the

instructions

and

unsolder

the

speaker

leads

(blue

and

white),

the

leads

of

the

power

supply

(black

and

red)

and

the

motor

leads

(black

and

red)

from

the

P.C.Board.

Leads

of

Power

Supply

Amplifier/Radio

Tuner

P.C.Board

3.

Reassemble

in

reverse

order.

NOTE:

When

the

P.C.Board

is

mounted

on

the

Mechanism

Chassis,

set

the

Switches

on

the

P.C.Board

to

the

Mechanism

correctly.

Moter

Leads

Red

=

MECHANISM

CHASSIS

REMOVAL

ae

1.

Remove

the

P.C.Board

Assembly

«by

following

the

Black

F

:

instructions.

2.

Remove

the

two

posts

(9

and

10)

and

the

fastening

screw

*(11)

from

the

Chassis

and

then,

detach

the

Mechanism

Chassis

by

lifting

it

from

the

Cabinet

Top.

2.

Remove

the

three

screws

(6

~

8)

fastening

the

P.C.Board

_and

detach

the

P.C.Board

by

lifting

it

in

the

direction

of

the

arrow.

ADJUSTMENTS

GENERAL

REMARKS

e

Before

adjustment,

wipe

the

tape

contacting

surfaces

clean

as

well

as

the

contacting

surfaces

of

the

driving

parts

witha

soft

cloth

soaked

in

alcohol.

Trouble

may

occur

because

of

oil

and

grease

stains.

e

Carefully

handle

the

belt

because

grease

easily

attaches

to

it.

Then,

check

the

used

rubber

parts.

If

the

rubber

has

dete-

riorated

or

is

scratched,

replace

the

parts

with

new

ones.

EQUIPMENT

REQUIRED

Cassette-type

Torquemeter

VTVM

(2

sets)

Frequency

Counter

Dualirace

Synchroscope

DC

Constant-voltage

Regweee

Dummy

Load

(330

)

-

Test

Tapes

*

3kHz

Test

Tape

eeiible:

TEAC

MTT-111)

for

Tape

Speed

Adjustment

*

10kHz

Test

Tape

(Example:

TEAC

MTT-114)

for

Head

Azimuth

Adjustment

e

Alignment

Tool

Before

the

Electrical

Adjustments,

set

the

Switches

as

follows:

*

Tape

Select

Switch

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

cece

ee

eee

cence

eee

es

NORMAL

*

.

Function

Switch

.........0..00..000.

edison

Shoe

Sula

ee

TAPE

*

Pitch

Control

Switch

..............06+

sfedhanueicecandataconsas

“N”-

NOTE:

‘

, _

Supply

6.0V

DC

to

the

External

Powel

Jack

from

the

constant-voltage

regulator

at

the

adjustment.

4

NOTES

ON

HANDLING

THE

CHIP

ELEMENT

Pay

due

caution

to

the

following

items:

1.

Donot

use

the

removed

chip

element

again.

2.

ee

a

soldering

iron

of

less

than

30W.

The

soldering

iron

should

not

touch

the

body

of

the

chip

element.

Complete

soldering

in

a

short

time.

Apply

solder

to

the

chip

element

as

illustrated

below.

Solder

Chip

Element

Chip

Element

Solder

VY

P.C.Board

>

4

O

(Incorrect)

(Correct)

\

AUTO

SHUT-OFF

MECHANISM

ADJUSTMENT

1.

When

the

unit

is

set

in

the

playback

mode,

the

Shut-off

Lever

reciprocates

according

to

the

rotations

of

the

Take-up

Idler

and

Take-up

Reel.

2.

Set

the

unit

in

the

playback

mode

with

the

power

supply

off

and

slowly

turn

the

Flywheel

clockwise

until

the

Shut-off

Lever

comes

closest

to

the

Spring.

3.

Check

that

the

Spring

touches

the

Rewind

Arm,

and

that

the

clearance

of

0

~

0.5mm

remains

between

the

Shut-off

Lever

and

Spring

as

iflustrated.

Shut-off

Lever

Rewind

Arm

Spring

4.

If

the

specified

clearance

is

not

obtained,

adjust

the

clear-

ance

by

bending

the

Spring.

NOTE:

If

the

clearance

is

not

adjusted

correctly,

the

following

symp-

toms

can

occur:

A.

When

the

clearance

is

more

than

0.6mm;

When

the

Rewind

button

is

released

to

return

the

unit

from

the

review

mode

to

the

playback

mode,

the

unit

may

shut

off

automatically.

B.

When

the

Shut-off

Lever

pushes

the

Spring

while

reciprocating;

*

When

the

tape

has

reached

its

end

with

the

unit

in

the

playback

mode,

the

unit

may

not

shut

off

automatically.

9

“+

3.

While

playing

back

the

test

tape,

adjust

the

tape

speed

by

.

ADJUSTM

ENTS

(continued)

TAPE

SPEED

ADJUSTMENT

1.

Remove

the

Battery

Compartment

Lid

from

the

unit

and

insert

a

3kHz

test

tape

(Example:

TEAC

MTT-111)

into

the

unit.

2.

Connect

the

frequency

counter

to

the

headphone

jack

as

il-

lustrated

and

play

back

the

test

tape.

Frequency

Counter

3,000Hz

3%)

Wis

(je

exes

2G

a

Dummy

Load

330,

PHONES

turning

the

potentiometer.

(P301)"

‘on-the

Amplifier

P.C.

Board

until

the

frequency

cou

nter.

‘reads

3kHz

3%).

Potentiometer

(P301)

for

Tape

Speed

Adjustment

HEAD

AZIMUTH

ADJUSMENT

1.

Connect

two

VTVMs

and

a

synchroscope

to

the

headphone

jack

as

illustrated.

Set

the

synchroscope

as

follows:

*

MODE

*

SOURCE

*

SWEEP

MODE

...........2..:.:2

ee

eee

oe

cease

Boe

8

dca

ahtted

aie

nig

aE

ie

CHOP

(chopped)

INT

(internal),

CH1

or

CH2

AUTO

(automatic)

Synchroscope

VTVM

(Max.)

Dummy

Load

PHONES

insert

a

10kHz

test

tape

exeinple:

TEAC

MTT-114)

into

the

unit

and

play

it

back.

While

playing

back

the

test

tape,

slowly

turn

the

azimuth

ad-

justing

screw

until

the

amplitudes

of

both

channel

output

wave

forms

become

maximum

and

the

wave

forms

overlap

as

well

as

possible

in

me

maximum

condition

of

the

VTVM

as

illustrated.

“

Azimuth

Adjusting

Screw

4.

After

the

adjustment,

secure

the

adjusting

screw

with

paint

or

glue.

DIAL

CORD

STRINGING

5a

uy,

1.

Tie

the

dial

cord

of

length

700mm

and

diameter

$0.3

to

the

4.

Observing

the

Tuning

Knob

from

the

P.C.Board

side,

turn

it

spring

and

hook

the

spring

to

the

illustrated

position

of

the

clockwise

until

it

stops.

drum.

Then,

match

the

pointer

to

the

mark

on

the

Pointer

Guide

and

attach

it

to

the

dial

cord

as

illustrated.

2.

Engage

the

dial

cord

as

illustrated

in

the

following

order

Drum

—

Roller

A

—

Roller

B

—

Tuning

Shaft

(4

turns)

—

5.

Secure

the

dial

cord

knot

and

the

pointer

with

paint

or

glue

in

Roller

C—

Roller

D>

Drum-—

Spring

the

position.

3.

Hook

the

dial

cord

to

the

spring

and

tie

the

cord

where

the

end

of

the

spring

is

positioned

2

~

4mm

from

the

illustrated

position

of

the

drum.

Dial

Cord

Pointer

Guide

Roller

A

Start

Position

Tuning

Shaft

v4

4

Turns

Pointer

TUNER

ADJUSTMENT

Use

an

alignment

tool

with

plastic

grip

for

all

adjustments.

When

performing

the

FM

Alignment,

open

the

headphone

EQUIPMENT

REQUIRED

e

AMStandard

Signal

Generator

e

FM

Standard

Signal

Generator

e

Generator

Scope

@

Loop

Antenna

e

Dummy

Antenna

(750,

unbalanced

type)

for

FM

e

Ceramic

Capacitor

(1OpF)

for

FM

IF

Alignment

e

VIVM

e@

Frequency

Counter

NOTE:

antenna

circuit

as

illustrated.

re

a

AM

ALIGNMENT

Oscilloscope

Dummy

Load

(33)

Alignment

Tool

Before

performing

the

adjustment,

set

the

switches

as

follows:

*

RADIO/PLAY

AM

or

FM

*

Band

Select

Switch

\ieeahtEong

toncsonanentenrassantvancemasaamana

Na?

Standard

Test

Frequency

400Hz

and

Modulation

30%

at

AM

Connections

Alignment

Calibration

of

IF

for

AM

Connect

loop

antenna

to

output

terminal

of

gene-scope.

Place

loop

antenna

60cm

away

from

bar

antenna.

OUTPUT

Connect

input

terminal

of

gene-

scope

to

2

(TP4)

in

IC3.

Frequency

of

Signal

Generator

Tuning

Dial

Setting

Remarks

Adjustments

Obtain

symmetrical

curve

and

maximum

amplitude.

460kKHz

Low

End

Calibration

of

Tuning

Range

Adjustment

of

Tracking

Connect

loop

antenna

to

output

terminal

of

AM

signal

generator.

Place

loop

antenna

60cm

away

from

bar

antenna.

Connect

VTVM

with

330

dummy

toad

and

oscilloscope

to

Headphones

jack.

510kHz

T4

Obtain

sine-wave

of

400Hz

and

maximum

amplitude.

1,670kHz

|

HighEnd

TC4

(PVC)

600kHz

600KHz

LS

(bar

ant.

coil)

1,400kHz

|

1,400kHz

TC3

(PVC)

Repeat

the

above

adjustment.

TUNER

ADJUSTMENT

(continued)

FM

ALIGNMENT

Standard

test

frequency

400Hz

and

deviation

22.5kHz

of

Signal

Benin

za

Adjustments

Generator

etting

INPUT

OUTPUT

10.7MHz

Low

End

T1

and

T3

#

108.2MHz

High

End

TC2

(PVC)

Connect

output

Connect

input

Obtain

S

curve

and

terminal

of

gene-

terminal

of

gene-

maximum

amplitude.

Calibration

scope

to

4

scope

to

2

of

(TP3)

of

IC1

(TP4)

of

IC3.

through

ceramic

capacitor

(10pF).

Calibration

of

Tuning

Range

Connect

FM

signal

generator

to

antenna

terminal

Obtain

sine-curve

and

maximum

amplitude.

Connect

VTVM

with

330

dummy

load

(TP1)

through

and

oscilloscope

Adjustment

dummy

antenna

to

Headphones

90MHz

of

(750,

unbalanced

Tracking

type).

aoewrz|

seme

|

Tor

v0

Repeat

the

above

adjustment.

FM

MPX

(Multiplex)

ADJUSTMENT

49kHz

(V.C.O.)

ADJUSTMENT

Before

performing

the

adjustment,

set

the

unit

as

follows:

@

Function

Switch

................cceee

ene eee

ener

eeeee

RADIO/PLAY

®

Band

Select

Switch

.......0..

0.

ccc

eee

ener

eee

eens

FM

ST

1.

Connect

the

frequency

counter

to

the

12

(test

point

TP8)

inIC3

(LA3361).

2,

Adjust

the

potentiometer

(P1)

until

the

frequency

counter

reads

19kHz

(+20Hz).

ee

:

Ref.

No.

aA

WOON

ANA

WONM

—

o

CAI

CA2

CAS

CA4

CAS

CA6

CA7

CAB

CA8-1

CA9

CA10

CAI1

CAI2

CA13

CA14

CAIS

CAI6

CAi7

CA18

CA19

Cx

CX2

CX3

CX4

CXS

CX6

CX7

Cx8

Part

No.

PACKAGE

141

6

1419

67302

141

6

1449

85400

141

6

3919

43100

141

6

2519

12090

141

6

4559

03300

ACCESSORIES

4

1529

70262

4

2419

74052

6

4519

19400

2.1769

07300

141

2

1769

07401

141

2

1819

14002

142

6

4119

31664

141

HEADPHONES

4

1529

70262

4

2369

73560

2

3529

36700

2

4469

41100

4

1519

71230

2

1259

04500

2

1769

06304

2

1769

06305

2

8219

32400

2

3529

36800

2

1769

06400

141

144

141

CABINET

141

0

1249

22804

141

0

1119

87804

141

2

4469

36500

141

2

2149

17900

141

2

7539

23700

141

2

1149

28700

4

1519

71360

2

4419

17100

2

4419

17101

2

2149

18000

2

8519

64500

0

3829

08800

2

4219

09003

2

2419

27500

0

1119

87904

2

4359

21500

4

2449

70320

2

3829

34400

2

4219

03002

0

1339

11201

3

1302

00411

104

3

1302

00611

101

3

1302

01011

103

3

1302

00611

103

3

1302

01211

110

3

2102

00081

110

3

9500

80054

128

3

1320

05018

144

141

144

141

101

PARTS

LIST

Description

Individual

Carton

Case

Styrofoam

Pad

Poly

Cover

Serial

No.

Sheet

Headphones

Cassette

Warranty

Card

Shoulder

Strap

Hand

Strap

Carrying

Case

Instruction

Manual

Headphones

Plug

Cord

Tube

Ear

Pad

Ear

Speaker

Housing

Hanger,

Left

Hanger,

Right

Stopper

Slide

Adjustor

Slider

Cassette

Lid

Assy

Cabinet

Top

Assy

Cushion

Bracket

Spacer

Panel,

Select

Speaker

(8)

[SP1]

Cushion

Bracket,

Speaker

Spring,

Cassette

Lid

Terminal

Battery

Assy

Screw

+M2.0x2.0

Sheet,

Knob

Cabinet

Bottom

Assy

Insulator

Rod

Antenna

Terminal

Screw

+M2.0x3.0

Battery

Lid

Assy

Screw,

Pan

Hd.

+M2.0x4

Screw,

Pan

Hd.

+M2.0x6

Screw,

Pan

Hd.

+M2.0x10

Screw,

Pan

Hd.

Tapping-2

+M2.0x6

Screw,

Pan

Hd.

Tapping-2

+M2.0x12

Spring

Washer-2

M2.0

Nylon

Washer

M5.0x8.0x0.5

P|

Screw-3,

Pan

Hd.

+M2.0x5.0

Q’ty

wn

—

at

ww

a

eo

oe

ee

mA

MOND

AH

NYONMNNNM

wees

oer

oe

tee

errr

wm

ry

HH

BAYH

KH

Hw

HK

BA

Be

Ref.

No.

dCi

DC2

DC3

DC4

DC5

DC6

DC7

DC8

pcg

DC10

DC11

DC12

DC13

DC14

DCi5S

DC16

DC17

DC18

DC19

.

DC20:

0021

DC22

DC23

DC24

0C25

DC26

DC27

DC27-1

444

DC28

DC29

DC30

0C31

DC32

DC33

DY1

DY2

DY3

DY4

DY

DY6

Part

No.

Description

RADIO

CHASSIS

141

2

1149

28801

2

4469

42600

4

1539

70780

2

2449

44400

2

1559

07200

2

1649

17602

2

8259

10600

2

7519

60100

2

4219

26800

2

1639

50801

2

1639

50701

4

2229

73404

2

1649

19701

2

8219

32700

2

5119

06500

4

2029

70533

4

2439

71760

2.

1639

50601:

2

2719

18400

2

7519

60900

2

7519

60200

2

1639

50901

4

2579

71052

2

4469

40100

4

1329

78219

2

3769

13900

2

1539

14600

2

1539

14601

2

8429

06400

2

4419

14901

4

2319

75651

2

7539

23800

2

5389

03600

141

2

8549

14200

101

3

1302

00811

103

3

1302

00611

106

3

1302

00123

127

3

1317

02514

128

3

1317

03018

629

3

0907

00000

144

141

1441

141

1441

141

144

141

144

141

144

141

144

NOTES:

1.

Parts

order

must

contain

Model

Number,

Part

Number

and

Description.

2.

Ordering

quantity

of

screws

and

resistors

must

be

multiple

of

10pces.

Control

Panel

Cushion

Microphone

Assy

[BM1]

Net,

Mike

Grill,

Mike

Switch

Button

Roller

Shaft

Screw

Knob,

Volume

Knob,

Volume

Control

P.C.B.

Assy

[See

PCB2]

Knob,

Switch

Pointer

Guide

Pointer

LED

Indicator

P.C.B.

Assy

[See

Flexible

Printed

Circuit

Knob,

Tone

Pin,

Strap

Rolier

Shaft

Dial

Shaft

Knob,

Tuning

Bar

Antenna

[L5]

Cushion

PCB3]

AMP/Tuner

P.C.B.

Assy

[See

PCB1]

Sheet,

Switch

Spacer,

Jack

Spacer,

Jack

R/P

Switch

Lever

Sheet

Switch

P.C.B.

Assy

[See

PCB4]

Spacer

Drum

Spring

Screw,

Pan

Hd.

Screw,

Pan

Hd.

Tapping-2

Hex.

Nut-3

PI

Screw-1,

Pan

Hd.

Pl

Screw-3,

Pan

Hd.

String,

60.3

+M2.0x8

+M2.0x6

M2.0

+M1,7x2.5

+M1.7x3.0

Q’ty

|aeo32po

pnmeanawew

eee

wm

aee

eee

worsen

see

seen

ne

BPH

Hoa

SK

CABINET

EXPLODED

VIEW

€>

CAII

Fisher PH 70 User manual

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