Akai 1700 User manual

SERVI

AKATI

TAPE

RECORDER

TABLE

OF

CONTENTS

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SPECIFICATIONS

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1

HOW

TO

MEASURE

DESIGNATED

VALUES

OF

SPECIFICATIONS

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2

LOCATION

OF

CONTROLS

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3

DISASSEMBLY

OF

TAPE

TRANSPORT

UNITS

AND!

AMPLIFIERS

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4

TRANSPORT

MECHANISM

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6

ADJUSTMENT

OF

TAPE

TRANSPORT

UNIT

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9

ADJUSTMENT

OF

AMPLIFIER

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10

MAINTENANCE

PROCEDURES

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W

LIST

OF

REPLACEMENT

PARTS

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12

EXPLODED

VIEW

OF

COMPONENT

PARTS

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14

TROUBLE

SHOOTING

CHART

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21

SCHEMATIC

DIAGRAM

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CONNECTING

DIAGRAM

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UIEEnEENnSnEDnSNnn

EE

nn

eS

MODEL

NUMBER:

WEIGHT

(NET

IN

CARTON):

DIMENSIONS

POWER

RE-

QUIREMENTS:

POWER

CON-

SUMPTION:

RECORDING

SYSTEM:

PLAYBACK

SYSTEM:

TAPE

SPEED

TAPE

SPEED

DEVIATION

:

WOW

AND

FLUTTER:

FAST

FORWARD

AND

REWIND

TIME:

FREQUENCY

RESPONSE:

DISTORTION

:

SIGNAL-TO-

NOISE

RATIO:

CROSS

TALK

CHANNEL

SEPARATION

:

I

SPECIFICATIONS

Akai

Model

1700,

portable

4-track

stereo

tape

recorder.

33

Ibs

(15

kg)

without

accessories.

13-14”

(H)

x

13-44”

(W)

x

9”

(D)

case

closed.

A.C.

100, 110,

120,

200,

220

or

240

volts

interchangeable.

50-60

cycles.

80

VA.

Inline

4

track

stereo

and

4-track

mon-

aural

recording.

Inline

4-track

stereo,

monaural

play-

back.

Three

speeds;

7-44”

(19cm),

3-34”

(9.5

cm)

and

1-7”

(4.75

cm)

per

second.

(15”

per

second

with

an

optional

accessory

capstan

and

pinch

wheel.)

Less

than

+3

per

cent

at

all

tape

speeds.

Less

than

0.2

%

at

7-14

ips.

R.M.S.

Less

than

0.3

%

at

3-%

ips.

R.M.S.

Less

than

0.45

%

at

1-%

ips.

R.M.S.

150

seconds

for

1,200

ft.

tape

at

50

cy-

cles

and

120

seconds

at

60

cycles.

40

to

18,000

cps.

at

7-44

ips:

3db.

80

to

12,000

cps.

at

7-44

ips;

&

3db.

80

to

10,000

cps.

at

3-34

ips;

£4db.

80

at

4,000

cps,

at

1-7

ips.

Within

4%

at

1,000cps,

0

VU

(total

harmonic)

40

db

below

recorded

level

signal

at

all

speeds.

Within

55

db

between

each

track.

Better

than

80

db

at

1,000

cps

+3

VU.

POWER

INPUT

LEVELS:

POWER

OUTPUT:

INSULATION

RESISTANCE;

INSULATION

YIELD

STRENGTH:

MONITORING

SYSTEM

:

MOTOR

HEADS

MICROPHONE

USED:

SPEAKER

INCLUDED:

TUBES

USED

SILICON

DIODE

USED:

REELS

USED

RECORDING

LEVEL

INDICATOR:

Microphone

input

level

—55

db

(VR.

max.)

at

1,000

cps.

Phono

and

radio

input

level

—40

db

(VR.

max.)

at

1,000

cps.

Pre-Amplifier

output,

0.7V

at

1,000

cps,

impedance

more

than

100K

ohms.

Main

output,

34

dbm.

up

(in

600

ohms).

More

than

50

MEG

ohms.

More

than

one

minute

at

A.C.

1,000

V.

With

headphone

during

recording.

Condenser

starting

induction

two-

speed

motor.

1/100

HP.

Power

factor,

70

per

cent.

2,900

to

1,450

r.p.m.

at

50

cps,

3,480

to

1,740

r-p.m.

at

60

cps.

Inline

4-track

stereo/monaural

record-

play

head;

Impedance...3,500

ohms

+

10%

at

1,000

cps.

4-track

erase

head

;

000

ohms

415%

at

90

Impedance...

ke.

Round

dynamic

microphone

Impedance...50,000

ohms

Sensitivity...

—55

db.

Frequency

Response...70

to

15,000

cps

+10db.

Two

5’

x7”

dynamic

speakers,

Impedance...8

ohms

Allowable

Input...6

watts

Frequency

Response...80

to

12,000

cps,

£10

db.

12AT7

x2,

6BM8

x2.

150D

x2

Up

to

7”

reel

Horizontal,

A-model

VU

meter.

I

HOW

TO

MEASURE

DESIGNATED

VALUES

OF

SPECIFICATIONS

TAPE

SPEED

DEVIATION:

WOW

AND

FLUTTER:

FREQUENCY

RESPONSE:

(OVERALL

FREQUENCY

RESPONSE)

Record

the

1,000cps.

sine

curve

of

the

tape

speed

at

rating

speeds

with

a

standard

sound

recorder

(AMPEX

351A,

for

instance)

which

is

little

af-

fected

by

the

tape

speed

deviation

throughout

the

whole

length

of

the

tape.

Put

this

standard

tape

on

the

tape

recorder

under

test

for

playing

back,

and

measure

its

output

by

a

counter,

then

convert

the

value

into

rating

power

frequency

to

evaluate

the

tape

speed

deviation.

For

a

rough

measurement,

the

tape

speed

deviation

can

also

be

measured

with

a

testing

tape

for

speed

by

a

stop

watch,

Playback

the

3,000

cps.

standard

tape

that

guarantees

wow

and

flutter

with-

in

0.07

per

cent,

and

read

the

effective

value

on

wow

meter.

Since

the

sensibility

of

wow

and

flut-

ter

frequency

below

2cps.

and

above

5

cps.

drops,

the

frequency

over

5

cps.

is

put

to

3db/OCT

circuit,

and

the

frequency

below

2

cps.

is

put

to

6

db/

OCT

circuit

for

adjustment.

This

ad-

justed

value

is

called

auditory

com-

pensated

value.

Connect

to

the

input

terminal

of

the

recorder,

record

a

sine

curve

sweep

frequency

at

100

cps

—10

db,

from

Audio

Frequency

Oscillator.

Adjust

tone

vulume

to

flat,

playback

the

tape

by

connecting

VTVM

to

spe-

aker

out

put

then

read

the

frequency

response

to

adjust

a

maximum

devia-

tion

of

6

db.

TOTAL

HARMONIC

DISTORTION

FACTOR:

SIGNAL

TO

NOISE:

OUTPUT:

CROSS

TALK:

Provide

the

input

terminal

of

th

recorder

with

1,000cps.

sine

curv

signals

and

record

these

signals

on

|

recording

tape

at

the

zero

level

on

th

recorder’s

VU

meter.

Then

playback

the

signals

under

th

normal

recording

condition

to

meas

ure

the

distortion

factor

by

an

oscil

lator.

Remove

the

recording

tap:

from

the

recorder,

then

read

the

nois

level

on

the

oscillator

to

get

the

requir

ed

distortion

factor

by

the

followin

formula:

d0=d—dl—d2

di

equired

d...overall

distortion

factor

dl...noise

level

d2...distortion

factor

of

the

oscilla

tor

used

Playback

the

sine

curve,

250

cps.

tape

recorded

on

a

standard

recorder

or

the

recorder

to

measure

the

voltage.

Remove

the

tape,

then

measure

the

noise

level

under

the

same

condition

Calculate

the

ratio

between

the

twc

in

decibel.

Playback

on

the

recorder

the

1,000

cps.

sine

curve

tape

which

was

recorded

at

the

zero

VU

level

on

a

standard

recorder.

Terminate

the

test

recorder

with

eight

ohms.

Square

the

voltage

reading,

then

di-

vide

the

figure

by

eight

ohms

to

get

the

r.m.s.

power

output.

:

Record

1,000

cps.

signal

at

+3

VU

on

the

third

track,

then

playback

this

signal

through

a

1,000

cps.

Band

Pass

Filter.

Compare

the

output

of

tracks

1

and

3

in

decibels.

Il

LOCATION

OF

CONTROLS

SBSGSBHG8SOGHOHGBHSSGOORODDOOOS

Supply

reel

shaft

Cycle

conversion

switch

Capstan

storage

post

Head

cover

Record/Play

head

Tape

guide

Erase

head

Index

counter

Right

channel

volume

control

Right

channel

tone

control

Left

channel

microphone

input

jack

Right

channel

microphone

input

jack

Left

channel

volume

control

Left

channel

tone

control

Speed

change

switch

Take-up

reel

shaft

Capstan

shaft

Pinch

wheel

Automatic

stop

lever

Record/Play

switch

Instant

stop

lever

SGE6GGOSHOSSBBSHBHOHHHBHS

Rewind/Fast-forward

switch

Record

safety

button

Automatic

stop

switch

Stereo

headphone

jack

VU

meter

conversion

switch

Power

switch

VU

meter

Track

selector

switch

Fuse

post

Cycle

conversion

switch

Speaker

switch

Hum

adjust

(right)

Speaker

output

jack

(right)

Speaker

output

jack

(left)

Voltage

selector

switch

Preamp

output

jack

(right)

Preamp

output

jack

(left)

Phono/Radio

input jack

(left)

Hum

adjust

(left)

Phono/Radio

input

jack

(right!

VV

DISASSEMBLY

OF

TAPE

TRANSPORT

UNITS

&

AMPLIFIERS

(1)

Loosen

the

RETAINING

SCREW

{a}

of

PINCH

ROL-

(3)

Loosen

the

SCREWS

marked

from

(a)

to

(d)

in

order

to

LOR

(b}

using

a

phillips-headed

screw

driver

to

remove

DECK

PANEL

(P).

the

PINCH

ROLLER

(b).

(2)

Remove

the

DECK

CONTROL

KNOBS

(a)

and

(b)

by

(4)

Loosen

the

SCREWS

marked

from

(a)

to

(d).

loosening

their

retaining

screws

using

a

phillips-headed

screw

driver.

(5)

Loosen

the

SCREWS

marked

from

(a)

to

(d).

(6)

Lift

TAPE

DECK

and

AMPLIFIER

(D)

from

the

cabinet

(B).

(7)

Disconnect

the

PINS

of

speaker

marked

{a)

and

(d},

the

PLUGS

of

motor

marked

(e}

and

(f)

and

the

PINS

of

head

marked

(g)

and

(j).

(8)

Loosen

the

RETAINING

SCREWS

of

deck

frame

marked

from

{a}

to

(d)

(9}

Separate

TAPE

DECK

(M)

from

AMPLIFIER

(A)

Fig.

1

VY

TRANSPORT

MECHANISM

Driving

of

Capstan

Figure

1.

{A)

Motor

(B)

Driving

Belt

(flat

belt)

(C)

Capstan

(D)

Flywheel

High-speed

rotation

of

Motor

(A)

is

reduced

by

Driving

Belt

(B)

and

transmitted

to

Capstan

(C),

which

is

connected

to

Flywheel

with

ample

inertia

and

enables

rated

rotation

by

absorbing

minor

rotation

distortion

of

motor

itself.

Capstan

Rotation

606

r.p.m.

at

7-14”

(19

cm)

per

sec.

303

r.p.m.

at

3-34”

(9.5

cm)

per

sec.*

151.5r.p.m.

at

1-1"

(4.75m)

per

sec.

Motor

Rotation

—_

2,900

to

1,450

r.p.m.

at

50

cps.

3,480

to

1,740

r.p.m.

at

60

cps.

Driving

of

Pinch

Roller

Put

tape

between

rotating

capstan

and

pinch

roller

and

push

pinch

roller

against

capstan,

this

will

transport

the

tape

at

rated

speed.

The

appropriate

pressure

of

pinch

roller

is

between

1,000

to

1,150

grams

at

the

tape

speed

of

7-14

(19

cm)

per

second.

Recording

and

Play

Back

Turn

the

RECORD,

PLAYBACK

knob

(A)

to

“PLAY”

position,

and

pinch

roller

presses

against

capstan

to

move

tape

at

the

rated

speed.

At

the

same

time,

/dler

(B)

moves

between

Motor

Bushing

(C)

and

the

Take-Up

Reel

Spindle

(D)

to

transmit

the

motor

rotation

to

(D)

so

that

the

tape

is

moved

and

wound

on

the

take-up

reel.

The

Take-Up

Reel

Spindle

Base

is

made

up

of

two

plas-

tic

rollers

(1

and

2)

with

a

clutch

felt

in

between.

The

Idler

is

rotating

the

plastic

roller

(2)

under.

Therefore,

the

tape-

winding

friction

is

adjusted

by

the

slipping

of

the

felt

to

enable

rated

winding

of

the

tape.

On

the

other

hand,

the

Supply

Reel

Spindle

(H)

has

a

Brake

roller

(E)

hung

on

the

Plastic

Roller

(4)

under

which

provides

appropriate

back

tension

by

the

clutch

felt

slipp-

ing

to

the

rotation

of

the

Pulley

(3)

above.

To

prevent

accidental

erasure,

the

Record

Interlock

But.

ton

(F)

must

be

depressed

before

the

RECORD,

PLAY-

BACK

knob

can

be

moved

to

the

“REC”

position.

The

Safety

device

(G)

is

depressed

to

enter

the

record

mode.

(See

Figures

2

and

3)

Braked

Rotation

Slipping

Rotation

io

Fig.

3

FAST-FORWARD

MECHANISM

Turn

the

FAST

FWD-REWIND

knob

(A)

to

“FAST

FWD”

position,

and

he

cam

(B)

under

the

knob

pushes

up

the

Lever

(C).

The

Idler

(D)

moves

into

the

space

between

the

Plastic

Roller

(F)

above

the

Take-Up

Reel

Spindle

and

the

upper

part

of

the

rotating

motor

drive

bushing

to

transmit

the

motor

rotation

to

the

take-up

reel

spindle.

At

the

same

time,

Brake

Rollers

(H)

and

(I)

come

off

the

reel

spindle

to

free

the

Supply

Reel

Spindle

(G),

thereby

allowing

fast

winding

of

the

tape

onto

the

take-up

reel.

(See

Figures

4

and

5)

Free

Rotation

High-Speed

Rotation

NF

=

o

}

f

°

Wwe

Wye

2

E

Fig.

5

oO

T

REWIND

MECHANISM

Turn

the

FAST

FWD-REWIND

knob

(A)

to

“REWIND”

position,

and

the

cam

(B)

under

the

knob

pushes

the

Levey

(C)

up.

The

Idler

(D)

moves

into

the

space

between

the

up-

per

part

of

the

rotating

Motor

drive

bushing

(E)

and

the

Intermediate

Pulley

(F}

to

transmit

the

high-speed

rotation

of

the

motor

through

the

intermediate

pulley

to

the

Supply

Reel

Spindle

(G).

At

the

same

time,

Brake

Rollers

(H)

and

(I)

come

off

the

reel

spindle

to

free

the

take-up

reel

spindle

(J),

thereby

rewinding

the

tape

into

the

supply

reel

at

a

fast

speed,

(See

Figures

6

and

7}

High-Speed

Rotation

Free

Rotation

Cro

Op

Fig.

7

STOP

CONTROL

Pinch

|fake-up

Rewin

Meee

Supply

Push

the

stop

lever

to

“STOP”

position,

Brake

Rollers

Roller

jWitcet

Wheel

[Brake

|

‘Brake

(A)

and

(B}

depress

reel

spindles

to

stop

rotation

of

the

reel

|

spindles.

As

the

brake

rubber

depresses

the

plastic

rollers

under

the

reel

spindles,

no

friction

works

on

the

tape

itself.

Modes

of

Operation

(a)

STOP

4

(b)

FAST-FORWARD

(c)

REWIND

Supply

Reel

Spindle

Rewind

Idlerwhecl

Take-up

Reel

Spindle

Motor

Take-up

Side

(a)

RECORDING

_Brake

PLAYBACK

Supply

Side

Resid

NOTES:

x-marks

indicates

“open”

and

Brake

Idlerwheel

:

i

ra

f

O-marks

“engaged

Guide

Roller

Fizad

O

Pinch

Wheel

H

Fig.

8

RECORD/PLAYBACK

CHANGING

MECHANISM

By

turning

the

RECORD/PLAYBACK

KNOB

(N)

to

the

recording

position,

the

LEVER

{a}

pulls

the

RECORDING

LEVER

(b)

and

(c),

as

illustrated

in

dotted

line,

then

the

RECORD/PLAYBACK

CHANGE

SWITCH

(SWI)

turns

to

recording

position.

If

the

LEVER

(c)

does

not

turn

properly,

SW!

does

not

operate

properly

so

may

occur

the

abnormal

oscillation

and

also

can’t

record.

Then

must

adjust

the

LEVER

(c)

to

proper

position

by

loosing

the

SCREW

(d).

YW

ADJUSTMENT

OF

TAPE

TRANSPORT

UNIT

1.

ADJUSTMENT

OF

PINCH

WHEEL

It

is

important

that

the

pinch

wheel

shaft

is

kept

in

complete

alignment

with

the

capstan

shaft.

A

proper

pinch

wheel

pressure

is

between

1,000

and

1,150

grams

when.

the

unit

is

operated

at

the

tape

speed

of

7-4

ips.

Any

devia-

tion

from

this

specification

will

result

in

wow

and

flutter.

Check

pinch

wheel

pressure

by

a

spring

scale

and,

if

necessary,

adjust

the

pinch

wheel

load

spring.

2.

ADJUSTMENT

OF

TAKE-UP

IDLER

WHEEL

The

take-up

idler

wheel

must

be

kept

in

complete

align-

ment

with

the

take-up

reel

shaft.

When

the

unit

is

set

in

fast

forward

condition,

the

idler

wheel

will

contact

to

the

upper

knurled

wheel

of

the

take-up

reel

shaft

assembly,

and

it

will

contact

to

the

lower

knurled

wheel

during

record

or

play

mode.

Adjust

idler

wheel

load

spring

so

that

the

idler

wheel

pressure

is

kept

between

50

and

80

grams.

The

idler

wheel

rapidly

wears

if

the

pressure

is

excessive.

The

slippage

occurs

if

the

pressure

is

smaller

than

the

specification.

Fig.

1

Recording

Tape

25mm

y

0.125

0.025mm

ro

“

Erase

Head

Fig.

12

Rec

/

Play

Head

3.

ADJUSTMENT

OF

REWIND

IDLER

WHEEL

The

rewind

idler

wheel

must

be

kept

in

complete

align-

ment

with

the

rewind

reel

shaft.

The

amount

of

pressure

to

the

knurled

motor

bushing

should

be

maintained

about

50

grams

during

rewind

operation.

Adjust

both

the

idler

load

spring

and

rewind

roller.

4,

ADJUSTMENT

OF

INTERMEDIATE

WHEEL

The

intermediate

wheel

is

located

between

the

rewind

idler

wheel

and

the

rubber

ring

which

is

used

on

the

upper

part

of

the

supply

reel

shaft

assembly.

When

the

unit

is

set

in

rewind

mode,

it

will

contact

to

these

parts

simul-

taneously

delivering

torque

of

motor.

An

adequate

pres-

sure

is

50

grams.

Adjust

the

load

spring

of

the

intermediate

wheel

if

the

pressure

is

not

sufficient.

5.

ADJUSTMENT

OF

TAKE-UP

REEL

SHAFT

ASSEMBLY

A

felt

clutch

material

is

attached

to

the

bottom

side

of

the

reel

table

base

plate

so

that

recording

tape

will

not

be

stretched

during

fast

forwarding

operation

due

to

excessive

tension.

To

check

the

amount

of

friction

of

this

part,

place

a

5-inch

reel

with

recording

tape

wound

by

60m/m

in

diameter,

and

gently

pull

the

end

of

tape

upward

using

a

spring

scale.

Adjust

the

conical

spring

so

that

the

amount

of

tension

at

this

part

will

be

kept

between

400

to

500

grams.

Another

felt

clutch

material

is

attached

to

the

take-up

drive

wheel.

It

is

to

provide

proper

slipping

ope-

ration

during

record

or

play

mode.

The

procedure

for

checking

friction

of

this

part

is

same

as

the

foregoing,

and

between

120

and

200

grams

of

friction

will

provide

the

best

result.

Adjust

the

star-shaped

spring

jnst

under

the

take-up

drive

wheel.

When

the

unit

is

set

in

rewind

mode,

the

amount

of

friction

of

this

part

will

greatly

be

reduced

and

will

become

10

to

20

grams.

Check

to

see

whether

this

is

satisfactory

if

not,

readjust

the

star-shaped

spring

for

Brake,

and

spring

retainer

washed

accordingly.

(See

figure

11

(a)

at

left)

6.

ADJUSTMENT

OF

SUPPLY

REEL

SHAFT

ASSEMBLY

A

felt

clutch

material

is

used

between

the

lower

side

of

the

reel

table

base

plate

and

the

rewind

rubber

ring

to

protect

recording

tape

from

an

excessive

tension

while

re-

winding

operation.

To

check

the

amount

of

friction

of

this

part,

place

onto

the

supply

reel

table

a

5-inch

reel

with

recording

tape

wound

by

60m/m

in

diameter

and

gently

pull

the

end

of

tape

upward

by

a

spring

scale.

Adjust

the

conical

spring

so

that

the

amount

of

tension

is

kept

between

400

and

500grams.

Another

felt

clutch

is

attached

to

the

rewind

drive

wheel

to

provide

proper

slipping

operation

during

record

or

play

mode.

The

procedure

for

checking

friction

of

this

part

is

same

as

the

foregoing,

and

between

80

and

120

grams

of

friction

will

give

the

best

result.

When

the

unit

is

set

in

fast

forward

mode,

the

amount

of

friction

will

greatly

be

reduced

and

will

become

10

to

20

grams.

Check

to

see

whether

this

is

proper,

if

not,

readjust

coil

spring

and

spring

retainer

washer.

(See

figure

1]

(b)

at

left)

7.

ADJUSTMENT

OF

TAPE

HEAD

A

vertical

azimuth

alignment

of

tape

head

is

the

only

adjustment

that

can

be

made

at

the

field

of

service.

To

align

tape

head,

play

8,000

cycles

recorded

on

an

Ampex

standard

alignment

tape.

Rotate

the

azimuth

alignment

screw

until

a

maximum

playback

level

through

the

small

hole

which

is

positioned

on

the

shield

cover

of

the

tape

head

assembly.

W

ADJUSTMENT

OF

AMPLIFIER

1.

ADJUSTMENT

OF

RECORDING

BIAS

FREQUENCY

Recording/erasing

bias

frequency

was

sct

at

90

KG

plus

or

minus

5KC

before

shipment.

It

is

decided

by

inductance

of

the

oscillator

coil

(part

#17-L:)

and

its

resonant

capacitor

{part

C-17),

To

measure

recording

bias

frequency,

insert

a

10

or

100

ohm

resistor

in

series

to

the

record/play

head

and

connect

vertical

input

terminals

of

an

oscilloscope

as

shown

in

the

Fig.

13.

Another

testing

instrument

to

be

prepared

is

an

audio

frequency

oscillator

and

its

output

should

be

conne-

cted

to

horizontal

input

terminals

of

the

oscilloscope.

Vary

frequency

generated

by

the

audio

frequency

oscillator

around

90

KC,

and

set

the

oscillator

at

the

point

where

a

desirous

figure

appears

on

the

oscilloscope.

The

recording

bias

frequency

now

corresponds

to

the

reading

of

the

oscillator.

Check

oscillator

coil,

C-17

and

bias

head

if

the

recording

bias

frequency

measured

is

not

within

90KG

+

5KG,

2.

ADJUSTMENT

OF

RECORDING

BIAS

VOLTAGE

A

proper

recording

bias

voltage

is

45

volts

+

3

volts

A.C.

and

is

adjusted

by

Cl6,

To

measure

recording

bias

voltage,

connect

a

V.T.V.M.

(Vacuum

Tube

Volt

Meter)

to

the

record

[play

head

as

shown

in

the

Fig.

14.

Check

C16

{included

AK

13)

and

record/play

head

if

the

recording

bias

voltage

measured

does

not

meet

to

the

above-

mentioned

specification.

PAL)

JL)

FC,

100P:

V.T.VM.

{

ais

[tos

PAIR)

a

C,

,100P

FY

wean

elo

P,{L)

K+

oscittaton

©.

1OORF

Wt

OSCILLOSCOPE

AUDIO

FREQUENCY

‘OSCLOATOR

Fig.

13

L,(0.8.C)

tc

V,(P)(LEFT)

=

V,(G,)

RIGHT)

B+

EC,

100PF~

EE

VAG,

)LEFT)

sa

V,(P)RIGHT)

3.

ADJUSTMENT

OF

ERASING

BIAS

VOLTAGE

A

proper

erasing

bias

voltage

is

65

volts

+

5

volts

A.C.

and

is

adjusted

by

C14.

To

measure

erasing

bias

voltage,

connect

a

V.T.V.M.

to

the

erase

head

as

shown

in

the

Fig.

15.

Check

C4

and

erase

head

if

the

erasing

bias

voltage

measured

does

not

meet

to

the

above-mentioned

specification.

J,{L)

C,,150PF}

4

E.

HEAD,

P{R)

J,(R}

C.A50PF)

Fig,

14

P,(L)

J,(L)

C,.

100PF

pai

PAR)

J,(R}

C..100PF

L,(0.8.C)

at

V,(P)(LEFT)

P,

HEAD

a

me

B+

Ee

tigger

VG:

(RIGHT)

PL)

J,(L)

C,,150PF]

=

V(G,)

(LEFT)

Cis

V,(P)(RIGHT)

E

wea

Ee?

IF

P,(R)

J,(R)

C,,150PF]

ee

————%

+

V.T.V.M

Fig.

15

4,

ADJUSTMENT

OF

RECORDING

LEVEL

A

basic

recording

level,

referred

to

as

“0

VU”,

set

at

the

point

where

current

of

30zA

4

10%

flows

to

the

recording

head

at

1,000

cycles.

The

VU

meter

indicates

0VU

+

2VU

when

a

signal

of

—55db

+

5db

eets

at

the

microphone

jack

or

—40

db

+

5db

at

the

line

input

jack

when

a

the

volume

control

set

at

its

maximum.

®@

Adjustment

of

recording

level

can

be

accomplished

by

varying

sensi-

tear

art

|

town

Reon

|

ea

I

tivity

of

VU

meter,

however,

it is

not

necessary

to

make

in

a

field

of

oo

ashi)

service

as

all

VU

meters

have

correctly

been

calibrated

at

factory

before

?

shipment.

(See

Fig.

16

for

details.)

arent)

=

OMELET

LA?

NOTE:

Make

sure

to

stop

oscillation

by

disconnecting

the

oscillator

coil

#

17-L;

at

the

points

marked

“P”

and

“G”

prior

to

measure-

ment

of

recording

level.

—w-—

Fig.

16

VI

MAINTENANCE

PROCEDURES

1.

LUBRICATION

INSTRUCTION

For

maximum

service

life

and

optimum

performance,

lubricate

the

parts

identified

below

after

each

500

hours

of

operation.

Use

only

light

machine

oil

of

good

quality

Motor

3

drops

Drive

Capstan

Shaft

2

drops

Rewind

Idler

Wheel

Bearing

and

Wind

take-up

Idler

Bearing.

1

drop

Intermediate

Idler

Bearing

1

drop

Pinch

Wheel

Bearing

2

drops

Take-up

and

Supply

Reel

Shaft

Bearing

&

2

drops

Also

apply

a

liberal

film

of

light

machine

grease

to

each

roller

surface

of

all

levers

and

cams.

CAUTION:

DO

NOT

OVER-LUBRICATE.

WIPE

OFF

EXCESS

OIL

BY

A

COTTON

SWAB

SOAKED

IN

ALCOHOL.

OTHERWISE,

THE

OVER-FLOWED

LUBRICANT

MAY

BE

SCATTERED

DURING

OPERATION.

THE

RUBBER

COMPONENT

PARTS

WILL

BE

DETERIORATED.

FLYWHEEL

Fig.

17

2.

CLEANING

TAPE

HEADS

AND

OTHER

PARTS

Wipe

surface

of

tape

heads,

guide

roller

bearing,

capstan

bushing

and

pinch

wheel

periodically

with

a

soft

cloth

soaked

in

alcohol

or

carbon-tet.

eh

oe

Parts

No.

KX

LIST

OF

REPLACEMENT

PARTS

Nomenclature

TOP

PANEL

Deck

Panel

Head

Cover

Frame,

Head

Cover

Capstan

Rest

Capstan

Holder

Table

A,

Tape

Guide

Washer

Table,

Washer

Bearing

(635JZZ)

Washer

Table,

Washer

Table

B,

Tape

Guide

Prop,

Tape

Guide

Plate

DECK

FRAME

Deck

Frame

Head

Assembly,

Complete

Erase

Head

Record/Playback

Head

Screw

Flat

Mould

4x8

Prop

A,

Head

Prop

C,

Head

Screw

Flat

Mould

4x8

Screw

Flat

4x8

Index

Counter,

Complete

Pulley,

Counter

Belt,

Counter

Screw,

Without

Head

4x

7.5

Supply

Reel

Assembly

Screw

Flat

3x6

Plate,

Reel

Table

Reel

Shaft

A,

Supply

Reel

Rubber

Ring

Rewind

Pulley

Spring

G,

Left

Washer

Pin,

Large

Felt

Washer

Take-up

Roller,

C

Holder,

Reel

Shaft

(Star

Type

Spring

Washer

Pin,

large

Washer

Metal

Fitting

A,

Reel

Table

Holder,

Reel

Shaft

(Star

Type

Spring)

Washer

Nomenclature

Washer

Pulley,

Reel

Shaft

Screw,

without

Head

Take-up

Reel

Assembly

Reel

Shaft

A,

Take-up

Reel

Felt

Washer

Take-up

Roller,

A

Spring

G,

Right

Deer

Skin

Take-up

Roller,

B

Holder,

Reel

Sha‘t

(Star

Type

Spring)

Metal

Fitting

B,

Reel

Table

Spring,

F3

Washer

Nylon

Spring

AS

Lever,

Complete

Plate,

AS

Lever,

with

AS

Lever

Prop

Screw

Bind

3x5

Washer

3mm

Ground

Lug

Instant

Stop

Lever,

A

Spring,

Instant

Stop

Lever

Stopper,

Instant

Stop

Lever

Screw

Bind

3x5

Holder

B,

Instant

Stop

Lever

Screw

Flat

Mould

4x8

Recording

Safety

Button

Cam

Stopper

Fiber,

Cam

Stopper

Insulator

Plate,

Cam

Stopper

Screw

Flat

Mould

4x8

Pinch

Wheel

Metal

Cap,

Pinch

Wheel

Screw

Lever,

Pinch

Wheel

Shaft

C,

Pinch

Wheel

4mm

Nut

Shaft

A,

Cam

Roller

Cam

Roller

B

Shaft,

Pinch

Wheel

Lever

Lever,

Take-up

Brake

Take-up

Brake

Roller

Screw,

Brake

Roller

3mm

Nut

Shaft,

Take-up

Brake

Lever

Washer

Lever,

Supply

Brake

Supply

Brake

Roller

Screw,

Brake

Roller

3mm

Nut

Shaft,

Supply

Brake Lever

Washer

Switch,

Automatic

Shut-off

(6P

Slide

Switch)

—

12

Parts

No.

172.012b

O12c

013a

013b

013¢

013d

013

Ol4a

Ol4b

Ol4e

Ol4d

Ol5a

015b

O15c

Ol6a

016b

O16¢

Ol7a

017b

018a

018b

018¢

018d

019a

019b

019¢

020

021

Nomenclature

Plate,

Automatic

Shut-off

Switch

Screw

Semi-Cubic

3x5

Micro

Switch

M83

Holder,

Switch

Screw

Semi-Cubic

3x5

Screw

Flat

Mould

3x15

Washer

Switch,

Speed

Change

(6P

Slide

Switch

NC)

Plate,

Speed

Change

Switch

Screw

Flat

Mould

4x10

Cord

Support

Idler

Wheel

Washer

Internal

Wheel

Washer

Lever,

A

Shaft,

Lever

A

Lever,

B

Cam

Roller,

A

Cam

Roller,

B

Washer

Lever,

C3

Washer

Lever,

D

Lever,

E-2

Lever,

FA

Cam

Roller,

A

Washer

Lever,

G

Holder,

Lever

G

Metal

Stopper,

Lever

G

Lever

G

Metal

Lever,

H-C

Idler

Shaft,

B

Lever

K

Screw

A

Lever

F,

for

Motor

Fiber

Washer

Prop,

Panel

Spring

Pin,

B

Spring

Holder

Hum

Bucking

Coil,

for

Left

Channel

Parts

No.

172.030b

Nomenclature

Hum

Bucking

Coil,

for

Right

Channel

Holder,

Hum

Bucking

Coil

Screw

Semi-Cubic

3

x

22

Lever,

Belt

Change

Metal

Fitting,

Belt

Change

Lever

Spring,

Belt

Change

Lever

Table,

Lifter

Spork,

for

Lifter

Cam

A,

Head

Lifter

Cam

B,

Head

Lifter

Spring

A

Spring,

UN-D

Spring,

D

Spring,

E

Spring,

Idler

New

Spring

D

Torsion

Spring

Spring,

B

Spring,

Belt

Change

Spring

B,

Belt

Change

Motor,

Complete

Screw

Flat

Mould

3x15

Stepped

Pulley

Belt

Holder

Motor

Pulley

Oil

Retainer

Motor

Holder

Motor

Fan,

D

MP

Condenser

2uf

(260VAC)

Holder,

Motor

Condenser

Prop,

Motor

8x

22.5

Prop,

Motor

8x

21.5

Screw

Flat

Mould

4x50

Screw,

without

Head

4x5

Screw

Bind

3x5

Hexagonal

Nut

Flywheel,

Complete

Capstan

Main

Metal

Case

Flywheel

4mm

Ball

Bearing

Plate

C,

Flywheel

Washer

Wing

Nut

Sctew,

Flywheel

adjust

Prop

B,

Flywheel

Prop

C,

Flywheel

Drive

Belt

Switch

Block

Knob,

Record/Playback

&

Rewind

Fast

Forward

Screw

Parts

No.

175.001c

o0ld

O0le

ooif

oolg

01h

oti

001j

001k

ool

001m

001n

0010

O0lp

001q

o01r

O0ls

Olu

Oly

A2

A3

A4

AS

A6a

A6c

17-AK13

AKI4

Nomenclature

Cam

A

Cam

B

8mm

Ball

Bearing

Switch

Table,

A

Lever,

I

Fast/Forward

Rewind

Shaft

RC/Playback

Rewind

Shaft

Plate,

Cam

Spring,

K

Cam,

C

Switch

Table,

B

Record/Playback

Conversion

Spork

Cam

Washer

Prop

Screw

Bind

3x5

Screw

Nut

CASE

Cabinet,

Complete

Table,

Rubber

Foot

Rubber

Foot

Screw

Semi-Cubic

3x

18

Ventilator

(Panel

Escucheon)

Screw

Truss

6x12

Ventilator,

A

Screw

Truss

6x12

Ventilator,

B

Screw

Truss

6x12

Prop

G,

Reel

Russ

Plate,

Speaker

Chassis

A,

Speaker

Chassis

B,

Speaker

5x7"

Screw

Flat

Mould

4x

12

Speed

Nut

AMPLIFIER

Amp.

Chassis

1700

Name

Pla:e

Amplifier

Knob,

A

(Tone)

Amplifier

Knob,

B

(Volume)

Angle,

changing

Voltage

Screw,

without

Head

4x

6.5

Screw,

without

Head

4x

11.5

Screw,

Semi-Cubic

4x8

G.R.

Compound

Body

C.R.

Compound

Body

—B—

Parts

No.

17-C2

C3

C4

cS

C6

C7

C8

co

C10

cil

C20a-b

cai

C22

C23,

C24

17-R1

R2

R3

Rt

RS

R6

R7

RB

RQ

R10

RIL

R12

R13

Ri4

R15

R16

R18

R19

R20

Rl

R22

R23

R24

17-VR1-2

VR3

VR4

Nomenclature

Mica

Condenser

101J

500

WV

Ceramic

Condenser

0.02

P

500

WV

Ceramic

Condenser

0.02

P

500

WV

Oil

Paper

Condenser

0.05

M

400

WV

Ceramic

Condenser

0.02

P

500

WV

Ceramic

Condenser

0.01

P

500

WV

Ceramic

Condenser

0.02

P

500

WV

Ceramic

Condenser

0.02

P

500

WV

Ceramic

Condenser

0.002

P

1KWV

Ceramic

Condenser

0.02

P

500

WV

Tubular

Type

Electrolytic

Condenser

50

pf

25

WV

Mica

Condenser

101J

500

WV

Mica

Condenser

151J

500

WV

Mica

Condenser

500J

500

WV

Lug

Terminal

Type

Electrolytic

Condenser

40-+40

pf

350

WV

Tubular

Type

Electrolytic

Condenser

40

uf

350

WV

Tubular

Type

Electrolytic

Condenser

20

pf

300

WV

Tubular

Type

Electrolytic

Condenser

10

pf

15

WV

Tubular

Type

Electrolytic

Condenser

10

pf

10

WV

Fixed

Resistor

1/4P

500KQ

Fixed

Resistor

1/4P

3KQ

Fixed

Resistor

1/4P

2.2MQ

Fixed

Resistor

1/2P

250KQ

Fixed

Resistor

1/2P

100KQ

Fixed

Resistor

1/4P

2KQ

Fixed

Resistor

1/2P

250KQ

Fixed

Resistor

1/4P

500KQ

Fixed

Resistor

1/4P

20KQ

Fixed

Resistor

1/4P

1MQ

Flexible

Resistor1W

8Q

Fixed

Resistor

1/4P

2002

Fixed

Resistor

1/4P

10KQ

Fixed

Resistor

1/4P

500

KQ

Fixed

Resistor

1/4P

500KQ

Fixed

Resistor

1/4P

1KQ

Wired

Resistor

1OWL

470

Q

Wired

Resistor

10WL

470

Q

Fixed

Resistor

1L

10KQ

Wired

Resistor

3WL

180Q

Flexible

Wired

Resistor

3W

8

Q

Fixed

Resistor

1/4P

10KQ

Fixed

Resistor

1/4P

5002

Variable

Resistor

1

M(A)

50K(A)

Double

VR

Wired

Variable

Resistor

1/2W

1002

Wired

Variable

Resistor

1/2W

1009

Parts

No.

17-SD1

Parts

No.

17-SW2

Nomenclature

Silicone

Diode

SM-150D

Silicone

Diode

SM-150D

Sw3

Fuse

Post

Fuse,

2A

swe

2

Connective

Jack

sws

2

Connective

Jack

2

Connective

Jack

2

Pole

E

Jack

2

Pole

E

Jack

3

Pole

E

Jack

SW6é

Power

Transformer

Out-put

Transformer

Oscillator

Coil

Choke

Transformer

VU

Meter

Pilot

Lamp

Socket,

Swan

Type

Rotary

Switch

(Record/

Playback

Conversion)

Nomenclature

6P

Slide

Switch,

with

White

Knob

(Meter

Conversion)

6P

Slide

Switch,

with

White

Knob

(Speaker

ON/OFF)

8P

Slide

Switch

(Track

Selector)

Toggle

Switch

(Power

ON/OFF)

6P

Slide

Switch,

with

Black

Knob

(50/60

cycle

change)

Parts

No.

17-VS3

VS4

52L2

Lug

Plate

42L1

Lug

Plate

41L2

Lug

Plate

SILI

Lug

Plate

2L1

Lug

Plate

Vacuum

Tube

12AT7

Vacuum

Tube

12AT7

Vacuum

Tube

6BM8

Vacuum

Tube

6BM8

Vacuum

Tube

Socket,

9P

mould

type

Vacuum

Tube

Socket,

9P

mould

type

Nomenclature

Vacuum

Tube

Socket,

9P

mould

type

Vacuum

Tube

Socket,

9P

mould

type

Transformer

Angle,

Left

Transformer

Angle,

Right

Name

Plate,

Cycle

Change

Socket,

change

Voltage

Hexagonal

Prop,

Selector

Name

Plate,

change

AC

3mm

Nut,

special

Cord

Support

Rubber

Bush,

AC

Cord

AG

Cord

Plate

A,

Jack

Plate

B,

Jack

Clamp

Pin,

for

6BQ5

Clamp

Pin,

for

12AT7

Screw

Semi-Cubic

4x

8

Screw

Semi-Cubic

3x

6

Screw

Flat

Mould

4x

16

Screw

Semi-Cubic

3x

6

X

EXPLODED

VIEW

OF

COMPONENT

PARTS

Front

Panel

171-002:

171-00:

171-001

gn,

Parts

No.

17-SD1

SD2

17-FL

FZ

17-PL1

PL2

Nomenclature

Silicone

Diode

SM-150D

Silicone

Diode

SM-150D.

Fuse

Post

Fuse,

2A

2

Connective

Jack

2

Connective

Jack

2

Connective

Jack

2

Pole

E

Jack

3

Pole

E

Jack

y

2

Power

Transfor:

Out-put

Transformer

Oscillator

Coil

Choke

ransformer

VU

Meter

Pilot

Lamp

Socket,

Swan

Type

Switch

(Record

Playback

Conversion

17-TBL

TB2

TBS

TBE

TBS

17Vla

Vib

V2a

V2b

nenclature

6P

Slide

Switch,

with

White

Knob

(Meter

Conversion)

6P

Slide

Switch,

witk

White

Knob

(Speaker

ON,

8P

Slide

Switch

(Track

Selector)

Toggle

Switch

(Powe!

ON/OFF)

6P

Slide

Switch,

with

Black

Knob

(50/60

cycle

change)

52L2

Lug

Plate

42L1

Lug

Plate

41L2

Lug

Plate

31L1

Lug

Plate

QL1

Lug

Plate

Vacuum

Tube

12AT7

uum

Tube

12417

acuum

Tube

6BM8

Vacuum

Tube

6BM8

Vacuum

¢

Socket,

9P

mould

Vacuum

Tube

Socket,

9P

mould

t

Parts

No.

17-VS3

VS4

17-Z1

Z3

Nomenclature

Vacuum

Tube

Socket,

9P

mould

type

Vacuum

Tube

Socket,

9P

mould

ty

Transformer

Angle,

Left

Transformer

Angle,

Right

Name

Plate,

Cycle

Char

Socket,

change

Voltage

Hexagonal

Prop,

Selector

Name

Plate,

change

AC

3mm

Nut,

special

Cord

Support

Rubber

Bush,

AG

Cord

AC

Co:

Plate

A,

Jack

Plate

B,

Jack

Clamp

Pin,

for

6BQ5

Clamp

Pin,

for

12AT7

Screw

Semi-Cubic

4x8

i-Cubic

3x

6

Screw

Mould

4x

16

Screw

Semi-Cubic

3x

6

Screw

X

EXPLODED

VIEW

OF

COMPONENT

PARTS

Front

Panel

171-002

171-003

171-001

etary

oat

171-004

171-006

Amplifier

I

-009,

176-0088

176-009a

176-010

<<

ol

176-0086

Amplifier

II

476-010.

a8

A

176-010

176-008b

oO

O-Ll

"O-LI

“mg-ii

"UA-LI

zx

YIV-LI

“nye

Ld

"O-L1

1

O-LI

MR

OrL

2

9-L1—

010-921

aes

&

q800-

LI

yp

Pee

010-9L1

ZL

O-LI

“TL

2

‘Y

=

MS-L1

—

mee

:

‘“

HepeLl

HORE

"TFL

f-LI

*MS-LI

WELT

Tl

seyyduy

Case

|

176-002a

176-004a

=

176-002a

=

176-002c

176-006

176-002b

176-0040:

Case

II

176-002c

176-005a

-007

Mee

176-001

176-004a:

Case

Ill

176-002b

176-003a

7

=

Akai 1700 User manual

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