Akai 1700 Service Manual

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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.

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Akai 1700 Specifications

General

Brand	Akai
Model	1700
Category	Tape Deck
Language	English

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