Teac AN-80 - Page 8

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Place

the

L

channel

PLAY

CAL

variable

resistor

of

the

AN-80

in

the

fully

clockwise

position

and

set

the

MODE

switch

to

PLAY.

Set

the

AF

oscillator

frequency

at

100

Hz

and

the

output

voltage

at

-20

dB

(0

dB

=

0.775

V).

Adjust

the

ATT

so

the

AN-80

level

meter's

pointer

will

indicate

the

reference

level.

At

this

point,

read

the

output

level

on

the

voltmeter

and

let

this

value

be

0

dB.

Set

the

AF

oscillator

frequency

at

3

kHz

and

apply

20

dB

attenu-

ated

signal,

using

the

ATT.

;

Adjust

VR-101

so

the

AC

voltmeter

will

indicate

-27

dB.

VR-101

and

VR-103

will

interact

with

each

other,

coordinate

or

alternate

their

adjustment

until

the

specified

value

is

obtained

at

the

respective

points.

Note

that

0

dB

also

is

affected.

Set

the

AF

oscillator

frequency

at

5

kHz

and

apply

30

dB

attenuated

signal,

using

the

ATT.

Adjust

VR-103

so

that

AC

voltmeter

will

indicate

-40

dB.

After

L

channel

adjustment,

change

connections

to

R

channel,

set

the

R

channel

MODE

switch

to

PLAY

and

the

METER

switch

to

R.

Repeat

the

same

procedures

for

R

channel.

(VR-102/104)

Multiplex

Filter

Adjustment

When

an

FM

tuner

is

used

as

a

program

source,

the

AN-80

could

mal-

function

because

of

the

leak

carrier

of

the

FM

multiplex

circuit.

To

eliminate

this,

the

AN-80

has

a

built-in

filter

circuit.

The

procedure

for

adjusting

this

filter

circuit

follows.

Connect

the

devices

as

shown.

Set

the

MODE

switches

to

REC.

Set

the

AF

oscillator

frequency

at

100

Hz

and the

output

voltage

at

-20

dB

(O

dB

=

0.775V).

Adjust

the

ATT

so

the

AN-80

level

meter's

pointer

will

indicate

the

reference

level.

At

this

point,

read

the

output

level

on

the

voltmeter

and

let

this

value

be

O

dB.

Set

the

AF

oscillator

frequency

at

19kHz+1%

or

less

and

adjust

L-103

for

a

minimum.

After

L

channel

adjustment,

change

connections

to

R

channel

and

set

the

METER

switch

to

R.

Repeat

the

same

procedures

and

adjust

L-104

for

a

minimum.

(L-101

and

L-102

need

not

be

adjusted.)

lo

fees]

EIfo|-|>

°

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