Harman Kardon CD301 Owners Manual - Page 11

Operation

Procedures

Bias

Fine

Trim

Feature

The

optimal

recording

bias

rating

of

the

tape

of

each

brand

is

somewhat

different

from

that

of

other

brands.

The

bias

fine

trim

feature

is

provided

to

enable

fine

adjustment

for

such

difference.

The

high

frequency

range

tends

to

be

attenuated

if

the

bias

current

is

higher

than

the

rated

value

for

a

tape

while

it

tends

to

be

boosted

if

the

bias

current

is

less

than

the

rated

value.

This

unit

aims

to

obtain

a

flat

frequency

characteristic

by

recording

400

Hz

standard

signal

in

the

left

channel

and

12.5

kHz

standard

signal

in

the

right

channel,

and

by

ad-

justing

the

BIAS

FINE

TRIM

knob

so

that

both

channels

show

the

same

playback

level.

Operate

as

follows:

1.

Insert

a

cassette

tape

in

the

CASSETTE

COMPART-

MENT

and

place

the

TAPE

SELECTOR

at

the

position

corresponding

to

the

using

tape

type.

2.

Press

the

RECORD

and

PLAY

buttons

together

to

start

the

tape.

With

these

two

buttons

pressed,

tape

recording

starts.

3.

Keep

the

BIAS

TONE

button

pressed.

400

Hz

signal

and

12.5

kHz

signal

are

recorded

in

the

left

and

right

channels,

respectively.

4.

Rewind

the

tape

and

press

the

PLAY

button.

With

keep

pressing

the

BIAS

TONE

button

again,

compare

LED

LEVEL

DISPLAY

left

and

right

channel

readings.

5.

Turn

the

BIAS

FINE

TRIM

knob

clockwise

or

counter-

clockwise

according

to

comparison

of

right

channel

level

indication

with

respect

to

left

channel

level

indication.

Repeat

steps

2

through

4

after

that.

When

the

right

channel

level

is

higher

OdB

0dB

4,KtMe

1

Left

channel

(400

Hz

recording)

•

Right

channel

(12.5

kHz

recording)

hi

cut

hi

boost

Turn

the

knob

counterclockwise

When

the

right

channel

level

is

lower

OdB

I

I

I.

0dB

I

1

I I

I

Left

channel

Right

channel

(400

Hz

recording)

(12.5

kHz

recording)

hi

cut

hi

boost

Turn

the

knob

clockwise

6.

For

tape

playback,

repeat

steps

2

through

5

so

that

the

right

channel

reading

equals

to

left

channel

reading.

Record

Calibration

Feature

Each

tape

has

different

sensitivity.

As

a

result,

the

playback

level

may

be

deviated

from

the

LED

LEVEL

DISPLAY

reading.

The

record

cal

ibration

feature

adjusts

the

LED

LEVEL

DISPLAY

reading

tape

so

as

to

enable

proper

recording

and

playback

level

setting.

This

is

especial

ly

important

for

recording

with

the

Dolby

NR

system.

Operate

as

follows:

1

.

Insert

a

cassette

tape

of

the

type

which

is

most

fre-

quently

used

into

the

CASSETTE

COMPARTMENT.

2.

Press

the

TAPE

SELECTOR

according

to

the

tape

type.

3.

Press

the

RECORD

and

PLAY

button

together

to

start

the

tape,

and

keep

pressing

the

RECORD

CALBRA-

TION

TONE

button.

The

LED

LEVEL

DISPLAY

shows

0

dB

and

400

Hz

standard

signal

is

recorded.

4.

Rewind

the

tape

and

press

the

PLAY

button.

If

the

LED

LEVEL

DISPLAY

shows

0

dB,

no

adjustment

is

required.

5.

If

the

indicated

level

is

above

or

below

0

dB,

adjust

the

RECORD

CALIBRATION

controls.

rec,,ES

Ci

to

the

specified

value

for

each

If

the

level

indication

is

lower

than

0

dB

0dB

I

t

I

0dB

record

cal

Turn

the

controls

clock-

wise

with

a

thin

screw-

driver.

if

the

level

indication

is

higher

than

0

dB

0dB

0dB

1•

.:

record

cal

CO'

Turn

the

controls

coun-

terclockwise

with

a

thin

screwdriver.

6.

For

tape

playback,

repeat

steps

3

through

5

until

the

LED

LEVEL

DISPLAY

shows

0

dB.

Note:

Adjustment

to

0

dB

may

be

failed

if

the

used

tape

is

old

or

a

poor

in

quality.

11

Harman Kardon CD301 Owners Manual - Page 11

Feature, Record, Calibration

Page 11 highlights