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5.4.7

Recording

level

adjustment

1

1)

Proceed

to

the

following

adjustments

only

after

checks

and

adjustments

in

the

previous

Sections

5.4.1

n,

5.4.6

have

been

completed.

Set

the

front

panel

NR

INT/EXT

switch

to

EXT.

2)

Load

a

blank

tape

(Ampex

#456

or

Scotch

#226}

on

the

transport

and

apply

an

audio

oscillator

output

of

IKHz,

-lOdBV

(0.3V)

to

the

INPUT

jack

on

the

recorder

rear

panel.

Also,

plug

in

a

level

meter

to

the

OUTPUT

jack.

Using

TRACK

1

as

an

example,

the

connector

number

is

"1"

for

both

INPUT

and

OUTPUT

jacks.

3)

Depress

the

RECORD

TRACK

1

button,

then,

depress

the

RECORD

and

PLAY

buttons

to

put

TRACK

1

in

the

record

mode.

when

in

the

record

mode,

the

meter

will

indicate

the

input

level

regardless

of

the

position

of

the

input

button.

Check

to

see

that

the

reading

of

this

meter

is

OdB

±ldB.

4)

It

will

be

convenient

to

rewind

the

tape

to

the

start

if

the

tape

index

counter

reset

button

is

depressed,

at

start

of

recording,

to

return

the

display

to

0000



5)

After

recording

a

certain

length

of

IKHz,

OdB

signal,

depress

the

ZERO

RTN

button

I

to

rewind

tape

to

the

starting

point,

put

the

transport

in

the

PLAY

mode

and

check

the

meter

reading.

The

MONITOR

switch

must

be

at

TAPE.

In

normal

condition,

the

meter

reading

is

OdB

±ldB.

If

response

is

off

spec,

correct

by

adjusting

REC

LVL

R-105.

5KI1B.

Repeat

this

procedure

for

the

remaining

tracks

2

v

16.

5.4.

0

Overall

frequency

response

1)

With

the

rear

panel

NR

INT/EXT

switch

at

EXT

and

under

the

measurement

setup

of

the

previous

Section

5.4.7,

apply

signals

from

40Hz

through

IBKHz

at

-lOdBV

(0.3V)

to

the

recorder

INPUT

jack

and

set

the

NR

switch

to

INT.

To

adjust

TRACK

1,

for

example,

apply

the

signal

to

INPUT

1

and

plug

in

a

level

meter

to

OUTPUT

jack

1.

Put

TRACK

1

in

the

record

mode

to

record

a

certain

length

of

the

signal,

rewind

it

to

the

start,

and

playback

the

tape.

In

normal

condition,

the

frequency

response

in

reference

to

IKHz

is

within

tldB

and

-ldB.

if

response

does

not

fall

within

spec

in

the

high

frequency

region,

correct

it

by

a

slight

rotation

of

the

REC

EQ

pot

R-106,

2K12B

.

2)

Check

and

adjust

the

remaining

tracks

in

the

same

way.

39

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