Teac C-3RX - DBX Operation and Performance Testing

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C-3RX

|

12

;

MEASURING

ADJUST

POINT:

(or

CHECK)

ITEM

SETTING

INPUT

SIGNAL

RESULT

e

Connection:

Fig.

5-1,

but

engage

1-kHz

filter.

e@

Record

a

1-kHz

signal.

Push

REC

MUTE

button

for

several

seconds.

Rewind

and

play

the

tape.

Find

the

difference

between

the

1-kHz

portion

and

the

“no-signal’’

portion.

.

REC

MUTE

function

LINE

IN:

BIAS,

EQ:

Co(CrO2)

Ba

OUTPUT:

Ref.

output

Tape:

MTT-506I

tT

65

dB

min.

ratio

SeHEEatA

no

signal

e

Connection:

Fig.

5-1,

but

do

not

connect

LINE

IN

(R),

and

engage

1-kHz

filter.

@

Set

the

deck

to

record

mode.

Find

the

difference

between

the

1-kHz

recorded

portion

(L-ch)

and

the

“no

signal’

portion

(R-ch).

.

Channel

separation

LINE

IN:

ye

BIAS,

EQ:

Co(CrO2)

L-ch

1

kHz/—9

dB

OUTPUT:

Tape:

MTT-5061

(275

mV)

35

dB

min.

ratio

R-ch_

No

signal

e

Connection:

Fig.

5-1,

but

do

not

connect

LINE

IN

(L)

and

OUTPUT

(L).

e

Record:a

125-Hz

signal

on

R-ch

and

note

output

level.

Invert

tape

and

play

R-ch

track.

Check

leakage

level

against

the

output

reference

of

previously

recorded

portion.

LINE

IN:

f

L-ch

No

signal

OUTPUT:

R-ch

125

Hz/—9

dB

40

dB

min.

ratio

(275

mV)

21.

Adjacent

track

crosstalk

BIAS,

EQ:

Co(CrO)

Tape:

MTT-5061

@

Record

a

1-kHz

signal

with

NR

SYSTEM

switch

OUT,

Play

this

portion

with

NR

SYSTEM

switch

set

to

OUT

and

set

to

NR.

Obtain

the

difference

in

output

level

between

OUT

and

NR

positions.

Repeat

the

above

process

using

a

10-kHz

signal.

OUTPUT:

DOLBY

NR

effect

BIAS,

EQ:

Co(Cr02)

LINE

IN:

"UT

Tape:

MTT.5061

1

kHz/—29

dB

Variation

of

Pe:

(27.5

mV)

3

dB

to

8dB

OUTPUT:

Variation

of

8

dB

to

12

dB

BIAS,

EQ:

Co(CrO2)

LINE

IN:

;

10

kHz/—39

dB

©

Tape:

MTT-5061

(8.69

mv)

BIAS,

EQ:

Co(CrO2)

INPUT:

TEST

:

Tape:

MTT-5061

_

ADJUST/PRE-SET

sw.:

R35/R45

fully

CCW

(

O

)

R30/R40

fully

CW

(>)

Record-pause

mode

1

kHz/—-29

dB

RECORD

cont's

|

OUTPUT:

MONITOR

sw.:

SOURCE

(27.5

mV)

(L/R)

—25

dB

(43.6

mV)

Record-pause

mode

ry

eee)

dB

PEAK

LEVEL

meter:

MONITOR

sw.:

SOURCE

(27.5

mv)

0

dB

+2

dB

While

rotating

R35/R45

trim-pots

clock-

wise,

check

that

the

difference

in

OUTPUT

level

between

the

setting

where

R35/R46

a

maximum

output

value

is

obtained

and

when

the

trim-pot

is

set

fully

clockwise

is

more

than

4

dB.

Set

R35/R45

in

the

position

correspond-

ing

to

maximum

output

value.

Check

that,|

R30/R40

when

R30/R40

is

rotated

from

fully

CW

variable

range

Position

to

fully

CCW

position,

OUTPUT

|

checks

level

is

reduced

by

more

than

10

dB.

:

OUTPUT:

Record-play

mode

en

eae

aB

Equal

level

with

;

MONITOR

sw.:

TAPE

{

(27.5

mV)

sap

eetebes

switch,

SOURCE

TAPE

and

SOURCE

LINE

IN:

ADJUST

LINE

IN:

Check

LINE

IN:

1

kHz/—29

dB

(27.5

mV)

Record-play

mode

MONITOR

sw.:

TAPE

variable

range

checks

23.

BIAS/REC

CALIBRATION

(on

front

panel)

LINE

IN:

1

kHz/—29

dB

(27.5

mV)

Record-play

mode

MONITOR

sw.:

TAPE

R30/R40_

;

OUTPUT:

Record-play

mode

400

Hz/—29

dB

MONITOR

sw.:

TAPE

6.3

kHz/—29

dB

RSeihae

es

poral

gata!

12.5

kHz/—29

dB

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