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¢-3RX

5-6-2

DECODER

ADJUSTMENT

|

1,

Preset

all

adjustors

approximately

to

the

center

position.

8.

Repeat

above

steps

5

to

7

until

the

best

results

are

obtained.

2.

Make

the

Fig.

5-17.

connections,

then

feed

100

Hz,

—8

dB

(308

9.

Check

that

when

the

input

signal

is

100

Hz/—8

dB

(308

mV),

mV)

to

the

F/I

(INPUT)

terminal.

then

10

kHz/—8

dB,

the

output

signal

from

H/J

(OUTPUT)

3.

Adjust

R77/R87

to

obtain

a

clear

200

Hz

sine-wave

on

the

terminal

deviates

by

—1

dB

+0.5

dB,

then

+5.5

dB

+0.5

dB

from

oscilloscope.

See

Fig’s

5-12

and

5-13.

—8

dB

(reference),

respectively

...

$0

that

output,

as

a

voltage

4.

Change

the

connections

to

Fig.

5-18,

then

feed

a

1

kHz/—8

dB

value,

should

be

652

mV

to

731

mV

for

100

Hz,

and

1.38

V

(308

mV)

input

signal

to

the

INPUT

terminal.

Adjust

R73/R83

to

1.55

V

for

10

kHz.

so

that

AC

voltmeter

reads

—8

dB

(308

mV).

10.

Check

that

when

1

kHz/—38

dB

(9.75

mV)

is

applied,

the

out-

|

5.

With

the

conditions

in

step

4,

adjust

R71/R81

for

minimum

put

is

—68

dB

+7

dB

(275

pV

to

346

pV).

|

distortion

(0.1%

or

less).

11.

Check

that

when

the

input

signal

is

1

kHz,

+2 dB

(0.975

V),

the

|

6.

Like

Fig.

5-19',

connect

a

DC

voltmeter

between

TP5

and

TP13

output

is

+12

dB

+1

dB

(2.75

V

to

3.46

V)

and

the

distortion

for

L-ch

(or

TP7

and

TP15

for

R-ch),

then

note

the

reading

on

factor

is

0.3%

or

less.

the

DC

voltmeter

with

an

input

signal

of

1

kHz/—8

dB

(308

mV).

7.

Cut

off

the

input

signal,

connect

TP6/TP8

to

the

E

(0

V)

termi-

nal,

then

make

the

same

measurement

as

in

step

6

to

adjust

R72/R82

for

the

same

level.

Low

distortion

:

AF

OSCILLATOR

AC

VOLTMETER

OSCILLOSCOPE

Distortion:

0.02%

or

less

Output:

3V

or

more

NOTE:

Lech

(Rech)

Fig.5-17

Connections

for

DECODER

adjustment

(1)

Low

distortion

:

AF

OSCILLATOR

.

AC

VOLTMETER

OSCILLOSCOPE

ATTENUATOR

DBX

PCB

Distortion:

0.02%

or

less

Output:

3V

or

more

DISTORTION

ad

METER

NOTE:

Lch

(Rch)

Fig.

5-18

Connections

for

DECODER

adjustment

(2)

Low

distortion

AF

OSCILLATOR

DC

VOLTMETER

Distortion:

0.02%

or

less

Output:

3V

or

more

NOTE:

Lch

(Reh)

Fig.

5-19

Connections

for

DECODER

adjustment

(3)

17

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