Akai AJ-P4270R Service Manual download pdf (Page 10)

6-3.

BALANCE

OF BBD

OUTPUT

ON

THE

CHORUS

PC

BOARD

J2

J3

ICI3

TPI

>IC4l

>

IC5

>

ice

I

>

ic9

I

IC10

VR2

I

BALANCE

■

I

kHz

AUDIO

SIGNAL

FROM

OSC

•L

CLIPPING

LEVEL

CLIPPING

LEVEL

Fig.

6-3

CHORUS

PCB

Adjustment

Points

and

Instrument

Connection

Fig.

6-4

1)

Set

CHORUS

switch

to

"2".

2)

Connect

an

oscilloscope

between

TPI

and

GND

on

the

CHORUS

PC

Board.

3)

Connect

an

Audio

Signal

Generator

to

Pin

[I]

and||]

of

connector

PI

on

the

CHORUS

PC

Board,

and

supply

1

kHz

Audio

Sine

wave

signal,

and

Adjust output

level

control

of

Audio

Generator,

so

that

the

waveform

on

the

oscilloscope

is

clipped

a

bit.

4)

Adjust

VR1

so

that

the

Clipping

level

at

upper

side

and

lower

side

of

the

waveform

are

the

same

clipping

level.

5)

Connect

an

oscilloscope

between

TP2

and

GND,

and

adjust

VR2

as

same

manner

as

VR1.

6-4.

OFF-SET

OF

IC6

(LF356)

ON

THE

CPU

PC

BOARD

\

VR

I

/off

set

□

Fig.

6-5

CPU

PCB

ADJUST

POINT

1)

Set

to

center

position

of

VR1

on

the

CPU

PC

Board.

SERVICE

MANUAL-

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