Korg A4 User Manual

<7.
DSP CHECK
>
(1)
Here,
the
main
board’s
DSPs (IC10,
IC11)
and
D_RAM
(IC15,
IC16)
are
checked.
(2)
Connect
the
oscilloscope
to the
rear
panel
OUTPUT,
and
turn
the
OUTPUT
volume
to
MAX.
(3)
Press
[WRITE],
and the
check
will
proceed
as
shown in
the
table
below.
Confirm
that the
waveform is
the
same
as that
shown in
the
figure.
DISPLAY
A4
GTR(B)
OUTPUT
when
no
good
P4-1 DSP
(KLM-1597
ICll)test
OUT
L
Check
IC11
and
analog
circuit.
P4-2 DSP
(KLM-1597
ICll)test
OUT
R
Check
I
Cl
1
and
analog
circuit.
P4-3
DRAM(KLM-1597
1C15,
16)test
OUT
L
Check
IC11,
IC15
and IC16.
P4-4
DSP
(KLM-1597
IC10)test
OUT L
Check
IC10
and
1C11.
P4-5
DSP
(KLM-1597
IC10)test
OUT
R
Check
IC10
and
IC11.
Figure 1
(4)
When
the
checks
are
completed,
press
[WRITE]
to
proceed to
the
next
check
item.
<8.
TUNER
FUNCTION
CHECK
>
(1)
Here
the
TUNER
function
is
checked.
Connect
the
rear
panel
INPUT
jack
to
the oscillator.
(2)
Set
the
INPUT
volume
and
OUTPUT
volume
on
the
panel to
MAX.
(3)
Input
a
short
wave
27.5Hz/10mVp-p
to
the
INPUT
jack
and confirm
that
the
TUNER LED
0
(green)
on
the panel
lights
up.
(4)
Input
a
short wave
2093.005003Hz/10mVp-p
to
the
INPUT
jack
and
confirm
that
the
TUNER
LED
0
(green) on
the
panel
lights
up.
A4
GTR(B)
TUNER
Function
27.5Hz
/10mVp-p
2093.
005003Hz/10mVp-p
TUNER
<0>
lit
TUNER
<0>
lit
(5)
When
this
check
is
completed,
press
[MODEA]
to
proceed
to
the
next
item
to
be
checked.
16

Korg A4 Specifications

General

Brand	Korg
Model	A4
Category	Amplifier
Language	English