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Use
the
settings
listed
below
for
the
check and adjustment
procedures.
For convenience,
save these
settings
on
tape
so that
they can
be loaded quickly the next
time
DW-6000
servicing
is
required.
RESET SWITCH
Fig-1
You
should
have
received
the
DW-6000
voice display
card
by
separate
mail.
This
is
used to
show
which
voice
is
operating
when
keys
are
played
on
the
keyboard.
(See
figure
1
.)
Turn
off the
power on
the
DW-6000
and connect
the
card's
1C
clip
to
IC7
(40H374) on
the
KLM-653
board.
Be
sure that the
"1" marked on
the
clip
is
at
the IC7
number
1
pin
side.
If
the
DW-6000
or the voice display card
starts
behaving
erratically,
reset
the card
by
pressing
its
reset
button.
(And
reset
the
DW-6000
by
turning
its
power
off
and on
again.)
Be
sure to turn off the
power on
the
DW-6000
before
removing
the voice display
card.
1.
D/A
converter
(DAC)
reference
voltage
check and
adjustment.
(KLM-654)
1)
.
Connect
a digital
voltmeter
(DVM)
to the
KLM-654
D/A
check
point
(or
IC1
[4558] 7
pin)
(connect
ground
to
C31
GND
side),
confirm
a
reading
in
the range
of
1.995V
~2.005V.
2)
Adjust
VR2
if
necessary
to
obtain
a
value that
meets
the
above
specification.
ground
side).
Confirm
a
DWGS
clock
frequency
within the
range of
6,395kHz~6,405kHz.
2)
Adjust
VR1
if
necessary.
3.
OSC1
(oscillator 1)
VCA
level
check and adjustment
(KLM-655)
1)
Connect
an
oscilloscope
to the
KLM-655
test
point
(ground
goes
to
C6
GND
side).
2)
Select
program
number
1
1
.
3)
Play
key
C3
and confirm
a
waveform
level
of
0.5V
p-p
(±20mV
p-p)
(fig-2).
0.5V ±
20mV
Fig-2
4)
Check
all
six
voices
in
the
same way.
5)
If
a
voice
does not
meet
the
level
specification, adjust
it
by
turning
its
VCA
adjustment
VR:
No.
2, 7,
12,
17,22,
or 27.
2.
DWGS
Clock check
and
adjustment.
(KLM-654)
1
)
Connect
a
frequency counter
to the clock
adjustment
test
point
or
IC45 (LS04)
6-pin
(ground
goes to
C104
—
30
—
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