Korg wavestation Service Manual page 32

4.
DF88
(
VDF
)
TEST
Confirm
the waveform like
fig. 2 is
transmitted
and
it
changes according to
the passing of the time by dint of
DF88-
It
repeats the movement
as it
changes from Sin Wave
to Saw Wave and
becomes the level
0-
If
this test
is
N.
G.
,
check DF88
(
MB87727
)
and the circuit between DF88
and
MDE-
If
this test
is O.K.,
press MARK/JUMP SW
to proceed to TEST
4
OUTPUT NOISE
TEST.
«
TEST
4
:
OUTPUT NOISE TEST
»
1.
Select the output with SKEY1
~
SKEY6 and measure the noise level with
a
noise
meter.
The following
is
the correspondnce
of
each SKEY
to each output.
SKEY1
SKEY3
SKEY5
Output-1
SKEY2
Output-3
SKEY4
Phone-L
SKEY6
0utput-2
0utput-4
Phone-
2-
Confirm the noise
level of each output
is
less than the regulation.
If
this test
is O.K., press MARK/ JUMP SW to proceed
to
TEST
5
OUTPUT
DISTORTION
TEST.
OUT-1
less
than
-87.0dBm
OUT-2
less
than
-87.0dBm
OUT-3
less
than
-86.0dBm
OUT-4
less
than
-86.0dBm
PH-L
less
than
-87.0dBm
PH-R
less
than
-87.0dBm
«
TEST
5
:
OUTPUT DISTORTION TEST
))
1.
Select the output signal as well
as
TEST
4
and measure the level and
the
distortion
of signal.
The way
to select the signal
is
the same
as
TEST
4.
2.
Confirm that the signal level
of
each output
is
within the regulation,
there
is
no
distortion
and that the frequency of each output signal
is
normal.
If
this test
is
0.
K.
,
press MARK/ JUMP SW
to proceed to TEST
6
KEYBOARD
AFTERTOUCH
TEST.
34