Korg Wavestation - LCD Pixel Test; MDE, DF88, TG88 Component Tests

Then, the indication changes
to
"
MARK/JUMP
TO
NEXT
".
After the
Encoder
Test is finished
normally,
press MARK/
JUMP
SW
to
proceed
to TEST 2 LCD PIXEL TEST.
«
TEST2
:
LCD PIXEL TEST
»
1.
Confirm that all the dots
in the LCD
light.
At
this
time
check that
there is
no
patches,
etc. in
the
LCD
and
that
the
contrast
changes according
as the
contrast
VR
is
turned.
If
nothing
is
wrong with
the
LCD, press
MARK/JUMP
SW
to
proceed
to the
next.
2.
Confirm
that all the
dots in the
LCD
go out.
If
nothing is wrong
with
the LCD,
press MARK/
JUMP
SW
to
proceed
to
TEST
3
MDE/DF88/TG88 TEST.
((
TEST 3
:
MDE/DF88/TG88
TEST
})
Connect an
oscilloscope
with
OUTPUT 1 and
turn
the
master
VR
of
WS1
to
the
MAX.
1.
MDE TEST
Press SKEY1
and
carry out
the MDE
TEST.
(
Once TEST
3
starts, this
condition
appears
automatically. )
Confirm
that the
waveform
like fig-
1 is
transmitted.
If this test
is N.
G.
, check
MDE
(
MB87405
),
D/A
Converter
(
PCM54HP
)
and
the
analog
circuit-
If
this
test is
O.K.,
press
MARK/
JUMP SW
or
SKEY
2
to
proceed
to DF88
(
VDA
)
TEST.
2.
DF88 (
VDA
)
TEST
Confirm
that the
waveform
like fig.
2 is
transmitted,
its level
changes
according
to the
passing
of the
time by
dint of
DF88
(
VDA
)
and
that
the minimum
becomes
0.
If
this test is N. G.
,
check DF88 (
MB87727 )
and the
circuit between
DF88
and MDE-
If this
test is
0.
K. ,
press
MARK/
JUMP
SW
or SKEY
3
to
proceed to TG88
TEST.
3.
TG88 TEST
Confirm the
waveform like
fig.
2 is
transmitted
and its level, pitch, etc
do
not change.
If
this test is N. G. ,
check
TG88 ( MB87726
),
WAVE ROM
and
the circuit
between TG88 and
DF88.
If this test
is O.K.,
press MARK/
JUMP SW
or
SKEY4 to proceed to DF88
(
VDF
)
TEST-
33