Korg X3 Service Manual page 21

step
4
Checking disk change
-
Check that the LCD goes froi
HI
to
LOW when the floppy disk drive
eject button
is
pressed and
the disk
is
taken
out.
After you have completed this check, press CENTER] and proceed
to
the next test.
<MDE Test> External
TestiJ03
-
Testing
the MDE part of TGL
Press CENTER] and check that the output waveform
of
the MDE Test
(Fig.
1) is
normal.
If
the output waveform
is
abnormal, check the TGL
and
neighboring analog circuits.
After you have completed this check, press CENTER] and proceed
to
the next test.
<Noise Test>
External TestW04
Set the MASTER
VR on the panel to MAX.
-
Press [ENTER]
and
measure the noise level of the OUTPUT indicated
on the
LCD.
Check
that the OUTPUT
noise
level
does
not
exceed
the allowed value.
Measure the noise levels
in
the order shown below
and confirm
if
each
level
is
-87.0CdBu] or less as on the table
1.
OUTPUT L/MONO
OUTPUT
R
PHONE
L
PHONE
R
After you have completed this check, press CENTER] and proceed
to
the next test.
21