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Brass (KLM-293)
Offset check and adjustment
1) Set cutoff freq to 0 and measure BR-SIG
OUT
{293-36-1)
using an oscilloscope
(0.1 sec/cm,
0.1V/em).
2) Play any single key and ascertain that the DC
output pulse is within +200mV.
3) If not within tolerances, adjust VR-10.
Note:
Pulse output decreases if a key is played
in rapid sequence.
Therefore,
leave at least a
5-second gap between playing the key.
VCA check and adjustment
1) Set scale to 8', cutoff freq to 10, and other con-
trols to their normal settings. Measure BR-SIG
OUT using an oscilloscope (1 msec/cm, 0.65V/
cm).
2) Play C3 and check sawtooth waveform output
amplitude
to
ascertain
that
it is 0.65Vp-p
{£0.15V) for units O~7.
Resonance check and adjustment
3) If oscillation does not occur at the right point,
set scale 8', 16' to off, cutoff freq to 5, and
resonance
to 8. Then
adjust VR-11
to obtain
0.65Vp-p for the resonance waveform amplitude.
Cutoff FREQ check and adjustment
f = oscillation frequency
Strings (KLM-294)
Gate, filter check and adjustment
4) Check to see that there is a smooth reduction in
waveform
amplitude
for units O~7
when
you
turn KBD filter balance from 10 to 0.
5) With KBD filter balance at 0, play C3 and check
to see the sawtooth waveform amplitude is 0.2V
+0.05Vp-p for units O~7.
7) After finishing, set KBD filter balance to 10.
Bowing check and adjustment
1) Turn on "bowing", "ensemble off" and "vibrato
off' and use an oscilloscope to measure ST-SIG
OUT (294-35-12).
2) Play C3 and check to see that you obtain the
following
outputs
with
level
and
tone
at the
settings listed.
LEVEL=10
TONE =10
LEVEL=
0
TONE =10
|
LEVEL=
5
TONE =3~4
LEVEL=5
TONE
=O
3) If not within tolerances, adjust VR-6 (Q), VR-7
(gain), and VR-8 (f,) as necessary.
4) After finishing, set bowing to off, level to 10,
and tone to 10.
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