Korg Trident MK1 User Manual

5. Brass (KLM-293)
(1) 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,
0.1 V/cm).
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.
(2) 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 0^7.
3) If not within tolerances, adjust VR-9 for the unit
in question.
(3) Resonance check and adjustment
1) Set cutoff freq to 7 (leaving other controls at the
normal settings) and use an oscilloscope (1msec/
cm, 0.2V/cm) to measure BR-SIG OUT.
2) Play any single key and check for a smooth in¬
crease in ringing with oscillation at 7^8 as you
turn resonance up from 0 to 10.
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.
(4) Cutoff FREQ check and adjustment
1) Set scale 8', 16' to off and resonance to 10 (leav¬
ing other controls at the normal settings). Use a
frequency counter to measure BR-SIG OUT
(293-36-1).
2) Play any key, set cutoff freq to 0 and check to
see that / is 7Hz or lower. With cutoff freq at 5,
/ should be 180~200Hz. With cutoff freq at 10,
/ should be 5^6kHz.
/ = oscillation frequency
3) If not within tolerances, set scale 8', 16' to off
and resonance to 10; adjust VR-12 to obtain 180
^200Hz when cutoff freq is at 5. Then adjust
VR-8 to obtain 5~6kHz when cutoff freq is at *
10 .
6. Strings (KLM-294)
(1) Gate, filter check and adjustment
1) Turn on both "vibrato off" and "ensemble off"
and check to see that neither vibrato nor en¬
semble are applied to the sound.
2) Use an oscilloscope (1 msec/cm, 0.1 V/cm) to
measure ST-SIG OUT (294-35-12).
3) Set KBD filter balance to 10 and adjust VR-5 to
obtain a sawtooth waveform amplitude of 0.6~
0.8p-p for units 0 ^ 7 .
4) Check to see that there is a smooth reduction in
waveform amplitude for units 0~7 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 0~7.
6) If not within tolerances, adjust VR-28 for the
KLM-317 unit in question.
7) After finishing, set KBD filter balance to 10.
(2) 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.
3) If not within tolerances, adjust VR-6 (Q), VR-7
(gain), and VR-8 (/ 0 ) as necessary.
4) After finishing, set bowing to off, level to 10,
and tone to 10.
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Korg Trident MK1 Specifications

General

Brand	Korg
Model	Trident MK1
Category	Electronic Keyboard
Language	English