Troubleshooting - Yamaha MU128 Owner's Manual

Troubleshooting

Troubleshooting
Even though the MU128 is exceptionally easy to use, it may occasionally
not function as you expect it to. If that happens, check the possible problems
and solutions below before assuming that the instrument is faulty.
Problem
No power.
No sound.
No sound when playing the
MU128 from a computer,
sequencer or external
keyboard.
Notes are cut off or omitted.
Reverb, Chorus and/or
Variation effects cannot be
heard.
The A/D input sound (mic,
guitar, etc.) cannot be heard.
184
Possible Cause and Solution
Check that the adaptor is properly plugged into both the MU128 and the
AC outlet (page 27.)
Check that:
The panel volume control is set to an appropriate level.
Other volume-related parameters are set to appropriate levels. (See Vol-
ume and Expression in the Single Part controls, page 107, and Master
Volume and Master Attenuator in the All Part controls, page 109.)
Mute or Solo are not active. (See page 95.) If a Part is being muted, or an
empty Part is being soloed, you may not get any sound.
The Variation effect settings are appropriate. No sound will be output at
all if Variation Connection is set to INS (page 150), Variation Send is
turned on for the Part (page 108), and NO EFFECT is selected for the
Variation Type (page 149). The easiest solution in such a case is to turn
off Variation Send for the Part.
The EG Attack Time (page 114) is appropriately short, for short percus-
sive sounds.
The Velocity Sensitivity Offset (page 123) is appropriate.
The Note Limit Low and Note Limit High (page 122) settings are ap-
propriate. If the former is set higher than the latter, no sound will be
output.
The Velocity Limit Low and Velocity Limit High (page 123) settings are
appropriate. If the former is set too high and the latter too low, no sound
may be output.
Check all MIDI connections, making sure that the MIDI OUT of the exter-
nal device is connected to the MIDI IN of the MU128, and that the MIDI
IN of the external device is connected to the MIDI OUT of the MU128.
(page 32.) Or, if you are using the TO HOST terminal with a computer,
make sure that the terminal is properly connected to the computer and that
the HOST SELECT switch is properly set for your particular computer.
(pages 35, 36.) Also, make sure that you have turned on the connected
MIDI instrument or computer before turning on the MU128. If you haven't,
simply turning the MU128 off and back on again may solve the problem.
The maximum polyphony of the MU128 may be exceeded. The MU128 can
play no more than 128 notes at once. (Though 128 notes may seem to be
more than enough, you may run short when playing a connected keyboard
along with some densely arranged song data.)
Check all Reverb-, Chorus- and Variation-related controls: Reverb Send,
Chorus Send and Variation Send in Single Part controls (pages 107, 108);
Reverb Return, Chorus Return and Variation Return (when Variation Con-
nection is set to SYS) in All Part controls (pages 109, 110). Also check the
individual effect settings; if no Type has been selected, or if the parameter
settings are too low, there may be no effect sound.
Make sure that the appropriate A/D Part (A/D1 or A/D2) has been turned
on and that the A/D INPUT control is set to an appropriate level. Also for
best results, make sure that the A/D input type (Mic, Guitar, Keyboard,
Audio) is set to match the input you are using (pages 98-100).
MU 128 Appendix