Troubleshooting; Power Supply; Display; Audio Output - Korg M50-73 Owner's Manual

Appendices

Troubleshooting

If you experience problems, please see the relevant
item and take the appropriate measures.

Power supply

Power does not turn on
Is the AC adapter connected to an outlet? → p.1
Is the rear panel POWER switch turned on? → p.23

Display

The power is turned on, but nothing is shown
on the display. The M50 functions normally
when you play the keyboard or perform oth-
er operations.
Use the rear panel Contrast adjustment knob to adjust
the contrast of the display. → p.10
The power is turned on, but the display does
not work normally, or an error message is dis-
played. There is no sound when you play the
keyboard, and the M50 does not function
normally.
This type of problem may occur if a data writing
operation to internal memory was not completed
correctly, for example, if the power of the M50 was
turned off while a program or other data was being
written. If this occurs, use the following procedure to
initialize the M50's internal memory.
1. Turn off the power.
2. While holding down the RESET CONTROLS
switch and the REALTIME CONTROL switch
located beside it, turn on the power of the M50.
The M50 will be initialized, and data will be written
into internal memory. While the data is being writ-
ten, the display will indicate "Now writing into
internal memory."
After initialization, all user data will be empty, and
you will need to re-load the preload data. Execute
the Global mode menu command Load Preload/
Demo Data to load the data. → p.97
Operations in the display don't work, the po-
sition has drifted, the response is poor
On the Global P0: Basic Setup page, use the Touch
Panel Calibration menu command to adjust the touch
panel response. → PG p.252
You can perform the calibration more accurately by
using a touch pen or similar object to touch the center
of the square, top/bottom/left/right, or the desired
direction. Normally you should use the center of the
square to perform the calibration.
Note: If you are unable to select commands from the
menu, do the following:
1. Press the GLOBAL switch.
98
2. Press the EXIT switch twice.
3. Hold down the ENTER switch and press 3 on the
numeric keypad.
The Touch Panel Calibration page will appear. Follow
the on-screen instructions to re-calibrate the touch
panel.
Can't switch modes or pages
If you're doing any of the following, you may not be
able to change modes or switch to a different page:
• Recording or playing back a song or pattern
In Combination, or Sequencer modes, you
can't edit the value of Timbre/Track parame-
ters such as MIDI Channel or Status
Some parameters can't be edited while notes are
playing, either locally or from MIDI. If the damper
pedal is held down, or if its calibration is incorrect,
notes may be sustaining even if they aren't audible.
• Are you using a damper pedal with a polarity that
does not match the Damper Polarity setting (Global
P2: Controllers– Foot Controllers)? → PG p.228
• In some cases, this problem can be solved be
executing the menu command Half Damper
Calibration (Global P0: Basic Setup). → PG p.252
No beep sounds when you touch the display
Check the Beep Enable check box (Global P0: Basic
Setup– System Preference). → PG p.218

Audio output

No sound
Are connections made correctly to your amp, mixer, or
headphones? → p.24
Is the connected amp or mixer powered-on, and is its
volume raised?
Is Local Control turned on?
• In Global P1: MIDI, check the Local Control On
check box. → PG p.220
Is the VOLUME slider raised? → p.10
Is the Master Volume assigned to Foot Pedal Assign,
and is that pedal volume lowered? → p.84
If a specific timbre doesn't sound in Combination
mode, is its Play/Mute button set to Play?
Alternatively, are all Solo button settings turned off?
→ PG p.82
If a specific track doesn't sound in Sequencer mode, is
its Play/Rec/Mute button set to Play? Alternatively,
are all Solo button settings turned off? → PG p.131
Make sure that the Status is INT or BTH. → p.49, p.55
Are the Key Zone and Velocity Zone set so that sound
will be produced when you play? → PG p.17, p.99,
p.156
Is the Oscillator, Drum Track, Timbre, or Track level
lowered in the control surface mixer? → PG p.4, p.83,
p.133