Maintenance and Troubleshooting
Scanner Diagnostics
8-3
Scanner Diagnostics
There’s an onboard diagnostic program that enables you to check your battery and confirm front
panel button functions.
To enter the Scanner Diagnostics, simply press 4, 5, and 6 (on the alphanumeric buttonpad)
simultaneously while in Program mode. The K2661 responds by lighting each LED in sequence
and then displaying something like the following.
K2661|SCANNER|DIAGNOSTICS|VERSION|5.00||
(PRESS|"EXIT"|AND|"ENTER"|TO|EXIT)||||||
BATTERY=3.2VOLTS,|WHEEL|CENTER=128||||||
||||||||||||||||||||||||||||||||||||||||
XXXXXX||||||||||||||||||||||||||||||||||
||||||||||||||||||||||||||||||||||||||||
||||||||||||||||||||||||||||||||||||||||
The battery voltage and wheel center values may be different on your unit. The line represented
by XXXX gives a readout identifying the buttons you press.
The diagnostic program can also be used to check out the front panel components. If you move
the Alpha Wheel clockwise, the numbers will go 0-1-2-3-0-1-2...while counterclockwise should
produce 3-2-1-0-3-2-1... If you press a button, its name will be shown and if it is one of the mode
buttons, its associated LED should flash.
The third line of the display shows the results of two measurements that are made whenever
your K2661 is turned on. The battery voltage will be about 4.3 volts for new batteries, gradually
declining over time to 3.2 volts, at which point you will begin to receive warnings (see Battery
Replacement on page 8-2).
Maximizing Music and Minimizing Noise
Your K2661 quite possibly has the lowest noise and widest dynamic range of any instrument in
your studio. The following tips will enable you to make the most of this, and optimize the
K2661’s audio interface to your other equipment.
Setting your audio levels appropriately is the key to optimizing the signal-to-noise ratio of any
piece of equipment. It’s best to increase the output level digitally (by editing programs) instead
of increasing the gain of your amplifier or mixing board. This is because a digital gain increase is
completely noiseless, whereas an analog increase will proportionally increase hum and noise
from the connecting cabling and from the K2661 itself.
Increasing the volume digitally can be accomplished in three different ways. You can increase
the volume of all programs assigned to a given MIDI channel by selecting the CHANNELS page
in MIDI mode and setting the OutGain parameter to the desired level (in 6dB steps). For songs
that use multiple MIDI channels, you’ll need to do this for each channel. Alternatively you can
increase the volume of a single program by going to the OUTPUT page in the Program Editor
and setting the Gain parameter to the desired level, again in 6dB steps. For finer adjustment,
there’s the Adjust parameter on the F4 AMP page.
Increasing the level too much can cause clipping distortion when multiple notes are triggered
with high attack velocity. For dense songs played through the same outputs, you will probably
be able to increase the volume by only 6 dB or so without risk of distortion. For monophonic
instruments (lead guitar) or single instrument tracks (such as drums), a substantially greater
boost is generally possible.
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