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Maintenance and Troubleshooting
User-callable Diagnostics
batteries in the proper direction (the positive terminals should be pointing out). Incorrect
insertion won't damage anything but the memory won't receive any power from the batteries.
Most quality brand-name batteries now have "sell by" dates printed on their package. Carbon-
zinc batteries will last for at least a year after installation while alkaline batteries should last for
at least 2 years provided they are installed before the date on the package. Rechargeable
batteries should not be used; the K2500 will not recharge them and their life after charging on
an external charger will be only a few months. Battery life is not significantly increased by
leaving your K2500 on all the time; batteries may even suffer heat degradation if the K2500 is
left on continuously.
User-callable Diagnostics
There's an onboard diagnostic program that will enable you to check your battery and confirm
front panel button functions.
To enter the diagnostic program, simply press the 4, 5, and 6 buttons all at once when in
Program Mode. The K2500 will respond by lighting each LED in sequence and then displaying
text such as the following on the LCD:
K2500|SCANNER|DIAGNOSTICS|VERSION|2.1|||
||||||||||||||||||||||||||||||||||||||||
(PRESS"EXIT"|AND|"ENTER"|TO|EXIT)|||||||
||||||||||||||||||||||||||||||||||||||||
BATTERY=4.3VOLTS,|WHEEL|CENTER=128||||||
||||||||||||||||||||||||||||||||||||||||
XXXXXXXXXXXXXXXXXX||||||||||||||||||||||
||||||||||||||||||||||||||||||||||||||||
The battery voltage and wheel center values may be different on your unit. You can ignore the
Wheel Center reading; it doesn't apply to the K2500. The fourth 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 K2500 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
Selection and Replacement" above). The line referring to the Wheel is only relevant to the
keyboard models of the K2500.
Maximizing Music and Minimizing Noise
Your K2500 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
K2500'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. You may have noticed that the K2500's output signal seems less "hot" than
most other synths when using the unedited factory sounds. This is to allow virtually any
configuration of voice assignment to be used (up to 96 oscillators directed to one output!), and
played very loudly with almost no chance of overload distortion. For more controlled
9-2
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Troubleshooting
