Kurzweil K2000 - LCD Scanner Diagnostic Details (v0.4)

SECTION 4
In addition to the two selectable diagnostic routines just described, the
scanner performs a number of automatic tests at power-up. If these tests are
completed successfully, all 8 of the panel LEDs will flash ONCE about 1 second
after power-up. If the Pitch Wheel is too far off center for full range
operation, the LEDs will flash TWICE. If the battery voltage is too low for
reliable memory retention, the LEDs will flash THREE times. Four flashes
indicate both a low battery and an off-center Pitch Wheel.
4.16.1 Using the LCD Scanner Diagnostic
The LCD scanner diagnostic may be started when the K2000 is displaying its
Program Page. Press the 4, 5, and 6 buttons simultaneously. The scanner
will respond by lighting each LED in sequence and then displaying the
following on the LCD:
Figure 4. 10.
Scanner Diagnostics
It is possible the battery voltage and wheel center values will differ from
unit to unit. Fresh batteries should read in the range of 4.3 - 4.8 volts.
If the battery reading is less than 3.5 volts, it is nearing the end of its
life (warnings will start to appear when it declines to 3.2 volts). The
wheel center should be between 120 and 136 (inclusive) for full range
operation.
The fourth line (represented by XXXX) is generally the one of interest. If
it is flickering, move the right wheel toward the center. If it shows PEDAL
1 or PEDAL 2, unplug the switch pedals. Now when any button or control
connected to the scanner changes, the name of that component and its most
recent control value will be displayed on the fourth line. Below is a
description of how the display should react to every scanned component.
A. When the Pitch Wheel is pushed back, the display should show "PITCH WHEEL"
and the numbers should smoothly increase toward 254 or 255. The numbers
will move in increments of 2 or more depending on how fast the wheel is
moved. If the wheel is pulled forward, the numbers should decrease toward
1 or 0, again in steps of 2 or more. When the wheel is released, the
number should return to a value between 120 and 136. If the centering or
range is off, there are two adjustment potentiometers on the wheel assembly
that can be moved to correct the problem. If the display flickers or
changes to BATTERY or CONTROL PEDAL when the Pitch Wheel is pulled full
forward or pushed full back, these pots should be adjusted. A perfectly
adjusted Pitch Wheel reads within 1 count of 128 in the center position,
reaches 254/255 just as it hits the back stop, and reaches 0/1 just as it
hits the front stop.
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