Kurzweil K2000 - Diagnostics and Noise Reduction; User Callable Diagnostics Overview; Maximizing Music and Minimizing Noise

MAINTAIN. PUB 11/04/92
SECTION 4
4.4.3
4.4.4
4.4.5
4.4.6
4.4.7
4.4.8
4.4.9
The battery voltage and wheel center values may be different on
your unit. The fourth line (represented by XXXX) is the one of
interest in diagnosing pedal problems (if it is flickering, move
the right wheel toward the center of its rotation; if it is
blank, all is OK).
To see how the display works, first plug the footswitch that
carne with your K2000 into the FOOTSWITCH 1 jack on the rear
panel. When the footswitch pressed, the fourth line should
read:
PEDAL 1
When the footswitch is released, the fourth line should become
blank. When plugged into the FOOTSWITCH 2 jack, the action
should be similar except that "PEDAL 2" will be displayed.
Now try your third-party footswitch. If it acts the same way as
the Kurzweil unit, then all is well from a hardware standpoint.
IF the fourth line remains blank when the footswitch is pressed,
there is a problem with the footswitch; either its internal
switch, the connecting cable, or the plug. Likewise if "PEDAL
X"
always shows whether the footswitch is pressed or not, there
is a short circuit somewhere along the line. Some footswitches
will act backward, that is, the display will show "PEDAL X"
immediately when the footswitch is plugged in and will go blank
when the footswitch is pressed. This type of footswitch can be
used with the K2000, but it must be plugged in be£ore the power
is turned on. Alternatively, performing a "soft-reset" (press
"+ -", "0", "CLR" together) after plugging in a backward
footswitch will result in proper operation.
The diagnostic program may be used to examine the action of a
control pedal as well. To get an idea of how this works, move
the CONTROLLER slider on the K2000 panel up and down and look at
the fourth line. It should say "DATA SLIDER = XXX" where XXX
varies from 0 or 1 (slider down) to 254 or 255 (slider up) .
Move
the slider very slowly; the numbers will tend to increase
or decrease by twos. This is part of the "anti-flicker" routine
used by the diagnostics, and is normal.
Now try the control pedal. When connected, the fourth line will
change to show "CONTROL PEDAL - XXX". Rocking the pedal forward
should make the numbers increase toward 255 while retiring it
should make them decrease. Moving the pedal to approximately
mid-position should yield a reading of around 130 (100 - 160 is
typical). Common control pedal problems are backward action
(rocking forward makes the numbers decrease), restricted range
(the numbers will not reach 254 or 255 in the forward position
or 0 or 1 in the back position), and non-linearity (rocking
halfway forward gives a reading substantially less than 100.
For any of these problems, first check the connection pattern
between the potentiometer in the pedal and the stereo plug. The
wiper must be connected to the tip, the lower end of the
potentiometer (the end the wiper moves toward when the pedal is
retired) connected to the sleeve, and the upper end to the ring.
If a volume pedal is being used and it will not go to zero,
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