Kurzweil K2000 Service Manual page 90

SECTION 4
• PROGRAM ($80)
• SETUP ($40)
• QUICK ACCESS ($20)
• EFFECTS ($10)
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Figure 4.21 - LED values
• MIDI ($08)
• MASTER ($04)
• SONG ($02)
• DISK ($01)
The value is calculated by summing the values represented by the lit LEOs.
Another way to look at this is to consider the LEOs as representing a string
of binary digits (bits). A lit LED represents a one(l), and an unlit LED
represents a zero (0).
For example, the hexadecimal value $A7 (167 decimal) would be represented as
follows:
Program mode
Setup mode
Quick Access mode
Effects mode
On
Off
On
Off
MIDI mode
Master mode
Song mode
Disk mode
Off
On
On
On
The values of the lit LEOs are $80 (128 decimal), $20 (32), $04 (4), $02 (2),
and $01 (1), for a total of $A7 (167). Interpreted as a binary string, the
value would be 10100111.
Movement of either wheel, the Controller slider, or a control pedal causes the
changed value to appear in hex on the LEOs. Although there is no direct
indication of which control changed, you can assume that the control that
changed physically is the one the scanner observed.
If Switch Pedal 1 is closed, the LEOs will show $F1; if Switch Pedal 2 is
closed, they will show $F8.
As
with the LCD-based diagnostics, normally
closed switch pedals should be unplugged except when they are being
specifically tested.
Turning the large knob clockwise gives the sequence $01-$02-$04-$08-$01-
$02.... while turning it counter-clockwise should give $08-$04-$02-$01-$08-
$04 .....
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