Alesis Andromeda A6 Service Manual page 9

If a pot reaches the nominal min and max values, the word "PASSED" will be displayed on the
screen. The passing minimum value is 11 or less. The passing max value is 4084 or greater. It
is normal if a pot doesn't go all the way to zero, or all the way up to 4095, due to offsets in the
ADC op amps.
Test
Pitch Wheel
Mod Wheel
Aftertouch
Control Foot Pedal
Ribbon Right/Left
Pots
Note that a bad pot may still give a passing message (for example if it jittering), so the user must
use some common sense here. If a pot is constantly jittering, there is a problem with the pot (or
the unit).
Note that the Pitch Wheel, the Mod Wheel, the Continuous Controller Pedal, Aftertouch, and
Ribbon Controller all fall under the pot test. These controllers all have different nominal min
and max values. To speed up the test during production, a regular pedal switch may be plugged
into the CC Pedal jack and used for this test.
For the pitch and mod wheels, make sure the wheels are not electrically swapped. The pitch
wheel is on the left, the mod on the right. The pitch wheel should have a spring and should
bounce back to center.
When doing this test, turn only one pot at a time. If more than one pot is turned at a time, the
test will fail (in boot code V1.20.10 or later), because the software thinks another pot is jittering.
Also, turning more than one at a time may cause the display queue to overflow.
2.25 LED Test
To enter this test, press soft button 1. All of the LEDs on the unit should light up. The yellow
LEDs should be blinking. Hit button 1 again to turn off the LEDs. Note that any LEDs that
were on before this test will be restored and kept on.
The user should make sure that all LEDs go on, that all LEDs are centered in the window, and
all LEDs are the correct color.
2.26 MIDI Test
To perform this test, press soft button 2. A MIDI cable should be connected from MIDI OUT to
MIDI IN. This test will send a series of bytes through the MIDI port and read them back in. If it
passes, the display will read "MIDI TEST PASSED".
2.27 LCD Test
Confidential
Passing min threshold Passing max threshold
center value + 1300
1000
400
100
30
12
Alesis Service Manual
center value - 1300
3000
4083
2500
3000
4083
8-31-0089-C