Alesis DEQ224 Service Manual page 30

Final Assembly QC CON'T
5) Press Band Button 2. This button is located on the far left hand side
of the unit, underneath the column marked "34".
LED ROW TEST.
Verify that rows begin to light in order and that the LED
pattern is in working order as in the Front Panel Sub Assembly
Test.
Verify that the lens is free of scratches, and that the LEDs
have a consistent and clear appearance.
Problems with no response to Band Button 2 indicate Band Button
2 has mechanical fit problem and the test has FAILED.
with LED inspection indicate test has FAILED.
Failure of this inspection indicates that the DUT cannot
continue further testing.
6) Press Band Button 3.
side of the unit, underneath the column marked "45". This button runs
the software revision check.
Verify that the seven-segment display changes.
Verify that the seven-segment display shows the current
software revision number.
Problems with incorrect software revision number indicate that
the incorrect software is being loaded into the DUT, and the
test has FAILED.
indicate Band Button 3 has mechanical fit problem and the test
has FAILED.
Failure of this inspection indicates a serious problem with
current firmware for production.
further testing, and the Alesis Engineers listed at the top of
this document should be asked for current software or current
version of this document before continuing production.
7) In order, press Band Button 4 through Band Button 24.
Verify that when the button is held, that the column above the
button lights, that the number corresponding to the button is
shown in the seven-segment display, and that the LED pattern is
in working order as in the Front Panel Sub Assembly Test.
Verify that the lens is free of scratches, and that the LEDs
have a consistent and clear appearance.
Problems with no response or flickering LEDs indicates poor or
failed mechanical fit for the switch, and the test has FAILED.
If there seems to be a problem with the numbers displayed in
the seven-segment display, then the display has also FAILED.
Failure of this inspection indicates that the DUT cannot
continue further testing.
Final Assembly QC CON'T
This button is located on the far left hand
Problems with no response to Band Button 3
This button runs the
The DUT cannot continue
Problems