Alesis DEQ224 Service Manual page 23

Front Panel Sub Assembly Test 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.
Verify that each row lights in order without skipping any rows.
Verify that all the LEDs in a common row light at the same
time, and that two rows are NEVER on at the same time.
that when LEDs in a row are lit, that all the LEDs in that row
turn on.
Problems with no response to Band Button 2 indicate Band Button
2 is faulty and the test has FAILED.
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 is faulty 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.
This button is located on the far left hand
Problems with no response to Band Button 3
This button runs the
Problems with LED
The DUT cannot continue
Verify