Alesis DEQ224 Service Manual page 19

Rear Panel Sub Assembly Test CON'T
1) Plug the P3 type Alesis Power Supply into a power source and the
barrel jack into the DUT Power In jack.
Verify that the front panel LEDs show the normal power up
message, "DEQ224".
Verify that the LEDs do not flicker and are of a consistent
brightness.
Problems with this inspection indicate that the rear panel is
not supplying the correct voltage to the Front Panel.
check that the 10 pin DIL cable has been installed correctly.
If this is not the problem, then the DUT has FAILED.
Failure of this test indicates that this sub-assembly cannot
continue further testing.
Panel.
that the Front Panel may have been damaged (burning smell,
etc.), follow QC procedures to check the Front Panel, because
the faulty DUT power supply may have damaged the Known Good
Front Panel.
2) Unplug the power supply and continue with Audio Fidelity Test if DUT
has not failed.
If any are hot, or if there is any other indication
Quickly check the ICs on the Front
Double