Front Panel Sub Assembly Test; Items Required; Assembly; Power Test - Alesis DEQ224 Service Manual

3) Front Panel Sub Assembly Test

Items Required

1 ME1 Front Panel Sub-Assembly (DUT)
1 Known Good ME1 Rear Panel Sub-Assembly (Rear Panel)
1 P3 type Alesis Power Supply
1 10 pin DIL cable for Rear Panel to Front Panel connection.

Assembly

1) Connect 10 pin DIL cable from the Front Panel J6 to the DUT J1.
sure that the Pin 1 stripe on the cable is oriented correctly on both
sub-assemblies.
2) Sub Assembly is ready for testing.

Power Test

1) Plug the P3 type Alesis Power Supply into a power source and the
barrel jack into the Rear Panel Power In jack.
Verify that the front panel LEDs show 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 DUT is drawing
too much power from the Rear Panel.
pin DIL cable has been installed correctly.
problem, then the DUT has FAILED.
Failure of this test indicates that this sub-assembly cannot
continue further testing.
Panel.
that the Rear Panel may have been damaged (burning smell,
etc.), follow QC procedures to check the Rear Panel, because
the faulty DUT may have damaged the Known Good Rear Panel.
2) Unplug the power supply. Continue with Functionality Test if DUT has
not failed.
If any are hot, or if there is any other indication
Continue with Power Test.
Double check that the 10
Quickly check the ICs on the Rear
Be
If this is not the