Front Panel Sub Assembly Test; Items Required; Assembly; Power Test - Alesis DEQ830 Service Manual

4) Front Panel Sub Assembly Test

Items Required

1 ME4 Front Panel Sub-Assembly (DUT)
1 Known Good ME4 Rear Panel Sub-Assembly (Rear Panel)
1 Known Good BB01 Power Supply with internal 4-pin power cable
1 24 pin DIL cable for Rear Panel to Front Panel connection.
1 Known Good BB01 Power Supply with internal 4-pin power cable
1 IEC power cable
1 5-pin DIN Male to Male standard MIDI cable

Assembly

1) Connect 24 pin DIL cable from the DUT J6 to the Known Good Rear Panel
J12. Be sure that the Pin 1 stripe on the cable is oriented
correctly on both sub-assemblies.
2) Connect the 4 pin clip-lock power cable from the BB01 Power Supply to
the Known Good Rear Panel J13.
3) Connect the 5-pin DIN Male to Male MIDI Cable from the MIDI IN jack
to the MIDI OUT jack.
4) Sub Assembly is ready for testing.

Power Test

1) Plug the IEC Power Cable into a power source and BB01.
Verify that the front panel LEDs show normal power up message,
"DEQ830" on the left side.
Verify that the LEDs do not flicker and are of a consistent
brightness.
Problems with this inspection could indicate that the rear
panel is not supplying the correct voltage to the DUT, OR that
the DUT has faulty ICs or other problem.
24 pin DIL cable has been installed correctly.
the problem, then the DUT has FAILED.
Failure of this test indicates that this sub-assembly cannot
continue further testing.
the Known Good Rear Panel.
other indication that either assembly 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 IEC Power Cable to the BB01 Power Supply.
Digital In Test if DUT has not failed.
Continue with Power Test.
Double check that the
Quickly check the ICs on the DUT and
If any are hot, or if there is any
If this is not
Continue with