Power Test - Alesis DEQ830 Service Manual

Re ar Panel Sub Assembly Test – DIGITAL CON'T

Power Test

1) Before applying power, visually inspect the DUT for major assembly
problems.
Verify that U9 has a metal heat-sink that has been properly
screwed tightly to the metal tab with heat conducting gel.
Verify that U7, U5 has been installed correctly and that the
metal tab has been screwed to the HEAT SINK plane and is making
a good connection to the plane.
Verify all Electrolytic capacitors for correct orientation.
C35, C55, C56, C40, C41, C165
C5, C13, C10, C65, C66, C64, C101, C102, C100, C86, C85, C87
C52, C50, C47, C49, C54, C53, C57, C152, C157, C156, C154,
C155, C159, C160, C161
Problems with this inspection indicate that the DUT has FAILED.
Failure of this inspection indicate that the DUT cannot
continue further testing.
2) 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 indicates that the rear panel is
not supplying the correct voltage to the Front Panel.
check that the 24 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.
3) Unplug the IEC Power Cable to the BB01 Power Supply.
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
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