DO NOT replace defective disk unit with a spare unit until the cause of the smoke and
fire has been determined and all power cabling has been checked out as operational and
b. Noisy HDA Operation. Whenever noise is detected during the operation of the HDA, immediately turn off
the power to the disk unit. Exchange the HDA with an operational HDA (para 2-7). Apply power to the disk unit.
If noise Is no longer noted, the problem was the HDA itself. Forward the defective HDA to Depot Maintenance for
If the noise persists, immediately turn off the power to the disk unit. Remove the HDA (para 2-8), replace the defective
disk unit with an operative spare, and forward the defective unit to the next higher level of maintenance for repair.
c. Noisy Blower Fan. Should the blower fan become noisy, the disk unit is removed and replaced with an
d. PWR ON/PWR OFF Switch Keeps Tripping to PWR OFF. This equipment malfunction is beyond the
scope of this manual. Replace the defective disk unit with an Operational spare unit (para 4-14).
e. All LEDs Won't Light. This equipment malfunction is beyond the scope of this manual. Replace the
OVER TEMP Indicator Lit. Whenever the OVER TEMP indicator lights, overheating within the disk unit is
An overheated condition within the disk unit WILL NOT shut the unit down; it will
continue to operate until the operator removes power to the unit.
Following are recommended actions to be taken by the maintenance personnel whenever an overheating condition is
Do not operate unit when ambient temperature exceeds 1100F, if possible.
Verify that the unit's blower fan is operating properly.
The unit's air filters (on front of unit) are not clogged with dirt, oil, or debris.
The air flow in front of and behind the unit is not impaired in any way.