AS 680/682
Maintenance and Repair Description, Operation and Maintenance
ADS−B
7−2 Ed. 10.07
The protective ground wire offered with mains cable or plug connections is not suitable for potential
equalization of equipment on a worktable. Depending on local circumstances, it can carry quite high
RF interference voltages.
Mains−supplied equipment, power supplies and test equipment should be connected via two−wire
cables and two−pin plugs. For measures to be taken with respect to components sensitive to elec-
trostatic charging (MOS, Low Power Schottky) please refer to the customer service documentation
of the manufacturer. If an employee is required to handle subassemblies for transport purposes, he
should place both hands flat on a grounded surface beforehand (e.g. on the ground bus of the work
table). The module can be picked up by its insulator immediately following this potential equalization.
It is safer to avoid touching the terminals. Only remove short−circuit links where absolutely neces-
sary. Place printed circuit boards only on tables with a conductive, grounded working surface. Leave
individual subassemblies in the antistatic plastic bags for as long as possible.
7.1.4 Damage Check/Visual Inspection
The following outdoor and indoor system parts have to be checked visually for entirety.
Outdoor:
− State of ADS−B RX and GPS antennas, LNA−housing, cables
− Tight fitting of all RF cable and earthing connections (external).
Indoor:
− State of SPU and Site Monitor, cables
− Openings of the SPU for dust, dirt or other obstacle of air flow and remove it.
− Tight fitting of all RF/AF cable and earthing connections (internal).
7.1.5 Cleaning
Required Tools: Brush, soft tissue or vacuum cleaner depends on level of dirt.
CAUTION
Cleaning aids, such as brushes and dusters, must be made of antistatic material. See also
the instructions in Section 7.1.3.
The air dust filter of the SPU and ventilation openings (front air inlet and right side air outlet) should
be checked from time to time in accordance with the volume of dirt that accumulates at the particular
location.
7.1.5.1 Cleaning the Dust Filter Mat of the Air Inlet
See Fig. 7−4.
Required Tools: Philips Screw Driver #2, vacuum cleaner (depends on level of dirt)
− Open the air inlet cover with the four captive screws and remove it.
− Withdraw the dust filter mat frame right hand inside.
− Carefully beat it clean or use a vacuum cleaner, or if need be insert a new dust filter mat frame
(Ref. No. 58142 30410).
− Slide the dust filter mat frame into the slide close to the stop.
− Clean the air inlet cover.
− Mount the air inlet cover and fasten the four captive screws.
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