AS 682
Description, Operation and Maintenance Maintenance and Repair
ADS−B
7−11Ed. 10.07
7.3 REPAIR
WARNING
Before replacing a subsystem connected to mains, shut down mains supply. The supply
voltage (AC or DC) must always be disconnected before removing or installing subsys-
tems, fuses or cables.
CAUTION
Take care when removing or inserting cables to the MicroSubD connectors. Fixing screws
of the SubD cable connectors have to be tightened to the SubD connector bolts with max.
40 Ncm. Use a torque wrench.
7.3.1 Replacing Subsystems and individual Subassemblies (LRU)
Tools required: Oscilloscope, Digital Voltmeter, measurement cables and Maintenance Adapter for
RXU adjustment; screw driver set.
The relevant subsystems must be de−energized before removing or installing:
a) Switch off DC of the respective subsystem: Signal Processing Unit or Site Monitor. If AC is option-
ally used: Switch off the mains switch. Remove the DC or mains or DC supply cable.
The SM, UPS and Data Switch are replaced completely. The following steps are a general procedure
for all LRU’s. Special procedures are described in 7.3.3.
a) First remove the concerned cables carefully from the subsystem or subassembly to be changed.
b) All subassemblies of the SPU can be removed easily: Unfasten the captive screws holding the sub-
assembly. Press corrugated locker button in the extraction handle (RXU, SBC, SPB both sides)
and move the extraction handles simultaneously to withdraw the respective board as shown in Fig.
7−4. Exception DC/DC converter: additionally loosen the screws fixing the front panel to the 19"
rack. The GTS DG14 (or B12) and the AC/DC (or DC/DC) converter own only one extraction han-
dle. Pull the subassembly carefully out from the subrack.
c) To insert a subassembly gently push it into its position in the subrack and lock to the subrack with
the extraction handles. Finally fasten captive screws again.
Fault
Power
THALES Mode S Ground Station SPU
SPBRXU
GTS
DG14
I
0
corrugated locker button
extraction handle
subassembly
SPU housing front
withdraw withdraw
captive screws (example)
Power Supply Fan UnitAir Inlet
Dust Filter
Fig. 7−4 Removing subassemblies of SPU
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