DVOR 432
Operation and Maintenance
Fault Location
6-1
Ed. 01.04
CHAPTER 6
FAULT LOCATION AND REPAIR
6.1
FAULT LOCATION
6.1.1
General
Fault location in the DVOR Systemcan be executed with the PC and ADRACS (see Section 6.1.2)
or with the fault location support procedure in Section 6.1.3. You should print out all settings, BITE
values and monitor values of the transmitter, the monitor and LCP on the finally set system that has
reached operating temperature. This data consists of the reference values, a knowledge of which will
substantially facilitate troubleshooting. These values are assumed for the following troubleshooting
procedure. If HF modules are replaced, the printout should be updated because HF modules have
greater tolerances. This log of the ACTUAL state is a basis for the troubleshooting procedure.
NOTE:
Both SB1, SB2 and SBA, SBB are used as termfor sideband signals in CVOR/DVOR sysĆ
tems. SBA, SBB are used normally for CVOR (signals to dipole A or B), the terms SB1,
SB2 are generally used in other Navaids 400 systems.
6.1.2
Fault Evaluation with PC and ADRACS
Any fault is stored in the system memory, which occurs in the installation and is acknowledged by
the internal BIT and which leads to a WARNING or ALARM indication. Fault location in Navaids 400
can be performed by use of the BIT report in the ADRACS program. This report is available in the conĆ
figuration menu of the ADRACS program:
- Move mouse cursor to field TRANSMITTER or MONITOR or LCP, a cursor
more
appears.
- Click twice for more information about transmitter or monitor or LCP. The ensuing BIT results are
displayed and can be interpreted or printed out.
6.1.3
Fault Location Support DVOR (50 W and 100 W)
In addition to the BIT fault report ( see 6.1.2), the following fault location tables list typical faults, which
may occur in a DVOR installation. The tables contain 5 columns: Step, Fault, A to C. To execute fault
location in the following tables, start with left column and proceed to the right following A, B or C, and
then fromnext row in A to C, if necessary.
6.1.3.1
Power Supply and Module Indicators
The BIT fault report (see 6.1.2) indicates faulty operating voltages, so that the defective module
(AC/DC converter or DC/DC converter) can be defined and replaced. Before replacing the AC/DC
converters, check mains power supply. Before locating a fault, try to define roughly the defective funcĆ
tional group, i.e. power supply, transmitter, antenna, monitor or LCP. A first localization is done by evalĆ
uating the LED indicators on the various modules (see Figs. 3-15, 3-16):
Step
Fault
A
B
C
1
ACC
LED out?
ACC switched to ON?
Check power supply to
ACC or change ACC
2
DCC
LED out?
ACC switched to ON?
TX1/TX2 at PMM switched on?
Check power supply to
DCC or change DCC
3
LCP
Live-lamp out?
DC operating voltage ok?
Reset LCP
4
MSP-VD
Live-lamp out?
DC operating voltage ok?
Resetprocessor
5
MSG-C
Live-lamp out?
DC operating voltage ok?
Resetprocessor
6
CSL
MON1 LED lit?
MON2 LED lit?
TX1 ON LED out?
TX2 ON LED out?
Monitor 1 faulty
Monitor 2 faulty
TX1 power supply on?
TX2 power supply on?
Check according to followĆ
ing tables 6.1.3.2 ff.
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