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Operation and Maintenance
6.1
FAULT LOCATION
6.1.1
General
Fault location in the DVOR System can 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 term for sideband signals in CVOR/DVOR sys
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 con
figuration menu of the ADRACS program:
- Move mouse cursor to field TRANSMITTER or MONITOR or LCP , a cursor
- 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 from next 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 func
tional group, i.e. power supply, transmitter, antenna, monitor or LCP . A first localization is done by eval
uating the LED indicators on the various modules (see Figs. 3-15, 3-16):
Step
Fault
A
1
ACC
LED out?
2
DCC
LED out?
3
LCP
Live-lamp out?
4
MSP-VD
Live-lamp out?
5
MSG-C
Live-lamp out?
6
CSL
MON1 LED lit?
MON2 LED lit?
TX1 ON LED out?
TX2 ON LED out?
Ed. 01.04
CHAPTER 6
FAULT LOCATION AND REPAIR
B
ACC switched to ON?
ACC switched to ON?
TX1/TX2 at PMM switched on?
DC operating voltage ok?
DC operating voltage ok?
DC operating voltage ok?
Monitor 1 faulty
Monitor 2 faulty
TX1 power supply on?
TX2 power supply on?
DVOR 432
Fault Location
appears.
more
C
Check power supply to
ACC or change ACC
Check power supply to
DCC or change DCC
Reset LCP
Resetprocessor
Resetprocessor
Check according to follow
ing tables 6.1.3.2 ff.
6-1
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