Thales DVOR 432, Technical Manual

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DVOR 432
Fault Location Operation and Maintenance
6-2
Ed. 01.04
6.1.3.2 Localization of the defective Equipment Part (1)
Step Fault A B C
1.1 Bothmonitors
show the same
fault.
Feed the transmitting antenna
fromthe other transmitter.
Are both monitors fed from
the same dipole via one line?
If the fault disappears, search
for it in the transmitter
Is the transmitter correctly set? If yes, check the dipole
and the line
1.2 The affiliation to
thetransmitter
or monitor is
stillunclear.
The transmitting antennas or
the HF lines to the antennas
are defective.
Check the levels of the returnĆ
ing HF signals:
TX1/2 BITE ADC-1:
ACA1R too high
ASB1R too high
ASB2R too high
Are the return signals in order
when the transmitter is running
on dummy load?
If no success, search directly
via the displayed monitor fault.
Antenna and/or cable to
ASU defective for:
Carrier or cable
Cable fromSB1 to ASU
Cable fromSB2 to ASU
This is an indication of a
fault in the antenna syĆ
stem.
1.3 Only one moniĆ
tor shows a
fault.
Continue searching for a
monitor fault as from 8.1.
6.1.3.3 Status Check of the Microprocessor of the MSG-C (2)
Step Fault A B C
2.1 Statuscheck
by LEDs.
The bottomLED on the
MSG-C lights up continuĆ
ously. This is the Live lamp.
The bottomLED on the
MSG-C is off or lights up with
briefinterruptions.
The processor is running, ok.
The processor has stopped.
Every interruption is an indicaĆ
tion of a processor fault.
Attempt a reset; if the proĆ
cessor stops again, the
MSG-C is defective. Do
not repeat this; the procesĆ
sor must start up itself and
must not stop.
The second LED fromthe top
on the MSG-C lights up at
briefintervals.
The second LED fromthe top
on the MSG-C stays permaĆ
nently off.
The LCP polls the transmitter,
ok.
The LCP does not poll the
transmitter, or the transmitter is
not receiving the data.
1) Replace the MSG-C
2) Check the 64-pole flat
ribbon cables fromBP-C,
connector X82, to LCP,
and connector X71/TX1
(X72/TX2) to BP-T, conĆ
nectorX70.
3) Otherwise, replace the
LCP
The top LED on the MSG-C
lights up at brief intervals.
The top LED on the MSG-C
stays permanently off.
The transmitter is not sending
any data to the LCP
The transmitter is not respondĆ
ing to the polling calls of the
LCP.
1) The MSG-C is defecĆ
tive, and must be replaced
2) Check the 64-pole ribĆ
bon cable fromBP-C
(X71/TX1 or X72/TX2), to
BP-T, connector X70.