Thales 421, Эксплуатация и обслуживание, Страница: 147 / 256

TEST DATA SHEET
LLZ/GP
Operation and Maintenance Maintenance
ILS 420
6−7
Ed. 01.10 SOAC
6.2.8 Performing Check of Shutdown Paths
NOTE: This procedure will take the station out of service.
The shutdown paths are checked for both Shutdown A path (carrier off) and Shutdown B path (modu-
lation off) for the TX1 and TX2 each. Use Oscilloscope with probes for signal check at ECU (voltage)
and MODPA TP1 (CSB) and TP2 (SBO). If any test fails the ECU, SYN or LGA card should be replaced
before the system is put back into service. The procedure should be accomplished without removing
the ECU card from the equipment cabinet. The jumper should be repositioned without removing
power from the ECU card. When a jumper is in any of the ’park’ positions, the ECU will not have a
test fault. The park positions are used only to hold jumpers. To perform this check, use proposed form
and maintain it in station records. Fig. 6−2 shows the jumper and testpoints. With ECU board
120571−0003, regard the different jumper label noted. Proceed as follows:
− Set key lock switch at LCP to ’Maintenance’. After the test, set key lock switch to previous position.
− Log on to system in level 4. With transmitters on, verify that there are no alarms, alerts or ECU faults
other than the maintenance switch notice indicated on the LCP screen. If there are, troubleshoot
and correct before continuing.
The form comprises following checks:
− Functional test modulation shutdown path TX1 (Shutdown 1B, Shutdown 1A disabled)
− Functional test modulation shutdown path TX2 (Shutdown 2B, Shutdown 2A disabled)
− Functional test Synthesizer carrier shutdown path TX1 (Shutdown 1A, Shutdown 1B disabled)
− Functional test Synthesizer carrier shutdown path TX2 (Shutdown 2A, Shutdown 2B disabled)
− Functional test of Control Logic 1 and 2 and 3rd Shutdown Path (incl. clock detector)
Up to 8 jumpers should be available to perform the test settings.
set
open
21
3
21
3
65597 / 120571
S/N
/1
/1
/1
/1
/1
/1
J4
J5
J6
J7
J8
J9
J10
J11
ON
EXEC
Field
STBY
Bypass
Alarm Mon1
Alarm Mon2
On
Alarm Mon1
Alarm Mon2
Bypass
Alarm Mon1
Alarm Mon2
Bypass
Equipment 1
3 RD Off
Integrity Fail
Switch Fail
Executive
gn
ye
rd
rd
gn
ye
rd
rd
ye
rd
rd
gn
rd
rd
rd
Board Reset
/3
/5
/7
/9
/3
/5
/7
/9
/3
/5
/7
/9
/3
/5
/7
/9
PARK position
Do not use a metallic aid to set or re-
move the jumper on J8 to J11 to avoid
a short circuit at any board next ECU.
CAUTION
MODPA front
Oscilloscope
Shutdown B
Modul./LGA1
Shutdown A
Carrier/SYN1
Shutdown B
Modul./LGA2
Shutdown A
Carrier/SYN2
Verification of CSB/SBO off at MODPA
ECU front
SYN front
VCO’s off (LED)
jumper J9 to 11
behind LED
/2
/2
/2
/2
/4
/6
/8
/10
/4
/6
/8
/10
/4
/6
/8
/10
/4
/6
/8
/10
Testpoints for
voltage measurement
>4 V
J7
TP1 (CSB)
TP2 (SBO)
GP: LLZ:
TP1 (CSB)
TP2 (SBO)
−0001/0002
NOTE:
Jumper label ECU 120571
0001/0002
0003
J9 = J1
J8 = J3
J11 = J4
J10 = J5
Fig. 6−2 ECU, location of J8,J10, J9,J11 and testpoints; MODPA location of testpoints TP1,TP2