LLZ 421
Operation Operation and Maintenance
ILS 420
3−8 Ed. 01.07SOAC
Control Test point Function Remarks
stdby RF in
Gain adjustment input
R2
R511
R25
R240
R217
TP2, TP47
TP75
TP4
TP22
TP20
IF gain adjust of LLZ Stby CRS CSB
GP active only: IF gain adjust of Stby CSB A2
IF gain adjust of LLZ Stby CRS SBO
LLZ−2F only: IF gain adjust of Stby CLR SBO
LLZ−2F only: IF gain adjust of LLZ Stby CLR CSB
−
−
−
−
−
stdby IF path phase adjustment
R524
R123
R136
R305
R318
TP76
TP75
TP1
TP5
TP3
TP19
TP23
TP21
GP active only: Phase adjust of Stby CSB A2 signal
used for mid set of R524 resistance range
Phase adjust of LLZ Stby CRS CSB signal
Phase adjust of LLZ Stby CRS SBO signal
used for mid set of R136 resistance range
LLZ−2F only: Phase adjust of LLZ Stby CLR CSB signal
LLZ−2F only: Phase adjust of LLZ Stby CLR SBO signal
used for mid set of R318 resistance range
−
factory aligned
factory aligned
−
factory aligned
factory aligned
−
factory aligned
stdb IF path Level adjustment output
−
−
R499
R133
R312
TP77
TP47
TP72
TP49
TP34
GP active only: IF level measurement Stby CSB A2 path
IF level measurement Stby CSB Posn. output signal
IF level adjust of LLZ Stby CRS CSB
IF level adjust of CRS Stby Width output signal
IF level adjust of CLR Stby Width output signal
−
−
−
−
LLZ−2F only
GP only: Phase detector (Optional)
not used in LLZ
R485 TP69
TP67
GP only: Phase zero adjustment
used for mid set of R485 resistance range
factory aligned
factory aligned
Antenna configuration and signal processing mode selection:
Control Selection Processing Mode Remarks
Switch
bank
J19 1−2
3−4
5−6
7−8
9−10
11−12
13−14
15−16
Hardware setting of signal processing mode, see also 6.6.5.
M−array standard (GP, M−Type)
M−array TSIS* (GP active, M−Type)
Sideband reference (GP, B−Type)
Null reference (GP 0−Type)
Dual frequency LLZ detector mode (Dipole/Reflector, LPD antenna)
Dual frequency LLZ int. width (LPD ant. and CU part no. 120631−0001)
spare
spare
factory aligned
also used: 3−4
also 2F standard
−
−
−
−
−
−
* TSIS = True Signal in Space
Other test point:
Control Test point Function Remarks
TP55 Transfer switch signal from ECU −
Power supply test points:
Control Test point Function Remarks
TP56
TP57
TP58
TP30
+15 V
+5 V
−15 V
GND
−
−
−
−
Ed. 01.10
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