Thales 421 - Page 202

LLZ 421
Repair Operation and Maintenance
ILS 420
6−60 Ed. 01.10SOAC
JUMPER POSITION DEFINITION REMARKS
X18 set
open
Normal operation
Filter measurement and fault location
Default setting
Factory use only
X19 set
open
Optional mute output N11/7 enabled. Mute
signal is controlled by level detector.
Optional mute output N11/7 disabled
−
Default setting
X20 set
open
Normal operation
Level detector test and fault location
Default setting
Factory use only
X21 set
open
Optional mute output N1/7 enabled. Mute
signal is controlled by level detector.
Optional mute output N1/7 disabled.
−
Default setting
X22 set
open
Signal from microphone input available
Signal from microphone input interrupted
Default setting
−
X23 set
open
VCA compression (N19) disabled (gain set)
VCA compression (N19) enabled
Factory use only, test purpose
Default setting
X24 set
open
VCA compression (N18) disabled (gain set)
VCA compression (N18) enabled
Factory use only, test purpose
Default setting
X25 set
open
Normal operation
Fault location, test of high pass filter
Default setting
Factory use only, test purpose
X26 set
open
Normal operation
Fault location, test of low pass filter
Default setting
Factory use only, test purpose
X27 set
open
Normal operation
Fault location, test of notch filter
Default setting
Factory use only, test purpose
X28 set
open
Normal operation
Fault location, test of low pass filter
Default setting
Factory use only, test purpose
X29 set
open
Microphone shield connected to ground
Microphone shield not grounded
Default setting
−
X30
set
open
Gain adjust of pre−amplifier 1 (Line Input):
Gain = 6 to 40 dB, adjustable with R4
Gain = 0 dB
R4 left: 6 dB, R4 right: 40 dB
Default setting
X31
set
open
Gain adjust of pre−amplifier 1 (Mic. Input):
Gain = 6 to 40 dB, adjustable with R5
Gain = 0 dB
Default setting; set to 20 dB,
R5 left: 6 dB, R5 right: 40 dB
−
X32 set
open
Line signal available after pre−amplifier 1
Line signal Interrupted after pre−amplifier 1
Default setting
Factory use only, test purpose
X33 set
open
Mic. signal available after pre−amplifier 1
Mic. signal Interrupted after pre−amplifier 1
Default setting
Factory use only, test purpose
SWITCH POSITION DEFINITION REMARKS
S1 1−3
2−3
Line input selected, lower position
Microphone input selected, upper position
default setting
−
8 Voice Amplifier ILS 420 (VAM−ILS 420) 83138 30700 2 of 2
NOTE: If need be, regard and refer to following decription of VAM−ILS line input calibration procedure.