Thales 421, Operation And Maintenance, Page: 70 / 256

LLZ 421
Operation Operation and Maintenance
ILS 420
3−4
Ed. 01.07 SOAC
Board Indicator Color Control Function of control or indicator (lit or flashing)
ECU cont. Board reset
Lamp test
DipFix Switch
SW1
press to reset ECU board, if e.g. SW1 settings
changed
Press to test all indication LED’s.
Hardware setting of system configuration, see
6.6.5.
Remark:
If this setting is changed, the ’Board reset’ key
has to be executed to achieve settings.
Settings of SW1 must correspond to the
Software Configuration settings ( with PC user
program).
SYN LED, VCO red Normaly off; indicates VCO’s off
LCP LED
HD LED
green
red
Reset key
R1
Indicates LC−CPU is alive
HD−r/w operation (RAM), flashes if access
Restarts the LCP processor and software
Controls brightness of the LCD screen
DCC−MV LED, Input state green Normaly on; DC input voltage available
ACC−54 LED, Input state green
Mains Switch
R32
Normaly on; DC input voltage available
Switches ACC−54 to mains (ON/OFF)
Allows fine adjustment of battery charging
voltage
DC supply
BP−PS,
rear
TX1
TX2
Fuses:
F4
F5
main switch for power on of transmitter 1
main switch for power on of transmitter 2
T1.0H, 250 V, protects 48 V to LG−A 1/2 and
to DCC−5 converter
T6.3H, protects DC supply line to collocated
equipment (e.g. DME)
VAM−ILS
(option) LED H1
LED H2
LED H3 green
green
green
Switch S1
R1
R2
Voice signal present
Mic. input selected
Line input selected
Used to select voice input Line (1) or Mic. (2)
Used to set the reference voltage for the level
detector; default setting 5 V.
Used to adjust the output signal to LG−A/1.
Set such, that with 700 mVrms at X18 the out-
put amplitude is 3.75 Vrms, i.e. 10.6 Vpp for a
maximum modulation depth of 40 %.