Switch Position "System 1; Switch Position "System 2 - Raytheon 138-119 Operator's And Service Manual

2.1.2

Switch position "System 1"

If the Change Over Switch is switched into position "Sys 1" manually, the signal outputs of
the compass system 1 are carried out of the Distribution Box via the Switch Over Box
(see Figure 4).
The connection of the relay "System Failure" of system 1 (DU 1) via the Change Over
Switch is not used. The 24 V DC potential is not switched to the relays of the Change Over
Box. All relays are dropped out.
2.1.3

Switch position "System 2"

If the Change Over Switch is switched into position "Sys 2" manually, the signal outputs of
the compass system 2 are carried out of the Distribution Box via the Switch Over Box
(see Figure 4).The connection of the relay "System Failure" of system 2 (DU 2) via the
Change Over Switch is not used. The 24 V DC potential is fed from the Change Over Box
via the Change Over Switch and back again to the Change Over Box. All relays operate.
3769DOC000002
Change Over Box
138- -119
ATTENTION!
There is no automatic switch--over to DU 2 if the
DU1 fails ("System Failure").
The Change Over Box does not switch signals
from the outputs of the Distribution Unit 1 to the
heading receivers.
ATTENTION!
There is no automatic switch--over to DU 1 if the
DU2 fails ("System Failure").
The Change Over Box does not switch signals
from the outputs of the Distribution Unit 2 to the
heading receivers.
9
COMPASS
STD22
Edition: April 06, 2005