Raytheon 138-119 Operator's And Service Manual page 12

Caption:
"A"
"B"
"A In1"
"B In2"
"A Out"
"B Out"
"System Failure"
The switch--over--relays in the Change Over Box are controlled with a switching voltage of
24 V DC. This switching voltage is generated in the Change Over Box, led to the Change
Over Switch.
The operation of the Change Over Box is possible with three different switch positions:
-- Automatic switch--over because of a fail.
-- Manual switch--over to system 1.
-- Manual switch--over to system 2.
Edition: April 06, 2005
Change Over Box
138- -119
= Signal "A"
= Signal "B"
= Signal "A" at the output "System 1"
= Signal "B" at the output "System 2"
= switched signal "A"
= switched signal "B"
= Failure message of "compass system 1"
NOTE
Some of the relay outputs are led via fuses from the
Change Over Box to the connected receivers.
This fuse protection serves to prevent effects to the
Change Over Box in case of a fault in a connected
heading receiver.
NOTE!
A.m. Figure 4 shows a principle of switch--over
The actual connections are shown in the appended wiring
diagrams.
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