Waveguide Switch 3A 3.
(1) Remove W5P8 from 3A3J1.
Local Control/Monitor Assembly, Unit 1, is connected by
(2) Remove four cap screws at the 3A3/3A8
cable to Modules 2A1, 2A2, 2A3, 3A1 and 4A1 and to the
inter face (Port 2 of 3A3).
primary input power (3 phase, 120 12 V, 55 8 Hz).
(3) Remove four cap screws at the 3A3/3A 12
Remote Control/Monitor Assembly 3A1I is connected by
inter face (Port 4 of 3A3).
cable to Unit 1, Modules 3A2, 3A3 and to + 28 V primary
(4) Remove four cap screws at 3A3 Port 1
power. Four cables (W1, W2, W3, W4) are used per
interface and remove 3A3.
channel and one cable (W5) interconnects both
(5) To replace 3A3, connect the output
channels. (W3 and W4 provide Unit 4 interconnections.)
waveguide to 3A3 Port 1 with four cap screws removed
in (4) above, connect 3A12 to Port 4 of 3A3 with four cap
screws removed in (3) above, and connect 3A8 to Port 2
from 3A1 (3A1J1, fig. 3-19). Two illustrations show the
of 3A3 with four cap screws removed in (2) above.
cable wiring (W1, W2, fig. 3-20 and W3, W4, W5, fig 3-
Reconnect W5P8 and 3A3J1.
21). These illustrations are presented as aids in system
h. Other Unit 3 Waveguide Assembles.
continuity checking, should such become necessary.
remove other Unit 3 waveguide assemblies (3A4, 3A6,
These illustrations along with the appropriate schematic
3A7, 3A8, 3A9, 3A10, 3A11, 3A12) start by
Then release the other end of the assembly, as
from one unit or module to another. Continuity checking
is accomplished with primary power disconnected (W5
not connected to 120 V and 28 V sources).