(4) Power converter.
(6) Test set (TS-3681/VSG-2).
b. The second part of the reference designator is used to
identify the location within the major unit, i.e., W1 for a wire
harness, A2 for a unit subassembly, etc.
c. The third part of the designator locates the actual component,
i.e., S1 for a switch, J2 for a jack, etc.
d. Following the reference designator, you will often find a pin
or pin socket identifier for marking the exact circuit point for
testing or troubleshooting.
e. The following examples are given to illustrate the use of
reference designators in the TTS, AN/VSG-2.
(1) 2 W1 S1.
This reference designator indicates S1 (mode
switch) on the wiring harness W1 in the gunner's display.
2 - Gunner's display (unit 2).
W1 - Wire harness W1.
S1 - Switch 1 (mode switch).
(2) 4 A6 J1.
This reference designator indicates connector
jack J1 of the auxiliary regulator (subassembly A6) in the power
4 - Power converter (unit 4).
A6 - Auxiliary regulator.
J1 - Connector J1.
(3) 2 W1 P4 (2 A3 J4).
This reference designator indicates
that the plug P4 of the wiring harness W1 in the gunner's display
mates with jack J4 of the RPU assembly (A3) in the gunner's display.
Gunner's display (unit 2).
Wire harness W1.
Connector plug P4.
Connector jack J4.
One procedure that requires an
understanding of reference designators in the TTS AN/VSG-2 is taking
Figure 1-46 is the voltage measurement table
for the power converter. The probe connections for the measurements
are indicated by the use of reference designators.