C 3, TM 11-6625-1683-15
commutator switch in the antenna drive as-
b. DRIVE switch S10 is a single-pole, single-
throw toggle switch. In the closed circuit con-
sembly. FWD/REV switch S15 is a double-
dition, it delivers 6 volts to pin J9E. Func-
toggle
double-throw,
three-position
pole,
tioning of this circuit is indicated by DRIVE
switch. In the FWD position, it connects pin
pilot lamp DS4, which connects to pin J9-F.
J13-1 to ground, pin J16-A to 6 volts, and
pin JI5-B to ground; in the REV position, it
c. FWD/REV switch S11 is a single-pole,
connects pin J13-1 to 6 volts, pin J15A
double-throw toggle switch. In the FWD posi-
to ground, and J16-B to 6 volts; in the
tion, it delivers 6 volts to pin J9-L. In the
OFF position, i t disconnects pins J13-1,
REV position, the 6 volts is applied to pin
JI5-A, and J16-B from ground and from dc
J9-K. Operation of this switch provides range
voltage.
gate position control, and functioning is indi-
c a t e d by pilot lamp DS5, which connects
d. TEST potentiometer R64 provides a
to pin J9-J.
variable voltage ranging between 0 and -6
volts. TEST ON/OFF switch S12 is a single-
d. LV potentiometer R26 provides a means
pole, single-throw toggle switch. In the ON
of varying the 6 volts supplied to the low-
position, it closes the circuit between the volt-
voltage cutout circuit of the radar set relay
age take-off point on potentiometer R64 and
control assembly. Connection is made through
pin J13-14 and is employed as a motor control
pin J9A. The applied voltage is monitored
test,
at LV test jack TP63. Functional indication
is provided by LV pilot lamp DS6, which is
connected to pin J9-B. DLY pilot lamp DS3
5-18. Block 1000 Antenna Drive Unit
indicates operation of the time delay circuit
Test Circuit
and connects to pin J9M.
5-20. Block 2100 A-Scope Display Assembly
a. Connector J14 provides a means of in-
Test Circuit
terconnection with the radar set antenna drive
assembly. Through this connector, power and
circuit connections are established, The con-
a. Connectors J20 and J21 provide a means
nector is mounted behind a protective flap
of circuit and power connection to the radar
marked AZ DRIVE, This prevents accidental
set A-scope display assembly. ON/OFF switch
contact with the +300 volts carried by pin
S20 is a three-pole, two-position toggle switch.
J14-M.
In the ON position, the first pole applies +12
b. SWP test
jacks TP24 and TP25 connect
volts to pins J20-4 and J20-6. The second
to pins J14-K
and J14-H, respectively, and
pole feeds 12 volts to pin J202. The third
enable tests to
be made on the output of the
pole supplies +35 volts to pin J21-9. In the
antenna drive
sweep pontentiometers in the
OFF position, the + 12-volt circuit is con-
radar set,
nected to dummy load resistor R42, while the
+35-volt circuit is connected to dummy load
5-19. Block 1200 Relay Control Test Circuit
resistor R43.
b. The +300-volt supply connects to the
A-scope display centering circuits in the radar
a. Connector J9 provides a means of inter-
connection between the test circuits and the
set through pin J21-8. MARKER switch S18
radar set relay control assembly. ON/OFF
is a single-pole, single-throw toggle switch. In
switch S24 is a single-pole, single-throw tog-
the closed condition, it applies 6 volts to pin
gle switch. In the ON position, it closes the
J20-7, which serves to control marker width.
circuit between the 5-volt source and pin
GATE DELAY switch S19 is a single-pole,
J9-H.
single-throw toggle switch, In the closed con-
5-11
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