TM 11-6625-1696-12
5-6. Organizational Quarterly Preventive Maintenance Checks and Services Chart-Continued
Seq
Item
Procedure
Reference
No.
25
AMP FREQ MULT
a. Connect transmitter test facility J20 to RF modules
section.
test facility J28 using Cable Assembly CX-12028/U (3 ft).
b. Set transmitter test facility switches S1 to ON and
S6 to ON.
c. Set RF modules test facility switch S13 to ALC 1 and
shortcircuit J32 and J33. The + 28 V lamp should light.
d. Connect multimeter between J36 pin 1 (+) and J36
pin 5 (-) of the RF modules test facility; the multimeter
should indicate + 28 V dc + 2 volts.
e. Remove shortcircuit from J32 to J33, and connect
multimeter between J36 pin 15 (+) and J36 pin 14 (-), it
should read + 26 V dc + 2 volts.
disconnect Cable Assembly CX-12028/U.
26
AMP FREQ MULTIPLIER
a. Connect transmitter test facility J20 to RF modules
section
test facility J28 using Cable Assembly CX-12028/U (3 ft).
b. Set transmitter test facility switches S1 to ON and
S6 to OSC.
c. Set RF modules test facility switch S14 to NOR-
MAL, and shortcircuit connectors J38 and J39. The +28
V lamp should illuminate.
d. Connect multimeter between J42 pin (+) and pin (-)
of the RF modules test facility. The multimeter should
indicate + 28 V dc +0.5 V dc.
e. Connect multimeter between J42 pin 13 (+) and pin
14 (-). The multimeter should indicate 0 volt +0.1 volt.
f. Set switch S14 to X 16, the multimeter should in-
dicate + 26 V dc + 2 volts.
disconnect Cable Assembly CX- 12028/U.
27
MULTIPLIER
a. Connect receiver test facility J12 to RF module test
section
facility J29 using Cable Assembly CX-12061/U (3 ft).
b. Set receiver test facility switches S1 to ON and S6 to
OSC.
c. Set RF modules test facility switch S15 to NOR-
MAL. The +12 V lamp should illuminate.
d. Connect the multimeter between J46 pins 1 (+) and 2
(-) of the RF modules test facility. The multimeter should
indicate + 12 V dc +0.5 volt.
e. Set receiver test facility switch S1 to OFF.
28
Adapter-connectors in
units 4 and 5.
Check continuity of the center conductors and ensure
that the center conductors are not shorted to the outer shell.
29
Waveguide probes
in units 4 and 5......... Repeat sequence No. 28 procedure.
30
Short circuit terminations. Check continuity of the center conductor to the outer shell.
31
Special purpose
electrical cable
Assemblies
multimeter, check the continuity of all pins between the
connectors of each cable.
b. Use Insulation Tester AN/GSM-6 set for 500 V and
check the insulation between pins.
32
RF cable assemblies. Check continuity of the center conductors and ensure
that the center conductors are not shorted to the shield.
5-7
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