installation kit (as vehicle whip antenna).
Other types of antenna are
available for special applications.
16.
FLOWCHARTS.
a. Rectangles. Rectangles are instruction blocks.
When you arrive at
one, follow the instructions contained therein.
b. Diamonds. Diamonds are decision blocks based on a yes or no answer
to the material contained therein, such as a clicking sound in the handset
at turn-on. If a clicking sound is heard in the handset at turn-on, follow
the line marked yes to the next instruction block. If the clicking sound is
not heard in the handset at turn-on, follow the line marked no to the next
instruction block.
If a yes or no line leads to a numbered or lettered
circle, you will find another circle with the same number or letter, which
leads you into the next decision or instruction block. When an instruction
block is reached that tells you to replace XXXXX, you must replace that item
and then do an EPC on the AN/GRC-213.
17.
REPLACEMENT.
a. Replacement instructions for all replaceable components are included
with the troubleshooting chart for the AN/GRC-213 radio set. Parts of these
instructions apply to replacement of components of the AN/PRC-104(A) radio
set as well.
If replacement components are not available within your
organization, the components must be procured from your direct support (DS)
activity through the direct exchange (DX) system.
b. In addition, you will be responsible for maintenance of the battery
packs CY-7875/PRC-104 containing batteries BB-590/U, which are rechargeable
nickel-cadmium sealed units. The PP-624/U battery charger is the authorized
battery recharger. The battery national stock number (NSN) is 6140-01-063-
3918, and it is rated at 24 volts 1.5 amp hours at 18 amps.
The battery
should be charged at a constant current of 360 milliamperes (ma) for 6
The battery temperature should be between 40 F and 100 F during
hours.
charge. Power supply PP-7333/GRC is the authorized power supply for fixed
station use.
c. Organizational-level corrective maintenance starts with isolating a
fault within the AN/GRC-213 (Figure 23) to a replaceable component.
The
faulty component is then replaced, and the EPC is run to verify proper
operation of the AN/GRC-213. Fault isolation at this level is done with the
AN/GRC-213 mounted on an installation kit that is mounted in a vehicle.
Fault isolation for AN/PRC-104(A) is included as a flowchart. (See Figure
24.)
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