TM 11-5805-689-14
MAINTENANCE
below for obvious defects; such as broken wires,
loose connections, or other physical damage.
Maintenance instructions provided in this chapter
a. Digit keysender
are for organizational-field maintenance only. The
b. SEIZE, RELEASE and ACCESS pushbuttons
procedures that follow apply to the Converter,
c. Binding posts for field wire terminations
T e l e p h o n e Signal CV-1919/G, regardless of its
d. Night alarm
location. Restrictions are imposed only by the im-
e. Connectors on back of channel and common
mediate circumstances involved, the availability of
circuit modules
spare parts, tools, test equipment and the skill of the
f. Battery compartment
maintenance technicians. The printed wiring card
and digit keysender, a r e not considered to be
11.5 Seating
organizational field maintenance items. They are
Check for proper seating (good connection) of
direct replacement assemblies which must be for-
Channel Modules and Common Circuit Modules to
warded to a depot or the manufacturer for overhaul
the mating connectors in the combination case. (See
or replacement.
Section II on component replacement.)
The organizational-field maintenance of the con-
11.6 Wire Terminations
verter consists of the following:
Check the field wire terminations on the back of the
Converter (back cover removed).
11.7 Wiring
Check the wiring between all switches and assem-
through 13.12)
blies.
P a r t s , and
11.1. Tools,
Replaceable
Test
11.8 Contacts
Equipment Required to Perform Maintenance
Check all switch and telephone jack contacts for
procedures
obvious physical defects.
11.9 Batteries
a
Screwdriver, Flat Tip (medium size)
Check battery connections.
b.
Screwdriver, Cross-Recessed (medium size)
11.10 Troubleshooting Procedure
Needle Nose Pliers
c.
11.10.1 General. Conduct the tests called out in
Flat Nose Pliers
d.
Cutters or Wire Strippers
failure to the Converter. Refer to the troubleshooting
Alignment Tool
11.2. Replaceabl Parts
symptoms.
NEC Part Nr.
11.10.2 Should the keysender or telephone jacks
a
Common Circuit Module Assembly
appear to be damaged and/or to require adjustment,
Channel Circuit Module Assembly
b.
refer to paragraah 10.12 or 10.18.2 respectively.
c.
Combination Case Front Cover
1 1 . 1 0 . 3 Faulty Component Parts. Remove the
d.
Combination Case Rear Cover
faulty component part and replace it with one known
e.
Batteries - four D-size battery cells
to be operative, u s i n g the procedure given in
11.3 Test Equipment
NEC Part Nr.
the batteries are in peak condition. Check the
a
battery voltage at the external battery binding posts
equivalent)
located on the back of the unit (see Figure 2). Be
b. Test Cable (2)
c a r e f u l to use proper polarity. Battery voltage
11.4 Visual Inspection
paragraph 3 for
information concerning the in-
Before conducting any extensive troubleshooting,
stallation of battery cells and replace with fresh ones
visually check the Converter for obvious faults. This
if necessary. Check the installation of the batteries
will save repair time and can also avoid further
for proper polarity.
damage to the Converter. Inspect the items listed