36 MB pdf download - VIR History

3 Section
Porogroph 2 b (9)
the coating shall be applied effectively and completely
over all strrfaces to be treated . . . "
"D-2a. Cleaning.-All surfaces of parts to be coated
shall be sufficiently clean so that they are free from
dirt, oil, grease or other foreign matter which could
interfere with the adherence or proper functioning of
the material. All readily visable deposits of the rosin
shall be cleaned off as much as practicable by scrapiug,
chipping, etc. Joints with no readily visable deposits
of rosin need not be cleaned. The use of solvents
such as alcohol or acetone is not advisable as it
tends to spread a thin coat of rosin over a large area."
"D-zb. DRYINC OF EQUIPMENT.-The coating
rraterial shall be applied only on dty surfaces. In no
case shall the coating materials be applied on wet or
damp materials with moisture on their surfaces . . , "
WARNING
The Anti-furlgus agent is poisonolrs. - Do not
inhale furnes and avoid contact with the skin
until the material is drv.
c. CORRECTIVE N4AINTENANCE.-Qslrective
Maintenance includes location, isolatioil, and repair
of failures of the equipment r,r'hich affect its operatittg
characteristics. This section contains information to
aid personnel in locating and correcting trouble.
Proper maintenance of equipment will do much to prevent
and minimize failures of the equipment. To
assist personnel in Corrective Maintenance, the Signal
Distribution Units are equipped with electronic components
which will readily detect failures or abnormal
conditions. The instruments include the Navy Model
ZM-I/U Ohmmeter, the Navy Model OBQ-4 Volt-
Ohm-Milliammeter. Navy Model OBL-3a Oscilloscope,
etc. The operation and use of these instruments is
fully covered in the applicable instruction books listed
in Tables 1-4 to l-6 inclusive.
A trouble light for use when working in the cabinets,
and convenience outlets for solderittg irons, electric
drills, etc., are included in each cabinet.
(t) WIRING.-In the Signal Distribution Units
one of the more probable sources of trouble is the internal
wiring. The most common troubles in the wiritrg
are as follows:
(a) GROUNDED OR PARTIALLY GROUND-
ED CIRCUITS.-A circuit which is grounded is a circtrit
in which one or both sides of the circuit make
contact with the ground, i. e., the electrical ground.
A grotrnd on one side of a circuit does not necessarily
make the circuit inoperative, but should another
ground develop on the opposite side of the line, the
circuit will fail. It is therefore essential that grounds
be cleared as soon as possible after they are detected.
NAVSHIPS 9rO47
RESTRICTED
MP.IhITENI\hICE
Grounded cables are readily detecte