Section I. PREVENTIVE MAINTENANCE
products of decomposition are toxic and
4-1. Scope of Maintenance
irritating. Since TRICHLOROTRI-
F L U O R O E T H A N E dissolves natural
(1) Operator and organizational preventive
oils, prolonged contact with skin should
maintenance is the systematic care, servicing, and
be avoided. When necessary, use gloves
inspection of equipment to prevent the occurrence of
which the solvent cannot penetrate. If the
trouble, reduce downtime, and to maintain the
solvent is taken internally, contact a
equipment in serviceable condition. Preventive
maintenance procedures for the AN/PTM-7 are
(1) Use a dry, clean, lint-free cloth or brush to
performed weekly, monthly, and quarterly; specific
remove dust and dirt. If necessary, moisten the
cloth or brush with cleaning compound. After
4-4. Troubleshooting information is provided in
cleaning, wipe dry with a clean cloth.
authorized repair parts and running spares.
(2) Defects that cannot be corrected must be
Compressed air is dangerous and can
reported to higher category maintenance personnel.
cause serious bodily harm if protective
Records and reports of repairs and preventive
means or methods are not observed to
maintenance must be made in accordance with
prevent a chip or particle (of whatever
procedures given in TM 38-750.
size) from being blown into the eyes or un-
b. Preventive Maintenance Checks and Service
broken skin of the operator or other per-
Periods. Preventive maintenance checks and ser-
sonnel. Compressed air shall not be used
vices for Test Set, Telephone AN/PTM-7 are
f o r cleaning purposes except where
reduced to less than 30 psi, and then only
with effective chip guarding and per-
formed during the specified intervals. In addition,
sonnel protective equipment. Do not use
the weekly checks and procedures must be per-
compressed air to dry parts when TRI-
formed under the following special conditions:
C H L O R O T R I F L U O R O E T H A N E has
(1) When the equipment is initially received and
(2) Dry compressed air, not to exceed 30 pounds
(2) Before each use of the equipment by a
per square inch, may be used to remove dust and
lineman on a cable link.
dirt from inaccessible places.
d. Touchup Painting. Remove rust and corrosion
from metal surfaces by lightly sanding them with
Adequate ventilation should be provided
fine sandpaper. Brush two thin coats of paint on
while using TRICHLOROTRIFLUORO-
bare metal to protect it from further corrosion.
ETHANE. Prolonged breathing of vapor
Refer to the applicable cleaning and refinishing
should be avoided. The solvent should not
practices specified in TB SIG 364.
be used near heat or open flame; the
4-2. Operator's Weekly Preventive Maintenance Checks and Service Chart
Item to be inspected
Carrying sling . . . . . . . . . . . . . . Check canvas carrying sling for wear or tear.
Completeness . . . . . . . . . . . . . . . S e e that all accessories in accessory box are present. No
overstock should be evident, and all shortages must be on valid
3 . . . . . . . . . . . Connectors. . . . . . . . . . . C h e c k t i g h t n e s s o f a l l c o n n e c t o r s . C o n n e c t p r o b e s a n d
H-91A/U to connectors to check tightness. Use connectors of a
spare TD-206/G to check connectors 1 through 8.
4 . . . . . . . . Meter glass and indicator lens . C h e c k T E S T M E T E R g l a s s f o r c r a c k s o r o t h e r d a m a g e .
Check CALL indicator lamp lens.
5 . . . . . . . . Rubber bumper . . . . . . . . . . . . . C h e c k c a s e a s s e m b l y t o p f o r p r e s e n c e o f r u b b e r b u m p e r
Which engages BATTERY POWER switch.
Change 5 4-1