DIRECT SUPPORT MAINTENANCE
Section I. G E N E R A L
(1) General troubleshooting (para 4-3 to 4-7).
4-1. Scope of Maintenance
(2) Operational testing (para 3-21).
a. This chapter contains instructions covering di-
(3) Troubleshooting (para 4-3 through 4-9).
rect support maintenance for Radiosonde Recorder
(4) Adjustments and alinements (para 3-25
AN/TMQ-5(*). It includes instructions for replace-
through 3-37,4-12 and 4-13).
ment of specified direct support maintenance parts
(5) Replacement of authorized parts (para 4-10
and intructions for troubleshooting and repair pro-
cedures to be accomplished by direct support mainte
(6) Dynamic testing (chapter 5).
nance personnel. This section supplements those in-
structions in previous chapters of this manual where
4-2. Tools, Test Equipment, and Materials
direct support maintenance is referenced. This sec-
tion provides replacement procedures which must be
For tools, test equipment, and materials required for
perfomed at direct support category. Maintenance
direct support maintenance of Radiosonde Recorder
procedures for all categories of maintenance are
AN/TMQ-5(*), refer to TM 11-6660-204-25P and
listed in appendix B.
b. Direct support maintenance of Radiosonde RE-
corder AN/TMQ-5(*) includes--
Section Il. TROUBLESHOOTING
immediately self-evident. If not, proceed to the trou-
bleshooting chart (para 4-9) in further localize the
a. Procedure. The first step in servicing a defective
equipment is to sectionalize the fault. Sectionaliza-
c. General Precautions. Whenever the equipment
tion means tracing the fault to the major component.
is serviced, observe the following precautions very
The second step is to localize the fault. Localization
means tracing the fault to the defective section of a
(1) Be careful when panels are opened; danger-
particular component. The third step is isolating the
ous voltages are exposed.
fault to the defective part. Some faults such as meter
(2) Careless replacement of parts causes new
indications or binding of mechanical components can
faults. Note the following points:
be isolated by sight or hearing. The majority of faults
(a) Before a part is unsoldered, note the posi-
must be isolated by detailed mechanical checks.
tion of the leads. If the part, such as a transformer,
b. Sectionalization Check. When an operational
has a number of connections, tag each of the leads.
test (Para 3-21) indicates a fault, the cause may be