Chapter 4. DIRECT SUPPORT MAINTENANCE

TM 11-6660-204-25

CHAPTER 4

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-

and 4-11).

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-

Required

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.

TM 11-6660-204-24P-1.

b. Direct support maintenance of Radiosonde RE-

corder AN/TMQ-5(*) includes--

Section Il. TROUBLESHOOTING

4-3. General

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

trouble.

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

carefully:

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

4-1