Section III. TROUBLESHOOTING INFORMATION

TM 11-5826-257-24

Table 4-2. Bench test preventive maintenance

ITEM TO BE INSPECTED

Sequence

Worktime

PROCEDURE

number

Total task hours required: 1.24

0.08

RECEIVING SET

Sequence

ITEM TO BE INSPECTED

C h e c k to see that receiving set is

number

PROCEDURE

Worktime

complete. Refer to table 1-1.

PUBLICATIONS

0.08

GLIDESLOPE RECEIVER SEC-

Check to see that all pertinent pub-

0.5

TION

lications are available. They must

P e r f o r m the following tests in ac-

be complete and in usable condi-

cordance with paragraph 4-16:

t i o n , without missing pages. All

a. Rf sensitivity test.

changes pertinent to this publica-

b. Course centering test.

tion must be on hand. Refer to DA

c. Deflection sensitivity test.

Pam 310-4.

d. Agc response test.

0.08

MODIFICATION WORK ORDERS

e. Warning signal test.

Check to see that all URGENT

MARKER BEACON RECEIVER

MWO's have been applied to the

0.5

SECTION

equipment and that all NORMAL

P e r f o r m the following tests in ac-

MWO's have been scheduled. Re-

cordance with paragraph 4-17:

fer to DA Pam 310-7.

a. Audio output power test.

b. Lamp actuation test.

RECEIVING SET

c. Threshold sensitivity test.

Manhours required:

Section III. TROUBLESHOOTING INFORMATION

Provide thorough ventilation whenever

4 - 6 . General

used. DO NOT USE NEAR AN OPEN

Troubleshooting the receiver is limited to the

FLAME. Trichloroethane is not flamma-

flight line tests in paragraphs 4-11, 4-12 and 4-13

ble, but exposure of the fumes to an open

and the bench tests in paragraphs 4-14 through

flame or hot metal surface forms highly

4-17. Corrective action is limited to replacing

toxic phosgene gas.

faulty components as described in paragraphs 4-9

b. Remove grease, fungus, and ground-in dirt

and 4-10. No further troubleshooting or corrective

from the equipment case and mounting; use a

action is authorized. When any defect in the

cloth damp (not wet) with trichloroethane.

receiver operation is found during the bench tests,

stop all testing and return the receiver to the

c. Remove dust or dirt from cable and equip

manufacturer. The mount, vibration isolators, and

ment connectors with a soft brush. Remove

ground straps can be replaced.

grease or grime with a lint-free cloth moistened

with trichloroethane. Dry with compressed air.

4-7. General Maintenance Information

Maintenance of the radio receiver is limited to the

4-9. Removal and Replacement of Receiver

procedures in this section and the following sec-

a. Removal.

tions in this chapter. Personnel are cautioned that

the manufacturer's warranty is voided if the

(1) Disconnect the cables from the front of

receiver is opened by military personnel or if

the receiver.

repair beyond that covered in this manual is

(2) Loosen the thumbscrew on the front of

attempted. Components found defective in the

the mounting tray enough so that the lip on the

bench tests in paragraphs 4-16 and 4-17 are to be

bottom of the receiver will clear the clamp.

returned to the manufacturer.

(3) Lift the front end of the receiver slightly

and slide it off the mounting tray.

4-8. Cleaning

b. Replacement.

Inspect the exteriors of the receiver and mount-

(1) Slide the receiver into the mounting tray.

ing. The exterior surfaces and vibration isolators

Be sure that the lip on the rear of the receiver

on the mounting should be free of dust, dirt,

fits snugly under the lip on the back of the

grease, and fungus.

mounting tray.

a. Remove dust and loose dirt with a clean, soft

(2) Place the clamp over the lip on the front

cloth.

of the receiver and tighten the thumbscrew.

WARNING

(3) Connect the cables to the front of the

The fumes of trichloroethane are toxic.

receiver.

4-2