CHAPTER 3 GENERAL SUPPORT REPAIR PROCEDURES AND ADJUSTMENTS

TM 11-6665-209-40

CHAPTER 3

GENERAL SUPPORT REPAIR PROCEDURES AND ADJUSTMENTS

3 - 1 . GENERAL PARTS REPLACEMENT TECHNIQUES

All of the parts and assemblies in the radiac set can easily be reached without any

special procedures. After any repairs check calibration by use of AN/UDM-2.

Remove the batteries from the equipment before making any repairs.

NOTE

Before any part is removed, note the position of the part and its lead.

W i r e replacement parts in essentially the same position to avoid

undesired coupling and shorting together of wires. If necessary, use

tags.

3-2. DISASSEMBLY/ASSEMBLY PROCEDURES OF RADIAC SET AN/PDR-27J.

(Figures 3-1 through 3-3)

NOTE

General support maintenance includes all repair operations covered

in lower level manuals as well as those covered in this chapter.

a. Removal of Front Panel Assembly. (Figure 3-1). Loosen six screws (2) from front

panel assembly (1) and remove front panel assembly from housing.

b. Removal of Detector Assembly. (Figure 3-1).

(1) Remove terminal lug (29) from terminal board TB101 (28).

(2) Loosen nut (6) and remove detector cable (7) from front panel assembly (1).

c. Replacement of Detector Assembly.

(1) Insert detector cable (7) through top of front panel assembly and tighten nut

in subparagraph b (2) above.

(2) Replace terminal lugs removed in subparagraph b (1) above and tighten

screws.

d. Removal of Printed Circuit Board Z101 (PCB). (Figure 3-2)

(1) Remove three screws (32), four Iockwasher (21), three flat washers (31), four

nuts (22), and slowly remove Z101 PCB (25) from front panel assembly (1).

(2) Remove four plastic extension shafts (33), pressure plate (34), and pressure

spring (35), from front panel assembly (1).

(3) Remove terminal lugs from bottom row of terminal board TB101 (28).

(4) Remove connector plug (23) (Fig. 3-1), from battery compartment and remove

PCB from front panel assembly (1).

3-1