DISASSEMBLY/ASSEMBLY PROCEDURES OF DETECTOR DT-196/PDR-27J.

TM 11-6665-209-40

Remove the batteries from the equipment before making any repairs.

3-3. DISASSEMBLY/ASSEMBLY PROCEDURES OF DETECTOR DT-196/PDR-27J.

Since the mica window is only 0.0005 inch thick, it is extremely

fragile. Do not touch the window under any circumstances, because

damage to the tube will result. Do not rely upon the guard ring to pro-

tect the mica window. The guard ring openings are large enough so

that sharp objects may pierce the window.

a. Removal of Latch Cover. (Figure 3-3)

(1) Remove screw (71), from slipring (72), and remove latch cover assembly (73

thru 76), and slipring (72), from detector assembly (8).

(2) Remove two screws (76), two Iockwashers (75) and remove latch cover (73)

from retaining clip (74).

b. Replacement of Latch Cover.

(1) Position latch cover (73) on retaining clip (74), and secure with hardware

removed in subparagraph a (2) above.

(2) Replace slipring (72) on detector assembly (8).

(3) Place latch cover (73) in slipring (72) and secure with hardware removed in

subparagraph a (1) above.

c. Removal of Electron Tube V202. (Figure 3-3)

(1) Remove retainer nut (60) from detector assembly (8), slowly remove wires from

inside detector assembly (8) and remove gasket (58).

(2) Using needle nosed pliers remove electrical cap (57) from electron tube V202

(77).

(3) Remove retainer nut (69) and guard (70) from detector assembly (8).

(4) Push electron tube V202 (77) from detector assembly (8) (approximately 1 in-

ches).

(5) Hold detector assembly in one hand and remove electron tube V202 from the

detector assembly (8).

3-8