Replacement of Parts - TM-11-6665-232-400020

11-6665-232-40

Correction

Item

Probable trouble

Symptom

tween 5 and 10 rad/hr

c. Defective function switch S2.

c. Check continuity of function

and then drop to 0

switch S2. Replace switch if

when function switch

defective.

is released after zero

d. Defective meter Ml.

d. Replace meter M1 if defective.

e. Defective detector assembly.

check.

e. Check resistance of detector

assembly (para 3-1). If trouble

persists, replace detector

assembly (fig. 3-2 or 3-3).

f. Defective calibration variable

f. Check resistance of cali-

bration variable resistor

resistor R4, or resistor R3,

R4 and resistors R3, R5,

R5, R6, or R?.

R6, and R7. Replace

resistors if defective.

g. Defective printed circuit

g. Check continuity of printed

wiring on printed circuit

board E15.

board E15. Replace print-

ed circuit board if de-

fective.

Pointer of meter Ml does not

a. Defective function switch S2.

a. Check continuity of function

indicate in CHECK band on

switch S2. Replace switch

meter scale; zero control R2/

if defective.

S1 is set to on, and function

b. Defective detector assembly.

b. Check resistance of detector

switch S2 is set to CHECK.

assembly (para 3-1). If

trouble persists, replace

detector assembly (fig.

3-2 or 3-3).

Meter MI does not respond

a. Defective function switch S2.

a. Check continuity of function

properly to radiation.

switch S2. Replace switch if

defective.

b. Calibration variable resistor

b. Send radiacmeter for calibration.

R4 improperly adjusted.

c. Check resistance of detector

c. Defective detector assembly.

assembly (para 3-1). If

trouble persists, replace

defector assembly.

NOTE

The following two items apply only to those radiacmeters that are equipped with an installment light.

Lamp DS1 (fig. 3-1) does not

Defective lamp switch or battery/

Replace instrument light (fig.

light when lamp switch is

3-1).

lamp clip ring.

pressed.

Lamp DS1 lights when lamp

a. Lamp switch bent . . . . . . . . . . . . . a. Straighten lamp switch.

switch is pressed but does

b. Lamp switch broken . . . . . . . . . . . b. Replace instrument light.

not go out when lamp switch

is released.

3-6. Replacement of Parts

The replacement part must be located in exactly

the same position as the part it replaced.

The parts of the radiacmeter can be reached and

b. If a part is replaced, the radiacmeter must

r e p l a c e d easily without special procedures. To

b e recalibrated.

r e a c h the parts of the radiacmeter, carefully

c. Do not disturb tile setting of calibration

r e m o v e the battery cover from the radiacmeter

variable resistor R4. Any movement of this con-

(TM 11-6665-232-12), unscrew the captive

trol will void the calibration of the radiacmeter.

screws in the cover assembly, and carefully re-

d. N e w m i c r o a m m e t e r s a r e s h i p p e d w i t h a

move the cover assembly. (Refer to the exploded

wire strap across the terminals. Be sure to re-

views of the radiacmeters (fig. 3-7 and 3-8) to aid.

move this strap before installing the new meter

in location of parts and parts replacement.) The

in the radiacmeter.

following precautions apply to the equipment:

a. Before removing a part from the radiacme-

NOTE

ter, note the position of the part and its leads.

The replacement of parts on the in-

3-8