TM-9-1040-267-20-P
LAUNCHER, GRENADE, SMOKE: SCREENING, RP, M243; RP, M257; RP, M259
TECHNICAL MANUAL; ORGANIZATIONAL MAINTENANCE MANUAL (INCLUDING REPAIR PARTS AND SPECIAL TOOLS LIST)
FEBRUARY 1984
TM-9-1040-267-20-P - Page 27 of 108
INDICATOR LIGHT
3.
INDICATOR LIGHT WON’T LIGHT
NOTE
Do not let probe prod touch electrical receptacle connector shell. This will cause
wrong meter reading.
Insure good contact by multimeter probe prod on test point. Poor contact will cause
false meter reading.
Check key on electrical receptacle connector to locate position of pins A through F.
Step 1. Set range switch to RX1 and zero multimeter. Move toggle switch lever
(1) to ARM. Touch red probe prod on pin A and black probe prod on pin D
of electrical receptacle connector (2).
a. If meter reads any other reading than infinity (z) on OHMS
scale, lamp resistance in indicator light assembly (3) is good.
None. Indicator light is good.
b. If meter reads infinity(x) on OHMS scale, lamp is burned out or
arming firing unit is faulty.
Replace lamp. Remove and install (p 2-49). Then go to
step 2.
Step 2.
With range switch on RX1, zero multimeter. With toggle switch lever (1)
on ARM, touch red probe prod on pin A and black probe prod on pin D of
electrical receptacle connector (2).
a. If meter reads any other reading other than infinity (z) on
OHMS scale, lamp resistance in indicator light assembly (3) is
good.
None. Indicator light is good.
b. If meter continues to read infinity (z) on OHMS scale, arming
firing unit is faulty.
Remove new lamp and replace arming firing unit.
2-13
TM 9-1040-267-20&P
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