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|  MIL-T-45379D(AT)
pulse-forming network. The test cable must be removed at the conclusion of LRF tests and the
LRF systems returned to its original condition. Since laser beam damage to the human eye is
irreparable and may cause blindness, the following precautions are mandatory when the LRF is
not disabled:
CAUTION:
1. EXERCISE PARTICULAR CARE WHEN THE RANGE SWITCH IS FLASHING
IN EITHER THE "ON" OR "AUTO" MODE. THE LRF IS ARMED AND READY
TO FIRE A PULSE OF LASER LIGHT UNDER THESE CONDITIONS.
2. DO NOT DEPRESS THE RANGE SWITCH WHEN IN EITHER THE" ON" OR
"AUTO" MODE WITH THE RANGE SWITCH FLASHING.
3. DO NOT DEPRESS THE GUNNER'S LASER SWITCH WHEN IN EITHER THE
"ON" OR "AUTO" MODE.
4.6.4.9.5.2.1 LRF system power turn on. To determine conformance to 3.5.9.5.2.1, the
XM21 ballistics computer power switch shall be activated to the ON position and the system
shall be observed for operation as specified.
4.6.4.9.5.2.2 Mode control switch. To determine conformance to 3.5.9.5.2.2, the mode
control switch shall be rotated to the positions specified as the corresponding control lamps are
observed for proper illumination.
4.6.4.9.5.2.3 RANGE switch. To determine conformance to 3.5.9.5.2.3, the range switch
shall be actuated and the LRF shall be observed for proper ranging operations as specified.
4.6.4.9.5.2.4 RESET switch. To determine conformance to 3.5.9.5.2.4, the reset switch shall
be activated as the specified indications are observed for occurrence.
4.6.4.9.5.2.5 Range return selector switches. To determine conformance to 3.5.9.5.2.5,
during ranging operation test, the LRF shall be observed for proper operation as specified.
4.6.4.9.5.2.6 Remote range reset switch. To determine conformance to 3.5.9.5.2.6, the
remote range reset switch shall be actuated and the system be observed for operation as
specified.
4.6.4.9.5.2.7 Malfunction light. To determine conformance to 3.5.9.5.2.7, during ranging
operation tests, the malfunction light and range display lights shall be observed for proper
operation as specified.
4.6.4.9.5.2.8 GO light. To determine conformance to 3.5.9.5.2.8, the GO light and the
specified switch buttons shall be observed for proper operation during ranging operation tests.
4.6.4.9.5.2.9 SELECT light. To determine conformance to 3.5.9.5.2.9, the SELECT light
shall be observed for proper operation as specified during ranging operation lights.
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