ACTinBlack DTNVG, Operator'S Manual

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IR source In a dark location If IR source still fails to
fails to with system turned activate, refer to higher
activate. on, activate IR source. level of maintenance.
Visually check IR
source operation; scene
should brighten.
IR source Visual. Refer to higher level of
indicator maintenance.
fails to
activate.
Poor image Check objective lens Refocus.
quality. or eyepiece.
Check for fogging or Clean lens surface per
dirt on objective lens paragraph 4.5.
or eyepiece lens.
Check eye relief Readjust for proper eye
distance. relief distance.
Light visible
around
eyecup.
Check eyecup for
resiliency.
If eyecup is defective,
refer to higher level of
maintenance.
Dioptre Check to see if the If damaged, refer to higher
adjustment dioptre adjustment is level of maintenance.
cannot be bent or broken.
made.
Table 5-1 Troubleshooting, (cont.)