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2
Table 6- 2 Operator Troubleshooting for MUM (cont.)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
5. Poor image
Check objective lens or
Refocus.
quality
eyepiece focus.
Check for fogging or dirt on
Clean lens surface. If image
lens.
quality is still poor, refer to
higher level of maintenance.
6. Light visible
Check eye-relief distance.
Readjust for proper eye-relief
around eyecup
distance.
Check eyecup for resiliency.
If eyecup is defective, refer to
higher level of maintenance.
7. Diopter
Check to see if the diopter
If damaged, refer to higher
adjustment cannot
adjustment ring is bent or
level of maintenance.
be made
broken
6-13