Table 6.1 Preventive Maintenance Checks and Services for ATN NVM-14 (cont.)
Item | Interval | Location Item to | Procedure | Not Fully Mission | |
No. |
| Check/Service |
| Capable If | |
|
|
| Check to make sure battery adapter | Adapter is missing, | |
|
|
| is present. Remove battery adapter | ||
|
| Battery Adapter / | contacts damaged or | ||
4. | Before/After | Compartment | and inspect for corrosion, moisture, | corroded, or | |
|
|
| corroded or defective contacts, and that | missing. | |
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|
| ||
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|
| |
|
| Diopter Adjust- | Rotate diopter adjustment ring to make | Binding, not moving | |
5. | Before/After | ment Ring | sure the eyepiece is not too tight or too | freely or too loose. | |
|
|
| loose. Range is approximately ½ turn. |
| |
|
|
| Inspect for dirt, dust, and cracked or torn |
| |
6. | Before/After | Eyecup | cup. Inspect for bent, broken or improp- |
| |
erly fitting eyecup. If necessary, clean |
| ||||
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| ||
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| with water. |
| |
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| |
|
| Objective Lens | Rotate objective lens focus knob | Binding or not moving | |
7. | Before/After | to ensure free movement (range is | |||
Focus Knob | freely. | ||||
|
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| approx. 1/3 turn |
| |
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|
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|
| |
8. | Before/After | Lens Cap | Inspect for cracked, torn, or missing |
| |
lens cap. |
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| ||
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| |
|
|
| Turn switch OFF to ON. Each position | Switch has no definite | |
9. | Before/After | On/Off Switch | should have a definite stopping point. | stopping points or knob | |
|
|
| Inspect for broken or missing knob. | is broken or missing. | |
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