Problem | Check point and probable | Remedy | ||
| cause |
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| |
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| |
Interference rejector | 1. SPU Board | 1. | Replace SPU Board. | |
inoperable |
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|
(interference rejection |
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|
level not displayed) |
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| |
Echo Stretch | 1. SPU Board | 1. | Replace SPU Board. | |
ineffective (Neither |
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|
"ES1" nor "ES2" is |
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|
displayed.) |
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Only 2 parallel index | 1. | Incorrect setting of index line | 1. | Set index line interval referring to |
lines (6 lines wanted) |
| interval |
| paragraph 1.18. |
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|
Range rings are not | 1. | Press RINGS (PUSH) | 1. | Replace associated circuit board if |
displayed. |
| control to see if intensity is |
| unsuccessful. |
|
| increased. | 2. | Replace control. |
| 2. | Bad contact of control | 3. | Replace SPU Board. |
| 3. | SPU Board |
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| |
Key beep inaudible | 1. SPU Board | 1. | Replace SPU Board. | |
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|
Poor discrimination at | 1. | Sea clutter control not | 1. | Improper setting of A/C SEA effect |
range |
| functioning properly. |
| is seen only at very close range. |
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|
| Suspect inaccurate frequency of |
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|
| crystal oscillator. |
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|
True Motion | 1. | Poor contact of MODE key. | 1. | Try to press MODE key a little |
presentation not | 2. | Selection is not accessed. |
| harder. |
working correctly | 3. | Speed entry is incorrect. | 2. | Press MODE key until "TM" |
| 4. | TM display inaccurate |
| appears. |
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|
| 3. | Enter correct own ship speed |
|
|
|
| referring to paragraph 1.23. |
|
|
| 4. | Make sure that speed and compass |
|
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|
| inputs are accurate. |
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| |
Target not tracked | 1. Poor definition of targets in | 1. | Adjust A/C SEA and A/C RAIN | |
correctly |
| sea clutter |
| controls referring to paragraphs |
|
|
|
| 1.11 and 1.12. |
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4 – 4
