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5.6
Actions to Deal with Abnormalities and Breakdown
In the case of semiconductor circuits, except in cases of problems in the design or inspection of
such circuits or causes that are external or caused by humans, breakdown or deterioration of the
circuit does not often occur. In general, the causes of breakdown that are relatively frequently
found are wire cut in the high resistance device due to high humidity, defect in the variable
resistance and defective contact of switches and relays.
Moreover, in many cases the cause for breakdown is not a defect in parts but rather poor
adjustment (particularly inadequate tuning adjustment) or poor maintenance (particularly defect in
cable contact) and inspecting or readjusting these aspects is often effective in the case of
perceived abnormality or breakdown. The following table should be taken into consideration in
the case of abnormalities or breakdown.
There is always a cause for blown fuse and after replacing the fuse, it is necessary to
investigate the related circuits even when no abnormality remains. However, consideration
should be given to the fact that there is significant variance in the characteristics of fuse. Please
refer to the list on the fuses used given in Section 9.4.
No. Condition of the Breakdown
Conceivable Cause
1
Nothing appears on the
CRT.
a. Breakdown in the power supply unit (CBD-1596)
b. Fuse F1 has blown
c. Breakdown of the monitor
d. Breakdown of the main control circuit (CMC-1156)
e. The electric power of the ship is inadequate.
2 The scanner unit does not
rotate.
a. Fuse F2 has blown
b. Breakdown in the motor unit (JMA-2343: CML-645
H-7BDRD0023 inside the scanner unit, JMA-2344:
CBP-153)
c. Breakdown of the safety switch of the scanner unit
(JMA-2344 only)
3
The scanner unit rotates but
no radar image appears
(characters and markers
are, however, displayed).
a. Breakdown of the receiver (JMA-2343: CAE-457,
JMA2344: CAE-457-1)
b. Breakdown of the main control circuit (CMC-1156).
What is the condition of the transmission trigger (TI)?
c. Breakdown of the motor unit (JMA-2343: CML-645
H-7BDRD0023 inside the scanner unit, JMA-2344:
CBP-153)
4 The operation switches do
not work.
a. If the switches do not work even after turning the power on
again, breakdown in the main control circuit (CMC-1156).
b. Breakdown in the main operation panel circuit
(CCK-873) or soft key panel circuit (CCK-872)
c. Cut in the cable connecting the operation unit.
Содержание JMA-2343
Страница 1: ...船舶用レーダ装置 JMA 2343 2344 MARINE RADAR EQUIPMENT 取扱説明書 INSTRUCTION MANUAL ...
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Страница 17: ...J JM MA A 2 23 34 43 3 2 23 34 44 4 取 取扱 扱説 説明 明書 書 日本語版 ...
Страница 30: ...14 1 4 構造 第 1 1 図 NKE 249 空中線外形図 ...
Страница 31: ...15 第 1 2 図 NKE 250 空中線外形図 ...
Страница 32: ...16 第 1 3 図 NCD 4170 指示機外形図 ...
Страница 115: ...99 9 2 3 装備ケーブルの接続 1 レドーム型空中線 NKE 249 ...
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Страница 117: ...101 2 回転型空中線 NKE 250 ...
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Страница 151: ...J JM MA A 2 23 34 43 3 2 23 34 44 4 I IN NS ST TR RU UC CT TI IO ON N M MA AN NU UA AL L English edition ...
Страница 163: ...147 1 4 Configuration Fig 1 1 OUTLINE DRAWING OF SCANNER UNIT NKE 249 ...
Страница 164: ...148 Fig 1 2 OUTLINE DRAWING OF SCANNER UNIT NKE 250 ...
Страница 165: ...149 Fig 1 3 OUTLINE DRAWING OF DISPLAY UNIT NCD 4170 ...
Страница 249: ...233 9 2 3 Connection of cables to be assembled 1 Radome scanner unit NKE 249 ...
Страница 250: ...234 ...
Страница 251: ...235 2 Rotary scanner unit NKE 250 ...
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Страница 308: ... 図 118 指示機回路ブロック図 Fig 118 BLOCK DIAGRAM OF DISPLAY UNIT ...
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