Precautions 
xvi 
 
WARNING 
 
If equipment malfunctions, make sure to turn off the main power, open the circuit 
breaker, and please contact our head office, or a nearby branch or local office to 
request servicing. 
The continuous use of the equipment may cause a fire or electric shock. 
 
The recording control unit (NDV-1900) has a built-in battery. 
The battery needs to be replaced periodically. If using continually an expired 
battery, a fire may occur. 
 
Never replace the battery by yourself. 
Replacement by anyone other than qualified maintainers may cause a fire, an 
electric shock, or a malfunction. 
Please contact our head office, or a nearby branch or local office to request 
servicing. 
 
The recording control unit (NDV-1900) has a built-in battery. 
The battery contains dilute sulfuric acid. If the liquid that has leaked from the 
battery adhered with your clothes or skin, wash with clean water. If the liquid 
entered your eyes, immediately wash with clean water and see a doctor. 
 
The recording control unit (NDV-1900) has a built-in battery. 
Do not discard because used batteries are recycled. Please contact our head 
office, or a nearby branch or local office to request servicing. 
 
The underwater acoustic beacon of fixed protective capsule unit and float-free 
capsule unit has a built-in lithium battery. 
Do not discard because used lithium batteries are recycled. Please contact our 
head office, or a nearby branch or local office to request servicing. 
 
If disposing of this equipment, be sure to abide by applicable local laws and 
regulations.