User manual JRC JMA-2343

[. . . ] Thank you very much for purchasing the JRC marine radar equipment, JMA-2343 and JMA-2344. This equipment is a marine radar equipment designed to obtain safe operation of marine ships. The equipment consists of a radar signal transceiver unit, a CRT display unit and a scanner unit as its main units. Before operating the equipment, be sure to read this instruction manual carefully for correct operation. [. . . ] The waypoint mark, the bearing, distance and required travel time to the waypoint will disappear. In order to maintain the information that has been set, the battery (BT1) needs to be replaced at regular intervals. Please call the dealer servicing your locality for a replacement battery. (b) Reinitializing · The lithium battery maintains the content of the setting of the menu and soft key even when the power is shut off allowing use under the conditions of the last use. ⷠIf this battery runs down, all conditions including the menu will automatically be reset. For this reason, initializing is required after replacement of the battery. When the battery wears down, distance and bearing may become inaccurate. In the event immediate replacement of the battery is not feasible, initialization should be undertaken each time the power is turned on as an emergency measure. However, each time the power is shut off, the content that has been set is reset. In the event such phenomena as the screen becoming disturbed or the machine not accepting switch input occurs during use of the radar, initialize using the procedures outlined below. (b) Push the key, key and key key and key simulta- Power will be turned on as in normal operation for turning on power. This radar equipment has the following busses at the rear of the display unit. An external navigation device with either of these busses may be connected for input and output of information. In order to obtain information on the bearing of the ship, one of the following needs to be connected to the display unit. In order to obtain information on the speed of the ship, one of the following devices need to be connected to the display unit. In order to obtain information on the ship's position in terms of latitude and longitude, one of the following devices need to be connected to the display unit. LORAN C In order to obtain the ship's position information using LORAN C time difference, the following needs to be connected to the display unit. In order to obtain information on the L/L of the waypoint, one of the following devices need to be connected to the display and the waypoint set in such device. In order to obtain information on distance to the waypoint, one of the following devices need to be connected to the display unit, and it is necessary that the waypoint set in the navigation device is displayed on screen. LORAN C Information on distance is input from either the CMPS or NAVRX terminals. The maximum distance to a target that can be observed with a radar depends not only on the power of the radar's transmitter, beam width of the scanner unit, and the receiver's sensitivity but also on height of a target, distance to a target and height of scanner unit line etc. This is because the radio wave emitted by a radar runs straight, undergoing no influence by the curvature of the earth surface. [. . . ] Proper maintenance of the radar unit minimizes the possibility of machine failures. The maintenance operations that are common to all components of the radar unit are listed below. Cleaning Remove dirt, dust, or water-spray from the radar unit enclosure and keep it as clean as possible. Screw inspection Check the screws used to assemble and secure the components of the radar unit for loose connection. [. . . ]