To Next PageTo Next PageWhy is there no audible alarm for SAR or distress messages on my JMC NT–2000?
Run the self-diagnostic tests and check the result of the alarm test. If issues persist, the CPU PCB may be faulty. Run the self-diagnostic tests and check the result of the RAM and ROM tests. If the result is “FAILED,” ask your dealer/qualified engineer to check the PCB by replacing.
Why my JMC NT–2000 Receiver receives no messages even during broadcasting time?
Check that the antenna cable is correctly plugged into the appropriate rear apron BNC connector receptacle. Also, verify that the connector (BNC) plug is properly installed onto the cable. Try replacing the active antenna. If the issue persists, check the voltage at the center conductor of each antenna connector. It should be 8V+ on the 490 and 518 kHz connectors and 12V+ on the 4209.5 kHz connector. If none of these steps work, have a qualified engineer check the connections to/from the CPU PCB and replace the PCB if needed.
Why does my JMC NT–2000 show error characters in messages during the daytime?
First, verify that you are within the service area covered by the ground wave of the desired station. Run the self-diagnostic tests and check the receiver test results. If the result is “FAILED,” have a qualified technician check the wiring or replace the receiver PCB. Check for any recently installed electronic devices near the receiver or antenna, and if found, turn off or relocate them. Unplug the antenna cable from the BNC connector on the rear apron and check the voltage at the center conductor. The preamplifier in the active antenna unit may be failing, or water may have entered the cable; try replacing the amplifier unit and/or the cable.
What to do if JMC NAVTEX Receiver turns on but the screen is blank?
Ensure that the power source voltage is within the 11–36V range. Repeatedly press the button to see if the normal brightness returns. The LCD module or the inverter PCB may be defective, so have a qualified technician check the connections and replace the module and/or the PCB. The CPU PCB may also be defective, so have a qualified engineer check the connections and replace the PCB if necessary.
Why JMC NT–2000 receives no messages with a good antenna and OK self-test?
This indicates that the antenna circuit is likely defective. If using an active antenna, replace it with one known to be good. If a correct replacement antenna is unavailable, use approximately 5 meters of insulated wire as a temporary long wire antenna, placing it as high as possible. If the problem persists, have a qualified engineer check the antenna coupler/selector circuit inside the rear apron for faulty or broken connections.
How to fix a JMC NT–2000 Receiver that cannot be turned on?
First, ensure the power cord is properly connected to the three-pin rear panel connector (POWER). Then, verify that the power cord is correctly connected to the ship’s DC power source with the correct polarity. Note that reversing the polarity will cause the 3A fuse to blow. Also, check the voltage of the power source, ensuring it is nominally 24 VDC. Inspect the fuse inside the rear panel fuse holder and replace it with a 3A, 5.2X20mm fuse if blown. If the fuse blows again, disconnect the active antenna cable from the rear panel connector to see if the issue persists. If it does not, the antenna amplifier or cable may have a short, requiring replacement. If the problem continues after replacing the antenna, the power supply PCB or DC/AC inverter PCB might be defective, and a qualified tec...
Why do some stored messages disappear from my JMC Receiver memory?
Put the “PROTECTED” tag to each desired message.
What to do if all messages disappear from JMC Receiver memory after power off?
Print out desired messages using an optional printer before switching the unit off for extended periods of time continuously.
Why is there no keypress beep on my JMC NT–2000?
Check if the keypress beep function is disabled. If it is enabled and you still hear no beep, ask your dealer/qualified engineer to check the related wiring to/from the keypress buzzer.
Why can't I control the screen brightness on my JMC NAVTEX Receiver?
Check to be sure that the power source voltage is within the 11–36V range. If the issue continues, the CPU PCB may be defective. A qualified engineer should check the wiring and replace the PCB if necessary.
Explains the NAVTEX message screen, on-screen indications, and illustrations.
Details receiver status indications, operating status line, and message ID format.
Describes alarm tags, new message tags, message scrolling, and message text display.
Explains end-of-message indication, storage status, CER, and prompt line.
Details indications for new message reception on first/second receivers and successful storage.
Explains control of screen brightness (BRT) and power (PWR) functions.
Details keypad backlighting control (DIM) and audible monitoring (MON).
Describes switching receiver pages (PAGE) and stopping alarms (STOP ALM).
Explains Up, Left keys for scrolling and menu navigation.
Details Enter (ENT) for selection, Down (DOWN) for scrolling, and SEL for station/message lists.
Explains the Right key for scrolling messages backward or menu navigation.
Describes the NEW MSG key for acknowledging new messages and removing the tag.
Details the REJ key to display lists of rejected stations and message types.
Explains the MENU key to open the SYSTEM MENU for customization and settings.
Describes STO MSG to protect messages and CLR to remove tags/close menus.
Provides an overview of basic operation without prior knowledge of NAVTEX.
Details the procedure for turning the equipment on and off using the PWR key.
Explains how to adjust screen (BRT) and keypad (DIM) brightness levels.
Explains how to switch between the first (518 kHz) and second (490/4209.5 kHz) receiver displays.
Describes line-by-line and message-by-message scrolling using arrow keys.
Explains how to silence audible alarms and remove visual alarm tags using the STOP ALM key.
Details the procedure to protect specific messages from automatic erasure using the STO MSG key.
Explains the steps to remove the protection tag from a stored message.
Explains menu system access and basic customization options.
Covers background colors, font types, and screen sleep mode settings.
Explains how to set times for automatic reduction of screen brightness.
Covers selecting second receiver frequencies and turning keypress beep on/off.
Details selecting/rejecting transmitters and message types.
Explains how to search stored messages by station ID or message type.
Covers selecting and outputting various NAVTEX messages.
Details setting output ports, protocols, bit formats, and data transfer rates.
Explains performing self-diagnostic tests and checking their results.
Covers turning message alarms on/off and resetting the system to factory defaults.
Provides an overview of common troubles and recommended remedies.
Lists symptoms and solutions for issues related to turning the equipment on.
Lists symptoms and solutions for problems with receiving NAVTEX messages.
Lists symptoms and solutions for issues with message storage and memory.
Lists symptoms and solutions for poor reception with many error characters.
Addresses blank screens and uncontrollable screen brightness.
Troubleshoots no keypress beep and no message alarm indication.
Addresses no response from keypress and no message alarm output.
Troubleshoots no external outputs and external control problems.
Provides instructions for cleaning the cabinet surface and filter.
Details annual maintenance for electrical contacts to prevent corrosion.
Outlines maintenance procedures for the antenna unit, including whip, housing, and cabling.
Lists recommended spare parts for maintenance and servicing.
Covers general precautions and requirements for installing the receiver cabinet.
Details the procedure for mounting the receiver cabinet using a tabletop bracket.
Covers installation site requirements for active and long wire antennas.
Provides precautions for routing cables to minimize interference and ensure safety.
Introduces making electrical connections via rear panel connectors and terminals.
Details pin assignments for power supply, ground terminal, and other connectors.
Explains data sentence formats for INS/IBS system communications via RS-422.
Explains commands to manipulate configuration masks for message reception.
Details the format of sentences output for reporting alarms or malfunctions.
Explains commands to externally acknowledge or stop current message alarms.
Lists proprietary commands for externally switching the second receiver frequency.
Provides a basic explanation of the NAVTEX system and its purpose.
Lists allocated frequencies and explains typical coverage areas for NAVTEX stations.
Describes methods used for error correction in NAVTEX transmissions to ensure reliable reception.
Provides a general overview of NAVTEX receiver functions and compliance with regulations.
Describes the specific features and capabilities of the NT-2000/DEBEG 2902 receiver.
Explains the operating principle, including PCB interconnections and receiver circuits.
Specifies equipment categories and supported receive frequencies.
Details receiver types, antenna input specifications, and input protection.
Describes active antennas and minimum values for message reception sensitivity.
Specifies demodulator type and details single and dual frequency reception modes.
Covers second receiver selection, time source, display resolution, and UI language.
Details text display format, message reception/storage indications, and scrolling.
Details message capacity, duration, protection, and storage without power.
Specifies message ID storage capacity and options for stored message outputs.
Lists external interfaces and details message alarm specifications.
Covers power requirements, cabinet dimensions, safe distances, and ambient temperatures.
Lists relevant IMO and IEC standards and a disclaimer on specification changes.
Details alarms for D-Type and A, B, L-Type messages, including conditions and interface.
Lists operational alarms like Storage Limit, Memory-Full, and Invalid Keypress.
Indicates that the last used screen and keypad brightness levels are stored.
Lists settings configurable via the menu system, including display, frequency, beep, and alarms.
Details user settings for selecting or rejecting stations and message types.
Covers settings for output ports and configuration for printing live messages.
General