To Next PageTo Next PageWhy is there no audible alarm for SAR or distress messages on my JMC DEBEG 2902 Receiver?
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 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 DEBEG 2902 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 Receiver 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 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 DEBEG 2902 memory?
Put the “PROTECTED” tag to each desired message.
What to do if all messages disappear from JMC DEBEG 2902 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 Receiver?
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.
Warns about high voltages inside the equipment cabinet.
Cautions against water intrusion and improper installation environments.
Addresses damage from installation errors and limits liability.
Shows the layout of the control panel and key functions.
Explains the BRT and PWR keys for display and power control.
Explains the DIM and MON keys for backlighting and audio monitoring.
Details the UP, LEFT, ENTER, DOWN, and PAGE keys.
Guides users through basic operation without prior knowledge.
Details the procedure for powering the unit on and off safely.
Covers adjusting screen brightness and keypad backlighting.
Explains how to switch between the two NAVTEX receivers.
Provides general advice and information for troubleshooting.
Addresses issues when the equipment fails to turn on.
Covers common problems with receiving NAVTEX messages.
Addresses issues related to message storage and memory.
General