: It starts the timer for the receiver to listen for echoes. Display Alignment
Contact JRC technical support (Tokyo or regional offices) with your radar model number and firmware version. They maintain service bulletins specific to "No Sync Signal" for each legacy model. Alternatively, consult a certified JRC marine electronics technician – and provide them with oscilloscope screenshots from your troubleshooting.
Troubleshooting "No Sync Signal" Errors on JRC Radar Systems
Frequently experience "dots" or "no signal" due to cable corrosion or failed magnetrons.
Switch the unit to and verify if the antenna rotates. no sync signal jrc radar
: Even if the motor rotates, a faulty encoder may fail to output the actual rotation (AZI) signal to the display. Wiring and Connectivity :
When this error appears, it typically points to one of the following hardware or communication failures: Scanner/Transceiver Issues
: It ensures that the "blips" you see on the screen are placed at the correct distance and angle. Safety and Regulations Operating without a functional radar can be a violation of SOLAS (Safety of Life at Sea)
Notifies the processor every time the antenna points directly dead ahead. : It starts the timer for the receiver to listen for echoes
Moisture intrusion inside the multi-pin plugs (often at the base of the mast or the back of the display unit) corrodes the sync line contacts. ⚡ Power Supply Fluctuations
A “no sync signal” fault on a JRC radar is most often a cabling issue or a scanner PCB trigger circuit failure . Always start with the cable – 60% of cases are solved there. If the antenna rotates freely but no sync, the trigger generator inside the scanner is the prime suspect.
Verify the or rotation signal output from the scanner.
The screen may be blank, show random noise, a frozen picture, or a “NO SYNC SIGNAL” alarm. : Even if the motor rotates, a faulty
An internal component failure on the modulator PCB inside the scanner, or the Signal Processing Unit (SPU) motherboard within the display console, can completely arrest signal processing. Step-by-Step Troubleshooting Protocol
If the pulse is present at the scanner but missing at the display unit, the interconnecting cable has an internal break. If there is no pulse output at the scanner board itself, the transceiver PCB requires repair or replacement. 4. Model-Specific Diagnostic Context JRC Radar Series Vulnerability Focus Common Field Solution JRC 1000 / 1500 / 1800
Radar transceivers use high-voltage components (Magnetron, Modulator). Only qualified marine electronics technicians should perform internal repairs. This guide focuses on troubleshooting external and configurable causes.