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JRC

JMA-610

The JRC JMA-610 is a compact X‑band marine radar designed for short‑range navigation, offering up to 24 nm detection and a 10.4‑inch display, optimized for river and canal operations.

4 kW / 24 NM

Capacity

Navigation Data / Sensor

Medium

Inspector Detail

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Common issues

Magnetron/transmitter output degradation over time, reducing detection range
Waveguide or rotary joint moisture ingress causing signal loss or arcing
Scanner unit motor/bearing wear causing rough or noisy antenna rotation
Display dimming, burn-in or backlight failure on the 10.4-inch unit
Scanner housing seal/gasket degradation letting water into the transmitter compartment
Heading line or EBL/VRM misalignment after gyro or installation changes
False/ghost echoes from trigger timing or receiver board faults

Inspection checklist

Check scanner unit housing and radome seals for water ingress
Verify transmitter output against baseline using the performance monitor if fitted
Listen/observe antenna rotation for abnormal noise or speed variation
Inspect waveguide/rotary joint (if accessible) for corrosion or moisture
Test all range scales and confirm target discrimination against known references
Verify heading line, EBL and VRM accuracy against actual bearings
Check display brightness/contrast and screen condition
Confirm interfaces to gyro, AIS and ECDIS are showing correctly on the radar
Test alarm functions (guard zone, target alarms)
Check power supply and breaker for the radar system

Service intervals

Scanner unit gasket/weatherproofing check	annually
Antenna rotation/motor check and lubrication per maker's manual	annually
Performance monitor check (if fitted)	annually
Display/console cleaning and ventilation check	every 6-12 months
Full functional test (ranges, alarms, interfaces)	before each SOLAS annual survey and per PMS

Critical spares

Magnetron or transmitter module matching this model - confirm exact part with JRC, do not substitute by guesswork
Scanner unit motor/gearbox or drive belt
Waveguide/rotary joint seals and gaskets
Display unit fuses and power supply fuses
Main processor/receiver PCB as a budgeted spare where held

Safety

Microwave radiation exposure in front of the scanner while transmitting - do not work in the beam path
High voltage inside the transmitter unit even after power-down (capacitor discharge)
Working aloft near the mast/scanner unit

Class survey

Radar is a SOLAS V mandatory item; class/flag verifies it is operational and interfaced correctly at annual and renewal surveys, but does not deep-test internal transmitter performance. Keep test/alarm function records in the PMS to support the survey.

Estimated lifetime: Magnetron-type transmitters commonly need replacement in roughly the low thousands of transmitting hours as a bauartüblich figure for this class of radar - treat as a rough planning guide only and confirm against the maker's own service data.