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The JRC CMC-1218A is a display control printed circuit board (PCB) used inside marine radar systems made by Japan Radio Co., Ltd. (JRC). It’s a specialized electronics board that handles the display control functions of the radar unit — basically the logic and signal connections that take processed radar data and manage how it gets shown on the radar screen.
Display Control Circuit: This board is designated as the display control module for JRC radar models such as those in the JMA-9900 series (e.g., JMA-9922/9923).
Interface Between Systems: It receives data from the radar’s signal processor and coordinates the display output — ensuring the radar image and navigation information are accurately rendered.
📍 System Integration
Designed specifically for JMA‑9900 series marine radars — it sits in the display unit along with other circuits such as power supply, panel circuits, mother board, and signal processing boards.
Works as the display control circuit for rendering radar data and user interface elements on the radar screen.
📍 Electrical & Environmental Compatibility
Operates within the radar’s built‑in power supply and environmental specifications (e.g., 12–24 V DC or AC depending on system conversion, wide‑temperature marine‑rated design). Specific board voltage/current isn’t separately published, but it follows the host display’s requirements.
Marine‑environment compliance typical for JRC radar PCBs (vibration, humidity tolerance, corrosion‑resistant materials).
Interfaces with other radar modules (e.g., signal processor, panel circuits).
Likely connects through JRC proprietary connector and bus systems inside display chassis.
Works alongside CDC‑1209 signal processing PCB and other panel boards (CCK‑900‑902) to generate the complete display output.
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