JMA-9933-SA (S-band); JMA-9923-7XA (X-band, radar mast); JMA-9922-6XA (X-band, foremast)

Radar display is too dim or too bright.

Adjust the [BRILL] dial on the lower right of the monitor unit. Turn clockwise to increase brilliance, counter-clockwise to decrease it. Set the brilliance to a level that allows clear observation without glare, considering ambient light conditions.

Radar range is too narrow or too wide for observation.

Press the [RANGE+] key to increase the observation range for a wider view. Press the [RANGE-] key to decrease the observation range for a narrower view, which is better for observing the vicinity of your own ship.

Radar targets are unclear due to noise on the display.

Adjust the [GAIN] dial. Turn clockwise to increase receiving gain and widen the observable radar video range. Turn counter-clockwise to decrease gain, which can help clarify densely crowded or short-range targets.

Sea clutter is obscuring targets on the radar display.

Turn the [SEA] dial to adjust sea clutter suppression. Turning it clockwise increases suppression, while turning it counter-clockwise intensifies sea clutter returns. Be cautious not to over-suppress, as this may hide small targets.

Automatic sea clutter suppression is active, but fine adjustments are needed.

Even in automatic sea clutter suppression mode, fine adjustments can be made by turning the [SEA] dial.

Rain or snow clutter is obscuring targets on the radar display.

Turn the [RAIN] dial to adjust rain/snow clutter suppression. Turning it clockwise increases suppression, making targets hidden by clutter more visible. Turning it counter-clockwise intensifies rain/snow clutter returns. For optimal suppression, use the [RAIN] dial in conjunction with the [SEA] dial.

Automatic rain/snow clutter suppression is active, but fine adjustments are needed.

Even in automatic rain/snow clutter suppression mode, fine adjustments can be made by turning the [RAIN] dial and the [SEA] dial.

Audible alarm is sounding.

Press the [ALARM ACK] key to acknowledge the alarm. This will stop the buzzer sound and the alarm lamp flashing. If multiple alarms are active, press the key for each alarm indication.

Radar display shows interference from other radars.

Left-click the IR button on the lower left of the radar display to cycle through interference rejection modes. Select an appropriate level, but be aware that high rejection levels may reduce the ability to detect small targets.

Radar transmission pulse length needs adjustment.

Press the [GAIN] dial to cycle through different transmission pulse widths. Select a pulse width appropriate for the observation range and antenna type.

Radar display azimuth mode needs to be changed.

Left-click the AZI Mode button on the lower left of the display to switch between Head Up, North Up, and Course Up display modes.

Radar motion display mode needs to be changed.

Left-click the motion mode button on the upper left of the radar display to switch between True Motion (TM) and Relative Motion (RM) modes.

Own ship's position needs to be reset to the center in True Motion mode.

Hold down the motion mode button for 2 seconds. This will reset the own ship to its initial position as established when switching to True Motion mode.

Own ship's display position needs to be moved off-center.

Left-click the Off Center button on the upper left of the display. Use the trackball to move the cross cursor mark to the desired new center position, then press the left trackball button to fix it.

Own ship's display position needs to be returned to the center.

Hold down the Off Center button for 2 seconds. This will return the own ship's position to the center of the display.

Radar trails display time needs to be changed.

Left-click the Radar trails display time button on the upper left of the display to cycle through different trail lengths. Options include various seconds and minutes intervals.

Radar trails data needs to be erased.

Hold down the Trails button on the upper right of the display for five seconds. This will erase all saved trails data.

Radar trails motion mode needs to be changed.

Click the Trails Mode button on the upper right of the radar display to switch between true and relative trails motion modes.

Radar video needs to be zoomed in.

Left-click the x2 button on the lower left of the display. Then, place the cross cursor mark on the desired zoom-in location and press the left trackball button.

Radar zoom mode needs to be cancelled.

Left-click the x2 button on the lower left of the display. This will cancel the zoom mode and return to a normal display.

Graphics information is cluttering the radar display.

Press the [DATA OFF] key, or left-click the Data Off button on the lower right of the display. This will temporarily hide graphics data other than VRM, EBL, HL, cursor, and range rings.

Ship's heading line needs to be hidden.

Press the [HL OFF] key, or left-click the HL Off button on the lower right of the display. The heading line will be hidden while the key is held down, allowing clearer observation of targets on the heading line.

Day/Night display mode needs to be changed.

Press the [DAY/NIGHT] key, or left-click the Day/Night button on the lower right of the display. This will cycle through different display color and brightness combinations.

Operation panel brilliance needs adjustment.

Press the [PANEL] key, or left-click the Panel button on the lower right of the display. The brilliance of the operation panel's lighting will change cyclically.

True bearing value does not match master gyro.

Open the Serviceman Menu, then navigate to 6.NAV Equipment Setting -> 1. Gyro Setting. Enter the value indicated by the master gyro on the numeric input screen to adjust the radar's true bearing value.