Furuno CH-250 Operator's Manual page 109

TRAIN shows a figure between 355-359 if normal. NG appears in case of train error.
TEST COUNT shows the number of times the test has been consecutively executed.
At the bottom of the screen there are two major groups of zeroes (0), and they represent the
keys and controls on the control panel and remote controller. Press a key and its on-screen
location shows "1" while the key is pressed and "0" when it is released. Operate a control
and its on-screen location changes as below. When the [GAIN] control is operated the panel
dimmer increases or decreases with adjustment of the control.
GAIN control: Shows 0-127.
Other controls: Shows 0-19.
To quit the test, press the [MENU] key three times.
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