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1.3 Turning On/Off the Power
Press the POWER key to turn the power on/
off. When the unit is turned on it proceeds in
the sequence shown below.
Sounder
display
ROM and RAM
check; displayed for
several seconds.
** Program version
no.
ROM: OK
RAM: OK
PROGRAM No: 02522790**
200k
0
20
40
60
80
49.6
0.0
You may press any key to show
the sounder display immediately.
Figure 1-3 Start-up sequence
Note: Wait at least five sec. before reapply-
ing the power.
1.4 Adjusting Tone and Brilliance
1. Press the BRILL key. The tone and bril-
liance setting display appears.
TONE : 5
BRILL : 7
LOW– +HIGH
LOW
▼ ▲HIGH
Figure 1-4 Tone and brilliance
setting display
2. Press the [+] or [–] key to adjust display
tone.
3. Press the [▲] or [▼] key to adjust dis-
play brilliance.
Note 1: Location of arrow keys on the bril-
liance setting is opposite of same controls on
the control panel.
Note 2: Tone or brilliance must be adjusted
within about 10 seconds after pressing the
BRILL key or the tone and brilliance display
will be erased.
1.5 Selecting a Display
Six basic displays are available: nav (data or
graphic mode selectable on the system menu),
low frequency, dual frequency, high fre-
quency, zoom (marker zoom, bottom zoom,
bottom lock), and menu. (An A-scope display
is also available with the BRILL and ALARM
keys.)
1. Operate the MODE control to select a dis-
play mode.
2. For zoom mode, press the ZOOM key.
ZOOM MODE
▲
▼
BOTTOM LOCK
BOTTOM ZOOM
MARKER ZOOM
Figure 1-5 Zoom mode selection display
Normal display
Low frequency (50 kHz) display
The sounder uses ultrasonic pulses to detect
bottom conditions. The lower the frequency
of the pulse, the wider the detection area.
Therefore, the 50 kHz frequency is useful for
general detection and judging bottom condi-
tion.
50 kHz
200 kHz
Figure 1-6 Comparison of detection ranges
of 50 kHz and 200 kHz transducers