3
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: 02522800**
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
LOWt sHIGH
LOW HIGH
Figure 1-4 Tone and brilliance
setting display
2. Press t or s to adjust display tone.
3. Press ▲ or ▼ to adjust display brilliance.
Note: 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
Seven displays are available: normal (50 or
200 kHz), dual frequency, marker zoom, bot-
tom zoom, bottom lock, data, and graphic. (An
A-scope display is also available with the A-
SCOPE key.)
1. Press the MODE key.
▲
▼
t
SELECT SOUNDER MODE
MODE: SEL ESC: CLOSE
NORMAL
DUAL
MARKER ZOOM
BOTTOM ZOOM
BOTTOM LOCK
DATA
GRAPHIC
50kHz 200kHzs
Figure 1-5 Select sounder mode screen
2. Press the MODE key again to select a
sounder mode. You may also select a
sounder mode by pressing ▲ (upward)
or ▼ (downward).
3. Press the MENU ESC key to conclude
your selection.
Normal display
50 kHz
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