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5. MAINTENANCE, TROUBLESHOOTING
5-2
5.2 Fuse Replacement
A 5A fuse (type: FGBO-A 5A AC125V) in the power cable protects the equipment
against overcurrent, reverse polarity of the ship’s mains and internal fault. If the fuse
blows find the cause before replacing it. Contact your dealer about replacement. (A
7A fuse (type: FGMB 7A 125V) also is contained inside the display unit. Contact
your dealer about its replacement.)
CAUTION
Use the proper fuse.
Use of a wrong fuse can cause fire or
damage the equipment.
5.3 Troubleshooting
This section provides simple troubleshooting procedures which the user may
follow to restore normal operation.
Troubleshooting
If… Then…
there are no echoes but
the depth scale appears
• check if the transducer is properly connected.
there is no zero line or
zero line is not in correct
position
• check if the range shifted. (Zero line does not appear when
the range is shifted.)
• press the [-] key so as the scale starts from 0.
you suspect poor or low
sensitivity
• check that the [GAIN] control is properly set.
the bottom is traced in
zigzag pattern or you
experience occasional
loss of echo
• the sea may be rough. Bottom is traced zigzag when the sea
is rough.
• own boat may have passed over other boat’s wake, which
blocks propagation of sound wave.
there is no depth readout • check to see if bottom is present on the normal picture range.
• check if bottom echo is painted in red, reddish-brown.
automatic shift is
inoperative
• check if bottom echo is painted in red, reddish-brown.
noise appear
intermittently
• check if the cables of pulse generating equipment are near
the equipment.
there is noise and
interference
• check that GAIN and CLUTTER are properly adjusted.
• check the setting of the noise limiter.
• check the equipment’s ground.