EQ42/50/52 Installation and service Chapter 9
66
9.10 Troubleshooting
For all fault finding, first check that the supply voltage is between 10 – 32 V dc.
Symptom Check Remedy
No picture on display
screen.
Check that the unit is
turned on.
Press [PWR] key on keypad.
Check fuse in EQXX power
cable.
Replace fuse. Use only type
6A3F.
Picture appears on the
display screen, but image is
too dark or too bright.
Adjust the image as desired
by pressing the [PWR] key,
adjust light/contrast, and
press the [ENT] key.
Picture appears normal, but
no targets are shown or
only random “noise” is seen
Check that the correct
transducer is selected
Go to Echosounder setup
and select transducer type
Check that the transducer
connectors have been wired
properly.
If not properly wired,
rewire the connectors.
Check that the transducer
connectors are securely
mated with the console.
Correctly mate the
connectors to the console.
Check that the receiver gain
is set high enough.
Increase the receiver gain.
See Chapter 5.8 Presen-
tation setup.
Check that the range is
correct for the water depth.
Adjust the range. See
Chapter 5.8 Presentation
setup.
Check that the Demo mode
is not active.
Go to “Echosounder setup”
in Echosounder menu and
set Demo mode to OFF.
Excessive noise in echo
picture
Check for correct
grounding
Connected equipment
should be properly
grounded between it and
the echosounder.
No normal picture. Turn unit off and on again.
No response to key
operation.
Disconnect power and
connect again.
No normal picture or key
operation.
Return to factory presets,
refer to section 7.7.
All data is deleted after
turning the unit off and on.
Check battery lifetime,
which is 3-5 years.
Internal battery must be re-
placed by authorized dealer
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