EQ44/54 Installation and service Chapter 11-21
11.9 Troubles hooting
For all fault finding, first check that the supply voltage is between 10-32 VDC
Symptom Check Remedy
No picture on display
screen
Check that the unit is
turned on
Press the [PWR] key on
keypad
Check fuse in power cable
fuse holder
Replace fuse. Use only
type T6.3A slow (5x20mm)
Picture appears on the
display screen, but image
is too dark or too bright
Press [PWR], adjust light
and press [ENT]
No normal picture or key
operation
Turn unit off and on again
Disconnect power and
connect power again
Return to factory presets,
see section 10.6
Echo picture appears
normal, but no target are
shown or only random
“noise” is seen
Check that the correct
transducer frequency is
selected
Change frequency from
Echo quick menu, press
[ENT], [1] - see section
4.5
Check that the transducer
connectors are securely
mated with the unit
Correctly mate the con-
nectors to the unit
Check that the receiver
gain is set high enough
Increase the receiver gain
in 4.7 Presentation setup
Check that the range is
correct for the water depth
Adjust the range in 4.7
Presentation setup
Excessive noise in echo
picture
Check for correct ground-
ing
Connected equip-
ment must be properly
grounded to the main unit
All data is deleted after
turning off the unit and
turning it back on
Check battery lifetime.
Expected lifetime is min.
5 years
Internal battery must be
replaced by authorized
dealer
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