B&G HS2000 - Manual (Page 80)

HS 2000 User Manual
Part 6 - Diagnostic Data
HB-0846-03
6-7
All of these symptoms can be caused by external conditions, so
care and additional tests should be performed before concluding
that the fault lies with the Depth Sounder. Two Depth Sounder
parameters which can assist in diagnosing faults are
measurements of receiver gain and noise; these can be found in
the PARAMTR Menu on any FFD.
6.2.1 Boat Stationary
Symptom: Display consistently shows:
-
- -
-
when comfortably within the range of the Depth Sounder when the
boat is stationary in the water; this indicates that no consistent
signal is being received by the Depth Sounder.
Possible causes:
(a) The transducer is not connected.
(b) The transducer is not stowed in the housing.
(c) If sounding through the hull, there is not enough oil in
the housing, or the hull material is unsuitable for
conduction of sound.
(d) The transducer is faulty or has been damaged. The
transducer should be checked for any damage, barnacle
growth or thick layers of paint. If the transducer requires
cleaning, a scrubbing brush should be used. The face of
the transducer may have a thin coat of anti-fouling
applied, ensuring that no air bubbles are trapped in the
paint. The cable should be checked for damage; the
resistance between the two orange wires should be in the
range 0.5 to 5 Ohms, and resistance between the screen
and the cores should be infinity. Resistance
measurements should only be made with the transducer
disconnected from the Processor Unit.
(e) The gain of the receiver has been set too low. It is
possible to adjust the maximum gain via CAL VAL1 on
gain; this is normally set to 30 and should not be
adjusted.