Raymarine Autohelm ST6000, Service Manual

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SeaTalk Service Manual 3
Fluxgate Compass Transducer (Z130)
1. Description
The Z130 Fluxgate Compass Transducer contains a precision Fluxgate sensor. This
can be replaced by following the procedures in Section 5.
Some early models (pre Serial No 600001 were susceptible to damage in transit
(fluxgate sensor springing free from gimbal assembly). If received for service these
units should be modified using the gimbal support bracket (see section 4).
2. Functional Test
Disconnect the Fluxgate from the autopilot and check continuity as follows:-
Cable Colour Connector pin no Resistance
Screen to Blue 2/4 < 10 ohms
Red to Green 3/5 < 5 ohms
Red to Yellow 3/6 < 5 ohms
Red to Screen 3/2 Open circuit
3. Magnetic Deviation
The Z130 Fluxgate Compass requires careful siting if optimum autopilot performance
is to be achieved. The SeaTalk Course Computers are able to correct the compass
for any deviating magnetic fields present when the linearisation procedure is carried
out. Any further deviation, introduced after linearisation, will introduce an error be-
tween the Fluxgate and the ships compass. This can be removed by carrying out the
linearisation procedure again. If the displayed deviation is greater than +/-15 degrees
the Fluxgate should be re-sited.
Note:
The linearisation procedure should always be carried out if the fluxgate has been
exchanged, removed or moved from its original mounting position.