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Chapter 6: Maintenance & Fault Finding 6-3

6.3 Problem solving

Prior to packing and shipping, all Raytheon products are subjected to

comprehensive test and quality assurance programmes. However, if this unit

should develop a fault, please refer to the following table to identify the most

likely cause and the corrective action required to restore normal operation.

If you still have a problem after referring to the table, contact your local dealer,

national distributor or Raytheon Product Support for further advice.

Always quote the product serial number.

Fault finding

ProblemProblem

Problem

CorrectionCorrection

Correction

Unit does not function 1. Make sure that the power supply cable is sound and that all

connections are tight and free from corrosion.

2. Check polarity of the dc power cables for proper connection.

Reconnect leads if necessary.

3. Check in-line fuse. Replace if necessary.

4. Check vessel’s power (battery) for correct voltage readings

(10.0Vdc to 18.0Vdc)

Poor display definition Adjust contrast setting and/or backlight level

No position information Check the GPSconnection

Check the GPSreceiver/antenna

No fix Check that GPS receiver not obstructed

No dfix (RC420 only) Check beacon station coverage

Check antenna ground (see GPS antenna Installation Guide)

No NMEA data received Check the POWER/NMEA connector and the NMEA equipment

Loss of stored data, Return to dealer for internal battery chack

eg. waypoints

No detailed chart data Check that Nav-Chart card is pushed fully home

Check that the Nav-Chart card has appropriate cartography

Raymarine Chartplotter User Manual

Questions and Answers: