Installation manual

Simrad MX500 | 189
Problem Diagnosis
All data lost at
power up
Backup battery is dead.
Replace the internal backup battery.
No DGPS update;
not tracking bea-
con station
DGPS mode set to Off, so no corrections
are being received.
Station Select is set to Manual.
Faulty antenna
No data output to
peripheral equip-
ment
NMEA output data not congured
Wrong NMEA version
Wrong output rate, or format
Wrong electrical standard
Too many data sentences turned on
(throughput overow)
More than one NMEA talker on the circuit
Faulty port
The MX420 requires the user to enable
NMEA
Return the unit for repair
Memory Backup Battery
The internal real time clock and memory which stores
the waypoints, alarm limits, etc., is backed up by a
lithium battery. The expected life time is 2 years at 21°
C, but this is based on the temperature the navigator is
stored at when not in use. The higher the temperature,
the shorter the life and vice versa.
Backup Battery Replacement
Marine electronics dealers or radio supply stores will
typically stock the replacement battery, Type TL-5902,
3.6 V (1/2 AA) Lithium battery.
The battery is mounted in a socket located on the MX500
processor board. SIMRAD recommends this service to be
done by a qualified service technician.