Version 1.5
175
Appendix F - Installation Section
Installation Manual
Troubleshooting Guide
The apMK12 is virtually maintenance free. There are, however, a few im-
portant points to note.
Please check your installation carefully before returning the apMK12 to
the dealer or factory for service. A few troubleshooting tips follow.
The apMK12 performs a variety of self tests during normal operation. If a
function fails the self test, the navigator displays an
Internal Error
mes-
sage every one minute.
Table 7. Troubleshooting Tips
Problem
Diagnosis
No response: (Black LCD display and no
traffic light)
No external power supply
Check supply voltage
Check for reverse polarity
Check wire installation
Check if external fuse is blown
No keyboard response or partial keyboard
response
Corrupted memory
faulty keyboard
faulty processor
Return the unit for repair
Battery low alarm
External battery low
Check power supply voltage and
installation
No position update; won’t track satellites
(Red traffic light blinking for more than 10
minutes)
Jamming by other on- board or adjacent
transmitters
Faulty antenna or antenna cable
Relocate GPS antenna
Replace antenna
Return the unit for repair
No position update; tracking satellites
(Red traffic light solid all the time)
DGPS mode set to
DGPS Only
and no
corrections are being received
GPS satellite signals weak (satellites
dropping in and out)
Check maximum cable length restrictions
and cable condition (for weak satellite
signal condition)
Return the unit for repair
All data lost at power up
Backup battery is dead
Replace the internal backup battery
No DGPS update; not tracking beacon
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 equipment
NMEA output data not configured
Wrong NMEA version
Wrong output rate, or format
Wrong electrical standard
Too many data sentences turned on
(throughput overflow)
More than one NMEA
talker
on the circuit
Faulty port
The MX420 requires the user to enable
NMEA
Return the unit for repair
8/13/01, 11:08 AM
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Содержание apMK12
Страница 1: ...Operation Installation Manual apMK12 Navigation System 8 13 01 11 42 AM 1...
Страница 13: ...viii Version 1 5 Operation Installation Manual Table of Contents 8 13 01 11 12 AM 8...
Страница 19: ...6 Version 1 5 Operation Installation Manual DGPS 8 13 01 11 30 AM 6...
Страница 93: ...80 Version 1 5 Operation Installation Manual Man Over Board 8 13 01 11 31 AM 80...
Страница 195: ...182 Version 1 5 Installation Manual Appendix G Technical Specifications 8 13 01 11 08 AM 182...
Страница 216: ...Place Stamp Here Leica Geosystems Inc 23868 Hawthorne Blvd Torrance CA 90505 USA 8 13 01 11 08 AM 204...