91User Manual
15.4 TROUBLESHOOTING
The following is a brief guide to some of the problems you may experience
while using the EKP-IV with common solutions.
15.4.1 POWER
No Power — The power connections are loose or not fully engaged. Make sure
all Power Cable connections are secure. Make sure the power supply is operat-
ing properly. Check the fuse located at the end of the cigarette plug. (To open
unscrew the middle circle at the tip of the adaptor.)
15.4.2 GPS FIX
Position fix doesn’t change — The signal from one or more satellites has been
lost; the positioning information displayed is the most recent available.
Position fixes vary a lot — GPS accuracy is affected by several variables, the
most prevalent of which are the geometric quality of the fix. Therefore, the
specified accuracy of 15 Meters RMS in 2D is statistical, not absolute and as-
sumes the absence of Selective Availability which was discontinued in April
2000.
The EKP-IV is not obtaining position fixes — If the EKP-IV is using an
internal GPS Receiver, proceed to the GPS status screen:
>‘MENU’ 1 sec. + “GPS PAGE” + ‘ENTER’
Review the number of satellites in use. If zero, check that the antenna has a
clear view of the sky and that the connections have been made properly. If less
than four satellites are in use, the GPS receiver may have difficulty receiving a
fix. Try repositioning the antenna. A GPS fix requires a minimum of three
satellites and a poor Signal Quality on one or more satellites may preclude
receiving a position fix.
Verify the user setting for Fix Source is listed as Internal GPS:
> ‘MENU’ 1 sec. + “SYSTEM SETUP” + ‘ENTER’ + “FIX SETUP” + ‘ENTER’ + “FIX SOURCE” +
‘ENTER’ + “INTERNAL GPS” + ‘ENTER’
If the EKP-IV is using an External GPS receiver, proceed to Fix functions screen:
> ‘MENU’ 1 sec. + “SYSTEM SETUP” + ‘ENTER’ + “FIX SETUP” + ‘ENTER’
Verify that the Fix Source is listed properly (External NMEA) as indicated in
the System Setup section (see Chapter 14) and that the Baud Rate is set cor-
rectly for your GPS receiver (the EKP-IV requires 9600- Baud Rate). Verify
that the data cable connections are proper.
External device is not responding — The data port is not turned on or is not
outputting messages in the correct format. Refer to the external device’s user
guide to determine the correct message format. Check the Installation Settings
menu and make any necessary changes.
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