SECTION SEVEN: Troubleshooting and servicing the 958 system

TABLE 13: Troubleshooting the 2701 and AN205-P installation

If . . .

Then . . .

 

 

 

 

Satellite signals are often lost, or the

The antenna may be partially shaded by metallic objects around it.

AN205-P works while you’re travelling in

Re-position or raise the antenna away from the object for a better

one direction, but not the opposite one.

satellite view.

 

Signals may be lost when the antenna is under a bridge or when

 

shielded by buildings.

 

 

Poor SNR readings are obtained even

Check the quality of the antenna location— the antenna should have a

after running the 958 for several minutes

clear view of the sky.

 

Make sure the antenna is clean, and not covered with ice, snow, or

 

exhaust soot.

 

 

You’re having difficulty obtaining WAAS

Check that WAAS is available in your operating area.

satellites

 

 

Reset the 958’s satellite elevation setting to its default (10 degrees).

 

Check that the 958’s DIFFERENTIAL OPERATIONS option is set to

 

either WAAS or AUTO.

 

 

The following error message appears on

 

the 958 display:

 

COMM FAIL

With power on, check the antenna and wiring connections.

 

Disconnect the 2701 from the 958, then measure the 25-pin 2701

 

connector for 10 - 36 volts at pin 25, ground at pin 13.

 

Check the 2701’s remote-on: Pin 12 should measure less than 5

 

ohms to ground.

 

After testing above, re-connect the cable and turn the 958 off, then

 

turn it back on again.

TOO FEW SATS

Check if anything is blocking the 2701’s or antenna’s view of the sky.

 

The almanac may not be complete; allow up to 30 minutes for full

 

initial acquisition.

 

 

Page 38

958 Installation Manual, Rev. A1

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NorthStar Navigation 978/897-6600, 800/628-4487 installation manual Troubleshooting the 2701 and AN205-P installation
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978/897-6600, 800/628-4487 specifications

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