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SECTION SEVEN: Troubleshooting and servicing the 957 system
Page 58 957 INSTALLATION MANUAL, Revision C1
Table 12: Troubleshooting the 2701 and AN205-P installation
If . . . Then . . .
Satellite signals are often lost, or the
AN205-P works while you’re travelling in
one direction, but not the opposite one.
The antenna may be partially shaded by metallic objects around it.
Re-position or raise the antenna away from the object for a better
satellite view.
Signals may be lost when the antenna is under a bridge or when
shielded by buildings.
Poor SNR readings are obtained even
after running the 957 for several minutes
Check the quality of the antenna location—the antenna should have a
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
satellites
Check that WAAS is available in your operating area.
Reset the 957’s satellite elevation setting to its default (10 degrees).
Check that the 957’s
DIFFERENTIAL OPERATIONS
option is set to
either
WAAS
or
AUTO
.
The following error message appears on
the 957 display:
COMM FAIL
TOO FEW SATS
With power on, check the antenna and wiring connections.
Disconnect the 2701 from the 957, 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 press the
PWR
key to
turn the 957 off, then turn it back on again.
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.