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SECTION SEVEN: Troubleshooting and servicing the 957 system
957 INSTALLATION MANUAL, Revision C1 Page 57
Table 11: Troubleshooting the 2201 installation
If . . . Then . . .
Satellite signals are often lost, or the 2201
works while you’re travelling in one
direction, but not the opposite one.
The 2201 may be partially shaded by metallic objects around it.
Re-position or raise the 2201 away from the object for a better
satellite view.
Signals may be lost when the 2201 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. For the correct antenna placement, see Figure 8
on page 19.
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 2201 from the 957, then measure the 7-pin 2201
connector for 10 - 36 volts at pin 7, ground at pin 6.
Check the 2201’s remote-on: Pin 5 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 2201’s view of the sky.
The almanac may not be complete; allow up to 30 minutes for full
initial acquisition.