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190-00067-25 Rev D 3-7
Table 3-2. Troubleshooting Chart Con’t.
PROBLEM ACTION
GPS reception weak or GPS Status Page
shows low signal levels
Replace Antenna and/or antenna cable
Replace GPS Receiver Board (see section 4.3.6)
No GPS reception Check Date/Time Page for correct UTC time
1
Check Position Page for close approximate starting
position (within 300 nautical miles)
2
Replace Antenna and/or antenna cable
Replace GPS Receiver Board (see section 4.3.6)
Replace CPU Board (see section 4.3.5)
Unit displays velocity when not moving
3
Replace GPS Receiver Board (see section 4.3.6)
NiCad Battery life is short
(Optional Remote Battery)
Replace External Battery Pack (see section 4.3.10)
Replace CPU Board (see section 4.3.5)
Unit loses memory in spite of new memory
battery
Replace CPU Board (see section 4.3.5)
Unit does not detect low memory battery Replace CPU Board (see section 4.3.5)
Unit does not detect external power
4
Check external power connection
Replace CPU Board (see section 4.3.5)
No serial data output Replace CPU Board (see section 4.3.5)
No external CDI output or external CDI
functions improperly
Check connections and verify operation in Test
Mode
Replace CPU Board (see section 4.3.5)
Unit detects low NiCad battery too soon or
too late
Adjust battery alarm setpoint from config.page
3.5.1 Table Notes
1
If UTC time is incorrect, unit may be reset by holding the CLR key down while turning the unit on. The unit must then be
attached to an antenna, allowed to search the sky and collect new almanac data. This process may take 5-10 minutes.
CAUTION: All user waypoints/settings will be lost if the unit is reset, save to User Data Card.
2
The GPS 155XL will eventually perform an AutoLocate
and lock onto satellites. However, this can add an additional 10
minutes to the normal lock-on time.
3
Low velocity numbers can display even though you’re not moving when the unit is in 3D mode and should not be
considered a problem. However, this should seldom occur in 2D mode.
4
The ‘Turning Off’ message appears at/below approximately 9 VDC external power.