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Page 3-8 400 SERIES MAINTENANCE MANUAL
Rev. C P/N 190-00140-05
Table 3-5. Static Messages
MESSAGE RECOMMENDED ACTION
Stored data was lost Replace Main Board (see paragraph 4.5.5)
Main processor requires service Replace Main Board (see paragraph 4.5.5)
Memory battery low Replace Memory Battery (see paragraph 4.7.1)
No differential GPS position Replace GPS Module (see paragraph 4.5.5)
VLOC remote transfer key stuck Replace NAV Receiver (see paragraph 4.5.6)
Display backlight failure Replace Inverter Board (see paragraph 4.5.4)
Replace Main Board (see paragraph 4.5.5)
COM push-to-talk key stuck Verify that Mic Key Line is not stuck before
replacing Com Board
Replace Com Board (see paragraph 4.5.4)
COM has failed Replace Com Board (see paragraph 4.5.4)
Replace Main Board (see paragraph 4.5.5)
COM needs service Replace Com Board (see paragraph 4.5.4)
COM transmitter power has been reduced Verify that power input to J2-11, 12 has not
dropped below 26 V when transmitting before
replacing COM Board
Replace Com Board (see paragraph 4.5.4)
GPS is not responding Replace Main Board (see paragraph 4.5.5)
G/S has failed Replace G/S Board (see paragraph 4.5.6)
Replace Main Board (see paragraph 4.5.5)
G/S needs service Replace G/S Board (see paragraph 4.5.6)
GPS stored data was lost Replace Main Board (see paragraph 4.5.5)
Check unit cooling Check Cooling Fan
No basemap data available Replace Map Board (see paragraph 4.5.5)
Replace Main Board (see paragraph 4.5.5)
Data card write failure Replace Interface Board (see paragraph 4.5.2.1)
Replace Flex Cable (see paragraph 4.5.2.1)
Replace Main Board (see paragraph 4.5.5)
Poor GPS coverage Check Antenna and Cabling
Replace GPS Module (see paragraph 4.5.5)
Altitude input failure Replace Main Board (see paragraph 4.5.5)