Garmin GNC 250 Maintenance And Repair Manual page 13

MESSAGE (cont.)
Battery low (optional
battery)
PWR down and re-init
No course input (300
only)
COM failed
Stuck mic/TX disabled
Remote ENT key stuck
Remote XFR key stuck
Rcvr needs service
Battery rqrs service
(optional battery)
* Where multiple repair actions are listed, they are listed with most likely failure cause first.
RECOMMENDED REPAIR* (cont.)
IF battery/Charger pack not installed change
Configuration to: Remote Battery : None
If battery is installed verify that the charge is set up for
"auto" and allow to charge for 1 hr.
Verify Connections to remote battery/Charger pack.
Replace Remote battery pack.
Turn unit off and then back on again.
Verify connection between CPU Board and BPS receiver
board.
Replace GPS receiver (see Section 3.2.5)
Replace CPU board (see Section 3.2.4)
Verify connection to OBS
Replace CPU board (see Section 3.2.4)
Verify connection between CPU Board and Comm
Receiver Board
Replaced comm chassis sub-assembly (see Section 3.2.2)
Replace CPU Board (see Section 3.2.4)
Verify that mic key input to unit is not grounded
Verify connection between CPU Board and Comm
Receiver Board
Replace comm chassis sub-assembly (see Section 3.2.2)
Replace CPU board (see Section 3.2.4)
Verify that remote enter input to unit is not grounded
Verify connection between CPU Board and Comm
Receiver Board
Replace comm chassis sub-assembly (see Section 3.2.2)
Replace CPU Board. (see Section 3.2.4)
Verify that remote transfer input to unit is not
grounded
Verify connection between CPU Board and Comm
Receiver Board
Replace comm chassis sub-assembly (see Section 3.2.2)
Replace CPU Board (see Section 3.2.4)
Verify connection between CPU Board and GPS receiver
board.
Replace GPS receiver board (see Section 3.2.5)
Replace CPU Board (see Section 3.2.4)
If battery/charger pack not installed, change
configuration to remote battery: none
Verify connections to remote battery/charger pack
Replace remote battery pack
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