System Maintenance Manual

Page 5-56 G1000 / GFC 700 System Maintenance Manual - 200/B200 Series King Air
Revision 6 190-00915-01
5.11 GIA Alert Messages
5.11.1 COM Alerts
Failure Message Cause Solutions
COM1 SERVICE – COM1 needs
service. Return unit for repair.
The system has determined
COM1 needs service.
• Replace GIA1 according to
instructions in Section 6.
COM2 SERVICE – COM2 needs
service. Return unit for repair.
The system has determined
COM2 needs service.
• Replace GIA2 according to
instructions in Section 6.
COM1 PTT – COM1 push-to-talk
key is stuck.
The COM1 external push-to-talk
(PTT) switch is stuck in the
enabled (or “pressed”) state.
• Press the push-to-talk switch(s) again
to cycle its operation.
• Check push-to-talk switch(s) and
wiring.
• Check GIA1/GMA 1347D #1
interconnect.
• Switch GIA1 and GIA2, to identify
whether the unit or connectors/wiring
is at fault (Both GIAs must be
configured when swapped; see
Section 3.9):
9 If problem follows the unit,
replace GIA1.
9 If problem persists replace
defective GMA 1347D #1.
COM2 PTT – COM2 push-to-talk
key is stuck.
The COM2 external push-to-talk
(PTT) switch is stuck in the
enabled (or “pressed”) state.
• Press the push-to-talk switch(s) again
to cycle its operation.
• Check push-to-talk switch(s) and
wiring.
• Check GIA2/GMA 1347D #2
interconnect.
• Switch GIA1 and GIA2, to identify
whether the unit or connectors/wiring
is at fault (Both GIAs must be
configured when swapped, see
Section 3.9):
9 If problem follows the unit,
replace GIA2.
9 If problem persists replace
defective GMA 1347D #2.