Instruction Manual

G1000 / GFC 700 System Maintenance Manual - 300/B300 Series King Air Page 5-55
190-00716-01 Revision 4
5.10 GIA 63 Troubleshooting
5.10.1 COM
Symptom Recommended Action
Weak COM transmit power
• Switch GIA1 and GIA2, to verify location of problem:
9 If problem follows unit, replace GIA.
9 If problem does not follow unit, check COM antenna and cabling for
faults.
Weak COM receiver
• Switch GIA1 and GIA2, to verify location of problem:
9 If problem follows unit, replace GIA.
9 If problem does not follow unit, check COM antenna and cabling for
faults.
No COM sidetone
• Switch GIA1 and GIA2, to verify location of problem:
9 If problem follows unit, replace GIA.
9 If problem persists, replace GMA1 with a known good unit.
9 If problem persists, reinstall original GMA1 and replace GMA2.
5.10.2 NAV
Symptom Recommended Action
Weak NAV receiver
• Set up a NAV/COM Ramp Test Set to radiate a test signal.
• Switch GIA1 and GIA2, to verify location of problem:
9 If problem follows unit, replace GIA.
9 If problem does not follow unit, check NAV antenna, coupler, and
cabling for faults.
5.10.3 G/S
Symptom Recommended Action
Weak G/S receiver
• Set up a NAV/COM Ramp Test Set to radiate a test signal.
• Switch GIA1 and GIA2, to verify location of problem:
9 If problem follows unit, replace GIA.
9 If problem does not follow unit, check NAV antenna, coupler, and
cabling for faults.