Table 4-9 Operational Checks - Garmin GTN 725 Maintenance Manual

Problem
With power applied,
GTN does not
respond to input
from one or more of
the following:
• Touchscreen
• Audio volume
knob
• HOME key
• DIRECT-TO
key
• Dual concentric
knobs.
OBS indication on
GTN does not
agree with OBS
setting.
190-01007-01
Rev. 5

Table 4-9 Operational Checks

Possible Cause
Display head circuitry
malfunctioning.
GTN resolver or resolver
input not calibrated.
Corrective Action
Replace the GTN. Refer to section 5.1 for details.
• Calibrate the GTN resolver input.
• If the problem persists, replace the GTN.
Refer to section 5.1 for details.
GTN 725/750 Maintenance Manual
Page 4-10