Garmin 500W Series Instructions Manual page 12

Problem
OBS indication on
500W Series unit
does not agree with
OBS setting.
500W Series unit is
not receiving
heading from
compass system
(ARINC 429
heading input used)
RMI pointer does
not indicate correctly
Tuning data not
updating DME
ARINC 429 device
is not receiving data
from the
500W/530W.
RS-232 device is
not communicating
with the
500W/530W.
Fan Fail
Annunciation.
500W Series
Instructions for Continued Airworthiness Bell 206B
Possible Cause
 500W Series unit resolver input
not calibrated correctly.
 Resolver has not been
calibrated.
 ARINC 429 input port speed
not correct
 Wiring connections are
incorrect.
 Desired RMI source has not
been selected.
 Wiring connections are
incorrect.
 Incorrect configuration.
 Wiring connections are
incorrect.
 500W Series unit ARINC 429
output not configured correctly.
 ARINC 429 input port speed
not correct
 Wiring connections are
incorrect.
 500W Series unit RS-232 port
not configured correctly.
 Improper setup on the remote
device.
 Device not compatible, or
improper connection.
 Multiple TX lines connected
together.
 Wiring connections are
incorrect.
 Wiring connections are
incorrect.
 Fan has failed.
Solution

Check wiring and calibration.

Check ARINC 429 input port speed
setting for port that device is
connected to and verify that the
speed is correct for that device.

Check wiring.

Check the OBI source selection on
the Main CDI/OBS Config page.

Check wiring.

Check the DME Channel Mode on
the VOR/LOC/GS CDI page.

Check wiring.

Check ARINC 429 output port setting
for port that device is connected to.

Check ARINC 429 input port speed
setting for port that device is
connected to and verify that the
speed is correct for that device.

Check wiring.

Check RS-232 port setting for port
that device is connected to.

Verify the configuration of the other
device.

Verify 500W Series unit RX is
connected to remote device TX and
500W Series unit TX is connected to
remote device Rx.

Verify that there is only one TX
source per RX port.

Check wiring.

Check wiring.

Replace fan.
190-01226-03 Rev. 5
Page 12 of 23