EXFO FOT-930 - Service and Repairs

Troubleshooting
Multifunction Loss Tester 83
Solving Common Problems
Unable to establish FASTEST
communication.
 Remote unit’s FASTEST
port is in use.
 Remote unit is not
compatible.
 Selected port on master
unit differs from actual
port to which fiber is
connected.
 Compatibility set to
FOT-930 but remote
unit is not an FOT-930
or FTB-3930.
 Wait until FASTEST
completes, turn source
and ORL meter off or exit
Probe mode.
 Make sure remote unit is
an FOT-930, FTB-3930,
FOT-920 or FTB-3920.
 Set the port (SM or MM)
correctly in F
ASTEST Setup
on master unit.
 Set the compatibility to
FOT-920 in F
ASTEST Setup
on master unit.
During F
ASTEST, you get a
message saying that
loopback reference was
not performed.
Loopback reference was
selected, but not performed
(or reference is outdated).
Perform a loopback reference
before F
ASTEST measurement.
ORL values are inaccurate
for short fibers at 1310 nm
during a F
ASTEST.
— Measure ORL manually.
Unable to communicate
with an FOT-920 using the
talk set.
Talk sets of the FOT-920 and
FOT-930/FTB-3930 are not
compatible.
Use text messaging instead.
Unable to establish
connection with
compatible talk set.
Probe mode is activated on
remote unit (FOT-930 only).
Deactivate Probe mode.
Problem Possible Cause Solution