15 troubleshooting, Solving common problems – EXFO FOT-930 Multifunction Loss Tester User Manual
Page 89
Multifunction Loss Tester
81
15 Troubleshooting
Solving Common Problems
Problem
Possible Cause
Solution
The unit does not turn on.
You did not press
long enough.
AC adapter/charger not
connected.
Main batteries
discharged.
Weather too cold.
Press for 2 seconds.
Connect the AC
adapter/charger.
Charge batteries by
connecting the AC
adapter/charger.
The display is almost blank
at power-up.
Brightness may need some
adjustment.
Press
to adjust brightness
properly.
The date returns to
1900-01-01.
Clock battery is dead.
Replace the clock battery
Batteries do not charge as
expected.
Temperature is too
high.
Battery is incorrectly
connected.
Ensure temperature is
within specifications.
Ensure battery is
connected properly.
A battery status LED is
yellow.
Battery is defective.
Contact EXFO or replace the
battery.
During offset nulling, you
get the following message:
“Light detected during
nulling.”
Light reaches at least one
detector (power meter or
F
AS
T
ES
T).
Ensure protective caps are
tightly screwed on F
AS
T
ES
T
and power meter ports and
perform the nulling again.
Do not use rubber cover.
When using the power
meter, you get Power Too
Low or Power Too High.
Power of the signal
received at the power
meter port is outside its
measurement range.
Check the connections.
Ensure you use the proper
fiber and connector type and
that you use your power
meter within specifications.