This information applies only to the
FTB-100 mini-OTDR and FTB-100B Mini-OTDR.
IMPORTANT NOTICE
Please make sure to fully charge the battery prior to using the
instrument for the first time.
Battery Maintenance Recommendations
➤ To extend the life of the 9 V clock battery, do not leave the main battery
in the unit when it is discharged.
➤ EXFO highly recommends removing the NiMH main battery and 9 V
clock battery if the unit will not be used for more than two weeks.
➤ EXFO recommends leaving the FTB-100/FTB-100B plugged in when
not in use.
➤ Replace the 9 V clock battery every 6 months to avoid having to
recalibrate the touchscreen.
➤ Change the Ni-MH main battery after 300 cycles (approximately
18 months of use) otherwise the unit operating time might be reduced
by as much as 50 %.
➤ If the NiMH main battery is not used for a long period of time (i.e. over
three months), it will not be damaged, but might need to be recharged.
In the worst case scenario, the battery will require a complete
recalibration; i.e. a full discharge, immediately followed by a full
charge, then followed by a full discharge.
DC0091A November 2001 1/3
Solutions to Common Problems
Problem Cause Solution
The unit does not
power up.
Unit screen
a
is dark
.
External keyboard is
not working.
Screen characters are
dim.
The battery pack is
discharged.
The FTB-100/FTB-100B
is not connected to an
external power supply.
The external power
supply is unplugged.
The FTB-100/FTB-100B
backlight is off.
External keyboard has
not been detected.
The Contrast and/or
Brightness control(s)
are not set properly.
➤ Charge the battery pack.
➤ Replace the battery pack with a
fully charged one.
➤ Connect the FTB-100/FTB-100B to
an external power supply using the
AC/DC adapter/charger.
➤ Connect the FTB-100/FTB-100B to
an external power supply using the
AC/DC adapter/charger.
➤ Make sure the external power
supply is plugged in at both ends.
➤ Press the Backlight button.
➤ Unplug the keyboard and then plug
it again.
➤ Turn off the FTB-100/FTB-100B,
plug in the keyboard, and turn on
the FTB-100/FTB-100B.
➤ Adjust the Contrast and Brightness
controls.
The battery indicator
remains low after a full
charge.
The battery is not
properly calibrated.
➤ Perform a complete battery
recalibration, i.e. a full discharge,
immediately followed by a full
charge.
The touchscreen
needs to be
The 9 V battery is too
low.
➤ Replace the 9 V battery.
recalibrated frequently.
You took longer than
one minute to replace
the main battery.
➤ Have your fully charged
replacement main battery on hand
before changing the discharged
one.
The unit operating
time is reduced.
DC0091A November 2001 2/3
The NiMH main battery
is probably worn-out.
The NiMH main battery
was not fully charged.
➤ Replace the NiMH main battery.
➤ Charge the NiMH main battery.
➤ Perform a complete battery
recalibration
b
.
Problem Cause Solution
The 9 V battery must
be replaced regularly.
When pressing the
PUSH button on the
battery, the LEDs do
not light up.
The performance of
the unit degrades
noticeably
OR
The “Storage capacity
The battery voltage is
below 5.8 V and the
NiMH main battery is
uncalibrated.
The internal flash ROM
has less than 512 KB of
free memory left.
➤ See. Battery Maintenance
Recommendations on page 1
➤ Perform a complete battery
recalibration
➤ Free up more memory in the
b
.
FTB-100/FTB-100B’s internal flash
ROM by deleting some stored trace
files or by transferring them to a PC
Card or floppy disk.
is low and may slow
down the operation of
the unit. Please delete
unnecessary
files”message is
displayed on-screen
upon startup.
a. The screen is only completely dark on the color LCD. On the monochrome LCD, you can always
distinguish the screen, even when the backlight is completely off.
b. A complete battery recalibration consists of a full discharge, immediately followed by a full charge, then
followed by a full discharge.
Note: If all the solutions mentioned above do not seem to work, make sure the
FTB-100/FTB-100B is turned off and cut all power sources (unplug the
power supply and remove the 9 V and main batteries) for 10 seconds.
Then, reinsert the batteries and power up the unit. If the problem persist,
call EXFO.
DC0091A November 2001 3/3
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