EXFO DC0091A User Manual

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

.