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Polarity Check
Connect the TS120 Test Telephone to a powered wire
pair. Move the TALK/MONITOR switch to TALK and
press the POLAR key. The green LED will light if the red
test lead is connected to a more negative voltage than
the black test lead. The red LED will light if the red test
lead is connected to a more positive voltage than the
black lead.
Transmitter Mute
When using the TS120 Test Telephone in a noisy
environment, such as near a street with a lot of
automobile traffic, the ambient noise will enter the
TS120 Test Telephone's transmitter and a portion of the
noise will be sent to the receiver (side tone effect). This
noise may be loud enough in the receiver to make it
difficult to hear the person on the other end of the
telephone line. Press and hold the MUTE key to shut
off the transmitter, thus eliminating the ambient noise
and making it easier to hear the person at the other
end of the telephone line.
Receiving Calls
To receive an incoming call, put the TALK/MONITOR
switch in the MONITOR position. Incoming call signals
on the telephone line will cause the TS120 Test
Telephone to produce a ringing sound. To answer the
incoming call, move the TALK/MONITOR switch to the
TALK position.
Maintenance
WX
To avoid electric shock, disconnect the
alligator clips from any circuit before
performing maintenance. Read all
instructions carefully. Be aware of the
dangers that exist when maintenance is not
performed by an authorized service
technician.
Warning
W
Do not use CRC Cable Clean
chlorinated solvent on the TS120 Test
Telephone. Doing so will damage the test
telephone.
Belt Clip Replacement
See Figure 5.
The TS120's belt clip can be replaced by the user if it
becomes damaged or wears out. To obtain a
replacement belt clip, contact your local Fluke
Networks distributor and order part number P3218249.
To replace the belt clip assembly:
1
Using a Phillips screwdriver, remove the two screws
that secure the belt clip to the test telephone
housing.
2
Remove the old belt clip and replace with a new
one.
3
Secure the belt clip assembly to the test telephone
housing with the original screws. Be careful not to
over tighten the screws.
Figure 5. Replacing the Belt Clip
Line Cord Replacement
The line cord can be replaced by the user. To replace
the line cord refer to the instructions that come with
the replacement line cord. To obtain a replacement line
cord contact your local distributor or Fluke Networks
and order part number P3218636.
Maintenance
Caution
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