Greenlee 46054 Manual De Instrucciones página 12

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Using the Test Set for Troubleshooting Circuits
Some general troubleshooting procedures and tips are provided here. These procedures may
require other tools or equipment that are specific to the communications system installation
trade. For a complete selection of DSV (data-signal-voice) tools, please refer to a Greenlee
full-line catalog, a Greenlee DSV catalog, or visit our website at www.greenlee.textron.com.
Possible Cause /
Symptom*
Troubleshooting Step
Test set alarms Telephone wire
contacting a power
line
Cross-talk Split pair
Cross connection Direct wiring fault
Noise Hiss (white noise);
pulse dialing causes a
momentary change in
the sound of the noise
Popping, crackling
Momentary or impulse
noise
Power hum Cable imbalance
A long run of telephone
cable near a power line
Ground fault
* Water may cause most of these symptoms and may cause multiple symptoms to appear at
the same time.
12
Explanation
This is a potentially hazardous situation!
If the test set produces the excessive DC
voltage alarm (low pitch, low pitch, low pitch)
or the AC line voltage alarm (constant ringing),
remove the test set from the line carefully and
immediately!
A split pair (a circuit made up of wires from two
separate wire pairs) will be unbalanced and
prone to cross-talk.
Check for crossed pairs.
This is probably due to water in the cables.
The customer has an older carbon transmitter
type of telephone.
This may be due to an unbalanced cable, nearby
power switch gear, or similar equipment.
Break the circuit down into sections and check
each section for an imbalance.
Contact the local electric utility.
Check for the presence of voltage. If voltage is
present, measure the level. If it is typical line
voltage, contact the local electric utility.