F. Operator Troubleshooting
F.1. General Information
Use this troubleshooting guide when there is a problem with a CT100B or to assist with problem
identification. This will help you to determine if the instrument should be repaired or is acceptable
to continue using. Any time one of the internal thermal fuses actuates with an audible click,
indicating thermal overload, turn off the rear panel battery-disconnect switch immediately and
have the instrument serviced as soon as possible.
CAUTION: DO NOT continue using the CT100B if it exhibits signs of
thermal overload, such as emitting heat or smoke, or if it smells of burning
plastic.
F.2. Power On Test
Verify that the back switch is in the ON position. Press the front red button to turn the instrument
on. If the instrument does not show anything on the screen within 20 seconds, turn the back switch
to the OFF position, unplug all USB and Ethernet devices, and attempt to turn it on again.
F.3. Functional Block Diagram and Troubleshooting Flowcharts
Use the following functional block diagram and troubleshooting flowcharts for various parts of the
CT100B to determine if your CT100B requires service. See Parts List for a replaceable parts list.
CT100B TDR Cable Analyzers Operator’s Manual 129
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