Klein 3000 Series Troubleshooting Manual page 59

SYSTEM 3000 OPERATIONS AND MAINTENANCE MANUAL
The 200 VDC on the Multiplexer board also supplies 200VDC power to the
Transceiver boards. If the 200 volts is being pulled down on the Multiplexer board,
remove the two Transceiver boards and meter again.
The Data is coupled with the 200 VDC.
TP1 shows the data before it is coupled to the 200 volts.
Check this point if you have 200 VDC but no towfish activity. Info: these
measurements were made with a 30 meter test cable and a 3dB attenuator at the
input to the Demultiplexer board.
L-3 Klein Associates, Inc. TROUBLESHOOTING GUIDE 4-55