Klein 3000 Series Troubleshooting Manual page 58

SYSTEM 3000 OPERATIONS AND MAINTENANCE MANUAL
Checking the Multiplexer Board
The Multiplexer board performs the following functions:
1
2
3
4
5
6
7
Checking 200 VDC
The towfish requires 200 volts DC from the TPU to operate. Using a volt meter check
for 200 vdc at the towfish connector of the TPU. Meter from the center pin to the side
of the connector. If you do not have 200 vdc here, check the towfish fuse on the TPU.
Next verify that the 200 VDC is reaching the towfish end of the tow cable. Meter
across pins 1 and 2 of the tow cable/towfish connector.
The 200 VDC enters the towfish and passes though the
feed-thru connector; it then enters the Multiplexer board on a
gold SMA connector. To check, unplug the connector and
meter from the center to the outside edge.
At the Multiplexer board the 200 VDC goes through L3, L4,
and L5 and exits the board at JP9. The 200 volts supplies
power to the low voltage power supply which then supplies
+5, +15, and -15 volts back to the Multiplexer board.
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Receives the 200 volts and telemetry from the surface;
separates the telemetry from the 200 volts DC.
Routes the 200 volts DC to the power supply, and then receives
the converted plus 5 volts DC, plus 15 volts DC, and minus 15
volts DC.
Routes the 200 volts DC to the Transmitter boards.
Generates plus and minus 5 volts DC.
Generates the Time Variable Gain (TVG) curves for the received
sonar signals from the transducers.
Multiplexes all the data channels and transmits the telemetry
back to the surface.
Provides fiber optic interface.
CAUTION
High Voltage - Do Not Short!
TROUBLESHOOTING GUIDE L-3 Klein Associates, Inc.