Setting Up For Testing The Electronics; Checking The Multiplexer Board; Figure C-23: Towfish Electronics Ready For Servicing - Klein 3000 Series Operation And Maintenance Manual

C.6.7 Setting up for Testing the Electronics
Remove the towfish electronics as described in "Removing the Towfish
Electronics" on page C-23 and place the electronics in a position so that you can
reconnect the transducers and cable. The towfish electronics is shown removed
and ready for servicing in Figure C-23.
Figure C-23:
C.6.8 Checking the Multiplexer Board
The Multiplexer board is shown in Figure C-21 on page C-25 and performs the
following functions:
• Receives the 200 VDC and telemetry from the surface and
separates out the telemetry from the 200 VDC.
• Routes the 200 VDC to the power supply, and then receives the
converted + 5 VDC and ±15 VDC.
• Routes the 200 VDC to the Transceiver boards.
• Generates ±5 VDC.
• Generates the time varied 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 the fiber-optic interface.
Towfish Electronics Ready for Servicing
C-27
Towfish