L3 Comminications SERIES 5000 Operation And Maintenance Manual - page 252
of
283
Towfish
D-49
D.8.13 Checking the DSP Board
If you seem to be having data display problems, there may also be a subtle problem
in the DSP board. To check this, select the
Display test pattern #1
option on the
Towfish Diagnostics tab of the Sonar Interface dialog box and you should see a
clean cascading image as shown in Figure D-25.
Figure D-23:
Multiplexer Board Waveforms
TP4 Telemetry (TP 4,6,5)
TP6
TP5
TP9 should be low 0 volts
TP7 TVG curve