DATASONICS SIS-1500 System Manual page 96

5-14
The tow vehicle does not
respond to commands.
(Cont.)
Volume I System Manual
Table 5-2 Tow Vehicle Activation Problems
Symptom
The workstation is not
properly connected to the
digital multiplexer.
The modem on the
Multiplexer board in the digital
multiplexer or the Modem
board in the sonar electronics
has failed.
Possible Cause
DATASONICS
Corrective Action
Check the TELEM serial port
connections on the
workstation and the digital
multiplexer.
Observe the TELEM LOCK
LED indicator on the front
panel of the digital
multiplexer.
If the TELEM LOCK LED is
flashing:
Switch off the high voltage
power supply and the digital
multiplexer. Then, turn the
digital multiplexer and the
high voltage power supply
back on. The TELEM LOCK
LED should flash for about 30
seconds and then illuminate
continuously. If the TELEM
LOCK LED does not operate
properly, replace the
Multiplexer board in the digital
multiplexer. If the indicator
still does not operate
properly, replace the Modem
board in the sonar
electronics.
If the TELEM LOCK LED is
on:
Click Diagnostics in the Sonar
Controls box, and then select
the Console check box in the
Telemetry Output area of the
Sonar Diagnostics box. Verify
that the data displayed in the
Status display are
continuously updated and are
not garbled. If all the data are
garbled, replace the
Multiplexer board in the digital
multiplexer. If only the
command echo fields are
garbled, replace the Modem
board in the sonar
electronics.
June 1998