
350 Cable Survey System
DPN 402197 © TSS (International) Ltd Page 18 of 26
9.3.2 Communications Failure
Figure 9–8: Communications failure – CHART 1
Communication
failure
Is SDC
COMMS
LED on?
Power-off the System.
Disconnect the SEP
Power/Comms cable
Continuity check the
cable and umbilical
Comms
OK?
LED or wiring failure.
Repair as necessary
Power-on the System
110V
±20%
OK?
Check the mains
power supply source
Power-off the System
Reconnect the SEP
Power/Comms cable
Go to CHART 2
Use terminal mode to
check SEP comms.
Yes
No
Yes
No
No
Yes
See sub-section 6.2.1.4
for terminal mode
Connect AC voltmeter
across pins 1 & 3
Look for 240V instead
if your SEP operates
from a 240V supply
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