
350 Cable Survey System
DPN 402197 © TSS (International) Ltd Page 20 of 26
Figure 9–10: Communications failure – CHART 3
From CHART 2
Reconnect 12-way and
6-way connectors
Comms
method?
Short pins 1 & 2 on
Processor Board PL2
Short pins 3 & 4 on
Processor Board PL2
COMMS
OK?
Power-on the System
Check supply LEDs on
Power Supply Board
All
LEDs
on?
Check wiring and
supply voltages
Check internal wiring
to all boards
Is
wiring
OK?
Repair as necessary
Disconnect PL2
on Processor Board
LEDs
D1 D3 D4
on?
Check cable continuityChange Processor PCB
Reassemble the SEP
Contact TSS for advice
No
Yes
No
Yes
2-wire
current-loop
4-wire
current-loop
Yes
LEDs
D1 D4
on?
YesNo
No
Yes
No
Renew faulty board
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