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9 – Maintenance
From CHART 3
Check internal wiring
from the 12-way QM
to all PCBs
Is
No
Repair or
wiring
renew wiring
good?
Yes
Disconnect 4-way Molex
from CN2 on Main PCB
2-wire
4-wire
current-loop
current-loop
Comms
Method?
Short CN2 pin 1 to pin 2
Short CN2 pin 3 to pin 4
on the Main PCB
on the Main PCB
LEDs
Yes
No
LEDs
D1 D3 D4
D1 D4
on?
on?
Yes
No
Check cable continuity
Renew the Main PCB
and repeat target scaling
Check communications
Yes
Comms
Re-assemble the SEP
OK?
No
Go to CHART 5
Figure 9-9: Communications failure – CHART 4
9-16
© Teledyne TSS
DPN 402196 Issue 4.1
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