
9 – Maintenance
DPN 402197 © TSS (International) Ltd Page 13 of 26
Power Supply Board (see Figure 9–5):
1. Release and remove the insulating cover that protects the Power Supply board.
Unclip and release the 10-way connector. Unclip and release the 5-way connector
that is near the 2A fuse.
2. Use the 3mm hexagonal key to release the four M4 × 12mm screws that secure
the Power Supply board to the support block. Remove the Power Supply board.
Retain the four insulated spacers and all insulated inserts.
3. Check the 20mm 2A fastblow fuse on the Power Supply board and fit a new one if
it has failed. Investigate the cause of any repeated fuse failure.
4. Refit the board by reversing the above procedure. Make certain that you refit all
the insulated spacers and inserts when you reassemble the Power Supply board
to the support block. Refit the insulating cover over the Power Supply board.
Figure 9–5: Power Supply Board layout
CAUTION
Do not attempt to modify the Power Supply board so that it operates from an incorrect
electrical supply.
Reassemble the SEP:
1. Check the condition of the two rubber O-rings that seal each of the end-caps.
Clean or renew them if necessary. Apply a thin smear of approved lubricant to the
rings to ensure they make an efficient seal when you reassemble the SEP. For
this purpose, use the same type of lubricant that you use for the sub-sea
electrical connectors – refer to sub-section 4.1.2 for these important instruc-
tions.
2. Orientate the circuit board assemblies on the support block:
Place the empty SEP housing left-to-right in front of you. Make certain that the
short grounding lead inside the SEP housing is towards the right-hand end of the
housing. You must insert the coil connector end-cap into the housing from
the opposite end to the grounding lead.
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