Teledyne 440, System Manual, Page: 171 / 256

9 – Maintenance
DPN 402196 Issue 4.1 © Teledyne TSS 9- 7
Remove the ‘Power/Comms’ end-cap:
NOTE
Note that this end-cap has two ports. Its correct orientation is for the 12-way port
to align with the SEP identification label.
1. Use the 3mm hexagonal key to release and remove the four M4 × 16mm A4 stainless-steel
screws that secure the end-cap to the housing.
2. Use the 2mm hexagonal key to remove the two grub-screws from the threaded holes near the
edge of the end-cap.
3. Insert two of the M4 × 16mm screws into the holes vacated by the grub-screws and tighten
them by hand until you feel resistance.
4. Use the 3mm hexagonal key to tighten the two M4 × 16mm screws alternately so that they lift
the end-cap away from the SEP housing.
5. After you have screwed the two jacking screws home, use your fingers to ease the end-cap
away from the SEP housing. Note that a partial vacuum may form inside the housing and this
may make it difficult to remove the end-cap.
Do not insert any hard or sharp instruments
into the gap to act as a lever because this may scratch the surface, following which cor-
rosion will occur
.
6. Remove the two jacking screws from the end-cap.
7. Do not allow strain to develop on the internal connectors as you ease the end-cap away from
the SEP housing. Disconnect the 12-way and the 6-way internal connectors by pressing their
two side-clips together and pulling the plugs and sockets apart.
8. Disconnect the ground strap by pulling the spade connector and receptacle apart.
Remove the coil connector end-cap:
NOTE
Note that this end-cap has four ports. Its correct orientation is for channels 1 and 2
to be at the top of the SEP.
9. Remove the four M4 × 16mm A4 stainless-steel screws as before. Substitute two of these
screws in place of the two grub screws to jack the end-cap away from the SEP housing.
Remove the jacking screws from the end-cap.
10. Remove the end-cap carefully – note that it carries all the circuit board assemblies. Handle this
assembly with care. Pull the end-cap carefully until the entire assembly is free of the SEP
housing and place it on the clean anti-static work surface. Save the pack of desiccant that is
wedged underneath the circuit-board assembly and store it in a warm dry place while you work
on the circuitry.
11. The Main Board is located on one side of the central support block, and the Driver Board and
the Analogue Board are located together on the other side.