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ST950 Plus+ User Manual
ST950 Plus+ User Manual
Page 141 of 176
667/HE/53000/000
Issue 2
Unrestricted
Replacement of Cabinet Mounted Cards
This section covers removal and fitting of cards in the ST950 Plus
+
cabinet. Also described are
procedures to ensure that the card functions correctly when fitted.
9.4.1
Safety Requirements
Equipment Replacement
Before replacing any fuses, cards etc., IT IS ESSENTIAL THAT THE POWER TO THE CONTROLLER
IS ISOLATED. See the Safety Warning on page 2 for details.
Failure to isolate the supply before changing parts may result in damage to the Controller.
The exception will be 48VDC PSU, if paired with redundancy units, and CIC units which are hot
pluggable. Replacement of CIC is likely to cause signals off so appropriate mitigations should
be put in place.
9.4.2
General Requirements
When replacing cards, the original card should be inspected and the following points checked:
•
Check the connectors on the card. Are any pins bent, broken or damaged in any way? If
there are, make a note of the card and pin number in the Controller Visit Logbook as the
backplane may have been damaged.
•
Check any ICs that are mounted in sockets and ensure they are securely fitted.
•
A problem with a loose-fitting IC or use of an incorrect one can usually be rectified easily
without having to fit a replacement card.
•
Do not forget to record the replacement in the Controller Visit Logbook.
•
Complete a fault label and return the faulty card for repair.
9.4.3
Access to Cards in ST950 Plus
+
19” Controller Rack
Most cards in the rack have connectors at their rear edge linked to various parts of the system. In
order to gain access to the rear of the cards, first swing out the ST950 Rack Assembly. Release this
by undoing the two screws at the right hand edge of the frame. Having done this there is room to
reach the back of the cards to deal with the ribbon cables.
The cards are held in the rack by retaining strips at the front, which must be moved clear after first
loosening the strip clamping screws.
Exercise care when withdrawing cards so as not to damage the ribbon cables as they pass across
the rear edge of the rack.
I/O cards are located on the back panel of the controller. The swing frame should be swung out of
the way first, then the I/O card(s) can be reached.
Intelligent Detector Backplane cards are fitted to the rear of the separate 3U detector rack.