Tightening Sequence For Card Locks - Sun Microsystems SPARC Enterprise T5120 Installation And Service Manual

There are three types of locks:
Type A is a square-shaped lock. Three of these are supplied with each carrier.
■
Type B is an oblong lock that has an S-shaped profile. It provides a longer
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extension (0.75 in., 19 mm) than type A. Type B can be used as a top or side
mount, wherever a longer reach is needed. One of this type is included with each
carrier.
Type C is a small quarter-round lock. It can support the bottom edge of a wide PCI
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card, but only when the lock is at the far right side of its slot (the side farthest
from the front of the carrier). For a narrow width card, use this lock only to
support the side of the card. Do not use this lock to support the bottom edge of a
narrow width card because the lock might interfere with the card socket in the I/O
boat. This lock fits only the bottom slot on the carrier. One of this type is supplied
with each carrier.
One function of the locks is to secure the PCI card to the carrier. Another is to apply
a downward force to the top of the card to seat the card in the card socket when the
carrier is inserted into the I/O boat. In addition, the locks help prevent the card from
tilting so that card edge pins line up properly with the pins in the socket.
Because PCI card types are available in various sizes and shapes, you should choose
a combination of card locks that is best suited to the size and shape of the PCI card.
1.3.3

Tightening Sequence for Card Locks

To fasten a PCI card to a carrier so that the card will seat reliably, tighten the card
locks in the sequence shown in
PCI card shapes and sizes can vary, so use the following instructions as suggestions,
not as strict requirements.
If the PCI card is wide, use the tightening sequence shown in
■
card is one that can rest on the type C card lock (item 1 in
card lock is in its extreme right position.
If the PCI card is narrow, use the tightening sequence shown in
■
narrow card is one that is too short to rest on the type C card lock when the card
lock is in its extreme right position.
Caution – If you move the type C card lock out of the extreme right position while
the plastic part of the card lock is facing down, the PCI card will not seat properly,
and the bottom of the card lock can damage the PCI card socket in the I/O boat. If
you move the type C card lock to the left at any time, always rotate the card lock so
that the plastic part faces either left or right.
1-20 External I/O Expansion Unit Installation and Service Manual for SPARC Enterprise T5xxx Servers • April 2011
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