Fastening Captive Screws; Fastening Termination Panels - Nortel Passport 15000 Hardware Installation And Maintenance

58 Chapter 2 Safety considerations and best practices

Fastening captive screws

Fastening termination panels

241-1501-240 5.2S2
Unless otherwise specified, all screws are unfastened counter-clockwise and
fastened clockwise. Some screws require a hand tool to fasten or unfasten
them (for example, an air filter cover).
CAUTION
Risk of equipment damage and service loss
Do not use any kind of power tool on a captive screw. The
screw is necessary to keep the card, module, or cover
properly seated. If the screw is overtightened (stripping it
or its hole), the hardware cannot operate correctly.
Most screws on Passport 15000 or 20000 plug-in field replaceable units
(FRUs) or service replaceable units (SRUs) are captive. A captive fastener
means the fastener stays attached to the unit after it is unfastened.
Do not use any kind of power tool on a captive screw. The screw is necessary
to keep the card, module, or cover properly seated. If the screw is
overtightened by stripping it or its hole:
• the hardware assembly that accommodates the unit will need to be
replaced (for example, a cooling unit for a fan controller or a BIP for a
BIM)
• the unit with the captive screw will need to be replaced (for example, a
fabric for its cover)
• if the unit or what it fastens to is not replaced, the hardware will not likely
operate correctly (for example, the reset button on a Passport 20000
fabric would not be engaged) and EMI containment is jeopardized
When fastening a fanout panel or a sparing panel to a Passport 7400 cabinet,
you will need EIA screws instead of the 10-mm (3/8-inch) screws that were
provided with the sparing panel.
When fastening a Passport 15000 or 20000 fanout panel or sparing panel to a
Passport 7400 cabinet (for example, an NTQS31), you must ground the panel
by fastening a No. 6 AWG (13.3 mm
2
) cable between the screw head and the