Airspan AS4000, Installation Manual

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Printed Documentation
174
Circuit Board Assemblies
Circuit board assemblies must be individually boxed in Airspan-approved shipping
containers, to properly protect them from static electricity damage.
Static Control Rules
Airspan uses state-of-the-art semiconductors to obtain the fastest, most reliable operation.
These components are highly sensitive, and can be damaged by a static discharge as low
as 250V. Individuals may generate enough static to damage a component without noticing
the discharge, so must take precautions to control static.
Static Electricity Control
All sensitive Printed Circuit Boards (PCBs) must be handled at a static-safe work area.
The minimum requirement is a workbench with a grounded work surface, a grounded floor
mat, and a wrist strap. When a board is changed at the switch, a portable field service
grounding kit must be used.
Figure 1 shows the grounded workbench.
Figure 1. Printed Circuit Card Workstation
All boards must be transported in a static-shielding bag.
The following procedures reduce the possibility of static discharge damage:
a. Wearing a wrist strap while handling PCBs.
b. Attach the string of the Airspan Return and Repair Tag to the ejector/injector of the
PCB.
c. Insert PCBs into approved static shielding bags with repair tags remaining outside the
shielding bag. Do not insert repair tags into static shielding bags.
d. Pack/unpack PCBs at a static-safe workbench.
e. Transfer boards in a static-shielding bag or non-conductive board container.
f.
Properly ground storage shelves.
g. Properly ground personal wrist straps while transferring boards to the storage
shelves.
Shipping Boxes
WARNING: ; A box of boards must not contain other heavy items that could
cause part damage.
PCBs