User Manual

1pC (AS4000) Operations and Maintenance

Section

Fault Diagnostic Guide. 605-0000-441

. Issue 1.6 Date 26/8/98

Page 1 of 6 © Copyright Airspan Communications Corporation 1999

SECTION 8 EQUIPMENT RETURN FOR REPAIR

1. PACKING AND SHIPMENT

1.1. Circuit Board Assemblies

1.1.1. General

Circuit board assemblies must be individually boxed in ACC-approved shipping

containers to properly protect them from static electricity damage.

1.1.2. Static Control Rules

ACC uses state-of-the-art semiconductors to obtain the fastest, most reliable

operation. These new chips are more static sensitive than older Metal-Oxide

Semiconductor (MOS) parts. Some of the new parts can be damaged by a static

discharge as low as 250V. A person may generate enough static to damage a

part and never feel the discharge. Proper procedures must be followed to

control static.

1.1.3. 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 1-1

shows the grounded workbench.

COMMON GROUND POINT FOR

WRIST STRAP AND TABLE TOP

FLOOR MAT (3M #8200)

WRIST STRAP (3M #2066)

GROUND CORD

(3M #3040)

1 MEG

1 MEG GROUND

CORD (3M #3043)

TABLE MAT (3M #8210)

Figure 1-1. Printed Circuit Card Workstation

All boards must be transported in a static-shielding bag.